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#!@python@/bin/python

import requests
from requests.auth import HTTPBasicAuth
from datetime import *
from xdg import (BaseDirectory)
import configparser
from uritools import uricompose

from dateutil.easter import *
from dateutil.tz import *
from dateutil.parser import isoparse

from enum import Enum

from math import (copysign, ceil)

class TogglAPISection(Enum):
    TOGGL = '/api/v8'
    REPORTS = '/reports/api/v2'

class TogglAPI(object):
    def __init__(self, api_token, workspace_id):
        self._api_token = api_token
        self._workspace_id = workspace_id

    def _make_url(self, api=TogglAPISection.TOGGL, section=['time_entries', 'current'], params={}):
        if api is TogglAPISection.REPORTS:
          params.update({'user_agent': 'worktime', 'workspace_id': self._workspace_id})

        api_path = api.value
        section_path = '/'.join(section)
        return uricompose(scheme='https', host='www.toggl.com', path=f"{api_path}/{section_path}", query=params)

    def _query(self, url, method):

        headers = {'content-type': 'application/json'}

        if method == 'GET':
            return requests.get(url, headers=headers, auth=HTTPBasicAuth(self._api_token, 'api_token'))
        elif method == 'POST':
            return requests.post(url, headers=headers, auth=HTTPBasicAuth(self._api_token, 'api_token'))
        else:
            raise ValueError(f"Undefined HTTP method “{method}”")

    def get_billable_hours(self, start_date, end_date=datetime.now(timezone.utc)):
        url = self._make_url(api = TogglAPISection.REPORTS, section = ['summary'], params={'since': start_date.astimezone(timezone.utc).isoformat(), 'until': end_date.astimezone(timezone.utc).isoformat()})
        r = self._query(url = url, method='GET')
        return timedelta(milliseconds=r.json()['total_billable'])

    def get_running_clock(self, now=datetime.now(timezone.utc)):
        url = self._make_url(api = TogglAPISection.TOGGL, section = ['time_entries', 'current'])
        r = self._query(url = url, method='GET').json()

        if not r or not r['data'] or not r['data']['billable']:
            return None

        start = isoparse(r['data']['start'])

        return now - start if start <= now else None

class Worktime(object):
    time_worked = timedelta()
    running_entry = None
    now = datetime.now(tzlocal())
    time_pulled_forward = timedelta()
    is_workday = False
    
    def __init__(self, start_datetime=None, end_datetime=None, now=None):
      if now:
        self.now = now
        
      config = configparser.ConfigParser()
      config_dir = BaseDirectory.load_first_config('worktime')
      config.read(f"{config_dir}/worktime.ini")
      api = TogglAPI(api_token=config['TOGGL']['ApiToken'], workspace_id=config['TOGGL']['Workspace'])
      date_format = config.get('WORKTIME', 'DateFormat', fallback='%Y-%m-%d')

      start_date = start_datetime or datetime.strptime(config['WORKTIME']['StartDate'], date_format).replace(tzinfo=tzlocal())
      end_date = end_datetime or self.now

      hours_per_week = float(config.get('WORKTIME', 'HoursPerWeek', fallback=40))
      workdays = set([int(d.strip()) for d in config.get('WORKTIME', 'Workdays', fallback='1,2,3,4,5').split(',')])
      time_per_day = timedelta(hours = hours_per_week) / len(workdays)

      holidays = dict()

      for year in range(start_date.year, end_date.year + 1):
          y_easter = datetime.combine(easter(year), time(), tzinfo=tzlocal())

          # Legal holidays in munich, bavaria
          holidays[datetime(year, 1, 1, tzinfo=tzlocal()).date()] = time_per_day
          holidays[datetime(year, 1, 6, tzinfo=tzlocal()).date()] = time_per_day
          holidays[(y_easter+timedelta(days=-2)).date()] = time_per_day
          holidays[(y_easter+timedelta(days=+1)).date()] = time_per_day
          holidays[datetime(year, 5, 1, tzinfo=tzlocal()).date()] = time_per_day
          holidays[(y_easter+timedelta(days=+39)).date()] = time_per_day
          holidays[(y_easter+timedelta(days=+50)).date()] = time_per_day
          holidays[(y_easter+timedelta(days=+60)).date()] = time_per_day
          holidays[datetime(year, 8, 15, tzinfo=tzlocal()).date()] = time_per_day
          holidays[datetime(year, 10, 3, tzinfo=tzlocal()).date()] = time_per_day
          holidays[datetime(year, 11, 1, tzinfo=tzlocal()).date()] = time_per_day
          holidays[datetime(year, 12, 25, tzinfo=tzlocal()).date()] = time_per_day
          holidays[datetime(year, 12, 26, tzinfo=tzlocal()).date()] = time_per_day

      try:
          with open(f"{config_dir}/excused", 'r') as excused:
              for line in excused:
                  stripped_line = line.strip()
                  if stripped_line:
                      splitLine = stripped_line.split(' ')
                      if len(splitLine) == 2:
                          [hours, date] = splitLine
                          day = datetime.strptime(date, date_format).replace(tzinfo=tzlocal()).date()
                          holidays[day] = timedelta(hours = float(hours))
                      else:
                          holidays[datetime.strptime(stripped_line, date_format).replace(tzinfo=tzlocal()).date()] = time_per_day
      except IOError as e:
          if e.errno != 2:
              raise e

      pull_forward = dict()

      try:
          with open(f"{config_dir}/pull-forward", 'r') as excused:
              for line in excused:
                  stripped_line = line.strip()
                  if stripped_line:
                      [hours, date] = stripped_line.split(' ')
                      day = datetime.strptime(date, date_format).replace(tzinfo=tzlocal()).date()
                      if day > end_date.date():
                        pull_forward[day] = timedelta(hours = float(hours))
      except IOError as e:
          if e.errno != 2:
              raise e
      

      days_to_work = dict()

      start_day = start_date.date()
      end_day = end_date.date()
      if pull_forward:
          end_day = max(end_day, max(list(pull_forward)))
          
      for day in [start_day + timedelta(days = x) for x in range(0, (end_day - start_day).days + 1)]:
          if day.isoweekday() in workdays:
              time_to_work = time_per_day
              if day in holidays.keys():
                time_to_work -= holidays[day]
              if time_to_work > timedelta():
                days_to_work[day] = time_to_work

      self.is_workday = self.now.date() in days_to_work

      self.time_to_work = sum([days_to_work[day] for day in days_to_work.keys() if day <= end_date.date()], timedelta())
      for day in list(pull_forward):
          days_forward = set([d for d in days_to_work.keys() if d >= end_date.date() and d < day and not d in pull_forward])
          hours_per_day_forward = pull_forward[day] / len(days_forward) if len(days_forward) > 0 else timedelta()
          days_forward.discard(end_date.date())
          self.time_pulled_forward += pull_forward[day] - hours_per_day_forward * len(days_forward)
      self.time_to_work += self.time_pulled_forward

      self.time_worked = api.get_billable_hours(start_date, self.now)
      self.running_entry = api.get_running_clock(self.now)

      if self.running_entry:
          self.time_worked += self.running_entry
          
def main():
    worktime = Worktime()

    def difference_string(difference):
      total_minutes_difference = round(difference / timedelta(minutes = 1))
      (hours_difference, minutes_difference) = divmod(abs(total_minutes_difference), 60)
      sign = '' if total_minutes_difference >= 0 else '-'

      difference_string = f"{sign}"
      if hours_difference != 0:
          difference_string += f"{hours_difference}h"
      if hours_difference == 0 or minutes_difference != 0:
          difference_string += f"{minutes_difference}m"

      return difference_string
     

    difference = worktime.time_to_work - worktime.time_worked
    total_minutes_difference = 5 * ceil(difference / timedelta(minutes = 5))

    if worktime.running_entry and abs(difference) < timedelta(days = 1) and (total_minutes_difference > 0 or abs(worktime.running_entry) >= abs(difference)) :
        clockout_time = worktime.now + difference
        clockout_time += (5 - clockout_time.minute % 5) * timedelta(minutes = 1)
        clockout_time = clockout_time.replace(second = 0, microsecond = 0)

        if total_minutes_difference >= 0:
          difference_string = difference_string(total_minutes_difference * timedelta(minutes = 1))
          print("{difference_string}/{clockout_time}".format(difference_string = difference_string, clockout_time = clockout_time.strftime("%H:%M")))
        else:
          difference_string = difference_string(abs(total_minutes_difference) * timedelta(minutes = 1))
          print("{clockout_time}/{difference_string}".format(difference_string = difference_string, clockout_time = clockout_time.strftime("%H:%M")))
    else:
        if worktime.running_entry:
            difference_string = difference_string(abs(total_minutes_difference) * timedelta(minutes = 1))
            indicator = '↘' if total_minutes_difference >= 0 else '↗' # '\u25b6'
                
            print(f"{indicator} {difference_string}")
        else:
            difference_string = difference_string(total_minutes_difference * timedelta(minutes = 1))
            if worktime.is_workday:
                print(difference_string)
            else:
                print(f"({difference_string})")

if __name__ == "__main__":
    sys.exit(main())