<?php

namespace App\Http\Controllers\Game;

use App\Http\logic\api\CouponLogic;
use App\Models\UserCoupon;
use Illuminate\Http\Request;

/**
 * 优惠券 API 控制器
 *
 * 路由:
 *   GET  /coupon/list    获取用户优惠券列表（自动发放）
 *   POST /coupon/preview 预估优惠券赠送金额（充值前调用）
 */
class CouponController
{
    /**
     * 获取用户优惠券列表
     *
     * 同时触发自动发放逻辑：根据配置策略检查用户是否符合条件并自动发放。
     *
     * GET /api/coupon/list
     * 参数: userID (必填)
     *
     * 响应:
     * {
     *   "code": 200,
     *   "msg": "success",
     *   "data": {
     *     "list": [...],       // 当前可用优惠券
     *     "new_issued": [...]   // 本次新发放的优惠券
     *   }
     * }
     */
    public function list(Request $request)
    {
        // game.php 中间件设置 globalUser；api.php 使用 userID 参数
        $userId = (int) ($request->globalUser->UserID ?? $request->input('userID', 0));

        if ($userId <= 0) {
            return apiReturnFail('Invalid userID');
        }

        $logic = new CouponLogic();
        $data = $logic->getList($userId);

        return apiReturnSuc($data);
    }

    /**
     * 预估优惠券赠送金额（充值前调用）
     *
     * 用户在充值页面选择优惠券后，可调用此接口查看预计赠送金额。
     *
     * POST /api/coupon/preview
     * 参数: userID (必填), coupon_id (必填), payAmt (必填, 充值金额元)
     *
     * 响应:
     * {
     *   "code": 200,
     *   "msg": "success",
     *   "data": {
     *     "coupon_id": 1,
     *     "bonus_amount": 10.00,    // 赠送金额(元)
     *     "bonus_coins": 1000,      // 赠送金币(分)
     *     "total_amount": 60.00     // 到账总额(元) = 充值 + 赠送
     *   }
     * }
     */
    public function preview(Request $request)
    {
        // game.php 中间件设置 globalUser；api.php 使用 userID 参数
        $userId = (int) ($request->globalUser->UserID ?? $request->input('userID', 0));
        $couponId = (int) $request->input('coupon_id');
        $payAmt = (float) $request->input('payAmt');

        if ($userId <= 0 || $couponId <= 0 || $payAmt <= 0) {
            return apiReturnFail('Invalid parameters');
        }

        $logic = new CouponLogic();
        $coupon = $logic->validateForPayment($couponId, $userId, $payAmt);

        if ($coupon === false) {
            return apiReturnFail($logic->getError());
        }

        $couponService = new \App\Services\CouponService();
        $bonusCoins = $couponService->calcBonusCoins($coupon, $payAmt);
        $bonusAmount = $bonusCoins / 100; // 分转元

        return apiReturnSuc([
            'coupon_id'    => $couponId,
            'bonus_amount' => round($bonusAmount, 2),
            'bonus_coins'  => $bonusCoins,
            'total_amount' => round($payAmt + $bonusAmount, 2),
        ]);
    }
}