<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Blacklist;
use App\Models\Reservation;
use App\Models\TicketGrabEvent;
use App\Models\TicketGrabVenueReleaseDay;
use App\Models\Venue;
use App\Models\WechatUser;
use App\Services\ChineseIdCardHelper;
use App\Services\TicketGrabReleaseDayService;
use App\Support\CalendarDateFormat;
use Carbon\Carbon;
use Carbon\CarbonPeriod;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;
use Illuminate\Validation\ValidationException;
use Laravel\Sanctum\PersonalAccessToken;

class H5TicketGrabController extends Controller
{
    public function show(Request $request, int $id): JsonResponse
    {
        $e = TicketGrabEvent::query()
            ->with(['venues' => function ($q) {
                $q->select('venues.id', 'name', 'address', 'cover_image', 'district', 'open_time', 'lat', 'lng');
            }])
            ->visibleOnH5()
            ->findOrFail($id);
        $e->setAttribute('schedule_status', TicketGrabEvent::computeScheduleStatusFromBounds($e->start_at, $e->end_at));
        // 直接使用已关联场馆字段；勿用 toH5Payload() 过滤，否则未过审/未激活的场馆会从列表消失，导致 H5 无「参与场馆」
        $venues = $e->venues->map(function (Venue $v) {
            return [
                'id' => (int) $v->id,
                'name' => $v->name,
                'cover_image' => $v->cover_image,
                'district' => $v->district,
                'open_time' => $v->open_time,
                'address' => $v->address,
                'lat' => $v->lat !== null ? (float) $v->lat : null,
                'lng' => $v->lng !== null ? (float) $v->lng : null,
            ];
        })->values();

        return response()->json([
            'id' => $e->id,
            'list_kind' => 'ticket_grab',
            'title' => $e->title,
            'summary' => $e->summary,
            'detail_html' => $e->detail_html,
            'image' => $e->cover_image,
            'carousel' => $this->buildGalleryCarousel($e),
            'start_at' => CalendarDateFormat::ymdFromDatetime($e->start_at),
            'end_at' => CalendarDateFormat::ymdFromDatetime($e->end_at),
            'schedule_status' => $e->schedule_status,
            'registered_count' => (int) $e->registered_count,
            'tags' => array_values($e->tags ?? []),
            'reservation_notice' => $e->reservation_notice,
            'booking_start_at' => CalendarDateFormat::ymdFromDateValue($e->booking_start_at),
            'booking_end_at' => CalendarDateFormat::ymdFromDateValue($e->booking_end_at),
            'daily_release_start_time' => $e->daily_release_start_time,
            'daily_release_end_time' => $e->daily_release_end_time,
            'booking_audience' => $e->booking_audience,
            'venue_blocks' => $venues,
        ]);
    }

    public function bookingInfo(Request $request, int $id): JsonResponse
    {
        $e = TicketGrabEvent::query()->visibleOnH5()->findOrFail($id);
        $data = $request->validate(['venue_id' => ['required', 'integer', 'exists:venues,id']]);
        $venueId = (int) $data['venue_id'];
        $pivot = $e->venues()->where('venues.id', $venueId)->exists();
        if (! $pivot) {
            throw ValidationException::withMessages(['venue_id' => ['该抢票活动未开放此场馆']]);
        }
        TicketGrabReleaseDayService::syncCarryInChain($e->id, $venueId);
        $today = now()->toDateString();
        $release = TicketGrabVenueReleaseDay::query()
            ->where('ticket_grab_event_id', $e->id)
            ->where('venue_id', $venueId)
            ->whereDate('release_date', $today)
            ->first();
        $inBookingWindow = $e->booking_start_at && $e->booking_end_at
            && $today >= $e->booking_start_at->toDateString()
            && $today <= $e->booking_end_at->toDateString();
        $timeOk = $this->dailyReleaseTimeOpen($e);
        $remaining = 0;
        if ($release) {
            $remaining = $release->availableRemaining();
        }
        $entryDates = $this->entryDateRange($e);

        $wechatUser = $this->authWechatUser($request);
        $hasExisting = $wechatUser && $this->userHasActiveTicketGrabForEvent($e->id, $wechatUser->id);

        return response()->json([
            'event' => $this->eventMini($e),
            'venue_id' => $venueId,
            'has_existing_reservation' => (bool) $hasExisting,
            'today_release' => $release ? [
                'id' => $release->id,
                'release_date' => $release->release_date->toDateString(),
                'day_quota' => (int) $release->day_quota,
                'carry_in' => (int) $release->carry_in,
                'booked_count' => (int) $release->booked_count,
                'remaining' => (int) $remaining,
            ] : null,
            'in_booking_window' => (bool) $inBookingWindow,
            'in_daily_release_time' => $timeOk,
            'can_book_now' => $inBookingWindow && $timeOk && $release && $remaining > 0,
            'entry_dates' => $entryDates,
        ]);
    }

    public function create(Request $request, int $id): JsonResponse
    {
        $wechatUser = $this->authWechatUser($request);
        if (! $wechatUser) {
            return response()->json(['message' => '请先微信登录后再预约'], 401);
        }
        $e = TicketGrabEvent::query()->visibleOnH5()->findOrFail($id);
        $data = $request->validate([
            'venue_id' => ['required', 'integer', 'exists:venues,id'],
            'visitor_name' => ['required', 'string', 'max:80'],
            'visitor_phone' => ['required', 'regex:/^1\d{10}$/'],
            'id_card' => ['required', 'string', 'size:18'],
            'entry_date' => ['required', 'date'],
            'ticket_count' => ['nullable', 'integer', 'min:1', 'max:2'],
            'ticket_mode' => ['nullable', 'in:single,pair'],
        ]);
        if (! $e->venues()->where('venues.id', (int) $data['venue_id'])->exists()) {
            throw ValidationException::withMessages(['venue_id' => ['该抢票活动未开放此场馆']]);
        }
        $venueId = (int) $data['venue_id'];
        if (Blacklist::query()->where('venue_id', $venueId)->where('visitor_phone', $data['visitor_phone'])->exists()) {
            throw ValidationException::withMessages([
                'visitor_phone' => ['您已被该场馆限制预约，如有疑问请联系场馆。'],
            ]);
        }
        $tz = (string) config('app.timezone');
        $birth = ChineseIdCardHelper::parseBirthdate($data['id_card']);
        if (! $birth) {
            throw ValidationException::withMessages(['id_card' => ['身份证格式无效']]);
        }
        if ($e->age_limit_start || $e->age_limit_end) {
            if (! ChineseIdCardHelper::isBirthInRange($birth, $e->age_limit_start, $e->age_limit_end, $tz)) {
                throw ValidationException::withMessages(['id_card' => ['该证件不在本次活动允许的出生日期范围内']]);
            }
        }
        if ($e->booking_audience === TicketGrabEvent::AUDIENCE_ALL) {
            $ticketCount = 1;
        } else {
            $mode = (string) ($data['ticket_mode'] ?? 'single');
            if ($mode === 'pair') {
                $ticketCount = 2;
            } else {
                $ticketCount = 1;
            }
        }
        if ($e->start_at && $e->end_at) {
            $en = Carbon::parse($data['entry_date'], $tz)->startOfDay();
            if ($en->lt($e->start_at->copy()->startOfDay()) || $en->gt($e->end_at->copy()->startOfDay())) {
                throw ValidationException::withMessages(['entry_date' => ['入馆日期需落在活动举办日期范围内']]);
            }
        }
        $today = now()->toDateString();
        if (! $e->booking_start_at || ! $e->booking_end_at
            || $today < $e->booking_start_at->toDateString()
            || $today > $e->booking_end_at->toDateString()) {
            throw ValidationException::withMessages(['message' => ['当前不在预约开放时间内']]);
        }
        if (! $this->dailyReleaseTimeOpen($e)) {
            throw ValidationException::withMessages(['message' => ['当前不在今日放票时段内']]);
        }
        // 同一微信用户：同一抢票活动下仅允许 1 条非取消订单（一个场馆、一个入馆日）
        if ($this->userHasActiveTicketGrabForEvent($e->id, $wechatUser->id)) {
            throw ValidationException::withMessages([
                'message' => ['您已预约过本活动，每位用户仅可预约一个参与场馆的指定入馆日，无需重复预约'],
            ]);
        }
        $dup = Reservation::query()
            ->where('reservation_kind', Reservation::KIND_TICKET_GRAB)
            ->where('ticket_grab_event_id', $e->id)
            ->where('id_card', $data['id_card'])
            ->whereDate('entry_date', $data['entry_date'])
            ->where('status', '!=', 'cancelled')
            ->exists();
        if ($dup) {
            throw ValidationException::withMessages(['id_card' => ['该证件对所选入馆日已有一条预约，无需重复']]);
        }
        TicketGrabReleaseDayService::syncCarryInChain($e->id, $venueId);
        $pre = TicketGrabVenueReleaseDay::query()
            ->where('ticket_grab_event_id', $e->id)
            ->where('venue_id', $venueId)
            ->whereDate('release_date', $today)
            ->first();
        if (! $pre) {
            throw ValidationException::withMessages(['message' => ['今日无放票计划']]);
        }
        if ($pre->availableRemaining() < $ticketCount) {
            throw ValidationException::withMessages(['message' => ['当前余票不足']]);
        }
        if ($e->booking_audience === TicketGrabEvent::AUDIENCE_SCHOOL_AGE) {
            if ($ticketCount === 2 && $pre->availableRemaining() < 2) {
                throw ValidationException::withMessages(['message' => ['余票仅 1 张，无法选择「一大一小」']]);
            }
        }
        $res = DB::transaction(function () use ($e, $data, $wechatUser, $venueId, $ticketCount) {
            // 串行同活动下并发下单，防同一微信用户重复插单
            TicketGrabEvent::query()->whereKey($e->id)->lockForUpdate()->first();
            if ($this->userHasActiveTicketGrabForEvent($e->id, $wechatUser->id)) {
                throw ValidationException::withMessages([
                    'message' => ['您已预约过本活动，每位用户仅可预约一个参与场馆的指定入馆日，无需重复预约'],
                ]);
            }
            if (Reservation::query()
                ->where('reservation_kind', Reservation::KIND_TICKET_GRAB)
                ->where('ticket_grab_event_id', $e->id)
                ->where('id_card', $data['id_card'])
                ->whereDate('entry_date', $data['entry_date'])
                ->where('status', '!=', 'cancelled')
                ->exists()) {
                throw ValidationException::withMessages(['id_card' => ['该证件对所选入馆日已有一条预约，无需重复']]);
            }
            $r = TicketGrabVenueReleaseDay::query()
                ->where('ticket_grab_event_id', $e->id)
                ->where('venue_id', $venueId)
                ->whereDate('release_date', now()->toDateString())
                ->lockForUpdate()
                ->first();
            if (! $r) {
                throw ValidationException::withMessages(['message' => ['今日无放票计划']]);
            }
            if ($r->availableRemaining() < $ticketCount) {
                throw ValidationException::withMessages(['message' => ['当前余票不足']]);
            }
            $r->increment('booked_count', $ticketCount);
            $row = Reservation::create([
                'reservation_kind' => Reservation::KIND_TICKET_GRAB,
                'venue_id' => $venueId,
                'activity_id' => null,
                'ticket_grab_event_id' => $e->id,
                'activity_day_id' => null,
                'ticket_grab_venue_release_day_id' => $r->id,
                'entry_date' => Carbon::parse($data['entry_date'])->toDateString(),
                'wechat_user_id' => $wechatUser->id,
                'visitor_name' => $data['visitor_name'],
                'visitor_phone' => $data['visitor_phone'],
                'id_card' => $data['id_card'],
                'ticket_count' => $ticketCount,
                'ticket_mode' => $e->booking_audience === TicketGrabEvent::AUDIENCE_SCHOOL_AGE
                    ? ($data['ticket_mode'] ?? 'single') : null,
                'booking_type' => 'individual',
                'qr_token' => (string) Str::uuid(),
                'status' => 'pending',
                'reservation_source' => 'wechat_h5_tg',
            ]);
            \App\Models\TicketGrabEvent::refreshRegisteredCountFromReservations($e->id);
            $row->load(['ticketGrabEvent', 'venue', 'ticketGrabReleaseDay']);

            return $row;
        });
        $arr = app(H5ReservationController::class)->reservationToH5Array($res);

        return response()->json([
            'message' => '预约成功',
            'reservation' => $arr,
        ], 201);
    }

    /**
     * 同一微信用户在同一抢票活动下是否已有非取消预约（含待核销、已核销、已过期等）。
     */
    private function userHasActiveTicketGrabForEvent(int $ticketGrabEventId, int $wechatUserId): bool
    {
        return Reservation::query()
            ->where('reservation_kind', Reservation::KIND_TICKET_GRAB)
            ->where('ticket_grab_event_id', $ticketGrabEventId)
            ->where('wechat_user_id', $wechatUserId)
            ->where('status', '!=', 'cancelled')
            ->exists();
    }

    private function dailyReleaseTimeOpen(TicketGrabEvent $e): bool
    {
        return TicketGrabEvent::isDailyReleaseTimeWindowOpen($e);
    }

    private function eventMini(TicketGrabEvent $e): array
    {
        return [
            'id' => $e->id,
            'title' => $e->title,
            'booking_start_at' => CalendarDateFormat::ymdFromDateValue($e->booking_start_at),
            'booking_end_at' => CalendarDateFormat::ymdFromDateValue($e->booking_end_at),
            'start_at' => CalendarDateFormat::ymdFromDatetime($e->start_at),
            'end_at' => CalendarDateFormat::ymdFromDatetime($e->end_at),
            'daily_release_start_time' => $e->daily_release_start_time,
            'daily_release_end_time' => $e->daily_release_end_time,
            'booking_audience' => $e->booking_audience,
            'reservation_notice' => $e->reservation_notice,
            'age_limit_start' => CalendarDateFormat::ymdFromDateValue($e->age_limit_start),
            'age_limit_end' => CalendarDateFormat::ymdFromDateValue($e->age_limit_end),
        ];
    }

    private function entryDateRange(TicketGrabEvent $e): array
    {
        if (! $e->start_at || ! $e->end_at) {
            return [];
        }
        $tz = (string) config('app.timezone');
        $s = CalendarDateFormat::ymdFromDatetime($e->start_at);
        $x = CalendarDateFormat::ymdFromDatetime($e->end_at);
        if (! $s || ! $x) {
            return [];
        }
        $out = [];
        foreach (CarbonPeriod::create(
            Carbon::parse($s, $tz)->startOfDay(),
            Carbon::parse($x, $tz)->startOfDay()
        ) as $d) {
            $out[] = $d->toDateString();
        }

        return $out;
    }

    private function buildGalleryCarousel(TicketGrabEvent $model): array
    {
        $items = [];
        $seen = [];
        foreach ($model->gallery_media ?? [] as $m) {
            if (! is_array($m)) {
                continue;
            }
            $url = trim((string) ($m['url'] ?? ''));
            if ($url === '' || isset($seen[$url])) {
                continue;
            }
            $type = $m['type'] ?? 'image';
            if (! in_array($type, ['image', 'video'], true)) {
                $type = 'image';
            }
            $seen[$url] = true;
            $items[] = ['type' => $type, 'url' => $url];
        }
        if ($items === [] && $model->cover_image) {
            $url = trim((string) $model->cover_image);
            if ($url !== '') {
                $items[] = ['type' => 'image', 'url' => $url];
            }
        }

        return $items;
    }

    private function authWechatUser(Request $request): ?WechatUser
    {
        $token = $request->bearerToken();
        if (! $token) {
            return null;
        }
        $access = PersonalAccessToken::findToken($token);
        if (! $access || ! ($access->tokenable instanceof WechatUser)) {
            return null;
        }

        return $access->tokenable;
    }

}