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

from datetime import datetime
from decimal import Decimal

# 2026-06-01 is a Monday — required so DAY_ORDER lines up with real weekdays.
WEEK_START = datetime(2026, 6, 1)


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_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 TestBuildPayEmailHtml:
    def test_renders_totals_rows(self, weeklypost_app):
        pay_record = {
            "totals": {
                "Alice": {"total": Decimal("100"), "rate": Decimal("50"), "shifts": 2}
            }
        }
        html = weeklypost_app._build_pay_email_html("Jun 1 to Jun 7", pay_record)
        assert "Jun 1 to Jun 7" in html
        assert "Alice" in html
        assert "$100.00" in html