<?php

namespace App\Http\Controllers\Miniapp;

use App\Models\Activity;
use App\Models\ActivitySignup;
use App\Models\ActivitySignupCheckin;
use App\Models\Course;
use App\Models\CourseCheckinDay;
use App\Models\CourseSignup;
use App\Models\CourseSignupCheckin;
use App\Models\MiniappUser;
use App\Support\ApiResponse;
use App\Support\ActivitySigninCodeSync;
use App\Support\CourseCheckinDaySync;
use App\Support\Miniapp\MiniappPresenter;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class CheckinController extends BaseController
{
    use ApiResponse;

    public function course(Request $request): JsonResponse
    {
        /** @var MiniappUser $user */
        $user = $request->user();

        $data = $request->validate([
            'signin_code' => ['required', 'string', 'max:64'],
        ]);

        [$day, $courseHint] = $this->resolveCourseCheckinDay($data['signin_code']);

        if (! $day || ! $day->course) {
            if ($courseHint === 'not_teach_day') {
                return $this->fail('今日非该课程开课日，无法签到', 422);
            }

            return $this->fail('签到码无效', 422);
        }

        $signup = CourseSignup::query()
            ->where('course_id', $day->course_id)
            ->where('miniapp_user_id', $user->id)
            ->first();

        if (! $signup) {
            return $this->fail('您尚未报名该课程，无法签到', 422);
        }

        $checkinDate = $day->teach_date->toDateString();
        $existing = CourseSignupCheckin::query()
            ->where('course_signup_id', $signup->id)
            ->whereDate('checkin_date', $checkinDate)
            ->whereNotNull('checked_in_at')
            ->first();

        if ($existing) {
            return $this->ok([
                'type' => 'course',
                'already_checked_in' => true,
                'checked_in_at' => $existing->checked_in_at?->toIso8601String(),
                'checkin_date' => $checkinDate,
                'target' => MiniappPresenter::serializeCourseList($day->course, $user),
            ], '今日已签到');
        }

        $checkin = CourseSignupCheckin::query()->updateOrCreate(
            [
                'course_signup_id' => $signup->id,
                'checkin_date' => $checkinDate,
            ],
            ['checked_in_at' => now()]
        );

        return $this->ok([
            'type' => 'course',
            'already_checked_in' => false,
            'checked_in_at' => $checkin->checked_in_at?->toIso8601String(),
            'checkin_date' => $checkinDate,
            'target' => MiniappPresenter::serializeCourseList($day->course, $user),
        ], '签到成功');
    }

    public function activity(Request $request): JsonResponse
    {
        /** @var MiniappUser $user */
        $user = $request->user();

        $data = $request->validate([
            'signin_code' => ['required', 'string', 'max:64'],
        ]);

        $code = strtoupper(trim($data['signin_code']));
        $activity = Activity::query()
            ->whereRaw('UPPER(code) = ?', [$code])
            ->first();

        if (! $activity) {
            $activity = Activity::query()
                ->get()
                ->first(fn (Activity $item) => strtoupper(ActivitySigninCodeSync::activitySigninCode($item)) === $code);
        }

        if (! $activity) {
            return $this->fail('签到码无效', 422);
        }

        $activity->load(['activityTypeItem', 'sessions'])->loadCount('signups');

        $signups = ActivitySignup::query()
            ->with('session')
            ->where('activity_id', $activity->id)
            ->where('miniapp_user_id', $user->id)
            ->get();

        if ($signups->isEmpty()) {
            return $this->fail('您尚未报名该活动，无法签到', 422);
        }

        $today = now()->toDateString();
        $signup = $signups->first(
            fn (ActivitySignup $item) => $item->session?->starts_at?->toDateString() === $today
        ) ?? ($signups->count() === 1 ? $signups->first() : null);

        if (! $signup) {
            return $this->fail('今日无您报名的场次，无法签到', 422);
        }

        if (! $signup->activity_session_id) {
            return $this->fail('报名记录缺少场次信息', 422);
        }

        $existing = ActivitySignupCheckin::query()
            ->where('activity_signup_id', $signup->id)
            ->where('activity_session_id', $signup->activity_session_id)
            ->whereNotNull('checked_in_at')
            ->first();

        $target = MiniappPresenter::serializeActivityList($activity, $user);
        $target['summary'] = strip_tags((string) $activity->intro_html);

        if ($existing) {
            return $this->ok([
                'type' => 'activity',
                'already_checked_in' => true,
                'checked_in_at' => $existing->checked_in_at?->toIso8601String(),
                'target' => $target,
                'session' => $signup->session
                    ? MiniappPresenter::serializeActivitySession($signup->session, $user)
                    : null,
            ], '已签到');
        }

        $checkin = ActivitySignupCheckin::query()->updateOrCreate(
            [
                'activity_signup_id' => $signup->id,
                'activity_session_id' => $signup->activity_session_id,
            ],
            ['checked_in_at' => now()]
        );

        return $this->ok([
            'type' => 'activity',
            'already_checked_in' => false,
            'checked_in_at' => $checkin->checked_in_at?->toIso8601String(),
            'target' => $target,
            'session' => $signup->session
                ? MiniappPresenter::serializeActivitySession($signup->session, $user)
                : null,
        ], '签到成功');
    }

    /**
     * @return array{0: ?CourseCheckinDay, 1: ?string}
     */
    protected function resolveCourseCheckinDay(string $signinCode): array
    {
        $withCourse = [
            'course' => fn ($q) => $q
                ->with(['courseSystemItem', 'coverMedia', 'promoMedia'])
                ->withCount('signups'),
        ];

        $day = CourseCheckinDay::query()
            ->with($withCourse)
            ->where('signin_code', trim($signinCode))
            ->first();

        if ($day) {
            return [$day, null];
        }

        $course = $this->resolveCourseBySigninCode($signinCode);
        if (! $course) {
            return [null, null];
        }

        $today = now()->toDateString();
        if (! CourseCheckinDaySync::isTeachDate($course, $today)) {
            return [null, 'not_teach_day'];
        }

        $day = CourseCheckinDay::query()
            ->with($withCourse)
            ->where('course_id', $course->id)
            ->whereDate('teach_date', $today)
            ->first();

        return [$day, null];
    }

    protected function resolveCourseBySigninCode(string $signinCode): ?Course
    {
        $code = strtoupper(trim($signinCode));
        if ($code === '') {
            return null;
        }

        $course = Course::query()->whereRaw('UPPER(code) = ?', [$code])->first();
        if ($course) {
            return $course;
        }

        if (preg_match('/^COURSE-(\d+)$/', $code, $matches)) {
            return Course::query()->find((int) $matches[1]);
        }

        return Course::query()
            ->get()
            ->first(fn (Course $item) => strtoupper(CourseCheckinDaySync::courseSigninCode($item)) === $code);
    }
}