<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Course;
use App\Models\CourseSession;
use App\Support\ApiResponse;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class CourseSessionController extends Controller
{
    use ApiResponse;

    public function index(int $course): JsonResponse
    {
        Course::query()->findOrFail($course);
        $items = CourseSession::query()
            ->where('course_id', $course)
            ->orderBy('sort')
            ->orderBy('id')
            ->get()
            ->map(fn (CourseSession $s) => $this->serialize($s));

        return $this->ok(['items' => $items]);
    }

    public function store(Request $request, int $course): JsonResponse
    {
        Course::query()->findOrFail($course);
        $data = $request->validate([
            'title' => ['nullable', 'string', 'max:255'],
            'starts_at' => ['nullable', 'date'],
            'ends_at' => ['nullable', 'date', 'after_or_equal:starts_at'],
            'venue' => ['nullable', 'string', 'max:255'],
            'capacity' => ['nullable', 'integer', 'min:0'],
            'sort' => ['nullable', 'integer'],
        ]);

        $session = CourseSession::query()->create([
            'course_id' => $course,
            ...$data,
        ]);

        return $this->ok(['id' => $session->id], '已创建');
    }

    public function update(Request $request, int $course, int $session): JsonResponse
    {
        $model = CourseSession::query()->where('course_id', $course)->findOrFail($session);
        $data = $request->validate([
            'title' => ['nullable', 'string', 'max:255'],
            'starts_at' => ['nullable', 'date'],
            'ends_at' => ['nullable', 'date'],
            'venue' => ['nullable', 'string', 'max:255'],
            'capacity' => ['nullable', 'integer', 'min:0'],
            'sort' => ['nullable', 'integer'],
        ]);
        $model->fill($data);
        $model->save();

        return $this->ok(null, '已保存');
    }

    public function destroy(int $course, int $session): JsonResponse
    {
        $model = CourseSession::query()->where('course_id', $course)->findOrFail($session);
        $model->delete();

        return $this->ok(null, '已删除');
    }

    /**
     * @return array<string, mixed>
     */
    protected function serialize(CourseSession $s): array
    {
        return [
            'id' => $s->id,
            'course_id' => $s->course_id,
            'title' => $s->title,
            'starts_at' => $s->starts_at?->toIso8601String(),
            'ends_at' => $s->ends_at?->toIso8601String(),
            'venue' => $s->venue,
            'capacity' => $s->capacity !== null ? (int) $s->capacity : null,
            'sort' => (int) $s->sort,
        ];
    }
}