<?php

declare(strict_types=1);

namespace App\Tests\Unit\Service;

use App\Enum\HalfDay;
use App\Service\AbsenceDayCalculator;
use App\Service\PublicHolidayProvider;
use DateTimeImmutable;
use PHPUnit\Framework\TestCase;

/**
 * @internal
 */
class AbsenceDayCalculatorTest extends TestCase
{
    private AbsenceDayCalculator $calculator;

    protected function setUp(): void
    {
        $this->calculator = new AbsenceDayCalculator(new PublicHolidayProvider());
    }

    public function testFullWeekIsFiveWorkingDays(): void
    {
        // Mon 2026-06-01 to Fri 2026-06-05, no holidays that week
        self::assertSame(5.0, $this->calculator->countWorkingDays(
            new DateTimeImmutable('2026-06-01'),
            new DateTimeImmutable('2026-06-05'),
        ));
    }

    public function testWeekendIsSkipped(): void
    {
        // Fri 2026-06-05 to Mon 2026-06-08 => Fri + Mon = 2
        self::assertSame(2.0, $this->calculator->countWorkingDays(
            new DateTimeImmutable('2026-06-05'),
            new DateTimeImmutable('2026-06-08'),
        ));
    }

    public function testHolidayIsSkipped(): void
    {
        // Thu 2026-05-07 to Fri 2026-05-08 (Victoire 1945) => Thu only = 1
        self::assertSame(1.0, $this->calculator->countWorkingDays(
            new DateTimeImmutable('2026-05-07'),
            new DateTimeImmutable('2026-05-08'),
        ));
    }

    public function testHalfDayStartSubtractsHalf(): void
    {
        self::assertSame(4.5, $this->calculator->countWorkingDays(
            new DateTimeImmutable('2026-06-01'),
            new DateTimeImmutable('2026-06-05'),
            HalfDay::Afternoon,
        ));
    }

    public function testBothHalfDaysSubtractOne(): void
    {
        self::assertSame(4.0, $this->calculator->countWorkingDays(
            new DateTimeImmutable('2026-06-01'),
            new DateTimeImmutable('2026-06-05'),
            HalfDay::Afternoon,
            HalfDay::Morning,
        ));
    }

    public function testSingleHalfDay(): void
    {
        self::assertSame(0.5, $this->calculator->countWorkingDays(
            new DateTimeImmutable('2026-06-01'),
            new DateTimeImmutable('2026-06-01'),
            HalfDay::Morning,
        ));
    }

    public function testWorkingDaysVsOpenDays(): void
    {
        // Fri 2026-06-05 to Mon 2026-06-08, "ouvrables" includes Saturday
        // => Fri + Sat + Mon = 3 (Sunday always skipped)
        self::assertSame(3.0, $this->calculator->countWorkingDays(
            new DateTimeImmutable('2026-06-05'),
            new DateTimeImmutable('2026-06-08'),
            null,
            null,
            false,
        ));
    }
}