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Various small fixes.
[misc] / todo.py
diff --git a/todo.py b/todo.py
index 6cade91bf560fb45b42225631aa5cd9e5a089fee..a4d7da0e56fce598906e40ad42fd7a247d3934f7 100644 (file)
--- a/todo.py
+++ b/todo.py
@@ -3,199 +3,24 @@ import json
 from uuid import uuid4
 from datetime import datetime, timedelta
 from urllib.parse import parse_qs
-from jinja2 import Template
+from jinja2 import Environment as JinjaEnv, FileSystemLoader as JinjaFSLoader 
 from urllib.parse import urlparse
+from os.path import split as path_split
 db_path = '/home/plom/org/todo_new.json'
-# db_path = '/home/plom/public_repos/misc/todo_new.json'
 server_port = 8082
 DATE_FORMAT = '%Y-%m-%d'
-
-html_head = """
-<style>
-body { font-family: monospace; }
-table.alternating tr:nth-child(even) {
-    background-color: #f2f2f2;
-}
-table.alternating tr:nth-child(odd) {
-    background-color: #ffffff;
-}
-th, td { text-align: left; vertical_align: top; border-bottom: 1px dotted black; }
-td details { display: inline }
-td.input { width: 100%; }
-td.number { text-align: right; }
-td.checkbox { width: 0.1em; height: 0.1em; padding: 0em; text-align: center; }
-tr.week_row td { height: 0.1em; border: 0px; background-color: black; }
-tr.day_row td { background-color: #f2f2f2 }
-input { font-family: monospace; padding: 0em; margin: 0em; }
-input[type="number"] { font-family: monospace; text-align: right; }
-input[type="text"] { width: 100%; box-sizing: border-box; }
-</style>
-<body>
-tasks: <a href="{{db.prefix}}/tasks">list</a> <a href="{{db.prefix}}/add_task">add</a> | day:
-<a href="{{db.prefix}}/day?hide_unchosen=0&hide_done=0">choose tasks</a>
-<a href="{{db.prefix}}/day?hide_unchosen=1&hide_done=1">do tasks</a>
-| <a href="{{db.prefix}}/calendar">calendar</a>
-| <a href="{{db.prefix}}/unset_cookie">unset cookie</a>
-<hr />
-"""
-form_footer = '\n</form>'
-form_header_tmpl = """
-<form action="{{action|e}}" method="POST">
-"""
-calendar_tmpl = """
-<p>
-from: <input name="start" {% if start_date %}value="{{ start_date }}"{% endif %} placeholder="{{ today }}" />
-to: <input name="end" {% if end_date %}value="{{ end_date }}"{% endif %} placeholder="2030-12-31" />
-<input type="submit" value="OK" />
-</p>
-<table>
-{% for date, day in days.items() | sort() %}
-{% if day.weekday == "Mo" %}<tr class="week_row"><td colspan=3></td></tr>{% endif %}
-<tr class="day_row"><td colspan=3><a href="{{db.prefix}}/day?selected_date={{date}}&hide_unchosen=1">{{ day.weekday }} {{ date }}</a> |{{ '%04.1f' % day.todos_sum|round(2) }}| {{ day.comment|e }}</td></tr>
-{% for task, todo in day.todos.items() | sort(attribute='1.title', reverse=True)  %}
-{% if todo.visible %}
-<tr><td class="checkbox">{% if todo.done %}✓{% else %}&nbsp;&nbsp;{% endif %}</td><td><a href="{{db.prefix}}/todo?task={{ todo.task.id_ }}&date={{ date }}">{%if "cancelled" in todo.tags%}<s>{% endif %}{% if "deadline" in todo.tags %}DEADLINE: {% endif %}{{ todo.title|e }}{%if "cancelled" in todo.tags%}</s>{% endif %}</a></td><td>{{ todo.comment|e }}</td></tr>
-{% endif %}
-{% endfor %}
-{% endfor %}
-</table>
-"""
-todo_tmpl = """
-<h3>todo</h3>
-<input type="hidden" name="task_uuid" value="{{ todo.task.id_ }}" />
-<input type="hidden" name="date" value="{{ todo.day.date }}" />
-<table>
-<tr><th>task</th><td><a href="{{db.prefix}}/task?id={{ todo.task.id_ }}">{{ todo.task.title|e }}</a></td></tr>
-<tr><th>default weight</th><td>{{ todo.default_weight }}</td></tr>
-<tr><th>day</th><td>{{ todo.day.date }}</td></tr>
-<tr><th>day weight</th><td class="input"><input type="number" name="day_weight" step=0.1 size=8 value="{{ todo.day_weight }}" /></td></tr>
-<tr><th>comment</th><td class="input"><input type="text" name="comment" value="{{todo.comment|e}}" /></td></tr>
-<tr><th>done</th><td class="input"><input type="checkbox" name="done" {% if todo.done %}checked{% endif %}/></td></tr>
-<tr><th>day tags</th>
-<td>
-{% for tag in db.t_tags | sort %}
-{% if tag in todo.task.tags %}&nbsp;✓{% else %}<input type="checkbox" name="day_tag_{{tag|e}}"{% if tag in todo.day_tags %} checked{% endif %}/>{% endif %} {{ tag }}<br />
-{% endfor %}
-add: <input name="day_tags_joined" type="text" value="" >
-</td>
-</tr>
-</table>
-<input type="submit" value="update" />
-"""
-task_tmpl = """
-<h3>task</h3>
-<input type="hidden" name="id" value="{{ task.id_ }}" />
-<table>
-<tr><th>title</th><td class="input"><input name="title" type="text" value="{{ task.title|e }}" /><details><summary>history</summary><ul>{% for k,v in task.title_history.items() | sort(attribute='0', reverse=True) %}<li>{{ k }}: {{ v|e }}{% endfor %}</ul></details></td></tr>
-<tr><th>default weight</th><td class="input"><input type="number" name="default_weight" value="{{ task.default_weight }}" step=0.1 size=8 required /><details><summary>history</summary><ul>{% for k,v in task.default_weight_history.items() | sort(attribute='0', reverse=True) %}<li>{{ k }}: {{ v|e }}{% endfor %}</ul></details></td></tr>
-<tr><th>tags</th>
-<td>
-{% for tag in db.t_tags | sort %}
-<input type="checkbox" name="tag_{{tag|e}}"{% if tag in task.tags %} checked{% endif %}/> {{ tag }}<br />
-{% endfor %}
-add: <input name="tags_joined" type="text" value="" ><br />
-<details><summary>history</summary><ul>{% for k,v in task.tags_history.items() | sort(attribute='0', reverse=True) %}<li>{{ k }}: {{ v|e }}{% endfor %}</ul></details>
-</td></tr>
-</table>
-<input type="submit" value="update" />
-"""
-day_tmpl = """
-<p>
-<input name="hide_unchosen" type="checkbox" {% if db.hide_unchosen %}checked{% endif %} /> hide unchosen <input name="hide_done" type="checkbox" {% if db.hide_done %}checked{% endif %} /> hide done |
-<a href="{{db.prefix}}/day?selected_date={{prev_date}}">prev</a> <a href="{{db.prefix}}/day?selected_date={{next_date}}">next</a> |
-<input type="hidden" name="original_selected_date" value="{{ db.selected_date }}" />
-date: <input name="new_selected_date" value="{{ db.selected_date }}" size=10 /> |
-{{ db.selected_day.todos_sum|round(2) }} ({{ db.selected_day.todos_sum2|round(2)}}) |
-comment: <input name="day_comment" value="{{ db.selected_day.comment|e }}">
-</p>
-
-<table class="alternating">
-<tr><th>task</th><th class="checkbox">choose?</th><th class="checkbox">done?</th><th>weight</th><th>edit?</th><th>day tags</th><th>comment</th></tr>
-{% for uuid, t in db.tasks.items() | sort(attribute='1.title') %}
-{% if t.visible and (uuid not in db.selected_day.todos.keys() or db.selected_day.todos[uuid].visible) %}
-<tr>
-<input name="t_uuid" value="{{ uuid }}" type="hidden" >
-<td><details><summary>] <a href="{{db.prefix}}/task?id={{ uuid }}" />{{ t.current_title|e }}</a></summary>tags: {% for tag in t.tags | sort %}<a href="{{db.prefix}}/day?t_and={{tag|e}}">{{ tag }}</a> {% endfor %}</details></td>
-{% if uuid in db.selected_day.todos.keys() %}
-<td class="checkbox"><input name="choose" type="checkbox" value="{{ uuid }}" checked></td>
-<td class="checkbox"><input name="done" type="checkbox" value="{{ uuid }}" {% if db.selected_day.todos[uuid].done %}checked{% endif %}></td>
-<td class="checkbox"><input name="day_weight" type="number" step=0.1 size=8 value="{% if db.selected_day.todos[uuid].day_weight is not none %}{{ db.selected_day.todos[uuid].day_weight }}{% endif %}" placeholder={{ t.current_default_weight }} ></td>
-<td><a href="{{db.prefix}}/todo?task={{uuid}}&date={{ db.selected_date }}">edit</a></td>
-<td>{% for tag in db.selected_day.todos[uuid].day_tags | sort %}<a href="{{db.prefix}}/tags?t_and={{tag|e}}">{{ tag }}</a> {% endfor %}</td>
-<td>{{ db.selected_day.todos[uuid].comment|e }}</td>
-{% else %}
-<td class="checkbox"><input name="choose" type="checkbox" value="{{ uuid }}"</td>
-<td class="checkbox"><input name="done" type="checkbox" value="{{ uuid }}"></td>
-<td class="checkbox"><input name="day_weight" type="number" step=0.1 size=8 placeholder={{ t.current_default_weight }} ></td>
-<td></td>
-<td></td>
-<td></td>
-{% endif %}
-</tr>
-{% endif %}
-{% endfor %}
-</table>
-<input type="submit" value="OK">
-"""
-tag_filters_tmpl = """
-<p style="float: left; margin-right: 1em;">
-<input type="submit" value="OK">
-</p>
-<p>
-mandatory tags:
-{% for and_filter in db.t_filter_and %}
-<select name="t_and">
-<option></option>
-{% for tag in db.t_tags | sort %}
-<option value="{{tag|e}}" {% if and_filter == tag %}selected{% endif %}>{{tag|e}}</option>
-{% endfor %}
-</select>
-{% endfor %}
-<select name="t_and">
-<option></option>
-{% for tag in db.t_tags | sort %}
-<option value="{{tag|e}}">{{tag|e}}</option>
-{% endfor %}
-</select>
-<br />
-forbidden tags:
-{% for not_filter in db.t_filter_not %}
-<select name="t_not">
-<option></option>
-{% for tag in db.t_tags | sort %}
-<option value="{{tag|e}}" {% if not_filter == tag %}selected{% endif %}>{{tag|e}}</option>
-{% endfor %}
-</select>
-{% endfor %}
-<select name="t_not">
-<option></option>
-{% for tag in db.t_tags | sort %}
-<option value="{{tag|e}}">{{tag|e}}</option>
-{% endfor %}
-</select>
-</p>
-"""
-tasks_tmpl = """
-<table class="alternating">
-<tr><th>default<br />weight</th><th>task</th><th>tags</th></tr>
-{% for uuid, t in db.tasks.items() | sort(attribute='1.title') %}
-{% if t.visible %}
-<tr>
-<td class="number">{{ t.default_weight }}</a></td>
-<td><a href="{{db.prefix}}/task?id={{ uuid }}" />{{ t.title|e }}</a></td>
-<td>{% for tag in t.tags | sort %}<a href="{{db.prefix}}/tags?t_and={{tag|e}}">{{ tag }}</a> {% endfor %}</td>
-{% endif %}
-{% endfor %}
-</table>
-"""
+j2env = JinjaEnv(loader=JinjaFSLoader('todo_templates'))
 
 class Task:
 
-    def __init__(self, db, title_history=None, tags_history=None, default_weight_history=None):
+    def __init__(self, db, id_, title_history=None, tags_history=None, default_effort_history=None, links_history=None, comment=''):
+        self.id_ = id_
         self.db = db
         self.title_history = title_history if title_history else {}
         self.tags_history = tags_history if tags_history else {}
-        self.default_weight_history = default_weight_history if default_weight_history else {}
+        self.default_effort_history = default_effort_history if default_effort_history else {}
+        self.links_history = links_history if links_history else {}
+        self.comment = comment
         self.visible = True
 
     def _set_with_history(self, history, value):
@@ -208,32 +33,51 @@ class Task:
         return default if 0 == len(history) else history[keys[-1]]
 
     @classmethod
-    def from_dict(cls, db, d):
-        return cls(
-                db,
-                d['title_history'],
-                {k: set(v) for k, v in d['tags_history'].items()},
-                d['default_weight_history'])
+    def from_dict(cls, db, d, id_):
+        t = cls(
+               db,
+               id_,
+               d['title_history'],
+               {k: set(v) for k, v in d['tags_history'].items()},
+               d['default_effort_history'],
+               {k: set(v) for k, v in d['links_history'].items()},
+               d['comment'])
+        return t
+
+    def to_dict(self):
+        return {
+            'title_history': self.title_history,
+            'default_effort_history': self.default_effort_history,
+            'tags_history': {k: list(v) for k,v in self.tags_history.items()},
+            'links_history': {k: list(v) for k,v in self.links_history.items()},
+            'comment': self.comment,
+        }
 
     @property
-    def default_weight(self):
-        return self._last_of_history(self.default_weight_history, 1)
+    def default_effort(self):
+        return self._last_of_history(self.default_effort_history, 1)
 
-    @default_weight.setter
-    def default_weight(self, default_weight):
-        self._set_with_history(self.default_weight_history, default_weight)
+    @default_effort.setter
+    def default_effort(self, default_effort):
+        self._set_with_history(self.default_effort_history, default_effort)
 
-    def default_weight_at(self, queried_date):
-        ret = self.default_weight_history[sorted(self.default_weight_history.keys())[0]]
-        for date_key, default_weight in self.default_weight_history.items():
+    def default_effort_at(self, queried_date):
+        ret = self.default_effort_history[sorted(self.default_effort_history.keys())[0]]
+        for date_key, default_effort in self.default_effort_history.items():
             if date_key > f'{queried_date} 23:59:59':
                 break
-            ret = default_weight
+            ret = default_effort
         return ret
 
-    @property
-    def current_default_weight(self):
-        return self.default_weight_at(self.db.selected_date)
+    # @property
+    # def current_default_effort(self):
+    #     return self.default_effort_at(self.db.selected_date)
+
+    def matches(self, search):
+        if search is None:
+            return False
+        else:
+            return search in self.title or search in self.comment or search in '$'.join(self.tags) or search in self.title
 
     @property
     def title(self):
@@ -263,132 +107,270 @@ class Task:
     def tags(self, tags):
         self._set_with_history(self.tags_history, set(tags))
 
-    # @property
-    # def tags_joined(self):
-    #     return ';'.join(sorted(list(self.tags)))
-
-    # @tags_joined.setter
-    # def tags_joined(self, tags_string):
-    #     tags = set()
-    #     for tag in [tag.strip() for tag in tags_string.split(';') if tag.strip() != '']:
-    #         tags.add(tag)
-    #     self.tags = tags
+    @property
+    def links(self):
+        return self._last_of_history(self.links_history, set())
 
-    def to_dict(self):
-        return {
-            'title_history': self.title_history,
-            'tags_history': {k: list(v) for k,v in self.tags_history.items()},
-            'default_weight_history': self.default_weight_history}
+    @links.setter
+    def links(self, links):
+        self._set_with_history(self.links_history, set(links))
 
-    @property
-    def id_(self):
-        for k, v in self.db.tasks.items():
-            if v == self:
-                return k
+    @property
+    def id_(self):
+        for k, v in self.db.tasks.items():
+            if v == self:
+                return k
 
 
 class Day:
 
-    def __init__(self, db, todos=None, comment=''):
+    # def __init__(self, db, todos=None, comment='', date=None):
+    def __init__(self, db, date, comment=''):
+        self.date = date 
         self.db = db
-        self.todos = todos if todos else {}
         self.comment = comment
         self.archived = True
+        self.todos = {} # legacy
+        self.linked_todos_as_list = []
+        # if todos:
+        #     for id_, todo_dict in todos.items():
+        #         self.add_todo(id_, todo_dict)
 
     @classmethod
-    def from_dict(cls, db, d):
-        todos = {}
+    def from_dict(cls, db, d, date=None):
+        todos = {}
         comment = d['comment'] if 'comment' in d.keys() else ''
-        day = cls(db, todos, comment)
-        for uuid, todo_dict in d['todos'].items():
-            day.add_todo(uuid, todo_dict)
+        day = cls(db, date, comment)
+        # if 'todos' in d.keys():
+        #     for uuid, todo_dict in d['todos'].items():
+        #         day.add_todo(uuid, todo_dict)
+        # if 'linked_todos' in d.keys():
+        for id_ in d['linked_todos']:
+            # if id_ in day.linked_todos.keys():
+            #     continue
+            # if id_ is None:
+            #     continue
+            # linked_todo = db.todos[id_]
+            # linked_todo._day = day 
+            # day.linked_todos_as_list += [linked_todo]
+            day.linked_todos_as_list += [db.todos[id_]]
         return day
 
     def to_dict(self):
-        d = {'comment': self.comment, 'todos': {}}
-        for task_uuid, todo in self.todos.items():
-            d['todos'][task_uuid] = todo.to_dict()
+        d = {'comment': self.comment, 'linked_todos': []}
+        for todo_id in self.linked_todos.keys():
+            d['linked_todos'] += [todo_id]
+        # for task_uuid, todo in self.todos.items():
+        # for id_, todo in self.todos.items():
+        # #     d['todos'][task_uuid] = todo.to_dict()
+        #     new_type_todo_id = f'{self.date}_{task_uuid}'
+        #     if not new_type_todo_id in d['linked_todos']:
+        #         # d['linked_todos'] += [todo.id_] 
+        #         d['linked_todos'] += [new_type_todo_id] 
         return d
 
-    def add_todo(self, id_, dict_source=None):
-        self.todos[id_] = Todo.from_dict(self, dict_source) if dict_source else Todo(self)
-        return self.todos[id_]
+    # def add_todo(self, task_id, dict_source=None):
+    #     new_type_todo_id = f'{self.date}_{task_id}'
+    #     task = self.db.tasks[task_id]
+    #     if new_type_todo_id in self.db.todos.keys():
+    #         todo = self.db.todos[new_type_todo_id]
+    #     # elif task_id in self.db.keys():
+    #     #     todo = self.db.todos[task_id]
+    #     else:
+    #         # todo = Todo.from_dict(self.db, dict_source, id_=new_type_todo_id) if dict_source else Todo(db=self.db, day=self)
+    #         todo = Todo.from_dict(self.db, dict_source)
+    #     # todo._id = new_type_todo_id
+    #     todo._task = self.db.tasks[task_id] 
+    #     todo._id = new_type_todo_id
+    #     todo._day = self 
+    #     # self.todos[task_id] = todo 
+    #     self.linked_todos_as_list += [todo]
+    #     self.db.todos[new_type_todo_id] = todo
+    #     # self.db.todos[todo.task_id] = [todo]
+    #     # self.db.todos_as_list += [todo]
+    #     # self.db.all_todos[todo.task_id] = todo
+    #     return todo 
+
+    @property
+    def linked_todos(self):
+        linked_todos = {}
+        for todo in self.linked_todos_as_list:
+            linked_todos[todo.id_] = todo
+        return linked_todos
 
     def _todos_sum(self, include_undone=False):
         s = 0
-        for todo in [todo for todo in self.todos.values() if todo.done]:
-            s += todo.weight
-        if include_undone:
-            for todo in [todo for todo in self.todos.values() if not todo.done]:
-                s += todo.day_weight if todo.day_weight else 0
+        for todo in [todo for todo in self.linked_todos.values()
+                     if self.date in todo.efforts.keys()]:
+            day_effort = todo.efforts[self.date]
+            if todo.done:
+                s += day_effort if day_effort else todo.task.default_effort_at(self.date)
+            elif include_undone:
+                s += day_effort if day_effort else 0 
         return s
 
     @property
     def todos_sum(self):
         return self._todos_sum()
 
-    @property
-    def todos_sum2(self):
-        return self._todos_sum(True)
+    # @property
+    # def todos_sum2(self):
+    #     return self._todos_sum(True)
+
+    # @property
+    # def date(self):
+    #     if self._date:
+    #         return self._date
+    #     else:
+    #         for k, v in self.db.days.items():
+    #             # print("DEBUG date", k, v)
+    #             if v == self:
+    #                 return k
+    #     print("DEBUG FAIL", self.test_date, self)
 
-    @property
-    def date(self):
-        for k, v in self.db.days.items():
-            if v == self:
-                return k
 
 class Todo:
 
-    def __init__(self, day, done=False, day_weight=None, comment='', day_tags=None):
-        self.day = day
+    # def __init__(self, db, id_, task, done=False, day_effort=None, comment='', day_tags=None, importance=1.0, efforts=None):
+    def __init__(self, db, id_, task, done=False, comment='', day_tags=None, importance=1.0, efforts=None, children=None):
+        self.id_ = id_
+        self.db = db 
+        self.task = task 
         self.done = done
-        self.day_weight = day_weight
+        # self.day_effort = day_effort
+        self.efforts = efforts if efforts else {}
         self.comment = comment
         self.day_tags = day_tags if day_tags else set()
+        self.importance = importance
+        self.children = children if children else [] 
+        self.parent = None 
 
     @classmethod
-    def from_dict(cls, day, d):
-        return cls(day, d['done'], d['day_weight'], d['comment'], set(d['day_tags']))
+    def from_dict(cls, db, d, id_):
+        # todo = cls(db, None, None, d['done'], d['day_effort'], d['comment'], set(d['day_tags']), d['importance'])
+        # todo._task = db.tasks[d['task']] if 'task' in d.keys() else None
+        # todo._efforts = d['efforts'] if 'efforts' in d.keys() else None
+        # todo = cls(db, id_, db.tasks[d['task']], d['done'], d['day_effort'], d['comment'], set(d['day_tags']), d['importance'], d['efforts'])
+        todo = cls(db, id_, db.tasks[d['task']], d['done'], d['comment'], set(d['day_tags']), d['importance'], d['efforts'])
+        if 'children' in d:
+            todo.children = d['children']
+        return todo
+
+    # @classmethod
+    # def OLD_from_dict(cls, day, d):
+    #     todo = cls(day, d['done'], d['day_effort'], d['comment'], set(d['day_tags']), d['importance'])
+    #     if 'efforts' in d.keys():
+    #         todo._efforts = d['efforts']
+    #     return todo
 
     def to_dict(self):
-        return {'done': self.done, 'day_weight': self.day_weight, 'comment': self.comment, 'day_tags': list(self.day_tags)}
+        # return {'task': self.task.id_, 'done': self.done, 'day_effort': self.day_effort, 'comment': self.comment, 'day_tags': list(self.day_tags), 'importance': self.importance, 'efforts': self.efforts}
+        return {'task': self.task.id_, 'done': self.done, 'comment': self.comment, 'day_tags': list(self.day_tags), 'importance': self.importance, 'efforts': self.efforts, 'children': self.children}
 
     @property
-    def default_weight(self):
-        return self.task.default_weight_at(self.day.date)
+    def default_effort(self):
+        return self.task.default_effort_at(self.sorted_effort_dates[0])
 
-    @property
-    def weight(self):
-        if self.day_weight:
-            return self.day_weight
-        else:
-            return self.day_weight if self.day_weight else self.default_weight
+    # @property
+    # def effort(self):
+    #     if self.day_effort:
+    #         return self.day_effort
+    #     else:
+    #         return self.day_effort if self.day_effort else self.default_effort
+
+    # @property
+    # def task(self):
+    #     if self._task:
+    #         return self._task
+    #     # else:
+    #     #     for k, v in self.day.todos.items():
+    #     #         if v == self:
+    #     #             return self.db.tasks[k]
+
+    def is_effort_removable(self, date):
+        if not date in self.efforts.keys():
+            return False
+        # if len(self.efforts) == 1:
+        #     return False
+        if self.efforts[date]:
+            return False
+        if self.done and date == self.sorted_effort_dates[-1]:
+            return False
+        return True
 
     @property
-    def task(self):
-        for k, v in self.day.todos.items():
-            if v == self:
-                return self.day.db.tasks[k]
+    def total_effort(self):
+        total = 0
+        for effort in self.efforts.values():
+            total += effort if effort else 0
+        if self.done:
+            total = max(total, self.task.default_effort_at(self.sorted_effort_dates[-1]))
+        return total
+
+    def matches(self, search):
+        if search is None:
+            return False
+        else:
+            return search in self.comment or search in '$'.join(self.tags) or search in self.title
 
     @property
     def title(self):
-        return self.task.title_at(self.day.date)
+        return self.task.title_at(self.sorted_effort_dates[0])
 
-    # @property
-    # def day_tags_joined(self):
-    #     return ';'.join(sorted(list(self.day_tags)))
-
-    # @day_tags_joined.setter
-    # def day_tags_joined(self, tags_string):
-    #     tags = set()
-    #     for tag in [tag.strip() for tag in tags_string.split(';') if tag.strip() != '']:
-    #         tags.add(tag)
-    #     self.day_tags = tags
+    @property
+    def path(self):
+        path = ''
+        if self.parent:
+            path = f'{self.parent.path}{self.parent.title}:'
+        return path
 
     @property
     def tags(self):
         return self.day_tags | self.task.tags
 
+    # def internals_empty(self):
+    #     return len(self.comment) == 0 and len(self.day_tags) == 0
+
+    # def ensure_day_efforts_table(self):
+    #     # We don't do this yet at __init__ because self.day.date is unknown, since Todo may be imported with Day, and during the import process the Day is not yet keyed in TodoDB.days.
+    #     if not hasattr(self, '_efforts'):
+    #         self._efforts = {} # {self.day.date: self.day_effort}
+
+    # def set_day_effort(self, date, effort):
+    #     self.ensure_day_efforts_table()
+    #     self._efforts[date] = self.day_effort
+
+    @property
+    def day_effort(self):
+        return self.efforts[self.db.selected_date]
+
+    @property
+    def sorted_effort_dates(self):
+        dates = list(self.efforts.keys())
+        dates.sort()
+        return dates
+
+    @property
+    def day(self):
+        if len(self.efforts) == 0:
+            return None
+        todo_start_date = self.sorted_effort_dates[0]
+        return self.db.days[todo_start_date]
+
+    # @property
+    # def efforts(self):
+    #     self.ensure_day_efforts_table()
+    #     return self._efforts
+
+    # @property
+    # def id_(self):
+    #     if self._id:
+    #         return self._id
+    #     for k, v in self.db.todos.items():
+    #         if v == self:
+    #             return k
+    #     # return f'{self.day.date}_{self.task.id_}'
+
 
 class TodoDB(PlomDB):
 
@@ -402,20 +384,51 @@ class TodoDB(PlomDB):
         self.days = {}
         self.tasks = {}
         self.t_tags = set()
+        self.todos = {}
         super().__init__(db_path)
 
     def read_db_file(self, f):
         d = json.load(f)
-        for date, day_dict in d['days'].items():
-            self.days[date] = self.add_day(dict_source=day_dict)
-        for day in self.days.values():
-            for todo in day.todos.values():
-                for tag in todo.day_tags:
-                    self.t_tags.add(tag)
-        for uuid, t_dict in d['tasks'].items():
-            t = self.add_task(id_=uuid, dict_source=t_dict)
+        for id_, t_dict in d['tasks'].items():
+            t = self.add_task(id_=id_, dict_source=t_dict)
             for tag in t.tags:
                 self.t_tags.add(tag)
+        # if 'todos' in d.keys():
+        for id_, todo_dict in d['todos'].items():
+            # todo = Todo.from_dict(self, todo_dict, id_)
+            # todo._id = id_ 
+            # self.todos[id_] = todo
+            todo = self.add_todo(todo_dict, id_) # Todo.from_dict(self, todo_dict, id_)
+            self.todos[id_] = todo 
+            for tag in todo.day_tags:
+                self.t_tags.add(tag)
+        for date, day_dict in d['days'].items():
+            self.add_day(dict_source=day_dict, date=date)
+        for todo in self.todos.values():
+            for child_id in todo.children:
+                self.todos[child_id].parent = todo
+            # if len(todo.efforts) == 0:
+            #     print("DEBUG", todo.id_, todo.task.title, todo.efforts)
+            for date in todo.efforts.keys():
+                if not date in self.days.keys():
+                    self.add_day(date)
+                if not todo in self.days[date].linked_todos_as_list:
+                    self.days[date].linked_todos_as_list += [todo]
+                    # print("DEBUG", todo.title, date)
+                # if type(todo.efforts[date]) == str:
+                #     todo.efforts[date] = float(todo.efforts[date])
+                #     print("DEBUG", todo.title, date, todo.efforts[date])
+        # for todo in self.todos.values():
+        # for day in self.days.values():
+        #     for todo in day.todos.values():
+        #         for tag in todo.day_tags:
+        #             self.t_tags.add(tag)
+        # delete = None
+        # for todo in self.todos.values():
+        #     if len(todo.efforts) == 0:
+        #         print("DEBUG", todo.task.title)
+        #         delete = todo.id_ 
+        # self.delete_todo(delete)
         self.set_visibilities()
 
     def set_visibilities(self):
@@ -423,131 +436,380 @@ class TodoDB(PlomDB):
             t.visible = len([tag for tag in self.t_filter_and if not tag in t.tags]) == 0\
                     and len([tag for tag in self.t_filter_not if tag in t.tags]) == 0\
                     and ((not self.hide_unchosen) or uuid in self.selected_day.todos.keys())
-        for day in self.days.values():
-            for todo in day.todos.values():
-                todo.visible = len([tag for tag in self.t_filter_and if not tag in todo.day_tags | todo.task.tags ]) == 0\
-                    and len([tag for tag in self.t_filter_not if tag in todo.day_tags | todo.task.tags ]) == 0\
-                    and ((not self.hide_done) or (not todo.done))
+        # for day in self.days.values():
+        #     for todo in day.todos.values():
+        #         todo.visible = len([tag for tag in self.t_filter_and if not tag in todo.day_tags | todo.task.tags ]) == 0\
+        #             and len([tag for tag in self.t_filter_not if tag in todo.day_tags | todo.task.tags ]) == 0\
+        #             and ((not self.hide_done) or (not todo.done))
+        for todo in self.todos.values():
+            todo.visible = len([tag for tag in self.t_filter_and if not tag in todo.day_tags | todo.task.tags ]) == 0\
+                and len([tag for tag in self.t_filter_not if tag in todo.day_tags | todo.task.tags ]) == 0\
+                and ((not self.hide_done) or (not todo.done))
 
     def to_dict(self):
-        d = {
-                't_filter_and': self.t_filter_and,
-                't_filter_not': self.t_filter_not,
-                'tasks': {},
-                'days': {}
-        }
+        d = {'tasks': {}, 'days': {}, 'todos': {}}
         for uuid, t in self.tasks.items():
              d['tasks'][uuid] = t.to_dict()
         for date, day in self.days.items():
             d['days'][date] = day.to_dict()
+            for todo in day.todos.values():
+                d['todos'][todo.id_] = todo.to_dict()
+        for id_, todo in self.todos.items():
+            d['todos'][id_] = todo.to_dict()
         return d
 
+    # @property
+    # def all_todos(self):
+    #     todos = {}
+    #     for todo in self.todos_as_list:
+    #         todos[todo.id_] = todo
+    #     return todos 
+
     @property
     def selected_day(self):
         if not self.selected_date in self.days.keys():
-            self.days[self.selected_date] = self.add_day()
+            self.days[self.selected_date] = self.add_day(date=self.selected_date)
+            # print("DEBUG selected_day", self.days[self.selected_date].date)
         return self.days[self.selected_date]
 
-    def change_selected_days_date(self, new_date):
-        if new_date in self.days.keys():
-            raise PlomException('cannot use same date twice')
-        else:
-            self.days[new_date] = self.selected_day
-            del self.days[self.selected_date]
-            self.selected_date = new_date
-
     def write(self):
         dates_to_purge = []
         for date, day in self.days.items():
-            if len(day.todos) == 0 and len(day.comment) == 0:
+            if len(day.linked_todos) == 0 and len(day.comment) == 0:
                 dates_to_purge += [date]
         for date in dates_to_purge:
             del self.days[date]
         self.write_text_to_db(json.dumps(self.to_dict()))
 
     def add_task(self, id_=None, dict_source=None, return_id=False):
-        t = Task.from_dict(self, dict_source) if dict_source else Task(self)
         id_ = id_ if id_ else str(uuid4())
+        t = Task.from_dict(self, dict_source, id_) if dict_source else Task(self, id_)
         self.tasks[id_] = t
         if return_id:
             return id_, t
         else:
             return t
 
-    def add_day(self, dict_source=None):
-        return Day.from_dict(self, dict_source) if dict_source else Day(self)
+    def add_todo(self, todo_dict=None, id_=None, task=None, efforts=None):
+        id_ = id_ if id_ else str(uuid4())
+        if todo_dict:
+            todo = Todo.from_dict(self, todo_dict, id_)
+        elif task and efforts:
+            todo = Todo(self, id_, task, efforts=efforts)
+            children = []
+            for child_id in task.links:
+                child_task = self.tasks[child_id]
+                children += [self.add_todo(task=child_task, efforts=efforts)]
+            todo.children = [child.id_ for child in children]
+        self.todos[id_] = todo 
+        return todo
+
+    def add_day(self, date, dict_source=None):
+        day = Day.from_dict(self, dict_source, date) if dict_source else Day(self, date)
+        self.days[date] = day 
+        return day
 
-    def show_day(self):
+    # def show_day(self, task_sort=None):
+    #     task_sort = task_sort if task_sort else 'title' 
+    #     current_date = datetime.strptime(self.selected_date, DATE_FORMAT)
+    #     prev_date = current_date - timedelta(days=1)
+    #     prev_date_str = prev_date.strftime(DATE_FORMAT)
+    #     next_date = current_date + timedelta(days=1)
+    #     next_date_str = next_date.strftime(DATE_FORMAT)
+    #     task_rows = []
+    #     for uuid, task in self.tasks.items():
+    #         if not task.visible:
+    #             continue
+    #         todo = None
+    #         if uuid in self.selected_day.todos.keys():
+    #             todo = self.selected_day.todos[uuid]
+    #             if not todo.visible:
+    #                 continue
+    #         task_rows += [{'uuid': uuid, 'task': task, 'todo': todo}] 
+    #     if task_sort == 'title':
+    #         task_rows.sort(key=lambda r: r['task'].title)
+    #     elif task_sort == 'default_effort':
+    #         task_rows.sort(key=lambda r: r['task'].default_effort, reverse=True)
+    #     elif task_sort == 'done':
+    #         task_rows.sort(key=lambda r: 0 if not r['todo'] else r['todo'].day_effort if r['todo'].day_effort else r['task'].default_effort if r['todo'].done else 0, reverse=True)
+    #     elif task_sort == 'importance':
+    #         task_rows.sort(key=lambda r: 0.0 if not r['todo'] else r['todo'].importance, reverse=True)
+    #     elif task_sort == 'chosen':
+    #         task_rows.sort(key=lambda r: False if not r['todo'] else True, reverse=True)
+    #     elif task_sort == 'comment':
+    #         task_rows.sort(key=lambda r: '' if not r['todo'] else r['todo'].comment, reverse=True)
+    #     done_tasks = []
+    #     for uuid, task in self.tasks.items():
+    #         if uuid in self.selected_day.todos.keys():
+    #             todo = self.selected_day.todos[uuid]
+    #             if todo.done:
+    #                 done_tasks += [todo]
+    #     done_tasks.sort(key=lambda t: t.effort, reverse=True)
+    #     return j2env.get_template('day.html').render(db=self, action=self.prefix+'/day', prev_date=prev_date_str, next_date=next_date_str, task_rows=task_rows, sort=task_sort, done_tasks=done_tasks)
+
+    def neighbor_dates(self):
         current_date = datetime.strptime(self.selected_date, DATE_FORMAT)
         prev_date = current_date - timedelta(days=1)
         prev_date_str = prev_date.strftime(DATE_FORMAT)
         next_date = current_date + timedelta(days=1)
         next_date_str = next_date.strftime(DATE_FORMAT)
-        return Template(form_header_tmpl + tag_filters_tmpl + day_tmpl + form_footer).render(db=self, action=self.prefix+'/day', prev_date=prev_date_str, next_date=next_date_str)
+        return prev_date_str, next_date_str
+
+    def show_do_day(self, sort_order=None):
+        prev_date_str, next_date_str = self.neighbor_dates()
+        todos = [t for t in self.selected_day.linked_todos_as_list if t.visible]
+        if sort_order == 'title':
+            todos.sort(key=lambda t: t.task.title)
+        elif sort_order == 'done':
+            todos.sort(key=lambda t: t.day_effort if t.day_effort else t.default_effort if t.done else 0, reverse=True)
+        elif sort_order == 'default_effort':
+            todos.sort(key=lambda t: t.default_effort, reverse=True)
+        elif sort_order == 'importance':
+            todos.sort(key=lambda t: t.importance, reverse=True)
+        return j2env.get_template('do_day.html').render(
+                day=self.selected_day,
+                tags=self.t_tags,
+                filter_and=self.t_filter_and,
+                filter_not=self.t_filter_not,
+                prev_date=prev_date_str,
+                next_date=next_date_str,
+                todos=todos,
+                sort=sort_order,
+                hide_done=self.hide_done)
 
     def show_calendar(self, start_date_str, end_date_str):
         self.t_filter_and = ['calendar']
         self.t_filter_not = ['deleted']
         self.set_visibilities()
         days_to_show = {}
-        todays_date = str(datetime.now())[:10]
-        target_start_str = start_date_str if start_date_str else sorted(self.days.keys())[0]
-        target_start = todays_date if target_start_str == 'today' else target_start_str
-        target_end_str = end_date_str if end_date_str else sorted(self.days.keys())[-1]
-        target_end = todays_date if target_end_str == 'today' else target_end_str
-        start_date = datetime.strptime(target_start, DATE_FORMAT)
-        end_date = datetime.strptime(target_end, DATE_FORMAT)
-        for n in range(int((end_date - start_date).days) + 1):
-            current_date_obj = start_date + timedelta(n)
-            current_date = current_date_obj.strftime(DATE_FORMAT)
-            if current_date not in self.days.keys():
-                days_to_show[current_date] = self.add_day()
+        todays_date_str = str(datetime.now())[:10]
+        todays_date_obj = datetime.strptime(todays_date_str, DATE_FORMAT) 
+        yesterdays_date_obj = todays_date_obj - timedelta(1)
+        yesterdays_date_str = yesterdays_date_obj.strftime(DATE_FORMAT) 
+        start_date_obj = datetime.strptime(sorted(self.days.keys())[0], DATE_FORMAT)
+        if start_date_str and len(start_date_str) > 0:
+            if start_date_str in {'today', 'yesterday'}:
+                start_date_obj = todays_date_obj if start_date_str == 'today' else yesterdays_date_obj
             else:
-                days_to_show[current_date] = self.days[current_date]
-            days_to_show[current_date].weekday = datetime.strptime(current_date, DATE_FORMAT).strftime('%A')[:2]
-        return Template(form_header_tmpl + calendar_tmpl + form_footer).render(db=self, days=days_to_show, action=self.prefix+'/calendar', today=str(datetime.now())[:10], start_date=start_date_str, end_date=end_date_str)
-
-    def show_todo(self, task_uuid, selected_date):
-        todo = self.days[selected_date].todos[task_uuid]
-        return Template(form_header_tmpl + todo_tmpl + form_footer).render(db=self, todo=todo, action=self.prefix+'/todo')
-
-    def update_todo_mini(self, task_uuid, date, day_weight, done):
-        if task_uuid in self.days[date].todos.keys():
-            todo = self.days[date].todos[task_uuid]
-        else:
-            todo = self.days[date].add_todo(task_uuid)
-        todo.day_weight = float(day_weight) if len(day_weight) > 0 else None
-        todo.done = done
-        return todo
-
-    def update_todo(self, task_uuid, date, day_weight, done, comment, day_tags_joined, day_tags_checked):
-        todo = self.update_todo_mini(task_uuid, date, day_weight, done)
-        todo.comment = comment
-        day_tags = set()
-        for tag in [tag.strip() for tag in day_tags_joined.split(';') if tag.strip() != '']:
-            day_tags.add(tag)
-        for tag in day_tags_checked:
-            day_tags.add(tag)
-        todo.day_tags = day_tags
-
-    def show_task(self, id_):
-        task = self.tasks[id_] if id_ else self.add_task()
-        return Template(form_header_tmpl + task_tmpl + form_footer).render(db=self, task=task, action=self.prefix+'/task')
-
-    def update_task(self, id_, title, default_weight, tags_joined, tags_checked):
-        task = self.tasks[id_] if id_ in self.tasks.keys() else self.add_task(id_)
-        task.title = title
-        task.default_weight = float(default_weight) if len(default_weight) > 0 else None
+                start_date_obj = datetime.strptime(start_date_str, DATE_FORMAT)
+        end_date_obj = datetime.strptime(sorted(self.days.keys())[-1], DATE_FORMAT)
+        if end_date_str and len(end_date_str) > 0:
+            if end_date_str in {'today', 'yesterday'}:
+                end_date_obj = todays_date_obj if end_date_str == 'today' else yesterdays_date_obj
+            else:
+                end_date_obj = datetime.strptime(end_date_str, DATE_FORMAT)
+        for n in range(int((end_date_obj - start_date_obj).days) + 1):
+            current_date_obj = start_date_obj + timedelta(n)
+            current_date_str = current_date_obj.strftime(DATE_FORMAT)
+            if current_date_str not in self.days.keys():
+                days_to_show[current_date_str] = self.add_day(current_date_str)
+            else:
+                days_to_show[current_date_str] = self.days[current_date_str]
+            days_to_show[current_date_str].weekday = datetime.strptime(current_date_str, DATE_FORMAT).strftime('%A')[:2]
+        return j2env.get_template('calendar.html').render(db=self, days=days_to_show, action=self.prefix+'/calendar', start_date=start_date_str, end_date=end_date_str)
+
+    def show_todo(self, id_, return_to):
+        todo = self.todos[id_]
+        # if selected_date not in self.days.keys():
+        #     self.days[selected_date] = self.add_day(test_date=f'3:{selected_date}') 
+        #     # print("DEBUG show_todo", self.days[selected_date].date)
+        # if task_uuid in self.days[selected_date].todos:
+        #     todo = self.days[selected_date].todos[task_uuid]
+        # else:
+        #     todo = self.days[selected_date].add_todo(task_uuid)
+        linked_todos = [self.todos[c] for c in todo.children]
+        filtered_todos = [] #[t for t in self.todos.values() if t.visible and t != self and (t not in linked_todos) and (len(search) == 0 or t.matches(search))] 
+        return j2env.get_template('todo.html').render(
+                db=self,
+                todo=todo,
+                filtered_todos=filtered_todos,
+                linked_todos=linked_todos,
+                return_to=return_to)
+
+    # def update_todo_mini(self, task_uuid, date, day_effort, done, importance):
+    #     if date not in self.days.keys():
+    #         self.days[date] = self.add_day(test_date=f'Y:{date}') 
+    #         # print("DEBUG update_todo_min", self.days[date].date)
+    #     if task_uuid in self.days[date].todos.keys():
+    #         todo = self.days[date].todos[task_uuid]
+    #     else:
+    #         todo = self.days[date].add_todo(task_uuid)
+    #     todo.day_effort = day_effort
+    #     todo.done = done
+    #     todo.importance = importance
+    #     return todo
+
+    def collect_tags(self, tags_joined, tags_checked):
         tags = set()
         for tag in [tag.strip() for tag in tags_joined.split(';') if tag.strip() != '']:
             tags.add(tag)
         for tag in tags_checked:
             tags.add(tag)
-        task.tags = tags
-
-    def show_tasks(self):
-        return Template(form_header_tmpl + tag_filters_tmpl + tasks_tmpl + form_footer).render(db=self, action=self.prefix+'/tasks')
+        return tags
 
+    def update_todo_for_day(self, id_, date, effort, done, comment, importance):
+        todo = self.todos[id_]
+        todo.done = done
+        todo.efforts[date] = effort 
+        todo.comment = comment 
+        todo.importance = importance 
+
+    def update_todo(self, id_, efforts, done, comment, day_tags_joined, day_tags_checked, importance):
+        if len(efforts) == 0:
+            raise PlomException('todo must have at least one effort!')
+        todo = self.todos[id_]
+        todo.done = done
+        todo.efforts = efforts 
+        for date in todo.efforts:
+            if not date in self.days.keys():
+                self.add_day(date=date) 
+            if not self in self.days[date].linked_todos_as_list:
+                self.days[date].linked_todos_as_list += [todo]
+        todo.comment = comment 
+        todo.day_tags = self.collect_tags(day_tags_joined, day_tags_checked) 
+        todo.importance = importance 
+
+    def delete_todo(self, id_):
+        todo = self.todos[id_]
+        dates_to_delete = []
+        for date in todo.efforts.keys():
+            dates_to_delete += [date]
+        for date in dates_to_delete:
+            self.delete_effort(todo, date, force=True)
+        del self.todos[id_]
+
+    def delete_effort(self, todo, date, force=False):
+        if (not force) and len(todo.efforts) == 1:
+            raise PlomException('todo must retain at least one effort!')
+        self.days[date].linked_todos_as_list.remove(todo)
+        del todo.efforts[date]
+
+
+    # def update_todo(self, task_uuid, date, day_effort, done, comment, day_tags_joined, day_tags_checked, importance):
+    #     day_effort = float(day_effort) if len(day_effort) > 0 else None
+    #     importance = float(importance)
+    #     todo = self.update_todo_mini(task_uuid, date, day_effort, done, importance)
+    #     todo.comment = comment
+    #     todo.day_tags = self.collect_tags(day_tags_joined, day_tags_checked) 
+
+    # def link_day_with_todo(self, date, todo_id):
+    #     print("DEBUG link", date, todo_id)
+    #     todo_creation_date, task_uuid = todo_id.split('_')
+    #     todo = self.days[todo_creation_date].todos[task_uuid]
+    #     if date in todo.efforts.keys():
+    #         raise PlomException('todo already linked to respective day')
+    #     todo.set_day_effort(date, None)
+    #     if date not in self.days.keys():
+    #         print("DEBUG link_day_with_todo", date)
+    #         self.days[date] = self.add_day(test_date=f'Z:{date}') 
+    #     self.days[date].linked_todos_as_list += [todo]
+    #     print("DEBUG", date, self.days[date].linked_todos)
+
+    def show_task(self, id_, return_to='', search=''):
+        task = self.tasks[id_] if id_ else self.add_task()
+        selected = task.id_ in self.selected_day.todos.keys()
+        linked_tasks = [self.tasks[l] for l in task.links]
+        filtered_tasks = [t for t in self.tasks.values() if t.visible and t != self and (t not in linked_tasks) and (len(search) == 0 or t.matches(search))] 
+        return j2env.get_template('task.html').render(
+                db=self,
+                search=search,
+                tags=self.t_tags, 
+                filter_and=self.t_filter_and,
+                filter_not=self.t_filter_not,
+                filtered_tasks=filtered_tasks,
+                linked_tasks=linked_tasks,
+                task=task,
+                return_to=return_to)
+
+    def update_task(self, id_, title, default_effort, tags_joined, tags_checked, links, comment):
+        task = self.tasks[id_] if id_ in self.tasks.keys() else self.add_task(id_)
+        task.title = title
+        task.default_effort = float(default_effort) if len(default_effort) > 0 else None
+        task.tags = self.collect_tags(tags_joined, tags_checked) 
+        task.links = links
+        task.comment = comment 
+
+    def show_tasks(self, expand_uuid):
+        expanded_tasks = {}
+        if expand_uuid:
+            for uuid in self.tasks[expand_uuid].links:
+                expanded_tasks[uuid] = self.tasks[uuid]
+        return j2env.get_template('tasks.html').render(db=self, action=self.prefix+'/tasks', expand_uuid=expand_uuid, expanded_tasks=expanded_tasks)
+
+    def show_new_day(self, search, hide_chosen_tasks, sort_order=None):
+        prev_date_str, next_date_str = self.neighbor_dates()
+        chosen_todos = self.selected_day.linked_todos_as_list
+        relevant_todos = []
+        for todo in self.todos.values():
+            if todo.done or (not todo.visible) or (not todo.matches(search)) or todo in self.selected_day.linked_todos_as_list: # or todo.day.date == self.selected_day.date:  # TODO or todo is linked by day  
+                continue
+            relevant_todos += [todo] 
+        tasks = []
+        chosen_tasks = [todo.task for todo in self.selected_day.linked_todos_as_list]
+        for uuid, task in self.tasks.items():
+            if (not task.visible) or (not task.matches(search)) or (hide_chosen_tasks and task in chosen_tasks):
+                continue
+            tasks += [task]
+        if sort_order == 'title':
+            chosen_todos.sort(key=lambda t: t.title)
+            relevant_todos.sort(key=lambda t: t.title)
+            tasks.sort(key=lambda t: t.title)
+        elif sort_order == 'effort':
+            chosen_todos.sort(key=lambda t: t.day_effort if t.day_effort else t.default_effort if t.done else 0, reverse=True)
+            relevant_todos.sort(key=lambda t: t.total_effort, reverse=True)
+            tasks.sort(key=lambda t: t.default_effort, reverse=True)
+        return j2env.get_template('new_day.html').render(
+                sort=sort_order,
+                tags=self.t_tags,
+                chosen_todos=chosen_todos,
+                filter_and=self.t_filter_and,
+                filter_not=self.t_filter_not,
+                day=self.selected_day,
+                prev_date=prev_date_str,
+                next_date=next_date_str,
+                tasks=tasks,
+                hide_chosen_tasks=hide_chosen_tasks,
+                relevant_todos=relevant_todos,
+                search=search)
+
+
+class ParamsParser:
+
+    def __init__(self, parsed_url_query, cookie_db):
+        self.params = parse_qs(parsed_url_query)
+        self.cookie_db = cookie_db
+
+    def get(self, key, default=None):
+        boolean = bool == type(default) 
+        param = self.params.get(key, [default])[0]
+        if boolean:
+            param = param != '0' 
+        return param 
+
+    def get_cookied(self, key, default=None):
+        param = self.get(key, default)
+        if param == '-':
+            param = None
+            if key in self.cookie_db.keys():
+                del self.cookie_db[key]
+        if param is None and key in self.cookie_db.keys():
+            param = self.cookie_db[key]
+        if param is not None:
+            self.cookie_db[key] = param
+        return param
+
+    def get_cookied_chain(self, key, default=None):
+        # default = default if default else ['-']
+        params = self.params.get(key, default)
+        if params == ['-']:
+            params = None 
+            if key in self.cookie_db.keys():
+                del self.cookie_db[key]
+        if params is None and key in self.cookie_db.keys():
+            params = self.cookie_db[key]
+        if params is not None:
+            self.cookie_db[key] = params
+        return params
 
 
 class TodoHandler(PlomHandler):
@@ -571,84 +833,190 @@ class TodoHandler(PlomHandler):
 
     def write_db(self):
         from urllib.parse import urlencode
-        app_config = self.apps['todo'] if hasattr(self, 'apps') else self.config()
+        config = self.apps['todo'] if hasattr(self, 'apps') else self.config_init()
         length = int(self.headers['content-length'])
         postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
         parsed_url = urlparse(self.path)
-        db = TodoDB(prefix=app_config['prefix'])
-
-        if parsed_url.path == app_config['prefix'] + '/calendar':
-            start = postvars['start'][0] if len(postvars['start'][0]) > 0 else '-'
-            end = postvars['end'][0] if len(postvars['end'][0]) > 0 else '-'
-            homepage = f'{app_config["prefix"]}/calendar?start={start}&end={end}'
-
-        elif parsed_url.path == app_config['prefix'] + '/todo':
-            task_uuid = postvars['task_uuid'][0]
-            date = postvars['date'][0]
+        site = path_split(urlparse(self.path).path)[1]
+        # site = path_split(parsed_url.path)[1]
+        db = TodoDB(prefix=config['prefix'])
+        redir_params = []
+        for param_name, filter_db_name in {('t_and', 't_filter_and'), ('t_not', 't_filter_not')}:
+            filter_db = getattr(db, filter_db_name)
+            if param_name in postvars.keys():
+                for target in postvars[param_name]:
+                    if len(target) > 0 and not target in filter_db:
+                        filter_db += [target]
+                if len(filter_db) == 0:
+                    redir_params += [(param_name, '-')]
+            redir_params += [(param_name, f) for f in filter_db]
+
+        def collect_checked(prefix, postvars):
             tags_checked = []
-            prefix = 'day_tag_'
             for k in postvars.keys():
                 if k.startswith(prefix):
                     tags_checked += [k[len(prefix):]]
-            db.update_todo(task_uuid, date, postvars['day_weight'][0], 'done' in postvars.keys(), postvars['comment'][0], postvars['day_tags_joined'][0], tags_checked)
-            homepage = f'{app_config["prefix"]}/todo?task={task_uuid}&date={date}'
-
-        elif parsed_url.path == app_config['prefix'] + '/task':
+            return tags_checked
+        
+        if 'calendar' == site:
+            redir_params += [('start', postvars['start'][0] if len(postvars['start'][0]) > 0 else '-')]
+            redir_params += [('end', postvars['end'][0] if len(postvars['end'][0]) > 0 else '-')]
+
+        elif 'todo' == site:
+            # task_uuid = postvars['task_uuid'][0]
+            todo_id = postvars['todo_id'][0]
+            # date = postvars['date'][0]
+            old_todo = db.todos[todo_id] 
+            efforts = {}
+            for i, date in enumerate(postvars['effort_date']):
+                if '' == date:
+                    continue
+                efforts[date] = float(postvars['effort'][i]) if len(postvars['effort'][i]) > 0 else None 
+            if 'delete_effort' in postvars.keys():
+                for date in postvars['delete_effort']:
+                    del efforts[date]
+            if 'delete' in postvars.keys():
+                # old_todo = db.days[date].todos[task_uuid]
+                if 'done' in postvars or postvars['comment'][0] != '' or len(collect_checked('day_tag_', postvars)) > 0 or postvars['joined_day_tags'][0] != '' or len(efforts) > 0:
+                    raise PlomException('will not remove todo of preserve-worthy values')
+                db.delete_todo(todo_id) 
+                # db.write()
+                # self.redirect('new_day')
+            else:
+                # redir_params += [('task', task_uuid), ('date', date)]
+                redir_params += [('id', todo_id)]
+                # db.update_todo(task_uuid, date, postvars['day_effort'][0], 'done' in postvars.keys(), postvars['comment'][0], postvars['joined_day_tags'][0], collect_checked('day_tag_', postvars), postvars['importance'][0])
+                # efforts = {}
+                # for i, date in enumerate(postvars['effort_date']):
+                #     if '' == date:
+                #         continue
+                #     efforts[date] = postvars['effort'][i] if len(postvars['effort'][i]) > 0 else None 
+                if 'delete_effort' in postvars.keys():
+                    for date in postvars['delete_effort']:
+                        db.delete_effort(old_todo, date)
+                db.update_todo(id_=todo_id,
+                               efforts=efforts,
+                               done='done' in postvars.keys(),
+                               comment=postvars['comment'][0],
+                               day_tags_joined=postvars['joined_day_tags'][0],
+                               day_tags_checked=collect_checked('day_tag_', postvars),
+                               importance=float(postvars['importance'][0]))
+
+        elif 'task' == site:
             id_ = postvars['id'][0]
-            tags_checked = []
-            prefix = 'tag_'
-            for k in postvars.keys():
-                if k.startswith(prefix):
-                    tags_checked += [k[len(prefix):]]
-            db.update_task(id_, postvars['title'][0], postvars['default_weight'][0], postvars['tags_joined'][0], tags_checked)
-            homepage = f'{app_config["prefix"]}/task?id={id_}'
-
-        elif parsed_url.path in {app_config['prefix'] + '/tasks', app_config['prefix'] + '/day'}:
-            data = []
-            for target in postvars['t_and']:
-                if len(target) > 0 and not target in db.t_filter_and:
-                    db.t_filter_and += [target]
-            if len(db.t_filter_and) == 0:
-                data += [('t_and', '-')]
-            for target in postvars['t_not']:
-                if len(target) > 0 and not target in db.t_filter_not:
-                    db.t_filter_not += [target]
-            if len(db.t_filter_not) == 0:
-                data += [('t_not', '-')]
-            data += [('t_and', f) for f in db.t_filter_and] + [('t_not', f) for f in db.t_filter_not]
-            if parsed_url.path == app_config['prefix'] + '/tasks':
-                encoded_params = urlencode(data)
-                homepage = f'{app_config["prefix"]}/tasks?{encoded_params}'
-
-            elif parsed_url.path == app_config['prefix'] + '/day':
-                db.hide_unchosen = 'hide_unchosen' in postvars.keys()
-                db.hide_done = 'hide_done' in postvars.keys()
-                data += [('hide_unchosen', int(db.hide_unchosen))] + [('hide_done', int(db.hide_done))]
-
-                db.selected_date = postvars['original_selected_date'][0]
-                new_selected_date = postvars['new_selected_date'][0]
-                try:
-                    datetime.strptime(new_selected_date, DATE_FORMAT)
-                except ValueError:
-                    raise PlomException(f'{app_config["prefix"]} bad date string: {new_selected_date}')
-                if new_selected_date != db.selected_date:
-                    db.change_selected_days_date(new_selected_date)
-                if 't_uuid' in postvars.keys():
-                    for i, uuid in enumerate(postvars['t_uuid']):
-                        t = db.tasks[uuid]
-                        if uuid in db.selected_day.todos.keys() and ((not 'choose' in postvars) or uuid not in postvars['choose']):
-                            del db.selected_day.todos[uuid]
-                    if 'choose' in postvars.keys():
-                        for i, uuid in enumerate(postvars['t_uuid']):
-                            if uuid in postvars['choose']:
-                                done = 'done' in postvars and uuid in postvars['done']
-                                db.update_todo_mini(uuid, db.selected_date, postvars['day_weight'][i], done)
+            redir_params += [('id', id_)]
+            if 'filter' in postvars.keys():
+                redir_params += [('search', postvars['search'][0])]
+            elif 'title' in postvars.keys():
+                links = [] if not 'link_task' in postvars.keys() else postvars['link_task']
+                # db.update_task(id_, postvars['title'][0], postvars['default_effort'][0], postvars['joined_tags'][0], collect_checked('tag_', postvars), collect_checked('link_', postvars), postvars['comment'][0])
+                db.update_task(id_, postvars['title'][0], postvars['default_effort'][0], postvars['joined_tags'][0], collect_checked('tag_', postvars), links, postvars['comment'][0])
+                # if 'as_todo' in postvars.keys() and id_ not in db.selected_day.todos.keys():
+                #     db.update_todo_mini(id_, db.selected_date, None, False, 1.0)
+                # elif 'as_todo' not in postvars.keys() and id_ in db.selected_day.todos.keys():
+                #     todo = db.selected_day.todos[id_]
+                #     if todo.internals_empty() and (not todo.done) and todo.day_effort is None:
+                #         del db.selected_day.todos[id_]
+                #     else:
+                #         raise PlomException('cannot deselect task as todo of preserve-worthy values')
+
+        elif 'new_day' == site:
+            if 'filter' in postvars.keys():
+                redir_params += [('search', postvars['search'][0])]
+                redir_params += [('hide_chosen_tasks', int('hide_chosen_tasks' in postvars.keys()))]
+            else:
+                db.selected_date = postvars['date'][0]
+                todos_to_shrink = []
+                todos_to_delete = []
+                for todo in db.selected_day.linked_todos_as_list:
+                    if todo.visible and not ('chosen_todo' in postvars.keys() and todo.id_ in postvars['chosen_todo']):
+                        if len(todo.comment) > 0 or len(todo.day_tags) > 0 or not todo.is_effort_removable(db.selected_date):
+                            # print("DEBUG", len(todo.comment) > 0, len(todo.day_tags) > 0, todo.is_effort_removable(db.selected_date))
+                            raise PlomException('will not remove effort of preserve-worthy values')
+                        if len(todo.efforts) > 1:
+                            todos_to_shrink += [todo]
+                            # db.delete_effort(todo, db.selected_date)
+                        else:
+                            todos_to_delete += [todo]
+                            # db.delete_todo(todo.id_)
+                for todo in todos_to_shrink:
+                    db.delete_effort(todo, db.selected_date)
+                for todo in todos_to_delete:
+                    db.delete_todo(todo.id_)
+                if 'choose_task' in postvars.keys():
+                    for id_ in postvars['choose_task']:
+                        db.add_todo(task=db.tasks[id_], efforts={db.selected_date: None})
+                if 'choose_todo' in postvars.keys():
+                    for id_ in postvars['choose_todo']:
+                        todo = db.todos[id_]
+                        todo.efforts[db.selected_date] = None
+
+            # if 'choose_task' in postvars.keys():
+            #     for i, uuid in enumerate(postvars['choose_task']):
+            #          if not uuid in db.selected_day.todos.keys():
+            #             # task = db.tasks[uuid]
+            #              db.update_todo_mini(uuid, db.selected_date, None, False, 1.0)
+            # if 'choose_todo' in postvars.keys():
+            #     for i, id_ in enumerate(postvars['choose_todo']):
+            #         if not id_ in [todo.id_ for todo in db.selected_day.linked_todos_as_list]:
+            #             db.link_day_with_todo(db.selected_date, id_)
+
+        elif 'do_day' == site:
+            if 'filter' in postvars.keys():
+                redir_params += [('hide_done', int('hide_done' in postvars.keys()))]
+            else:
+                db.selected_date = postvars['date'][0]
+                redir_params += [('date', db.selected_date)]
+                db.selected_day.comment = postvars['day_comment'][0]
+                if 'todo_id' in postvars.keys():
+                    for i, todo_id in enumerate(postvars['todo_id']):
+                        old_todo = None if not todo_id in db.todos.keys() else db.todos[todo_id]
+                        done = ('done' in postvars) and (todo_id in postvars['done'])
+                        day_effort_input = postvars['effort'][i]
+                        day_effort = float(day_effort_input) if len(day_effort_input) > 0 else None
+                        comment = postvars['effort_comment'][i]
+                        importance = float(postvars['importance'][i])
+                        if old_todo and old_todo.done == done and old_todo.day_effort == day_effort and comment == old_todo.comment and old_todo.importance == importance:
+                            continue
+                        db.update_todo_for_day(todo_id, db.selected_date, day_effort, done, comment, importance)
+
+        elif 'day' == site:
+            # always store the two hide params in the URL if possible … TODO: find out if really necessary
+            if 'expect_unchosen_done' in postvars.keys():
+                redir_params += [('hide_unchosen', int('hide_unchosen' in postvars.keys()))] + [('hide_done', int('hide_done' in postvars.keys()))]
+
+            if 'date' in postvars.keys():
+                db.selected_date = postvars['date'][0]
                 if 'day_comment' in postvars.keys():
                     db.selected_day.comment = postvars['day_comment'][0]
-                data += [('selected_date', db.selected_date)]
-                encoded_params = urlencode(data)
-                homepage = f'{app_config["prefix"]}/day?{encoded_params}'
+                redir_params += [('date', db.selected_date)]
 
+                # handle todo list updates via task UUIDs
+                if 't_uuid' in postvars.keys():
+                    for i, uuid in enumerate(postvars['t_uuid']):
+                        task = db.tasks[uuid]
+                        old_todo = None if not uuid in db.selected_day.todos.keys() else db.selected_day.todos[uuid]
+                        selects_as_todo = 'choose' in postvars and uuid in postvars['choose']
+                        too_much_keepworthy_data = ('done' in postvars and uuid in postvars['done']) or postvars['day_effort'][i] != '' or (old_todo and not old_todo.internals_empty())
+                        if old_todo and too_much_keepworthy_data and not selects_as_todo:
+                            raise PlomException('cannot deselect task as todo of preserve-worthy values')
+                        elif old_todo and not selects_as_todo:
+                            del db.selected_day.todos[uuid]
+                        elif too_much_keepworthy_data or selects_as_todo:
+                            done = ('done' in postvars) and (uuid in postvars['done'])
+                            day_effort_input = postvars['day_effort'][i]
+                            day_effort = float(day_effort_input) if len(day_effort_input) > 0 else None
+                            importance = float(postvars['importance'][i])
+                            if old_todo and old_todo.done == done and old_todo.day_effort == day_effort and old_todo.importance == importance:
+                                continue
+                            db.update_todo_mini(uuid, db.selected_date, day_effort, done, importance)
+
+        if 'return_to' in postvars.keys() and len(postvars['return_to'][0]) > 0:
+            homepage = postvars['return_to'][0]
+        else:
+            encoded_params = urlencode(redir_params)
+            # homepage = f'{parsed_url.path}?{encoded_params}'
+            homepage = f'{site}?{encoded_params}'
         db.write()
         self.redirect(homepage)
 
@@ -657,90 +1025,92 @@ class TodoHandler(PlomHandler):
         self.try_do(self.show_db)
 
     def show_db(self):
-        app_config = self.apps['todo'] if hasattr(self, 'apps') else self.config()
-        cookie_db = self.get_cookie_db(app_config['cookie_name'])
+        config = self.apps['todo'] if hasattr(self, 'apps') else self.config_init()
+        cookie_db = self.get_cookie_db(config['cookie_name'])
         parsed_url = urlparse(self.path)
-        params = parse_qs(parsed_url.query)
-        selected_date = None
-        t_filter_and = None
-        t_filter_not = None
-        hide_unchosen = False
-        hide_done = False
-        if parsed_url.path in {app_config['prefix'] + '/day', app_config['prefix'] + '/tasks'}:
-            selected_date = params.get('selected_date', [None])[0]
-            if selected_date is None and 'selected_date' in cookie_db.keys():
-                selected_date = cookie_db['selected_date']
-            cookie_db['selected_date'] = selected_date
-            t_filter_and = params.get('t_and', None)
-            if t_filter_and is None and 't_and' in cookie_db.keys():
-                t_filter_and = cookie_db['t_and']
-            elif t_filter_and == ['-']:
-                t_filter_and = None
-            cookie_db['t_and'] = t_filter_and
-            t_filter_not = params.get('t_not', None)
-            if t_filter_not is None:
-                if 't_not' in cookie_db.keys():
-                    t_filter_not = cookie_db['t_not']
-                else:
-                    t_filter_not = ['deleted']
-            elif t_filter_not == ['-']:
-                t_filter_not = None
-            cookie_db['t_not'] = t_filter_not
-        if parsed_url.path == app_config['prefix'] + '/day':
-            hide_unchosen_params = params.get('hide_unchosen', [])
-            if 0 == len(hide_unchosen_params):
-                if 'hide_unchosen' in cookie_db.keys():
-                    hide_unchosen = cookie_db['hide_unchosen']
-            else:
-                hide_unchosen = hide_unchosen_params[0] != '0'
-            cookie_db['hide_unchosen'] = hide_unchosen
-            hide_done_params = params.get('hide_done', [])
-            if 0 == len(hide_done_params):
-                if 'hide_done' in cookie_db.keys():
-                    hide_done = cookie_db['hide_done']
-            else:
-                hide_done = hide_done_params[0] != '0'
-            cookie_db['hide_done'] = hide_done
-        db = TodoDB(app_config['prefix'], selected_date, t_filter_and, t_filter_not, hide_unchosen, hide_done)
-        if parsed_url.path == app_config['prefix'] + '/day':
-            page = db.show_day()
-        elif parsed_url.path == app_config['prefix'] + '/todo':
-            todo_date = params.get('date', [None])[0]
-            task_uuid = params.get('task', [None])[0]
-            page = db.show_todo(task_uuid, todo_date)
-        elif parsed_url.path == app_config['prefix'] + '/task':
-            id_ = params.get('id', [None])[0]
-            page = db.show_task(id_)
-        elif parsed_url.path == app_config['prefix'] + '/tasks':
-            page = db.show_tasks()
-        elif parsed_url.path == app_config['prefix'] + '/add_task':
+        site = path_split(parsed_url.path)[1]
+        # params = parse_qs(parsed_url.query)
+        params = ParamsParser(parsed_url.query, cookie_db)
+
+        # def get_param(param_name, boolean=False, chained=False, none_as_empty_string=False):
+        #     if chained:
+        #         param = params.get(param_name, None)
+        #     elif none_as_empty_string:
+        #         param = params.get(param_name, [''])[0]
+        #     else: 
+        #         param = params.get(param_name, [None])[0]
+        #     if (not chained and param == '-') or (chained and param == ['-']):
+        #         param = None
+        #         if param_name in cookie_db.keys():
+        #             del cookie_db[param_name]
+        #     if param is None and param_name in cookie_db.keys():
+        #         param = cookie_db[param_name]
+        #     if param is not None:
+        #         if boolean:
+        #             param = param != '0'
+        #             cookie_db[param_name] = str(int(param))
+        #         else:
+        #             cookie_db[param_name] = param
+        #     elif param is boolean:
+        #         param = False
+        #     return param
+
+        selected_date = t_filter_and = t_filter_not = None
+        hide_unchosen = hide_done = False
+        # return_to = params.get('return_to', [''])[0]
+        return_to = params.get('return_to', '')
+        if site in {'do_day', 'new_day'}:
+            selected_date = params.get_cookied('date')
+        if site in {'do_day', 'new_day', 'task'}:
+            t_filter_and = params.get_cookied_chain('t_and')
+            # t_filter_not = params.get_cookied_chain('t_not', ['deleted', 'cancelled'])
+            t_filter_not = params.get_cookied_chain('t_not')
+        # if site in {'day','tasks', 'task', 'new_day'}:
+        #     t_filter_and = get_param('t_and', chained=True)
+        #     t_filter_not = get_param('t_not', chained=True)
+        if 'do_day' == site:
+            # hide_unchosen = get_param('hide_unchosen', boolean=True)
+            hide_done = params.get('hide_done', False) 
+        db = TodoDB(config['prefix'], selected_date, t_filter_and, t_filter_not, hide_unchosen, hide_done)
+        if 'do_day' == site:
+            sort_order = params.get_cookied('sort')
+            page = db.show_do_day(sort_order)
+        elif 'new_day' == site:
+            sort_order = params.get_cookied('sort')
+            hide_chosen_tasks = params.get('hide_chosen_tasks', False)
+            search = params.get('search', '')
+            page = db.show_new_day(search, hide_chosen_tasks, sort_order)
+        elif site == 'todo':
+            todo_id = params.get('id')
+            page = db.show_todo(todo_id, return_to)
+            # todo_id = params.get('id')
+            # if todo_id:
+            #     todo_date, task_uuid = todo_id.split('_') 
+            # else:
+            #     todo_date = params.get('date')
+            #     task_uuid = params.get('task')
+            # page = db.show_todo(task_uuid, todo_date, return_to)
+        elif 'task' == site:
+            id_ = params.get('id')
+            search = params.get('search', '')
+            page = db.show_task(id_, return_to, search)
+        elif 'tasks' == site:
+            expand_uuid = params.get('expand_uuid')
+            page = db.show_tasks(expand_uuid)
+        elif 'add_task' == site:
             page = db.show_task(None)
-        elif parsed_url.path == app_config['prefix'] + '/unset_cookie':
+        elif 'unset_cookie' == site:
             page = 'no cookie to unset.'
             if len(cookie_db) > 0:
-                self.unset_cookie(app_config['cookie_name'], app_config['cookie_path'])
+                self.unset_cookie(config['cookie_name'], config['cookie_path'])
                 page = 'cookie unset!'
         else:
-            start_date = params.get('start', [None])[0]
-            if start_date is None:
-                if 'calendar_start' in cookie_db.keys():
-                    start_date = cookie_db['calendar_start']
-                else:
-                    start_date = 'today'
-            elif start_date == '-':
-                start_date = None
-            cookie_db['calendar_start'] = start_date
-            end_date = params.get('end', [None])[0]
-            if end_date is None and 'calendar_end' in cookie_db.keys():
-                end_date = cookie_db['calendar_end']
-            elif end_date == '-':
-                end_date = None
-            cookie_db['calendar_end'] = end_date
+            start_date = params.get_cookied('start')
+            end_date = params.get_cookied('end')
             page = db.show_calendar(start_date, end_date)
-        header = Template(html_head).render(db=db, prefix=app_config['prefix'], date=selected_date)
-        if parsed_url.path != app_config['prefix'] + '/unset_cookie':
-            self.set_cookie(app_config['cookie_name'], app_config['cookie_path'], cookie_db)
-        self.send_HTML(header + page)
+        if 'unset_cookie' != site:
+            self.set_cookie(config['cookie_name'], config['cookie_path'], cookie_db)
+        self.send_HTML(page)
 
 
 if __name__ == "__main__":