"""Tests for weekly-post pay calculation helpers."""

from datetime import datetime
from decimal import Decimal

# 2026-06-01 is a Monday. Day names come from the date, so a week may start any day.
WEEK_START = datetime(2026, 6, 1)
# Sunday that opens the week containing Monday 2026-06-01.
SUNDAY_WEEK = datetime(2026, 5, 31)


class TestAddShiftToPay:
    def test_assigned_shift_is_added(self, weeklypost_app, schedule, seed):
        seed.config(shift_rate="50")
        seed.weekly("Monday", "114", "Alice")
        breakdown, totals = [], {}
        weeklypost_app._add_shift_to_pay(
            schedule, breakdown, totals, datetime(2026, 6, 1), "Monday"
        )
        assert len(breakdown) == 1
        assert breakdown[0]["name"] == "Alice"
        assert breakdown[0]["rate"] == Decimal("50")
        assert totals["Alice"]["shifts"] == 1
        assert totals["Alice"]["total"] == Decimal("50")

    def test_available_shift_is_skipped(self, weeklypost_app, schedule, seed):
        seed.config(shift_rate="50")
        breakdown, totals = [], {}
        weeklypost_app._add_shift_to_pay(
            schedule, breakdown, totals, datetime(2026, 6, 1), "Monday"
        )
        assert breakdown == [] and totals == {}

    def test_weekend_day_label(self, weeklypost_app, schedule, seed):
        seed.config(shift_rate="50")
        seed.weekly("Saturday", "200", "Alice", shift_type="day")
        breakdown, totals = [], {}
        weeklypost_app._add_shift_to_pay(
            schedule, breakdown, totals, datetime(2026, 6, 6), "Saturday", "day"
        )
        assert breakdown[0]["day"] == "Sat (Day)"


class TestCalculateWeeklyPay:
    def test_single_weekday_shift(self, weeklypost_app, schedule, seed):
        seed.config(shift_rate="50")
        seed.weekly("Monday", "114", "Alice")
        record = weeklypost_app._calculate_weekly_pay(schedule, WEEK_START)
        assert record["week_start"] == "2026-06-01"
        assert len(record["breakdown"]) == 1
        assert record["totals"]["Alice"]["total"] == Decimal("50")

    def test_per_employee_rate_applied(self, weeklypost_app, schedule, seed):
        seed.config(shift_rate="50")
        seed.roster("114", "Alice", shift_rate="75")
        seed.weekly("Monday", "114", "Alice")
        record = weeklypost_app._calculate_weekly_pay(schedule, WEEK_START)
        assert record["totals"]["Alice"]["total"] == Decimal("75.0")

    def test_weekend_counts_day_and_night(self, weeklypost_app, schedule, seed):
        seed.config(shift_rate="50")
        seed.weekly("Saturday", "200", "Alice", shift_type="day")
        seed.weekly("Saturday", "200", "Alice", shift_type="night")
        record = weeklypost_app._calculate_weekly_pay(schedule, WEEK_START)
        # Alice worked both Saturday shifts → 2 shifts, $100.
        assert record["totals"]["Alice"]["shifts"] == 2
        assert record["totals"]["Alice"]["total"] == Decimal("100")

    def test_saturday_night_stays_in_week_ending_saturday(
        self, weeklypost_app, schedule, seed
    ):
        # Sat 2026-06-06 night runs into Sunday morning and stays on Saturday.
        # Sun 2026-06-07 day opens the next week. Sun 2026-05-31 day is this week.
        seed.config(shift_rate="50")
        seed.weekly("Saturday", "200", "Alice", shift_type="night")
        seed.weekly("Sunday", "201", "Bob", shift_type="day")
        record = weeklypost_app._calculate_weekly_pay(schedule, SUNDAY_WEEK)
        by_date = {line["date"]: line for line in record["breakdown"]}
        assert by_date["2026-06-06"]["name"] == "Alice"
        assert by_date["2026-06-06"]["day"].startswith("Sat")
        assert by_date["2026-05-31"]["name"] == "Bob"
        assert "2026-06-07" not in by_date

    def test_sunday_day_opens_the_next_week(self, weeklypost_app, schedule, seed):
        seed.config(shift_rate="50")
        seed.weekly("Saturday", "200", "Alice", shift_type="night")
        seed.weekly("Sunday", "201", "Bob", shift_type="day")
        record = weeklypost_app._calculate_weekly_pay(schedule, datetime(2026, 6, 7))
        by_date = {line["date"]: line for line in record["breakdown"]}
        assert by_date["2026-06-07"]["name"] == "Bob"
        assert by_date["2026-06-13"]["name"] == "Alice"
        assert "2026-06-06" not in by_date

    def test_empty_week_has_no_breakdown(self, weeklypost_app, schedule, seed):
        seed.config(shift_rate="50")
        record = weeklypost_app._calculate_weekly_pay(schedule, WEEK_START)
        assert record["breakdown"] == [] and record["totals"] == {}


class TestHolidayPay:
    def test_single_holiday_assignee(self, weeklypost_app, schedule, seed):
        # Wed 2026-06-03 holiday; one assignee at base $50 * 1.5 = $75.
        seed.config(shift_rate="50")
        seed.holiday(
            "2026-06-03",
            slots=2,
            label="Founders Day",
            assignees={"114": {"name": "Alice", "claimed_at": "x"}},
        )
        breakdown, totals = [], {}
        weeklypost_app._add_shift_to_pay(
            schedule, breakdown, totals, datetime(2026, 6, 3), "Wednesday", "day"
        )
        assert len(breakdown) == 1
        line = breakdown[0]
        assert line["name"] == "Alice"
        assert line["is_holiday"] is True
        assert line["holiday_label"] == "Founders Day"
        assert line["multiplier"] == Decimal("1.5")
        assert line["base_rate"] == Decimal("50")
        # rate is the effective (multiplied) pay for Slack-block compatibility.
        assert line["rate"] == Decimal("75.0")
        assert line["amount"] == Decimal("75.0")
        assert isinstance(line["multiplier"], Decimal)
        assert isinstance(line["amount"], Decimal)
        assert totals["Alice"]["shifts"] == 1
        assert totals["Alice"]["holiday_shifts"] == 1
        assert totals["Alice"]["total"] == Decimal("75.0")

    def test_two_assignees_same_holiday(self, weeklypost_app, schedule, seed):
        # Two slots filled on the same holiday; each paid base * 1.5.
        seed.config(shift_rate="40")
        seed.roster("114", "Alice", shift_rate="40")
        seed.roster("200", "Bob", shift_rate="60")
        seed.holiday(
            "2026-06-03",
            slots=2,
            label="Founders Day",
            assignees={
                "114": {"name": "Alice", "claimed_at": "x"},
                "200": {"name": "Bob", "claimed_at": "y"},
            },
        )
        breakdown, totals = [], {}
        weeklypost_app._add_shift_to_pay(
            schedule, breakdown, totals, datetime(2026, 6, 3), "Wednesday", "day"
        )
        assert len(breakdown) == 2
        assert all(line["is_holiday"] for line in breakdown)
        by_name = {line["name"]: line for line in breakdown}
        assert by_name["Alice"]["amount"] == Decimal("60.0")  # 40 * 1.5
        assert by_name["Bob"]["amount"] == Decimal("90.0")  # 60 * 1.5
        assert totals["Alice"]["total"] == Decimal("60.0")
        assert totals["Bob"]["total"] == Decimal("90.0")
        assert totals["Alice"]["holiday_shifts"] == 1
        assert totals["Bob"]["holiday_shifts"] == 1

    def test_custom_multiplier(self, weeklypost_app, schedule, seed):
        seed.config(shift_rate="50")
        seed.holiday(
            "2026-06-03",
            slots=1,
            label="Double Day",
            assignees={"114": {"name": "Alice", "claimed_at": "x"}},
            multiplier=Decimal("2"),
        )
        breakdown, totals = [], {}
        weeklypost_app._add_shift_to_pay(
            schedule, breakdown, totals, datetime(2026, 6, 3), "Wednesday", "day"
        )
        assert breakdown[0]["multiplier"] == Decimal("2")
        assert breakdown[0]["amount"] == Decimal("100")
        assert totals["Alice"]["total"] == Decimal("100")

    def test_empty_holiday_adds_nothing(self, weeklypost_app, schedule, seed):
        seed.config(shift_rate="50")
        seed.holiday("2026-06-03", slots=2, label="Empty", assignees={})
        breakdown, totals = [], {}
        weeklypost_app._add_shift_to_pay(
            schedule, breakdown, totals, datetime(2026, 6, 3), "Wednesday", "day"
        )
        assert breakdown == [] and totals == {}

    def test_mixed_week(self, weeklypost_app, schedule, seed):
        # A week with a weekday night shift, a weekend day+night, and a holiday.
        seed.config(shift_rate="50")
        # Regular Monday night for Alice.
        seed.weekly("Monday", "114", "Alice")
        # Holiday on Wednesday (day shift) with Alice + Bob.
        seed.roster("200", "Bob", shift_rate="50")
        seed.holiday(
            "2026-06-03",
            slots=2,
            label="Founders Day",
            assignees={
                "114": {"name": "Alice", "claimed_at": "x"},
                "200": {"name": "Bob", "claimed_at": "y"},
            },
        )
        # Saturday day + night for Bob (regular weekend).
        seed.weekly("Saturday", "200", "Bob", shift_type="day")
        seed.weekly("Saturday", "200", "Bob", shift_type="night")

        record = weeklypost_app._calculate_weekly_pay(schedule, WEEK_START)

        # Alice: Mon night $50 + Wed holiday $75 = $125 over 2 shifts.
        assert record["totals"]["Alice"]["shifts"] == 2
        assert record["totals"]["Alice"]["total"] == Decimal("125.0")
        assert record["totals"]["Alice"]["holiday_shifts"] == 1
        # Bob: Wed holiday $75 + Sat day $50 + Sat night $50 = $175 over 3 shifts.
        assert record["totals"]["Bob"]["shifts"] == 3
        assert record["totals"]["Bob"]["total"] == Decimal("175.0")
        assert record["totals"]["Bob"]["holiday_shifts"] == 1
        # Exactly two holiday breakdown lines (Alice + Bob on Wed).
        holiday_lines = [b for b in record["breakdown"] if b.get("is_holiday")]
        assert len(holiday_lines) == 2
        assert {line["name"] for line in holiday_lines} == {"Alice", "Bob"}

    def test_night_on_holiday_date_is_regular(self, weeklypost_app, schedule, seed):
        # A holiday only applies to the day shift; night falls through to weekly.
        seed.config(shift_rate="50")
        seed.weekly("Wednesday", "114", "Alice")
        seed.holiday(
            "2026-06-03",
            slots=1,
            label="Founders Day",
            assignees={"200": {"name": "Bob", "claimed_at": "y"}},
        )
        breakdown, totals = [], {}
        weeklypost_app._add_shift_to_pay(
            schedule, breakdown, totals, datetime(2026, 6, 3), "Wednesday", "night"
        )
        assert len(breakdown) == 1
        assert breakdown[0]["name"] == "Alice"
        assert breakdown[0].get("is_holiday") is None
        assert breakdown[0]["amount"] == Decimal("50")