<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Application;
use App\Models\Competition;
use App\Models\User;
use App\Services\BtomSmsService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Validation\ValidationException;

class AuthSmsController extends Controller
{
    private function cacheKey(string $mobile): string
    {
        return 'sms_'.$mobile;
    }

    /** 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, BtomSmsService $sms): JsonResponse
    {
        $data = $request->validate([
            'mobile' => ['required', 'regex:/^1[3-9]\d{9}$/'],
        ]);

        $mobile = $data['mobile'];
        $key = $this->cacheKey($mobile);
        $check = Cache::get($key);

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

        $resendSec = (int) config('sms.resend_interval_seconds', 60);
        if (is_array($check) && isset($check['time']) && (time() - (int) $check['time']) <= $resendSec) {
            Log::warning('sms.send rate_limited', [
                'mobile_mask' => $this->maskMobile($mobile),
                'last_send_at' => $check['time'] ?? null,
                'resend_interval_seconds' => $resendSec,
            ]);
            throw ValidationException::withMessages([
                'mobile' => ['请勿频繁发送'],
            ]);
        }

        $code = (string) random_int(100000, 999999);
        $smsSign = (string) config('sms.sign');
        $content = "{$smsSign}您的验证码是：{$code}，验证码五分钟内有效，如非本人操作，请忽略。";

        $useMock = config('sms.mock')
            || config('sms.skip_gateway')
            || (config('app.debug') && empty(config('sms.app_id')) && empty(config('sms.secret')));

        Log::info('sms.send branch', [
            'mobile_mask' => $this->maskMobile($mobile),
            'use_mock' => $useMock,
            'sms_mock_config' => (bool) config('sms.mock'),
            'sms_skip_gateway' => (bool) config('sms.skip_gateway'),
            'app_debug' => (bool) config('app.debug'),
            'has_sms_credentials' => config('sms.app_id') !== '' && config('sms.secret') !== '',
        ]);

        if ($useMock) {
            Cache::put($key, ['code' => $code, 'time' => time()], 300);

            Log::info('sms.send mock_ok cache_set', [
                'mobile_mask' => $this->maskMobile($mobile),
                'code' => $code,
                'ttl_sec' => 300,
            ]);

            return response()->json([
                'message' => '发送成功',
                'debug_code' => $code,
            ]);
        }

        Log::info('sms.send gateway_call', ['mobile_mask' => $this->maskMobile($mobile)]);

        $result = $sms->sendContent($mobile, $content);
        if (! $result) {
            Log::warning('sms.send gateway_failed', ['mobile_mask' => $this->maskMobile($mobile)]);

            return response()->json([
                'message' => '发送失败',
            ], 422);
        }

        Cache::put($key, ['code' => $code, 'time' => time()], 300);

        Log::info('sms.send gateway_ok cache_set', [
            'mobile_mask' => $this->maskMobile($mobile),
            'debug_code_logged' => config('app.debug') ? $code : null,
        ]);

        return response()->json([
            'message' => '发送成功',
            'debug_code' => config('app.debug') ? $code : null,
        ]);
    }

    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'],
        ]);

        $key = $this->cacheKey($data['mobile']);
        $cached = Cache::get($key);

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

        $user = DB::transaction(function () use ($data, $key) {
            Cache::forget($key);

            $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]
            );

            Application::query()->firstOrCreate(
                [
                    'user_id' => $user->id,
                    'competition_id' => $competition->id,
                ],
                ['status' => 'draft']
            );

            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,
            ],
        ]);
    }
}