<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Activity;
use App\Models\ActivitySession;
use App\Support\ApiResponse;
use Carbon\Carbon;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Validation\ValidationException;

class ActivitySessionController extends Controller
{
    use ApiResponse;

    public function index(int $activity): JsonResponse
    {
        Activity::query()->findOrFail($activity);
        $items = ActivitySession::query()
            ->where('activity_id', $activity)
            ->orderBy('sort')
            ->orderBy('id')
            ->get()
            ->map(fn (ActivitySession $s) => $this->serialize($s));

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

    public function store(Request $request, int $activity): JsonResponse
    {
        $activityModel = Activity::query()->findOrFail($activity);
        $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'],
        ]);
        $this->assertSessionWithinActivity($activityModel, $data);

        $session = ActivitySession::query()->create([
            'activity_id' => $activity,
            ...$data,
        ]);

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

    public function update(Request $request, int $activity, int $session): JsonResponse
    {
        $activityModel = Activity::query()->findOrFail($activity);
        $model = ActivitySession::query()->where('activity_id', $activity)->findOrFail($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'],
        ]);
        $this->assertSessionWithinActivity($activityModel, $data, $model);
        $model->fill($data);
        $model->save();

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

    public function destroy(int $activity, int $session): JsonResponse
    {
        $model = ActivitySession::query()->where('activity_id', $activity)->findOrFail($session);
        $model->delete();

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

    /**
     * @return array<string, mixed>
     */
    /**
     * @param  array<string, mixed>  $data
     */
    protected function assertSessionWithinActivity(Activity $activity, array $data, ?ActivitySession $existing = null): void
    {
        $startsAt = $data['starts_at'] ?? $existing?->starts_at?->toIso8601String();
        $endsAt = $data['ends_at'] ?? $existing?->ends_at?->toIso8601String();

        if ($startsAt && $activity->event_start_date) {
            $start = Carbon::parse($startsAt);
            if ($start->toDateString() < $activity->event_start_date->toDateString()) {
                throw ValidationException::withMessages([
                    'starts_at' => ['场次开始时间不能早于活动开始日期'],
                ]);
            }
        }

        if ($endsAt && $activity->event_end_date) {
            $end = Carbon::parse($endsAt);
            if ($end->toDateString() > $activity->event_end_date->toDateString()) {
                throw ValidationException::withMessages([
                    'ends_at' => ['场次结束时间不能晚于活动结束日期'],
                ]);
            }
        }

        if ($startsAt && $endsAt && Carbon::parse($endsAt)->lt(Carbon::parse($startsAt))) {
            throw ValidationException::withMessages([
                'ends_at' => ['场次结束时间不能早于开始时间'],
            ]);
        }
    }

    protected function serialize(ActivitySession $s): array
    {
        return [
            'id' => $s->id,
            'activity_id' => $s->activity_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,
        ];
    }
}