<?php

namespace App\Http\Controllers\Api;

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

class ActivityController extends Controller
{
    public function index(Request $request): JsonResponse
    {
        $query = Activity::with('venue:id,name')->orderByDesc('id');
        $this->restrictByVenue($request, $query);

        if ($request->filled('keyword')) {
            $keyword = trim((string) $request->input('keyword'));
            $query->where('title', 'like', "%{$keyword}%");
        }
        if ($request->filled('venue_id')) {
            $query->where('venue_id', (int) $request->input('venue_id'));
        }
        if ($request->filled('is_active')) {
            $query->where('is_active', (bool) $request->boolean('is_active'));
        }

        $pageSize = max(1, min(100, (int) $request->input('page_size', 10)));
        return response()->json($query->paginate($pageSize));
    }

    public function store(Request $request): JsonResponse
    {
        $data = $request->validate([
            'venue_id' => ['required', 'integer', 'exists:venues,id'],
            'title' => ['required', 'string', 'max:150'],
            'summary' => ['nullable', 'string', 'max:255'],
            'category' => ['nullable', 'string', 'max:50'],
            'quota' => ['nullable', 'integer', 'min:0'],
            'start_at' => ['nullable', 'date'],
            'end_at' => ['nullable', 'date'],
            'address' => ['nullable', 'string', 'max:255'],
            'lat' => ['nullable', 'numeric'],
            'lng' => ['nullable', 'numeric'],
            'detail_html' => ['nullable', 'string'],
            'cover_image' => ['nullable', 'string', 'max:255'],
            'gallery_media' => ['nullable', 'array'],
            'gallery_media.*.type' => ['required_with:gallery_media', 'in:image,video'],
            'gallery_media.*.url' => ['required_with:gallery_media', 'string', 'max:255'],
            'tags' => ['nullable', 'array'],
            'tags.*' => ['string', 'max:50'],
            'reservation_notice' => ['nullable', 'string'],
            'open_time' => ['nullable', 'string'],
            'sort' => ['nullable', 'integer', 'min:0'],
            'is_active' => ['boolean'],
        ]);

        $this->ensureVenuePermission($request, (int) $data['venue_id']);

        if (!$request->user()?->isSuperAdmin()) {
            unset($data['sort']);
        }

        $this->normalizeActivityDates($data);

        $activity = Activity::create($data + [
            'quota' => $data['quota'] ?? 0,
            'tags' => array_values($data['tags'] ?? []),
            'sort' => $data['sort'] ?? 0,
            'is_active' => $data['is_active'] ?? true,
        ]);
        return response()->json($activity->load('venue:id,name'), 201);
    }

    public function update(Request $request, Activity $activity): JsonResponse
    {
        $this->ensureVenuePermission($request, $activity->venue_id);

        $data = $request->validate([
            'venue_id' => ['sometimes', 'integer', 'exists:venues,id'],
            'title' => ['sometimes', 'string', 'max:150'],
            'summary' => ['sometimes', 'nullable', 'string', 'max:255'],
            'category' => ['nullable', 'string', 'max:50'],
            'quota' => ['sometimes', 'integer', 'min:0'],
            'start_at' => ['nullable', 'date'],
            'end_at' => ['nullable', 'date'],
            'address' => ['nullable', 'string', 'max:255'],
            'lat' => ['nullable', 'numeric'],
            'lng' => ['nullable', 'numeric'],
            'detail_html' => ['nullable', 'string'],
            'cover_image' => ['nullable', 'string', 'max:255'],
            'gallery_media' => ['nullable', 'array'],
            'gallery_media.*.type' => ['required_with:gallery_media', 'in:image,video'],
            'gallery_media.*.url' => ['required_with:gallery_media', 'string', 'max:255'],
            'tags' => ['sometimes', 'nullable', 'array'],
            'tags.*' => ['string', 'max:50'],
            'reservation_notice' => ['nullable', 'string'],
            'open_time' => ['nullable', 'string'],
            'sort' => ['nullable', 'integer', 'min:0'],
            'is_active' => ['boolean'],
        ]);

        if (array_key_exists('venue_id', $data)) {
            $this->ensureVenuePermission($request, (int) $data['venue_id']);
        }
        if (!$request->user()?->isSuperAdmin()) {
            unset($data['sort']);
        }

        $this->normalizeActivityDates($data);

        $activity->fill($data)->save();
        if (array_key_exists('tags', $data)) {
            $activity->tags = array_values($data['tags'] ?? []);
            $activity->save();
        }
        return response()->json($activity->fresh()->load('venue:id,name'));
    }

    public function toggle(Request $request, Activity $activity): JsonResponse
    {
        $this->ensureVenuePermission($request, $activity->venue_id);
        $activity->is_active = !$activity->is_active;
        $activity->save();
        return response()->json($activity->fresh()->load('venue:id,name'));
    }

    public function destroy(Request $request, Activity $activity): JsonResponse
    {
        $this->ensureVenuePermission($request, $activity->venue_id);
        $count = $activity->reservations()->count();
        if ($count > 0) {
            return response()->json([
                'message' => '该活动已有报名记录，不能删除',
                'reservation_count' => $count,
            ], 422);
        }
        $activity->delete();
        return response()->json(['message' => '删除成功']);
    }

    public function restore(Request $request, int $activityId): JsonResponse
    {
        $activity = Activity::withTrashed()->findOrFail($activityId);
        $this->ensureVenuePermission($request, $activity->venue_id);
        $disableAfterRestore = $request->boolean('disable_after_restore');
        $activity->restore();
        if ($disableAfterRestore) {
            $activity->is_active = false;
            $activity->save();
        }
        return response()->json($activity->fresh()->load('venue:id,name'));
    }

    /**
     * 开始/结束仅传年月日时：开始为当日 00:00:00，结束为当日 23:59:59，允许同一天。
     *
     * @param  array<string, mixed>  $data
     */
    private function normalizeActivityDates(array &$data): void
    {
        if (array_key_exists('start_at', $data)) {
            if ($data['start_at'] === null || $data['start_at'] === '') {
                $data['start_at'] = null;
            } else {
                $data['start_at'] = Carbon::parse($data['start_at'])->startOfDay();
            }
        }
        if (array_key_exists('end_at', $data)) {
            if ($data['end_at'] === null || $data['end_at'] === '') {
                $data['end_at'] = null;
            } else {
                $data['end_at'] = Carbon::parse($data['end_at'])->endOfDay();
            }
        }
        if (!empty($data['start_at']) && !empty($data['end_at']) && $data['end_at']->lt($data['start_at'])) {
            throw ValidationException::withMessages(['end_at' => ['结束日期不能早于开始日期']]);
        }
    }

    private function restrictByVenue(Request $request, $query): void
    {
        $user = $request->user();
        if ($user->isSuperAdmin()) {
            return;
        }
        $query->whereIn('venue_id', $user->venues()->pluck('venues.id'));
    }

    private function ensureVenuePermission(Request $request, int $venueId): void
    {
        $user = $request->user();
        if ($user->isSuperAdmin()) {
            return;
        }
        $allowed = $user->venues()->where('venues.id', $venueId)->exists();
        abort_unless($allowed, 403, '仅可操作已绑定场馆');
    }
}