<?php

namespace Longyi\Wholesale\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Routing\Controller;
use Illuminate\Support\Facades\RateLimiter;
use Longyi\Wholesale\Helpers\ApiResponse;
use Longyi\Wholesale\Models\Message;

class WholesaleController extends Controller
{
    /**
     * 短窗口：同一 IP 允许的最大提交次数（60 秒内最多 1 次）。
     */
    const MAX_ATTEMPTS = 1;

    /**
     * 短窗口时长（秒）。
     */
    const DECAY_SECONDS = 60;

    /**
     * 长窗口：同一 IP 允许的最大提交次数（24 小时内最多 5 次）。
     */
    const DAILY_MAX_ATTEMPTS = 5;

    /**
     * 长窗口时长（秒）：24 小时。
     */
    const DAILY_DECAY_SECONDS = 86400;

    /**
     * 重复提交去重窗口（秒）：同一 IP 相同邮箱在该时间内只允许提交一次。
     */
    const DUPLICATE_SECONDS = 60;

    /**
     * Store a new wholesale enquiry.
     *
     * POST /api/wholesale
     */
    public function store(Request $request)
    {
        $ip = $request->ip();

        // 1. IP 级限流，防止高频恶意提交。
        //    短窗口：60 秒内最多 1 次。
        $throttleKey = 'wholesale-submit:'.$ip;

        if (RateLimiter::tooManyAttempts($throttleKey, self::MAX_ATTEMPTS)) {
            return ApiResponse::error(
                trans('wholesale::app.shop.too-many-attempts'),
                [],
                429
            );
        }

        //    长窗口：24 小时内最多 5 次。
        $dailyThrottleKey = 'wholesale-submit-daily:'.$ip;

        if (RateLimiter::tooManyAttempts($dailyThrottleKey, self::DAILY_MAX_ATTEMPTS)) {
            return ApiResponse::error(
                trans('wholesale::app.shop.too-many-attempts'),
                [],
                429
            );
        }

        RateLimiter::hit($throttleKey, self::DECAY_SECONDS);
        RateLimiter::hit($dailyThrottleKey, self::DAILY_DECAY_SECONDS);

        // 2. 重复提交检测：同一 IP + 邮箱在窗口期内只允许提交一次。
        $duplicateKey = 'wholesale-dup:'.md5($ip.'|'.strtolower((string) $request->input('email')));

        if (cache()->has($duplicateKey)) {
            return ApiResponse::error(
                trans('wholesale::app.shop.duplicate-submission'),
                [],
                429
            );
        }

        try {
            $validated = $request->validate([
                'name'          => 'required|string|max:200',
                'email'         => 'required|email|max:50',
                'number'        => 'nullable|string|max:300',
                'message'       => 'nullable|string|max:600',
                'country'       => 'nullable|string|max:50',
                'business_name' => 'nullable|string|max:300',
                'business_role' => 'nullable|string|max:50',
            ]);

            $message = Message::create([
                'name'          => $validated['name'],
                'Email'         => $validated['email'],
                'number'        => $validated['number'] ?? null,
                'message'       => $validated['message'] ?? null,
                'country'       => $validated['country'] ?? null,
                'business_name' => $validated['business_name'] ?? '',
                'business_role' => $validated['business_role'] ?? '',
            ]);

            // 记录去重标记，窗口期内重复提交会被拒绝。
            cache()->put($duplicateKey, $message->message_id, self::DUPLICATE_SECONDS);

            return ApiResponse::success([
                'id' => $message->message_id,
            ], trans('wholesale::app.shop.success'));
        } catch (\Exception $e) {
            return ApiResponse::error($e->getMessage());
        }
    }
}