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# date_calculator.py
from datetime import datetime, timedelta
from dateutil.relativedelta import relativedelta
import math
class DateCalculator:
@staticmethod
def truncate_periods(periods, launch, prediction):
considered_periods = []
for start, end, id in periods:
# print(start)
# print(launch)
truncated_start = max(start, launch)
if truncated_start <= end:
considered_periods.append((truncated_start, end, id))
return considered_periods
@staticmethod
def round_periods(periods):
rounded_periods = []
total_months = 0
for start, end, id in periods:
year_diff = end.year - start.year
month_diff = end.month - start.month
months = year_diff * 12 + month_diff
if end.day >= start.day:
months += 1
rounded_end = start + relativedelta(months=months) - timedelta(days=1)
rounded_periods.append((start, rounded_end, id))
total_months += months
return rounded_periods, total_months
@staticmethod
def adjust_periods(periods):
"""Adjust overlapping periods without merging.
- Later periods overlapping with a previous one have their start moved to the previous end + 1 day.
- Periods fully contained in a previous one are discarded.
"""
if not periods:
return []
# Sort by start date, then end date for stability
periods = sorted(periods, key=lambda p: (p[0], p[1]))
adjusted = []
for start, end, pid in periods:
if not adjusted:
adjusted.append((start, end, pid))
continue
last_start, last_end, last_pid = adjusted[-1]
if start <= last_end:
# Fully contained in previous period → discard
if end <= last_end:
continue
# Overlaps head; push start to the day after last_end
new_start = last_end + timedelta(days=1)
if new_start <= end:
adjusted.append((new_start, end, pid))
# else new_start > end → discard
else:
adjusted.append((start, end, pid))
return adjusted
@staticmethod
def find_non_overlapping_periods(existing_periods, test_period):
existing_periods.sort(key=lambda x: x[0])
test_start, test_end, id = test_period
non_overlapping_periods = []
for start, end, _ in existing_periods:
if test_end < start:
non_overlapping_periods.append((test_start, test_end, id))
return non_overlapping_periods
elif test_start > end:
continue
else:
if test_start < start:
non_overlapping_periods.append((test_start, start - timedelta(days=1), id))
test_start = end + timedelta(days=1)
if test_start <= test_end:
non_overlapping_periods.append((test_start, test_end, id))
return non_overlapping_periods
def calculate_prediction(self, launch_date, duration, **kwargs):
total_days = 0
total_months = 0
updated = True
prediction_start = launch_date + duration - timedelta(days = 1)
prediction = prediction_start
events = []
half_projects = []
full_projects = []
other_kwargs = {}
for k, v in kwargs.items():
if k == "Sonstige":
events.extend(v)
elif k == "EZ 50%":
half_projects.extend(v)
elif k == "EZ 100%":
full_projects.extend(v)
elif k == "EZ pauschal":
full_projects.extend(v)
else:
other_kwargs[k] = v
while updated:
updated = False
considered_events = self.truncate_periods(events, launch_date, prediction)
considered_full_projects = self.truncate_periods(full_projects, launch_date, prediction)
considered_half_projects = self.truncate_periods(half_projects, launch_date, prediction)
considered_full_projects_merged = self.adjust_periods(considered_full_projects)
considered_full_projects_rounded, months = self.round_periods(considered_full_projects_merged)
considered_full_projects_merged2 = self.adjust_periods(considered_full_projects_rounded)
considered_full_projects_rounded2, months = self.round_periods(considered_full_projects_merged2)
non_overlapping_half_projects = []
for test_interval in considered_half_projects:
non_overlapping_half_projects.extend(
self.find_non_overlapping_periods(considered_full_projects_rounded2, test_interval)
)
considered_half_projects_merged = self.adjust_periods(non_overlapping_half_projects)
considered_half_projects_rounded, months2 = self.round_periods(considered_half_projects_merged)
considered_half_projects_merged2 = self.adjust_periods(considered_half_projects_rounded)
considered_half_projects_rounded2, months2 = self.round_periods(considered_half_projects_merged2)
all_projects_merged = self.adjust_periods(
considered_full_projects_rounded2 + considered_half_projects_rounded2
)
merged_event_periods = self.adjust_periods(considered_events)
non_overlapping_event_periods = []
for test_interval in merged_event_periods:
non_overlapping_event_periods.extend(
self.find_non_overlapping_periods(all_projects_merged, test_interval)
)
new_total_months = months + math.ceil(months2 / 2)
new_total_days = sum((end - start).days + 1 for start, end, _ in non_overlapping_event_periods)
if new_total_days != total_days or new_total_months != total_months:
total_days = new_total_days
total_months = new_total_months
updated = True
prediction = launch_date + duration + relativedelta(months=total_months) + timedelta(days=total_days-1)
# print(prediction, prediction_start + relativedelta(years = 6))
if prediction > prediction_start + relativedelta(years = 6):
prediction = prediction_start + relativedelta(years = 6)
return prediction, considered_full_projects_rounded2 + considered_half_projects_rounded2 + non_overlapping_event_periods
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