<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Application;
use App\Models\Competition;
use App\Models\PublicSourceChannel;
use App\Models\SmsVerification;
use App\Models\User;
use App\Services\Sms\ParticipantSmsVerificationService;
use App\Services\Sms\SmsSender;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Validation\ValidationException;

class AuthSmsController extends Controller
{
    /** 日志中脱敏手机号 */
    private function maskMobile(string $mobile): string
    {
        if (strlen($mobile) < 11) {
            return '***';
        }

        return substr($mobile, 0, 3).'****'.substr($mobile, -4);
    }

    public function send(Request $request, ParticipantSmsVerificationService $service, SmsSender $sender): JsonResponse
    {
        $data = $request->validate([
            'mobile' => ['required', 'regex:/^1[3-9]\d{9}$/'],
        ]);

        $mobile = $data['mobile'];

        Log::info('sms.send hit', [
            'mobile_mask' => $this->maskMobile($mobile),
            'ip' => $request->ip(),
            'user_agent' => substr((string) $request->userAgent(), 0, 200),
        ]);

        $result = $service->sendLoginCode($mobile, $sender);

        return response()->json($result->toHttpPayload(), $result->success ? 200 : 503);
    }

    public function login(Request $request): JsonResponse
    {
        $data = $request->validate([
            'mobile' => ['required', 'regex:/^1[3-9]\d{9}$/'],
            'code' => ['required', 'string', 'max:64'],
            'competition_slug' => ['required', 'string', 'max:64'],
        ]);
        $data['public_source_code'] = is_string($request->input('public_source_code'))
            ? (string) $request->input('public_source_code')
            : '';

        $verification = SmsVerification::query()
            ->where('scene', SmsVerification::SCENE_PARTICIPANT_LOGIN)
            ->where('mobile', $data['mobile'])
            ->where('status', SmsVerification::STATUS_SENT)
            ->where('expires_at', '>', now())
            ->latest('id')
            ->first();

        if ($verification === null || $verification->code !== $data['code']) {
            throw ValidationException::withMessages([
                'code' => ['验证码无效或已过期'],
            ]);
        }

        $user = DB::transaction(function () use ($data, $verification) {
            $verification = SmsVerification::query()
                ->whereKey($verification->id)
                ->where('scene', SmsVerification::SCENE_PARTICIPANT_LOGIN)
                ->where('mobile', $data['mobile'])
                ->where('status', SmsVerification::STATUS_SENT)
                ->where('expires_at', '>', now())
                ->lockForUpdate()
                ->first();

            if ($verification === null || $verification->code !== $data['code']) {
                throw ValidationException::withMessages([
                    'code' => ['验证码无效或已过期'],
                ]);
            }

            $competition = Competition::query()
                ->where('slug', $data['competition_slug'])
                ->where('published', true)
                ->first();

            if ($competition === null) {
                throw ValidationException::withMessages([
                    'competition_slug' => ['赛事不存在或未发布'],
                ]);
            }

            $user = User::query()->firstOrCreate(
                ['mobile' => $data['mobile']],
                ['name' => null, 'email' => null, 'password' => null]
            );

            if ($user->wasRecentlyCreated) {
                $this->attributePublicSource($user, (string) ($data['public_source_code'] ?? ''));
            }

            Application::firstOrCreateDraft($user->id, $competition->id);

            $verification->forceFill([
                'status' => SmsVerification::STATUS_USED,
                'used_at' => now(),
            ])->save();

            $this->expirePreviousVerifications($data['mobile'], $verification->id);

            return $user;
        });

        $user->tokens()->delete();
        $token = $user->createToken('web')->plainTextToken;

        return response()->json([
            'token' => $token,
            'token_type' => 'Bearer',
            'user' => [
                'id' => $user->id,
                'mobile' => $user->mobile,
                'name' => $user->name,
                'email' => $user->email,
                'company' => $user->company,
            ],
        ]);
    }

    private function attributePublicSource(User $user, string $sourceCode): void
    {
        $sourceCode = trim($sourceCode);
        if (! preg_match('/^[A-Za-z0-9_-]{2,64}$/', $sourceCode)) {
            return;
        }

        $channel = PublicSourceChannel::query()
            ->where('source_code', $sourceCode)
            ->where('status', PublicSourceChannel::STATUS_ENABLED)
            ->first();

        if ($channel === null) {
            return;
        }

        $user->forceFill([
            'public_source_channel_id' => $channel->id,
            'public_source_code' => $channel->source_code,
            'public_source_attributed_at' => now(),
        ])->save();
    }

    private function expirePreviousVerifications(string $mobile, int $currentId): void
    {
        SmsVerification::query()
            ->where('scene', SmsVerification::SCENE_PARTICIPANT_LOGIN)
            ->where('mobile', $mobile)
            ->where('id', '<>', $currentId)
            ->whereIn('status', [
                SmsVerification::STATUS_PENDING,
                SmsVerification::STATUS_SENT,
            ])
            ->update(['status' => SmsVerification::STATUS_EXPIRED]);
    }
}