<?php

/**
 * 文件功能：百家乐前台下注控制器
 *
 * 提供用户在聊天室内下注的 API 接口：
 * - 查询当前局次信息
 * - 提交下注（扣除金币 + 写入下注记录）
 * - 查询本人在当前局的下注状态
 *
 * @author  ChatRoom Laravel
 *
 * @version 1.0.0
 */

namespace App\Http\Controllers;

use App\Enums\CurrencySource;
use App\Models\BaccaratBet;
use App\Models\BaccaratRound;
use App\Models\GameConfig;
use App\Services\UserCurrencyService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class BaccaratController extends Controller
{
    public function __construct(
        private readonly UserCurrencyService $currency,
    ) {}

    /**
     * 获取当前进行中的局次信息（前端轮询或开局事件后调用）。
     */
    public function currentRound(Request $request): JsonResponse
    {
        $round = BaccaratRound::currentRound();

        if (! $round) {
            return response()->json(['round' => null]);
        }

        $user = $request->user();
        $myBet = BaccaratBet::query()
            ->where('round_id', $round->id)
            ->where('user_id', $user->id)
            ->first();

        return response()->json([
            'round' => [
                'id' => $round->id,
                'status' => $round->status,
                'bet_closes_at' => $round->bet_closes_at->toIso8601String(),
                'seconds_left' => max(0, (int) now()->diffInSeconds($round->bet_closes_at, false)),
                'total_bet_big' => $round->total_bet_big,
                'total_bet_small' => $round->total_bet_small,
                'total_bet_triple' => $round->total_bet_triple,
                'bet_count_big' => $round->bet_count_big,
                'bet_count_small' => $round->bet_count_small,
                'bet_count_triple' => $round->bet_count_triple,
                'my_bet' => $myBet ? [
                    'bet_type' => $myBet->bet_type,
                    'amount' => $myBet->amount,
                ] : null,
            ],
        ]);
    }

    /**
     * 用户提交下注。
     *
     * 同一局每人限下一注（后台强制幂等）。
     * 下注成功后立即扣除金币，结算时中奖者才返还本金+赔付。
     */
    public function bet(Request $request): JsonResponse
    {
        if (! GameConfig::isEnabled('baccarat')) {
            return response()->json(['ok' => false, 'message' => '百家乐游戏当前未开启。']);
        }

        $data = $request->validate([
            'round_id' => 'required|integer|exists:baccarat_rounds,id',
            'bet_type' => 'required|in:big,small,triple',
            'amount' => 'required|integer|min:1',
        ]);

        $config = GameConfig::forGame('baccarat')?->params ?? [];
        $minBet = (int) ($config['min_bet'] ?? 100);
        $maxBet = (int) ($config['max_bet'] ?? 50000);

        if ($data['amount'] < $minBet || $data['amount'] > $maxBet) {
            return response()->json(['ok' => false, 'message' => "押注金额须在 {$minBet}~{$maxBet} 金币之间。"]);
        }

        $round = BaccaratRound::find($data['round_id']);

        if (! $round || ! $round->isBettingOpen()) {
            return response()->json(['ok' => false, 'message' => '当前不在下注时间内。']);
        }

        $user = $request->user();

        // 检查用户金币余额（金币字段为 jjb）
        if (($user->jjb ?? 0) < $data['amount']) {
            return response()->json(['ok' => false, 'message' => '金币不足，无法下注。']);
        }

        $currency = $this->currency;

        return DB::transaction(function () use ($user, $round, $data, $currency): JsonResponse {
            // 幂等：同一局只能下一注
            $existing = BaccaratBet::query()
                ->where('round_id', $round->id)
                ->where('user_id', $user->id)
                ->lockForUpdate()
                ->exists();

            if ($existing) {
                return response()->json(['ok' => false, 'message' => '本局您已下注，请等待开奖。']);
            }

            // 扣除金币
            $currency->change(
                $user,
                'gold',
                -$data['amount'],
                CurrencySource::BACCARAT_BET,
                "百家乐 #{$round->id} 押 ".match ($data['bet_type']) {
                    'big' => '大', 'small' => '小', default => '豹子'
                },
            );

            // 写入下注记录
            BaccaratBet::create([
                'round_id' => $round->id,
                'user_id' => $user->id,
                'bet_type' => $data['bet_type'],
                'amount' => $data['amount'],
                'status' => 'pending',
            ]);

            // 更新局次汇总统计
            $field = 'total_bet_'.$data['bet_type'];
            $countField = 'bet_count_'.$data['bet_type'];
            $round->increment($field, $data['amount']);
            $round->increment($countField);
            $round->increment('bet_count');

            // 广播各选项的最新押注人数
            event(new \App\Events\BaccaratPoolUpdated($round));

            $betLabel = match ($data['bet_type']) {
                'big' => '大', 'small' => '小', default => '豹子'
            };

            return response()->json([
                'ok' => true,
                'message' => "✅ 已押注「{$betLabel}」{$data['amount']} 金币，等待开奖！",
                'amount' => $data['amount'],
                'bet_type' => $data['bet_type'],
            ]);
        });
    }

    /**
     * 查询最近5局的历史记录（前端展示趋势）。
     */
    public function history(): JsonResponse
    {
        $rounds = BaccaratRound::query()
            ->where('status', 'settled')
            ->orderByDesc('id')
            ->limit(10)
            ->get(['id', 'dice1', 'dice2', 'dice3', 'total_points', 'result', 'settled_at']);

        return response()->json(['history' => $rounds]);
    }
}