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Improve backup algorithm.
[misc] / ledger.py
1 import os
2 import jinja2
3 import decimal
4 from datetime import datetime, timedelta
5 from urllib.parse import parse_qs, urlparse
6 from plomlib import PlomDB, PlomException, run_server, PlomHandler 
7
8 server_port = 8082
9 db_path = '/home/plom/org/ledger2023.dat'
10
11 html_head = """
12 <style>
13 body { color: #000000; }
14 table { margin-bottom: 2em; }
15 th, td { text-align: left }
16 input[type=number] { text-align: right; font-family: monospace; }
17 .money { font-family: monospace; text-align: right; }
18 .comment { font-style: italic; color: #777777; }
19 .meta { font-size: 0.75em; color: #777777; }
20 .full_line_comment { display: block; white-space: nowrap; width: 0; }
21 </style>
22 <body>
23 <a href="{{prefix}}/ledger">ledger</a>
24 <a href="{{prefix}}/balance">balance</a>
25 <a href="{{prefix}}/add_free">add free</a>
26 <a href="{{prefix}}/add_structured">add structured</a>
27 <hr />
28 """
29 booking_html = """
30 <p id="{{nth}}"><a href="{{prefix}}#{{nth}}">{{date}}</a> {{desc}} <span class="comment">{{head_comment|e}}</span><br />
31 <span class="meta">[edit: <a href="{{prefix}}/add_structured?start={{start}}&end={{end}}">structured</a>
32 / <a href="{{prefix}}/add_free?start={{start}}&end={{end}}">free</a>
33 | copy:<a href="{{prefix}}/copy_structured?start={{start}}&end={{end}}">structured</a>
34 / <a href="{{prefix}}/copy_free?start={{start}}&end={{end}}">free</a>
35 | move {% if move_up %}<a href="{{prefix}}/move_up?start={{start}}&end={{end}}">up</a>{% else %}up{% endif %}/{% if move_down %}<a href="{{prefix}}/move_down?start={{start}}&end={{end}}">down</a>{% else %}down{% endif %}
36 | <a href="{{prefix}}/balance?stop={{nth+1}}">balance after</a>
37 ]</span>
38 <table>
39 {% for l in booking_lines %}
40 {% if l.acc %}
41 <tr><td>{{l.acc|e}}</td><td class="money">{{l.money|e}}</td><td class="comment">{{l.comment|e}}</td></tr>
42 {% else %}
43 <tr><td><div class="comment full_line_comment">{{l.comment|e}}</div></td></tr>
44 {% endif %}
45 {% endfor %}
46 </table></p>
47 """
48 add_form_header = """<form method="POST" action="{{action|e}}">
49 <input type="submit" name="check" value="check" />
50 <input type="submit" name="revert" value="revert" />
51 """
52 add_form_footer = """
53 <input type="hidden" name="start" value={{start}} />
54 <input type="hidden" name="end" value={{end}} />
55 <input type="submit" name="save" value="save!">
56 </form>
57 """
58 add_free_html = """<br />
59 <textarea name="booking" rows=10 cols=80>
60 {% for line in lines %}{{ line }}
61 {% endfor %}
62 </textarea>
63 """
64 add_structured_html = """
65 <input type="submit" name="add_taxes" value="add taxes" />
66 <input type="submit" name="add_taxes2" value="add taxes2" />
67 <input type="submit" name="add_sink" value="add sink" />
68 <br />
69 <input name="date" value="{{date|e}}" size=9 />
70 <input name="description" value="{{desc|e}}" list="descriptions" />
71 <textarea name="line_0_comment" rows=1 cols=20>{{head_comment|e}}</textarea>
72 <input type="submit" name="line_0_add" value="[+]" />
73 <br />
74 {% for line in booking_lines %}
75 <input name="line_{{line.i}}_account" value="{{line.acc|e}}" size=40 list="accounts" />
76 <input type="number" name="line_{{line.i}}_amount" step=0.01 value="{{line.amt}}" size=10 />
77 <input name="line_{{line.i}}_currency" value="{{line.curr|e}}" size=3 list="currencies" />
78 <input type="submit" name="line_{{line.i}}_delete" value="[x]" />
79 <input type="submit" name="line_{{line.i}}_delete_after" value="[XX]" />
80 <input type="submit" name="line_{{line.i}}_add" value="[+]" />
81 <textarea name="line_{{line.i}}_comment" rows=1 cols={% if line.comm_cols %}{{line.comm_cols}}{% else %}20{% endif %}>{{line.comment|e}}</textarea>
82 <br />
83 {% endfor %}
84 {% for name, items in datalist_sets.items() %}
85 <datalist id="{{name}}">
86 {% for item in items %}
87   <option value="{{item|e}}">{{item|e}}</option>
88 {% endfor %}
89 </datalist>
90 {% endfor %}
91 """
92
93
94 def apply_booking_to_account_balances(account_sums, account, currency, amount):
95     if not account in account_sums:
96         account_sums[account] = {currency: amount}
97     elif not currency in account_sums[account].keys():
98         account_sums[account][currency] = amount
99     else:
100         account_sums[account][currency] += amount
101
102
103 def bookings_to_account_tree(bookings):
104     account_sums = {}
105     for booking in bookings:
106         for account, changes in booking.account_changes.items():
107             for currency, amount in changes.items():
108                 apply_booking_to_account_balances(account_sums, account, currency, amount)
109     account_tree = {}
110     def collect_branches(account_name, path):
111         node = account_tree
112         path_copy = path[:]
113         while len(path_copy) > 0:
114             step = path_copy.pop(0)
115             node = node[step]
116         toks = account_name.split(":", maxsplit=1)
117         parent = toks[0]
118         if parent in node.keys():
119             child = node[parent]
120         else:
121             child = {}
122             node[parent] = child
123         if len(toks) == 2:
124             k, v = collect_branches(toks[1], path + [parent])
125             if k not in child.keys():
126                 child[k] = v
127             else:
128                 child[k].update(v)
129         return parent, child
130     for account_name in sorted(account_sums.keys()):
131         k, v = collect_branches(account_name, [])
132         if k not in account_tree.keys():
133             account_tree[k] = v
134         else:
135             account_tree[k].update(v)
136     def collect_totals(parent_path, tree_node):
137         for k, v in tree_node.items():
138             child_path = parent_path + ":" + k
139             for currency, amount in collect_totals(child_path, v).items():
140                 apply_booking_to_account_balances(account_sums, parent_path, currency, amount)
141         return account_sums[parent_path]
142     for account_name in account_tree.keys():
143         account_sums[account_name] = collect_totals(account_name, account_tree[account_name])
144     return account_tree, account_sums
145
146
147 def parse_lines(lines, validate_bookings=True):
148     inside_booking = False
149     date_string, description = None, None
150     booking_lines = []
151     start_line = 0
152     bookings = []
153     comments = []
154     lines = lines.copy() + [''] # to ensure a booking-ending last line
155     last_date = ''
156     for i, line in enumerate(lines):
157         prefix = f"line {i}"
158         # we start with the case of an utterly empty line
159         comments += [""]
160         stripped_line = line.rstrip()
161         if stripped_line == '':
162             if inside_booking:
163                 # assume we finished a booking, finalize, and commit to DB
164                 if len(booking_lines) < 2:
165                     raise PlomException(f"{prefix} booking ends to early")
166                 booking = Booking(date_string, description, booking_lines, start_line, validate_bookings)
167                 bookings += [booking]
168             # expect new booking to follow so re-zeroall booking data
169             inside_booking = False
170             date_string, description = None, None
171             booking_lines = []
172             continue
173         # if non-empty line, first get comment if any, and commit to DB
174         split_by_comment = stripped_line.split(sep=";", maxsplit=1)
175         if len(split_by_comment) == 2:
176             comments[i] = split_by_comment[1].lstrip()
177         # if pre-comment empty: if inside_booking, this must be a comment-only line so we keep it for later ledger-output to capture those comments; otherwise, no more to process for this line
178         non_comment = split_by_comment[0].rstrip()
179         if non_comment.rstrip() == '':
180              if inside_booking:
181                  booking_lines += ['']
182              continue
183         # if we're starting a booking, parse by first-line pattern
184         if not inside_booking:
185             start_line = i
186             toks = non_comment.split(maxsplit=1)
187             date_string = toks[0]
188             try:
189                 datetime.strptime(date_string, '%Y-%m-%d')
190             except ValueError:
191                 raise PlomException(f"{prefix} bad date string: {date_string}")
192             if last_date > date_string:
193                 raise PlomException(f"{prefix} out-of-order-date")
194             last_date = date_string
195             try:
196                 description = toks[1]
197             except IndexError:
198                 raise PlomException(f"{prefix} bad description: {description}")
199             inside_booking = True
200             booking_lines += [non_comment]
201             continue
202         # otherwise, read as transfer data
203         toks = non_comment.split()  # ignore specification's allowance of single spaces in names
204         if len(toks) > 3:
205             raise PlomException(f"{prefix} too many booking line tokens: {toks}")
206         amount, currency = None, None
207         account_name = toks[0]
208         if account_name[0] == '[' and account_name[-1] == ']':
209             # ignore specification's differentiation of "virtual" accounts
210             account_name = account_name[1:-1]
211         decimal_chars = ".-0123456789"
212         if len(toks) == 3:
213             i_currency = 1
214             try:
215                 amount = decimal.Decimal(toks[1])
216                 i_currency = 2
217             except decimal.InvalidOperation:
218                 try:
219                     amount = decimal.Decimal(toks[2])
220                 except decimal.InvalidOperation:
221                     raise PlomException(f"{prefix} no decimal number in: {toks[1:]}")
222             currency = toks[i_currency]
223             if currency[0] in decimal_chars:
224                 raise PlomException(f"{prefix} currency starts with int, dot, or minus: {currency}")
225         elif len(toks) == 2:
226             value = toks[1]
227             inside_amount = False
228             inside_currency = False
229             amount_string = ""
230             currency = ""
231             dots_counted = 0
232             for i, c in enumerate(value):
233                 if i == 0:
234                     if c in decimal_chars:
235                         inside_amount = True
236                     else:
237                         inside_currency = True
238                 if inside_currency:
239                     if c in decimal_chars and len(amount_string) == 0:
240                         inside_currency = False
241                         inside_amount = True
242                     else:
243                         currency += c
244                         continue
245                 if inside_amount:
246                     if c not in decimal_chars:
247                         if len(currency) > 0:
248                             raise PlomException(f"{prefix} amount has non-decimal chars: {value}")
249                         inside_currency = True
250                         inside_amount = False
251                         currency += c
252                         continue
253                     if c == '-' and len(amount_string) > 1:
254                         raise PlomException(f"{prefix} amount has non-start '-': {value}")
255                     if c == '.':
256                         if dots_counted > 1:
257                             raise PlomException(f"{prefix} amount has multiple dots: {value}")
258                         dots_counted += 1
259                     amount_string += c
260             if len(currency) == 0:
261                 raise PlomException(f"{prefix} currency missing: {value}")
262             if len(amount_string) > 0:
263                 amount = decimal.Decimal(amount_string)
264         booking_lines += [(account_name, amount, currency)]
265     if inside_booking:
266         raise PlomException(f"{prefix} last booking unfinished")
267     return bookings, comments
268
269
270 class Booking:
271
272     def __init__(self, date_string, description, booking_lines, start_line, process=True):
273         self.date_string = date_string
274         self.description = description
275         self.lines = booking_lines
276         self.start_line = start_line
277         if process:
278             self.validate_booking_lines()
279             self.sink = {}
280             self.account_changes = self.parse_booking_lines_to_account_changes()
281
282     def validate_booking_lines(self):
283         prefix = f"booking at line {self.start_line}"
284         sums = {}
285         empty_values = 0
286         for line in self.lines[1:]:
287             if line == '':
288                 continue
289             _, amount, currency = line
290             if amount is None:
291                 if empty_values > 0:
292                     raise PlomException(f"{prefix} relates more than one empty value of same currency {currency}")
293                 empty_values += 1
294                 continue
295             if currency not in sums:
296                 sums[currency] = 0
297             sums[currency] += amount
298         if empty_values == 0:
299             for k, v in sums.items():
300                 if v != 0:
301                     raise PlomException(f"{prefix} does not add up to zero / {k} {v}")
302         else:
303             sinkable = False
304             for k, v in sums.items():
305                 if v != 0:
306                     sinkable = True
307             if not sinkable:
308                 raise PlomException(f"{prefix} has empty value that cannot be filled")
309
310     def parse_booking_lines_to_account_changes(self):
311         account_changes = {}
312         debt = {}
313         sink_account = None
314         for line in self.lines[1:]:
315             if line == '':
316                 continue
317             account, amount, currency = line
318             if amount is None:
319                 sink_account = account
320                 continue
321             apply_booking_to_account_balances(account_changes, account, currency, amount)
322             if currency not in debt:
323                 debt[currency] = amount
324             else:
325                 debt[currency] += amount
326         if sink_account:
327             for currency, amount in debt.items():
328                 apply_booking_to_account_balances(account_changes, sink_account, currency, -amount)
329                 self.sink[currency] = -amount
330         return account_changes
331
332
333
334 class LedgerDB(PlomDB):
335
336     def __init__(self, prefix):
337         self.prefix = prefix 
338         self.bookings = []
339         self.comments = []
340         self.real_lines = []
341         super().__init__(db_path)
342         ret = parse_lines(self.real_lines)
343         self.bookings += ret[0]
344         self.comments += ret[1]
345
346     def read_db_file(self, f):
347         self.real_lines += [l.rstrip() for l in f.readlines()]
348
349     def get_lines(self, start, end):
350         return self.real_lines[start:end]
351
352     def write_db(self, text, mode='w'):
353         self.write_text_to_db(text)
354
355     def insert_at_date(self, lines, date):
356         start_at = len(self.real_lines)
357         for b in self.bookings:
358             if b.date_string >= date:
359                 start_at = b.start_line 
360                 break
361             elif b.date_string > date:
362                 break
363         if start_at == len(self.real_lines):
364             lines = [''] + lines
365         return self.write_lines_in_total_lines_at(self.real_lines, start_at, lines)
366
367     def update(self, start, end, lines, date):
368         total_lines = self.real_lines[:start] + self.real_lines[end:]
369         n_original_lines = end - start
370         start_at = len(total_lines)
371         for b in self.bookings:
372             if b.date_string == date:
373                 if start_at == len(total_lines) or b.start_line == start:
374                     start_at = b.start_line 
375                     if b.start_line > start:
376                         start_at -= n_original_lines
377             elif b.date_string > date:
378                 break
379         if start_at == len(total_lines):
380             lines = [''] + lines
381         return self.write_lines_in_total_lines_at(total_lines, start_at, lines)
382
383     def write_lines_in_total_lines_at(self, total_lines, start_at, lines):
384         total_lines = total_lines[:start_at] + lines + [''] + total_lines[start_at:]
385         _, _ = parse_lines(lines)
386         text = '\n'.join(total_lines)
387         self.write_db(text)
388         return start_at
389
390     def get_nth_for_booking_of_start_line(self, start_line):
391         nth = 0
392         for b in self.bookings:
393             if b.start_line >= start_line:
394                 break
395             nth += 1
396         return nth
397
398     def add_taxes(self, lines, finish=False):
399         ret = []
400         bookings, _ = parse_lines(lines)
401         date = bookings[0].date_string
402         acc_kk_add = 'Reserves:KrankenkassenBeitragsWachstum'
403         acc_kk_minimum = 'Reserves:Month:KrankenkassenDefaultBeitrag'
404         acc_kk = 'Expenses:KrankenKasse'
405         acc_est = 'Reserves:Einkommenssteuer'
406         acc_assets = 'Assets'
407         acc_buffer = 'Reserves:NeuAnfangsPuffer:Ausgaben'
408         last_monthbreak_assets = 0
409         last_monthbreak_est = 0
410         last_monthbreak_kk_minimum = 0
411         last_monthbreak_kk_add = 0
412         buffer_expenses = 0
413         kk_expenses = 0
414         est_expenses = 0
415         months_passed = -int(finish) 
416         for b in self.bookings:
417             if date == b.date_string:
418                 break
419             acc_keys = b.account_changes.keys()
420             if acc_buffer in acc_keys:
421                 buffer_expenses -= b.account_changes[acc_buffer]['€']
422             if acc_kk_add in acc_keys:
423                 kk_expenses += b.account_changes[acc_kk_add]['€']
424             if acc_kk in acc_keys:
425                 kk_expenses += b.account_changes[acc_kk]['€']
426             if acc_est in acc_keys:
427                 est_expenses += b.account_changes[acc_est]['€']
428             if acc_kk_add in acc_keys and acc_kk_minimum in acc_keys:
429                 months_passed += 1
430                 if finish:
431                     last_monthbreak_kk_add = b.account_changes[acc_kk_add]['€']
432                     last_monthbreak_est = b.account_changes[acc_est]['€']
433                     last_monthbreak_kk_minimum = b.account_changes[acc_kk_minimum]['€']
434                     last_monthbreak_assets = b.account_changes[acc_buffer]['€']
435         old_needed_income_before_anything = - last_monthbreak_assets - last_monthbreak_kk_add - last_monthbreak_kk_minimum - last_monthbreak_est
436         if finish:
437             ret += [f'  {acc_est}  {-last_monthbreak_est}€ ; for old assumption of needed income: {old_needed_income_before_anything}€']
438         _, account_sums = bookings_to_account_tree(bookings)
439         expenses_so_far = -1 * account_sums[acc_assets]['€'] + old_needed_income_before_anything
440         needed_income_before_kk = expenses_so_far
441         ESt_this_month = 0
442         left_over = needed_income_before_kk - ESt_this_month
443         too_low = 0
444         too_high = 2 * needed_income_before_kk
445         E0 = decimal.Decimal(10908)
446         E1 = decimal.Decimal(15999)
447         E2 = decimal.Decimal(62809)
448         E3 = decimal.Decimal(277825)
449         while True:
450             zvE = buffer_expenses - kk_expenses + (12 - months_passed) * needed_income_before_kk
451             if finish:
452                 zvE += last_monthbreak_assets + last_monthbreak_kk_add + last_monthbreak_kk_minimum
453             if zvE < E0:
454                 ESt = decimal.Decimal(0)
455             elif zvE < E1:
456                 y = (zvE - E0)/10000
457                 ESt = (decimal.Decimal(979.18) * y + 1400) * y
458             elif zvE < E2:
459                 y = (zvE - E1)/10000
460                 ESt = (decimal.Decimal(192.59) * y + 2397) * y + decimal.Decimal(966.53)
461             elif zvE < E3:
462                 ESt = decimal.Decimal(0.42) * (zvE - decimal.Decimal(62809))  + decimal.Decimal(16405.54)
463             else:
464                 ESt = decimal.Decimal(0.45) * (zvE - decimal.Decimal(277825)) + decimal.Decimal(106713.52)
465             ESt_this_month = (ESt + last_monthbreak_est - est_expenses) / (12 - months_passed)
466             left_over = needed_income_before_kk - ESt_this_month
467             if abs(left_over - expenses_so_far) < 0.001:
468                 break
469             elif left_over < expenses_so_far:
470                 too_low = needed_income_before_kk
471             elif left_over > expenses_so_far:
472                 too_high = needed_income_before_kk
473             needed_income_before_kk = too_low + (too_high - too_low)/2
474         ESt_this_month = ESt_this_month.quantize(decimal.Decimal('0.00'))
475         ret += [f'  {acc_est}  {ESt_this_month}€ ; expenses so far: {expenses_so_far:.2f}€; zvE: {zvE:.2f}€; ESt total: {ESt:.2f}€; needed before Krankenkasse: {needed_income_before_kk:.2f}€']
476         kk_minimum_income = 1131.67
477         if date < '2023-02-01':
478             kk_minimum_income = decimal.Decimal(1096.67)
479             kk_factor = decimal.Decimal(0.189)
480             kk_minimum_tax = decimal.Decimal(207.27).quantize(decimal.Decimal('0.00'))
481         elif date < '2023-08-01':
482             kk_factor = decimal.Decimal(0.191)
483             kk_minimum_tax = decimal.Decimal(216.15).quantize(decimal.Decimal('0.00'))
484         else:
485             kk_factor = decimal.Decimal(0.197)
486             kk_minimum_tax = decimal.Decimal(222.94).quantize(decimal.Decimal('0.00'))
487         kk_add_so_far = account_sums[acc_kk_add]['€'] if acc_kk_add in account_sums.keys() else 0
488         kk_add = needed_income_before_kk / (1 - kk_factor) - needed_income_before_kk - kk_minimum_tax
489         hit_kk_minimum_income_limit = False
490         if kk_add_so_far + kk_add < 0:
491             hit_kk_minimum_income_limit = True 
492             kk_add_uncorrect = kk_add
493             kk_add = -(kk_add + kk_add_so_far) 
494         kk_add = decimal.Decimal(kk_add).quantize(decimal.Decimal('0.00'))
495         if finish:
496             ret += [f'  {acc_kk_add}  {-last_monthbreak_kk_add}€  ; for old assumption of needed income']
497         else:
498             ret += [f'  {acc_kk_minimum}  {kk_minimum_tax}€  ; assumed minimum income {kk_minimum_income:.2f}€ * {kk_factor:.3f}']
499         if hit_kk_minimum_income_limit:
500             ret += [f'  {acc_kk_add}  {kk_add}€  ; {needed_income_before_kk:.2f}€ / (1 - {kk_factor:.3f}) - {needed_income_before_kk:.2f}€ - {kk_minimum_tax}€ = {kk_add_uncorrect:.2f}€ would reduce current {acc_kk_dd} ({kk_add_so_far:.2f}€) below 0']
501         else:
502             ret += [f'  {acc_kk_add}  {kk_add}€  ; {needed_income_before_kk:.2f}€ / (1 - {kk_factor:.3f}) - {needed_income_before_kk:.2f}€ - {kk_minimum_tax}€']
503         diff = - last_monthbreak_est + ESt_this_month - last_monthbreak_kk_add + kk_add
504         if not finish:
505             diff += kk_minimum_tax
506         final_minus = expenses_so_far - old_needed_income_before_anything + diff
507         ret += [f'  {acc_assets}  {-diff} €']
508         ret += [f'  {acc_assets}  {final_minus} €']
509         year_needed = buffer_expenses + final_minus + (12 - months_passed - 1) * final_minus 
510         if finish:
511             ret += [f'  {acc_buffer}  {-final_minus} €']
512         else:
513             ret += [f'  {acc_buffer}  {-final_minus} € ; assume as to earn in year: {acc_buffer} + {12 - months_passed - 1} * this = {year_needed}']
514         return ret
515
516     def ledger_as_html(self):
517         booking_tmpl = jinja2.Template(booking_html)
518         single_c_tmpl = jinja2.Template('<span class="comment">{{c|e}}</span><br />')  ##
519         elements_to_write = []
520         last_i = i = 0  ##
521         for nth, booking in enumerate(self.bookings):
522             move_up = nth > 0 and self.bookings[nth - 1].date_string == booking.date_string
523             move_down = nth < len(self.bookings) - 1 and self.bookings[nth + 1].date_string == booking.date_string
524             booking_end = last_i = booking.start_line + len(booking.lines)
525             booking_lines = []
526             i = booking.start_line  ##
527             elements_to_write += [single_c_tmpl.render(c=c) for c in self.comments[last_i:i] if c != '']  ##
528             for booking_line in booking.lines[1:]:
529                  i += 1  ##
530                  comment = self.comments[i]  ##
531                  if booking_line == '':
532                      booking_lines += [{'acc': None, 'money': None, 'comment': comment}]  ##
533                      continue
534                  account = booking_line[0]
535                  money = ''
536                  if booking_line[1] is not None:
537                      money = f'{booking_line[1]} {booking_line[2]}'
538                  booking_lines += [{'acc': booking_line[0], 'money':money, 'comment':comment}]  ##
539             elements_to_write += [booking_tmpl.render(
540                 prefix=self.prefix,
541                 nth=nth,
542                 start=booking.start_line,
543                 end=booking_end,
544                 date=booking.date_string,
545                 desc=booking.description,
546                 head_comment=self.comments[booking.start_line],
547                 move_up=move_up,
548                 move_down=move_down,
549                 booking_lines = booking_lines)]
550         elements_to_write += [single_c_tmpl.render(c=c) for c in self.comments[last_i:] if c != '']  #
551         return '\n'.join(elements_to_write)
552
553     def balance_as_html(self, until=None):
554         bookings = self.bookings[:until if until is None else int(until)]
555         lines = []
556         account_tree, account_sums = bookings_to_account_tree(bookings)
557         def print_subtree(lines, indent, node, subtree, path):
558             line = f"{indent}{node}"
559             n_tabs = 5 - (len(line) // 8)
560             line += n_tabs * "\t"
561             if "€" in account_sums[path + node].keys():
562                 amount = account_sums[path + node]["€"]
563                 line += f"{amount:9.2f} €\t"
564             else:
565                 line += f"\t\t"
566             for currency, amount in account_sums[path + node].items():
567                 if currency != '€' and amount > 0:
568                     line += f"{amount:5.2f} {currency}\t"
569             lines += [line]
570             indent += "  "
571             for k, v in sorted(subtree.items()):
572                 print_subtree(lines, indent, k, v, path + node + ":")
573         for k, v in sorted(account_tree.items()):
574             print_subtree(lines, "", k, v, "")
575         content = "\n".join(lines)
576         return f"<pre>{content}</pre>"
577
578     def add_free(self, start=0, end=0, copy=False):
579         tmpl = jinja2.Template(add_form_header + add_free_html + add_form_footer) 
580         lines = self.get_lines(start, end)
581         if copy:
582             start = end = 0
583         return tmpl.render(action=self.prefix + '/add_free', start=start, end=end, lines=lines)
584
585     def add_structured(self, start=0, end=0, copy=False, temp_lines=[], add_empty_line=None):
586         tmpl = jinja2.Template(add_form_header + add_structured_html + add_form_footer) 
587         lines = temp_lines if len(''.join(temp_lines)) > 0 else self.get_lines(start, end)
588         bookings, comments = parse_lines(lines, validate_bookings=False)
589         if len(bookings) > 1:
590             raise PlomException('can only structurally edit single Booking')
591         if add_empty_line is not None:
592             comments = comments[:add_empty_line+1] + [''] + comments[add_empty_line+1:]
593             booking = bookings[0]
594             booking.lines = booking.lines[:add_empty_line+1] + [''] + booking.lines[add_empty_line+1:]
595         action = self.prefix + '/add_structured'
596         datalist_sets = {'descriptions': set(), 'accounts': set(), 'currencies': set()}
597         for b in self.bookings:
598             datalist_sets['descriptions'].add(b.description)
599             for account, moneys in b.account_changes.items():
600                 datalist_sets['accounts'].add(account)
601                 for currency in moneys.keys():
602                     datalist_sets['currencies'].add(currency)
603         content = ''
604         today = str(datetime.now())[:10]
605         booking_lines = []
606         if copy:
607             start = end = 0
608         desc = head_comment = ''
609         if len(bookings) == 0:
610             for i in range(1, 8):
611                 booking_lines += [{'i': i, 'acc': '', 'amt': '', 'curr': '€', 'comment': ''}]
612             date=today
613         else:
614             booking = bookings[0]
615             desc = booking.description
616             date = today if copy else booking.date_string
617             head_comment=comments[0]
618             last_line = len(comments)
619             for i in range(1, len(comments)):
620                 account = amount = currency = ''
621                 if i < len(booking.lines) and booking.lines[i] != '':
622                     account = booking.lines[i][0]
623                     amount = booking.lines[i][1]
624                     currency = booking.lines[i][2]
625                 booking_lines += [{
626                         'i': i,
627                         'acc': account,
628                         'amt': amount,
629                         'curr': currency if currency else '€',
630                         'comment': comments[i],
631                         'comm_cols': len(comments[i])}]
632         content += tmpl.render(
633                 action=action,
634                 date=date,
635                 desc=desc,
636                 head_comment=head_comment,
637                 booking_lines=booking_lines,
638                 datalist_sets=datalist_sets,
639                 start=start,
640                 end=end)
641         return content
642
643     def move_up(self, start, end):
644         prev_booking = None
645         for redir_nth, b in enumerate(self.bookings):
646             if b.start_line >= start:
647                 break
648             prev_booking = b
649         start_at = prev_booking.start_line 
650         self.make_move(start, end, start_at)
651         return redir_nth - 1
652
653     def move_down(self, start, end):
654         next_booking = None
655         for redir_nth, b in enumerate(self.bookings):
656             if b.start_line > start:
657                 next_booking = b
658                 break
659         start_at = next_booking.start_line + len(next_booking.lines) - (end - start) + 1 
660         self.make_move(start, end, start_at)
661         return redir_nth
662
663     def make_move(self, start, end, start_at):
664         lines = self.get_lines(start, end)
665         total_lines = self.real_lines[:start] + self.real_lines[end:]
666         self.write_lines_in_total_lines_at(total_lines, start_at, lines)
667
668     def booking_lines_from_postvars(self, postvars):
669         add_empty_line = None
670         date = postvars['date'][0]
671         description = postvars['description'][0]
672         start_comment = postvars['line_0_comment'][0]
673         start_line = f'{date} {description}'
674         if start_comment.rstrip() != '':
675             start_line += f' ; {start_comment}' 
676         lines = [start_line]
677         if 'line_0_add' in postvars.keys():
678             add_empty_line = 0
679         i = j = 1
680         while f'line_{i}_comment' in postvars.keys():
681             if f'line_{i}_delete' in postvars.keys():
682                 i += 1
683                 continue
684             elif f'line_{i}_delete_after' in postvars.keys():
685                 break 
686             elif f'line_{i}_add' in postvars.keys():
687                 add_empty_line = j
688             account = postvars[f'line_{i}_account'][0]
689             amount = postvars[f'line_{i}_amount'][0]
690             currency = postvars[f'line_{i}_currency'][0]
691             comment = postvars[f'line_{i}_comment'][0]
692             i += 1
693             new_main = f'  {account}  {amount}'
694             if '' == new_main.rstrip() == comment.rstrip():  # don't write empty lines, ignore currency if nothing else set
695                 continue
696             if len(amount.rstrip()) > 0:
697                 new_main += f' {currency}'
698             j += 1
699             new_line = new_main
700             if comment.rstrip() != '':
701                 new_line += f'  ; {comment}'
702             lines += [new_line]
703         if 'add_sink' in postvars.keys():
704             temp_lines = lines.copy() + ['_']
705             try:
706                 temp_bookings, _ = parse_lines(temp_lines)
707                 for currency in temp_bookings[0].sink:
708                     amount = temp_bookings[0].sink[currency]
709                     lines += [f'Assets  {amount:.2f} {currency}']
710             except PlomException:
711                 pass
712         if 'add_taxes' in postvars.keys():
713             lines += self.add_taxes(lines, finish=False)
714         elif 'add_taxes2' in postvars.keys():
715             lines += self.add_taxes(lines, finish=True)
716         return lines, add_empty_line
717
718
719
720 class LedgerHandler(PlomHandler):
721     
722     def app_init(self, handler):
723         default_path = '/ledger'
724         handler.add_route('GET', default_path, self.forward_gets) 
725         handler.add_route('POST', default_path, self.forward_posts) 
726         return 'ledger', default_path 
727
728     def do_POST(self):
729         self.try_do(self.forward_posts)
730
731     def forward_posts(self):
732         prefix = self.apps['ledger'] if hasattr(self, 'apps') else '' 
733         parsed_url = urlparse(self.path)
734         length = int(self.headers['content-length'])
735         postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
736         print("DEBUG", postvars['start'], postvars['end'])
737         start = int(postvars['start'][0])
738         end = int(postvars['end'][0])
739         db = LedgerDB(prefix)
740         add_empty_line = None
741         lines = []
742         # get inputs
743         if prefix + '/add_structured' == parsed_url.path and not 'revert' in postvars.keys():
744             lines, add_empty_line = db.booking_lines_from_postvars(postvars) 
745         elif prefix + '/add_free' == parsed_url.path and not 'revert' in postvars.keys():
746             lines = postvars['booking'][0].splitlines()
747         # validate where appropriate
748         if ('save' in postvars.keys()) or ('check' in postvars.keys()):
749             _, _ = parse_lines(lines)
750         # if saving, process where to and where to redirect after
751         if 'save' in postvars.keys():
752             last_date = str(datetime.now())[:10]
753             if len(db.bookings) > 0:
754                 last_date = db.bookings[-1].date_string
755             target_date = last_date[:] 
756             first_line_tokens = lines[0].split() if len(lines) > 0 else ''
757             first_token = first_line_tokens[0] if len(first_line_tokens) > 0 else ''
758             try:
759                 datetime.strptime(first_token, '%Y-%m-%d')
760                 target_date = first_token
761             except ValueError:
762                  pass
763             if start == end == 0:
764                 start = db.insert_at_date(lines, target_date)
765                 nth = db.get_nth_for_booking_of_start_line(start) 
766             else:
767                 new_start = db.update(start, end, lines, target_date)
768                 nth = db.get_nth_for_booking_of_start_line(new_start)
769                 if new_start > start: 
770                     nth -= 1 
771             self.redirect(prefix + f'/#{nth}')
772         # otherwise just re-build editing form
773         else:
774             if prefix + '/add_structured' == parsed_url.path: 
775                 edit_content = db.add_structured(start, end, temp_lines=lines, add_empty_line=add_empty_line)
776             else:
777                 edit_content = db.add_free(start, end)
778             header = jinja2.Template(html_head).render(prefix=prefix)
779             self.send_HTML(header + edit_content)
780
781     def do_GET(self):
782         self.try_do(self.forward_gets)
783
784     def forward_gets(self):
785         prefix = self.apps['ledger'] if hasattr(self, 'apps') else '' 
786         parsed_url = urlparse(self.path)
787         params = parse_qs(parsed_url.query)
788         start = int(params.get('start', ['0'])[0])
789         end = int(params.get('end', ['0'])[0])
790         db = LedgerDB(prefix=prefix)
791         if parsed_url.path == prefix + '/balance':
792             stop = params.get('stop', [None])[0]
793             page = db.balance_as_html(stop)
794         elif parsed_url.path == prefix + '/add_free':
795             page = db.add_free(start, end)
796         elif parsed_url.path == prefix + '/add_structured':
797             page = db.add_structured(start, end)
798         elif parsed_url.path == prefix + '/copy_free':
799             page = db.add_free(start, end, copy=True)
800         elif parsed_url.path == prefix + '/copy_structured':
801             page = db.add_structured(start, end, copy=True)
802         elif parsed_url.path == prefix + '/move_up':
803             nth = db.move_up(start, end)
804             self.redirect(prefix + f'/#{nth}')
805             return
806         elif parsed_url.path == prefix + '/move_down':
807             nth = db.move_down(start, end)
808             self.redirect(prefix + f'/#{nth}')
809             return
810         else:
811             page = db.ledger_as_html()
812         header = jinja2.Template(html_head).render(prefix=prefix)
813         self.send_HTML(header + page)
814
815
816
817 if __name__ == "__main__":  
818     run_server(server_port, LedgerHandler)