<?php

use App\Services\Forecasting\UkBankHolidays;
use Carbon\Carbon;

it('returns 8 statutory bank holidays per year', function () {
    expect(UkBankHolidays::forYear(2024))->toHaveCount(8)
        ->and(UkBankHolidays::forYear(2025))->toHaveCount(8);
});

it('computes Easter Monday correctly for 2024 (Apr 1)', function () {
    $dates = array_map(fn ($d): string => $d->toDateString(), UkBankHolidays::forYear(2024));
    expect($dates)->toContain('2024-04-01'); // Easter Monday
    expect($dates)->toContain('2024-03-29'); // Good Friday
});

it('computes the floating Mondays for 2024 correctly', function () {
    $dates = array_map(fn ($d): string => $d->toDateString(), UkBankHolidays::forYear(2024));
    expect($dates)->toContain('2024-05-06'); // First Mon of May (Early May)
    expect($dates)->toContain('2024-05-27'); // Last Mon of May (Spring)
    expect($dates)->toContain('2024-08-26'); // Last Mon of August (Summer)
});

it('substitutes Christmas Day forward when it falls on a weekend (2022)', function () {
    // 2022: Christmas was a Sunday, Boxing Day Monday → Christmas observed Tue Dec 27, Boxing observed Mon Dec 26.
    $dates = array_map(fn ($d): string => $d->toDateString(), UkBankHolidays::forYear(2022));
    expect($dates)->toContain('2022-12-26') // Boxing
        ->and($dates)->toContain('2022-12-27'); // Christmas substituted
});

it('returns true when a target Monday is itself a bank holiday (Easter Monday 2024)', function () {
    $monday = Carbon::parse('2024-04-01');
    expect(UkBankHolidays::holidayWithin($monday, 7))->toBeTrue();
});

it('returns true when a bank holiday falls within the next 7 days', function () {
    // Mon 2024-04-01 is Easter Monday. The Monday before (2024-03-25) is pre-bank-holiday week.
    $weekBefore = Carbon::parse('2024-03-25');
    expect(UkBankHolidays::holidayWithin($weekBefore, 7))->toBeTrue();
});

it('returns false for a quiet stretch with no holidays in the window', function () {
    // Mid-July 2024 — no UK bank holidays in this 7-day window.
    $monday = Carbon::parse('2024-07-15');
    expect(UkBankHolidays::holidayWithin($monday, 7))->toBeFalse();
});

it('handles a window that crosses a year boundary', function () {
    // Mon 2024-12-30 → window includes New Year's Day 2025 (Wed Jan 1).
    $monday = Carbon::parse('2024-12-30');
    expect(UkBankHolidays::holidayWithin($monday, 7))->toBeTrue();
});