<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Activity;
use App\Models\Blacklist;
use App\Models\TicketGrabEvent;
use App\Models\TicketGrabEventVenue;
use App\Models\Venue;
use App\Services\DashboardTicketGrabStatsService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;

class DashboardController extends Controller
{
    public function stats(Request $request): JsonResponse
    {
        $user = $request->user();
        $allowedVenueIds = $user->isSuperAdmin()
            ? Venue::query()->pluck('id')
            : $user->venues()->pluck('venues.id');

        $selectedVenueId = $request->filled('venue_id') ? (int) $request->input('venue_id') : null;
        $venueIds = $allowedVenueIds;
        if ($selectedVenueId) {
            $venueIds = $venueIds->filter(fn ($id) => (int) $id === $selectedVenueId)->values();
        }

        $activityId = $request->filled('activity_id') ? (int) $request->input('activity_id') : null;
        if ($activityId) {
            $allowed = Activity::query()
                ->whereKey($activityId)
                ->whereNull('deleted_at')
                ->whereIn('venue_id', $venueIds)
                ->exists();
            if (! $allowed) {
                return response()->json(['message' => '活动不存在或无权查看'], 422);
            }
        }

        /** 顶部指标：账号可见场馆范围内的全量累计（不受「筛选场馆」影响） */
        $scopeVenueIds = $allowedVenueIds;

        $userCount = (int) DB::table('reservations')
            ->whereIn('venue_id', $scopeVenueIds)
            ->whereNotNull('wechat_user_id')
            ->selectRaw('COUNT(DISTINCT wechat_user_id) as c')
            ->value('c');

        $activitySessions = Activity::query()
            ->whereIn('venue_id', $scopeVenueIds)
            ->whereNull('deleted_at')
            ->count();

        $ticketGrabSessions = TicketGrabEvent::query()
            ->whereHas('venues', fn ($vq) => $vq->whereIn('venues.id', $scopeVenueIds))
            ->count();

        $blacklistedUniqueQuery = Blacklist::query()
            ->active()
            ->whereIn('venue_id', $scopeVenueIds)
            ->whereNotNull('visitor_phone')
            ->whereRaw("TRIM(visitor_phone) <> ''")
            ->whereExists(function ($q) use ($scopeVenueIds, $user) {
                $q->selectRaw('1')
                    ->from('reservations')
                    ->whereColumn('reservations.visitor_phone', 'blacklists.visitor_phone')
                    ->whereIn('reservations.venue_id', $scopeVenueIds);

                if ($user->isSuperAdmin() && Schema::hasTable('wechat_users')) {
                    $q->whereNotNull('reservations.wechat_user_id')
                        ->whereExists(function ($wq) {
                            $wq->selectRaw('1')
                                ->from('wechat_users')
                                ->whereColumn('wechat_users.id', 'reservations.wechat_user_id');
                        });
                }
            });
        $blacklistedUnique = $blacklistedUniqueQuery
            ->distinct('visitor_phone')
            ->count('visitor_phone');

        $baseActivityQuery = Activity::query()
            ->whereIn('venue_id', $venueIds)
            ->whereNull('deleted_at');
        if ($activityId !== null) {
            $baseActivityQuery->whereKey($activityId);
        }

        $totalViews = (int) (clone $baseActivityQuery)->sum('view_count');

        $page = max(1, (int) $request->input('activity_stats_page', 1));
        $pageSize = max(1, min(2000, (int) $request->input('activity_stats_page_size', 500)));

        $totalActivities = (clone $baseActivityQuery)->count();
        $activityRows = (clone $baseActivityQuery)
            ->orderByDesc('view_count')
            ->orderByDesc('id')
            ->forPage($page, $pageSize)
            ->get(['id', 'title', 'venue_id', 'start_at', 'end_at', 'view_count']);

        $venueIdsForNames = $activityRows->pluck('venue_id')->unique()->filter()->values()->all();
        $venueNameMap = $venueIdsForNames === []
            ? collect()
            : Venue::query()->whereIn('id', $venueIdsForNames)->pluck('name', 'id');

        $activityStatsActivities = $activityRows->map(function ($a) use ($venueNameMap) {
            $vid = (int) $a->venue_id;

            return [
                'id' => (int) $a->id,
                'title' => (string) $a->title,
                'venue_id' => $vid,
                'venue_name' => (string) ($venueNameMap[$vid] ?? ('#'.$vid)),
                'view_count' => (int) ($a->view_count ?? 0),
                'start_at' => $a->start_at,
                'end_at' => $a->end_at,
            ];
        })->values()->all();

        return response()->json([
            'scope' => [
                'role' => $user->role,
                'venue_id' => $selectedVenueId,
                'activity_id' => $activityId,
            ],
            'summary' => [
                'activity_sessions' => (int) $activitySessions,
                'ticket_grab_sessions' => (int) $ticketGrabSessions,
                'user_count' => (int) $userCount,
                'blacklisted_unique' => (int) $blacklistedUnique,
            ],
            'activity_stats' => [
                'total_view_count' => $totalViews,
            ],
            'activity_stats_activities' => [
                'data' => $activityStatsActivities,
                'total' => $totalActivities,
                'page' => $page,
                'page_size' => $pageSize,
            ],
        ]);
    }

    public function ticketGrabStats(Request $request, DashboardTicketGrabStatsService $ticketGrabStats): JsonResponse
    {
        $validated = $request->validate([
            'ticket_grab_event_id' => ['required', 'integer', 'exists:ticket_grab_events,id'],
            'date' => ['required', 'date_format:Y-m-d'],
        ]);

        $user = $request->user();
        $allowedVenueIds = $user->isSuperAdmin()
            ? Venue::query()->pluck('id')
            : $user->venues()->pluck('venues.id');

        $eventId = (int) $validated['ticket_grab_event_id'];
        $date = $validated['date'];

        $pivotVenues = TicketGrabEventVenue::query()
            ->where('ticket_grab_event_id', $eventId)
            ->pluck('venue_id');
        if ($pivotVenues->isNotEmpty() && ! $user->isSuperAdmin()) {
            $allow = $allowedVenueIds->map(fn ($id) => (int) $id);
            $ok = false;
            foreach ($pivotVenues as $vid) {
                if ($allow->contains((int) $vid)) {
                    $ok = true;
                    break;
                }
            }
            if (! $ok) {
                return response()->json(['message' => '无权查看该抢票活动统计'], 403);
            }
        }

        $scoped = DashboardTicketGrabStatsService::scopedVenueIdsForEvent($eventId, $allowedVenueIds);
        if ($scoped->isEmpty()) {
            return response()->json(['message' => '当前账号下无可统计的场馆或未配置参与场馆'], 403);
        }

        $payload = $ticketGrabStats->build($eventId, $date, $scoped);
        if (isset($payload['error'])) {
            return response()->json(['message' => $payload['error']], 404);
        }

        $payload['data_updated_at'] = $date;

        return response()->json($payload);
    }
}