<?php

namespace Tests\Unit\Scheduling;

use App\Enums\EventState;
use App\Models\User;
use App\Scheduling\Due;
use App\Scheduling\WindowResolver;
use Carbon\CarbonImmutable;
use Tests\TestCase; // Laravel TestCase: Eloquent date-casts need the connection grammar even in memory

class WindowResolverTest extends TestCase
{
    private User $user;
    private WindowResolver $windows;

    protected function setUp(): void
    {
        parent::setUp();
        $this->user = new User(['login' => 'n', 'tz' => 'UTC', 'quiet_start' => '22:00:00', 'quiet_end' => '09:00:00']);
        $this->windows = new WindowResolver(30, 10, [9, 14, 20]);
    }

    private function at(string $s): CarbonImmutable
    {
        return CarbonImmutable::parse($s, 'UTC');
    }

    private function wholeDay(string $ymd): Due
    {
        $day = $this->at($ymd);
        return new Due($day, $day->addDay());
    }

    public function test_outside_active_hours_there_is_no_window(): void
    {
        $due = $this->wholeDay('2026-09-30');
        $this->assertNull($this->windows->current(EventState::Preparing, $this->user, $due, $this->at('2026-09-20 08:59')));
        $this->assertNull($this->windows->current(EventState::Preparing, $this->user, $due, $this->at('2026-09-20 22:00')));
        $this->assertNull($this->windows->current(EventState::Today, $this->user, $due, $this->at('2026-09-30 23:00')));
    }

    public function test_preparing_and_overdue_have_one_daily_window(): void
    {
        $due = $this->wholeDay('2026-09-30');
        foreach ([EventState::Preparing, EventState::Overdue] as $state) {
            $w = $this->windows->current($state, $this->user, $due, $this->at('2026-09-20 12:34'));
            $this->assertSame('2026-09-20 09:00', $w->start->format('Y-m-d H:i'));
            $this->assertSame('2026-09-20 22:00', $w->end->format('Y-m-d H:i'));
            $this->assertTrue($w->fallbackAllowed);
            $this->assertSame('2026-09-20 21:30', $w->fallbackAt->format('Y-m-d H:i'));
        }
    }

    public function test_today_has_hourly_windows_with_fallback_only_in_listed_hours(): void
    {
        $due = $this->wholeDay('2026-09-30');

        $w = $this->windows->current(EventState::Today, $this->user, $due, $this->at('2026-09-30 09:20'));
        $this->assertSame('2026-09-30 09:00', $w->start->format('Y-m-d H:i'));
        $this->assertSame('2026-09-30 10:00', $w->end->format('Y-m-d H:i'));
        $this->assertTrue($w->fallbackAllowed);
        $this->assertSame('2026-09-30 09:50', $w->fallbackAt->format('Y-m-d H:i'));

        $w = $this->windows->current(EventState::Today, $this->user, $due, $this->at('2026-09-30 11:05'));
        $this->assertSame('2026-09-30 11:00', $w->start->format('Y-m-d H:i'));
        $this->assertFalse($w->fallbackAllowed);

        $w = $this->windows->current(EventState::Today, $this->user, $due, $this->at('2026-09-30 21:59'));
        $this->assertSame('2026-09-30 22:00', $w->end->format('Y-m-d H:i'));
    }

    public function test_today_window_is_truncated_by_due_moment_and_becomes_fallback(): void
    {
        $day = $this->at('2026-09-30');

        $due = new Due($day, $day->setTime(9, 30));
        $w = $this->windows->current(EventState::Today, $this->user, $due, $this->at('2026-09-30 09:05'));
        $this->assertSame('2026-09-30 09:30', $w->end->format('Y-m-d H:i'));
        $this->assertSame('2026-09-30 09:20', $w->fallbackAt->format('Y-m-d H:i'));

        $due = new Due($day, $day->setTime(11, 15));
        $w = $this->windows->current(EventState::Today, $this->user, $due, $this->at('2026-09-30 11:02'));
        $this->assertSame('2026-09-30 11:15', $w->end->format('Y-m-d H:i'));
        $this->assertTrue($w->fallbackAllowed, 'обрезанное окно всегда fallback-окно');
        $this->assertSame('2026-09-30 11:05', $w->fallbackAt->format('Y-m-d H:i'));
    }

    public function test_no_window_once_due_moment_passed(): void
    {
        $day = $this->at('2026-09-30');
        $due = new Due($day, $day->setTime(11, 15));
        $this->assertNull($this->windows->current(EventState::Today, $this->user, $due, $this->at('2026-09-30 11:20')));
    }
}