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Various small fixes.
[misc] / todo.py
diff --git a/todo.py b/todo.py
index 8c7029cab8eda5683b668857a220d7faa283b4fe..a4d7da0e56fce598906e40ad42fd7a247d3934f7 100644 (file)
--- a/todo.py
+++ b/todo.py
@@ -1,62 +1,26 @@
-from plomlib import PlomDB, run_server, PlomHandler, PlomException 
+from plomlib import PlomDB, run_server, PlomHandler, PlomException
 import json
 from uuid import uuid4
-from datetime import datetime
+from datetime import datetime, timedelta
 from urllib.parse import parse_qs
+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
-
-tmpl = """
-<style>
-td { border: 1px solid black; }
-</style>
-<body>
-<form action="{{homepage}}" method="POST">
-
-mandatory tags: {% for t_tag in db.t_tags | sort %}
-<input name="t_filter_and" type="checkbox" value="{{ t_tag }}" {% if t_tag in db.t_filter_and %} checked {% endif %} >{{ t_tag }}
-{% endfor %}
-<br />
-forbidden tags: {% for t_tag in db.t_tags | sort %}
-<input name="t_filter_not" type="checkbox" value="{{ t_tag }}" {% if t_tag in db.t_filter_not %} checked {% endif %} >{{ t_tag }}
-{% endfor %}
-<table>
-<tr><th colspan=2></th><th>date</th><td colspan=2><input name="today_date" value="{{ db.today_date }}" size=8 /></td><th>archive?</th><td><input type="checkbox" name="archive_today" /></td><td>{{ db.today.todos_sum|round(2) }}</td><th>comment:</th><td><input name="comment" value="{{ db.today.comment|e }}"></td></tr>
-<tr><th>default<br />weight</th><th>title</th><th>tags</th><th>today?</th><th>done?</th><th colspan=2>day<br />weight</th></tr>
-{% for uuid, t in db.tasks.items() | sort(attribute='1.title', reverse=True) %}
-{% if t.visible %}
-<input name="t_uuid" value="{{ uuid }}" type="hidden" >
-<tr>
-<td><input name="t_default_weight" value="{{ t.default_weight }}" type="number" step=0.1 size=5 required/></td>
-<td><input name="t_title" value="{{ t.title|e }}"/></td>
-<td><input name="t_tags" value="{{ t.tags_joined|e }}" >
-<td><input name="do_today" type="checkbox" value="{{ uuid }}" {% if uuid in db.today.todos.keys() %}checked{% endif %} ></td>
-<td><input name="done" type="checkbox" value="{{ uuid }}" {% if uuid in db.today.todos.keys() and db.today.todos[uuid].done %}checked{% endif %} ></td>
-<td colspan=2><input name="weight" type="number" step=0.1 size=5 value="{% if uuid in db.today.todos.keys() and db.today.todos[uuid].weight %}{{ db.today.todos[uuid].weight }}{% endif %}" ></td>
-</tr>
-{% endif %}
-{% endfor %}
-</table>
-
-<input type="submit" value="OK">
-<table>
-{% for date, day in db.old_days.items() | sort(reverse=True) %}
-<tr><td>{{ date }} ({{ day.todos_sum|round(2) }}) {{ day.comment|e }} <input type="submit" name="edit_{{date}}" value="edit" /></td></tr>
-{% for task, todo in day.todos.items() | sort(attribute='1.title', reverse=True)  %}
-<tr><td>{{ todo.title }}</td><td>{% if todo.done %}✓{% endif %}</td><td>{{ todo.weight }}</td></tr>
-{% endfor %}
-{% endfor %}
-</table>
-</form>
-"""
+DATE_FORMAT = '%Y-%m-%d'
+j2env = JinjaEnv(loader=JinjaFSLoader('todo_templates'))
 
 class Task:
 
-    def __init__(self, title_history={}, tags_history={}, default_weight_history={}):
-        self.title_history = title_history.copy()
-        self.tags_history = tags_history.copy()
-        self.default_weight_history = default_weight_history.copy()
+    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_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):
@@ -66,260 +30,1088 @@ class Task:
 
     def _last_of_history(self, history, default):
         keys = sorted(history.keys())
-        return default if 0 == len(history) else history[keys[-1]] 
+        return default if 0 == len(history) else history[keys[-1]]
 
     @classmethod
-    def from_dict(cls, d):
-        return cls(
-                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 tags_from_joined_string(self, tags_string):
-        tags = set()
-        for tag in [tag.strip() for tag in tags_string.split(';') if tag.strip() != '']:
-            tags.add(tag)
-        self.set_tags(tags)
+    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 tags_joined(self):
-        return ';'.join(sorted(list(self.tags)))
+    def default_effort(self):
+        return self._last_of_history(self.default_effort_history, 1)
 
-    def set_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)
 
-    @property
-    def default_weight(self):
-        return self._last_of_history(self.default_weight_history, 1)
+    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_effort
+        return ret
 
-    def set_title(self, title):
-        self._set_with_history(self.title_history, title)
+    # @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):
         return self._last_of_history(self.title_history, '')
 
+    @title.setter
+    def title(self, title):
+        self._set_with_history(self.title_history, title)
+
     def title_at(self, queried_date):
-        ret = self.title_history[sorted(self.title_history.keys())[0]] 
+        ret = self.title_history[sorted(self.title_history.keys())[0]]
         for date_key, title in self.title_history.items():
             if date_key > f'{queried_date} 23:59:59':
                 break
             ret = title
         return ret
 
-    def set_tags(self, tags):
-        self._set_with_history(self.tags_history, set(tags))
+    @property
+    def current_title(self):
+        return self.title_at(self.db.selected_date)
 
     @property
     def tags(self):
         return self._last_of_history(self.tags_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}
+    @tags.setter
+    def tags(self, tags):
+        self._set_with_history(self.tags_history, set(tags))
+
+    @property
+    def links(self):
+        return self._last_of_history(self.links_history, set())
+
+    @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
 
 
 class Day:
 
-    def __init__(self, todos, comment=''):
-        self.todos = todos 
+    # def __init__(self, db, todos=None, comment='', date=None):
+    def __init__(self, db, date, comment=''):
+        self.date = date 
+        self.db = db
         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, d):
-        todos = {}
+    def from_dict(cls, db, d, date=None):
+        todos = {}
         comment = d['comment'] if 'comment' in d.keys() else ''
-        for uuid, todo_dict in d['todos'].items():
-            todos[uuid] = Todo.from_dict(todo_dict)
-        return cls(todos, comment)
+        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, '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, 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 todos_sum(self):
+    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
+        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
 
-    def to_dict(self):
-        d = {'comment': self.comment, 'todos': {}}
-        for task_uuid, todo in self.todos.items():
-            d['todos'][task_uuid] = todo.to_dict()
-        return d
+    @property
+    def todos_sum(self):
+        return self._todos_sum()
+
+    # @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)
 
 
 class Todo:
 
-    def __init__(self, done=False, weight=None):
+    # 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.weight = 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, d):
-        return cls(d['done'], d['weight'])
+    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, 'weight': self.weight}
+        # 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_effort(self):
+        return self.task.default_effort_at(self.sorted_effort_dates[0])
+
+    # @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 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.sorted_effort_dates[0])
+
+    @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):
 
-    def __init__(self, t_filter_and = set(), t_filter_not = set()):
-        self.t_filter_and = t_filter_and
-        self.t_filter_not = t_filter_not
-        self.old_days = {}
+    def __init__(self, prefix, selected_date=None, t_filter_and = None, t_filter_not = None, hide_unchosen=False, hide_done=False):
+        self.prefix = prefix
+        self.selected_date = selected_date if selected_date else str(datetime.now())[:10]
+        self.t_filter_and = t_filter_and if t_filter_and else []
+        self.t_filter_not = t_filter_not if t_filter_not else []
+        self.hide_unchosen = hide_unchosen
+        self.hide_done = hide_done
+        self.days = {}
         self.tasks = {}
-        self.reset_today()
-        self.t_tags = set() 
+        self.t_tags = set()
+        self.todos = {}
         super().__init__(db_path)
 
     def read_db_file(self, f):
         d = json.load(f)
-        self.today = Day.from_dict(d['today'])
-        self.today_date = d['today_date'] 
-        for uuid, t_dict in d['tasks'].items():
-            t = Task.from_dict(t_dict)
-            self.tasks[uuid] = t
-            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
+        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)
-        for date, day_dict in d['old_days'].items():
-            self.old_days[date] = Day.from_dict(day_dict)
+        # 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):
+        for uuid, t in self.tasks.items():
+            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 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 = {
-                'today': self.today.to_dict(),
-                'today_date': self.today_date,
-                't_filter_and': list(self.t_filter_and),
-                't_filter_not': list(self.t_filter_not),
-                'tasks': {},
-                'old_days': {}
-        }
+        d = {'tasks': {}, 'days': {}, 'todos': {}}
         for uuid, t in self.tasks.items():
              d['tasks'][uuid] = t.to_dict()
-        for date, day in self.old_days.items():
-            d['old_days'][date] = day.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(date=self.selected_date)
+            # print("DEBUG selected_day", self.days[self.selected_date].date)
+        return self.days[self.selected_date]
+
     def write(self):
+        dates_to_purge = []
+        for date, day in self.days.items():
+            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 save_today(self):
-        if self.today_date in self.old_days.keys():
-            raise PlomException('cannot use same date twice')
-        for task_uuid, todo in [(task_uuid, todo) for task_uuid, todo in self.today.todos.items()
-                                if not todo.weight]:
-            todo.weight = self.tasks[task_uuid].default_weight
-        self.old_days[self.today_date] = self.today
-
-    def reset_today(self, date=None):
-        if date:
-            self.today_date = date 
-            self.today = self.old_days[date]
-            del self.old_days[date]
+    def add_task(self, id_=None, dict_source=None, return_id=False):
+        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:
-            self.today_date = str(datetime.now())[:10]
-            self.today = Day({})
+            return t
+
+    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, 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 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 = 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:
+                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)
+        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):
-    
+
+    def config_init(self):
+        return {
+            'cookie_name': 'todo_cookie',
+            'prefix': '',
+            'cookie_path': '/'
+        }
+
     def app_init(self, handler):
         default_path = '/todo'
-        handler.add_route('GET', default_path, self.show_db) 
-        handler.add_route('POST', default_path, self.write_db) 
-        return 'todo', default_path 
+        handler.add_route('GET', default_path, self.show_db)
+        handler.add_route('POST', default_path, self.write_db)
+        return 'todo', {'cookie_name': 'todo_cookie', 'prefix': default_path, 'cookie_path': default_path}
 
     def do_POST(self):
+        self.try_do(self.config_init)
         self.try_do(self.write_db)
 
     def write_db(self):
         from urllib.parse import urlencode
-        db = TodoDB()
+        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)
+        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]
 
-        import pprint
-        pp = pprint.PrettyPrinter(indent=4)
-        pp.pprint(postvars)
-
-        db.t_filter_and = set()
-        db.t_filter_not = set()
-        if 't_filter_and' in postvars.keys():
-            for target in postvars['t_filter_and']:
-                db.t_filter_and.add(target) 
-        if 't_filter_not' in postvars.keys():
-            for target in postvars['t_filter_not']:
-                db.t_filter_not.add(target) 
-        if 't_uuid' in postvars.keys():
-            new_postvars_t_uuid = postvars['t_uuid'].copy()
-            for i, uuid in enumerate(postvars['t_uuid']):
-                if len(uuid) < 36 and len(postvars['t_title'][i]) > 0:
-                        t = Task() 
-                        new_uuid = str(uuid4()) 
-                        db.tasks[new_uuid] = t
-                        new_postvars_t_uuid[i] = new_uuid
-                        for key in [k for k in postvars.keys() if not k == 't_uuid']:
-                            if uuid in postvars[key]:
-                                uuid_index = postvars[key].index(uuid)
-                                postvars[key][uuid_index] = new_uuid
-            postvars['t_uuid'] = new_postvars_t_uuid
-            for i, uuid in enumerate(postvars['t_uuid']):
-                if len(uuid) < 36:
+        def collect_checked(prefix, postvars):
+            tags_checked = []
+            for k in postvars.keys():
+                if k.startswith(prefix):
+                    tags_checked += [k[len(prefix):]]
+            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
-                t = db.tasks[uuid]
-                t.set_title(postvars['t_title'][i])
-                t.tags_from_joined_string(postvars['t_tags'][i])
-                t.set_default_weight(float(postvars['t_default_weight'][i]))
-                if uuid in db.today.todos.keys() and ((not 'do_today' in postvars) or uuid not in postvars['do_today']):
-                    del db.today.todos[uuid]
-            if 'do_today' in postvars.keys():
-                for i, uuid in enumerate(postvars['t_uuid']):
-                    if uuid in postvars['do_today']:
-                        done = 'done' in postvars and uuid in postvars['done']
-                        weight = float(postvars['weight'][i]) if postvars['weight'][i] else None
-                        db.today.todos[uuid] = Todo(done, weight)
-        db.today_date = postvars['today_date'][0]
-        db.today.comment = postvars['comment'][0]
-        switch_edited_day = None
-        for date in db.old_days.keys():
-            if f'edit_{date}' in postvars.keys():
-                switch_edited_day = date
-                break
-        if 'archive_today' in postvars.keys() or switch_edited_day:
-            db.save_today()
-            if switch_edited_day:
-                db.reset_today(date) 
+                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]
+            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.reset_today()
+                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]
+                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()
-        homepage = self.apps['todo'] if hasattr(self, 'apps') else self.homepage
-        data = [('t_and', f) for f in db.t_filter_and] + [('t_not', f) for f in db.t_filter_not]
-        encoded_params = urlencode(data)
-        homepage += '?' + encoded_params
         self.redirect(homepage)
 
     def do_GET(self):
+        self.try_do(self.config_init)
         self.try_do(self.show_db)
 
     def show_db(self):
-        from jinja2 import Template
-        from urllib.parse import urlparse
+        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)
-        t_filter_and = set(params.get('t_and', []))
-        t_filter_not = set(params.get('t_not', ['deleted']))
-        db = TodoDB(t_filter_and, t_filter_not)
-        for i in range(10):
-            db.tasks[f'new{i}'] = Task()
-        for date, day in db.old_days.items():
-            for task_uuid, todo in day.todos.items():
-                todo.title = db.tasks[task_uuid].title_at(date)
-        page = Template(tmpl).render(db=db)
+        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 'unset_cookie' == site:
+            page = 'no cookie to unset.'
+            if len(cookie_db) > 0:
+                self.unset_cookie(config['cookie_name'], config['cookie_path'])
+                page = 'cookie unset!'
+        else:
+            start_date = params.get_cookied('start')
+            end_date = params.get_cookied('end')
+            page = db.show_calendar(start_date, end_date)
+        if 'unset_cookie' != site:
+            self.set_cookie(config['cookie_name'], config['cookie_path'], cookie_db)
         self.send_HTML(page)
 
 
-if __name__ == "__main__":  
+if __name__ == "__main__":
     run_server(server_port, TodoHandler)