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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)
truncated_end = min(end, prediction)
if truncated_start <= end and truncated_start <= prediction:
considered_periods.append((truncated_start, truncated_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 merge_periods(periods):
if not periods:
return []
periods.sort()
merged_periods = []
current_start, current_end, current_id = periods[0]
for start, end, id in periods[1:]:
if start <= current_end + timedelta(days=1):
current_end = max(current_end, end)
else:
merged_periods.append((current_start, current_end, current_id))
current_start, current_end, current_id = start, end, id
merged_periods.append((current_start, current_end, current_id))
return merged_periods
@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 == "event":
events.extend(v)
elif k == "half_project":
half_projects.extend(v)
elif k == "full_project":
full_projects.extend(v)
elif k == "two_years":
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.merge_periods(considered_full_projects)
considered_full_projects_rounded, months = self.round_periods(considered_full_projects_merged)
considered_full_projects_merged2 = self.merge_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.merge_periods(non_overlapping_half_projects)
considered_half_projects_rounded, months2 = self.round_periods(considered_half_projects_merged)
considered_half_projects_merged2 = self.merge_periods(considered_half_projects_rounded)
considered_half_projects_rounded2, months2 = self.round_periods(considered_half_projects_merged2)
all_projects_merged = self.merge_periods(
considered_full_projects_rounded2 + considered_half_projects_rounded2
)
merged_event_periods = self.merge_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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