<?php
declare(strict_types=1);

namespace app\api\logic;

use app\api\cache\UserCache;
use app\api\service\LotteryService;
use app\dice\model\lottery_config\DiceLotteryConfig;
use app\dice\model\play_record\DicePlayRecord;
use app\dice\model\player\DicePlayer;
use app\dice\model\player_ticket_record\DicePlayerTicketRecord;
use app\dice\model\player_wallet_record\DicePlayerWalletRecord;
use app\dice\model\reward_config\DiceRewardConfig;
use plugin\saiadmin\exception\ApiException;
use support\think\Cache;
use support\think\Db;

/**
 * 开始游戏 / 抽奖一局
 */
class PlayStartLogic
{
    /** 抽奖类型：付费 */
    public const LOTTERY_TYPE_PAID = 0;
    /** 抽奖类型：免费 */
    public const LOTTERY_TYPE_FREE = 1;
    /** 钱包流水类型：抽奖 */
    public const WALLET_TYPE_DRAW = 5;
    /** 对局状态：成功 */
    public const RECORD_STATUS_SUCCESS = 1;
    /** 对局状态：超时/失败 */
    public const RECORD_STATUS_TIMEOUT = 0;

    /** 开启对局最低余额 = |DiceRewardConfig 最小 real_ev + 100| */
    private const MIN_COIN_EXTRA = 100;

    /**
     * 执行一局游戏
     * @param int $playerId 玩家ID
     * @param int $direction 方向 0=无/顺时针 1=中奖/逆时针（前端 rediction）
     * @return array 成功返回 DicePlayRecord 数据；余额不足时抛 ApiException，message 为约定文案
     */
    public function run(int $playerId, int $direction): array
    {
        $player = DicePlayer::find($playerId);
        if (!$player) {
            throw new ApiException('用户不存在');
        }

        $minEv = (float) DiceRewardConfig::min('real_ev');
        $minCoin = abs($minEv + self::MIN_COIN_EXTRA);
        $coin = (float) $player->coin;
        if ($coin < $minCoin) {
            throw new ApiException('当前玩家余额小于DiceRewardConfigMin.real_ev+100无法继续游戏');
        }

        $paid = (int) ($player->paid_draw_count ?? 0);
        $free = (int) ($player->free_draw_count ?? 0);
        if ($paid + $free <= 0) {
            throw new ApiException('抽奖券不足');
        }

        $lotteryService = LotteryService::getOrCreate($playerId);
        $ticketType = LotteryService::drawTicketType($paid, $free);
        $config = $ticketType === self::LOTTERY_TYPE_PAID
            ? ($lotteryService->getConfigType0Id() ? DiceLotteryConfig::find($lotteryService->getConfigType0Id()) : null)
            : ($lotteryService->getConfigType1Id() ? DiceLotteryConfig::find($lotteryService->getConfigType1Id()) : null);
        if (!$config) {
            throw new ApiException('奖池配置不存在');
        }

        $tier = LotteryService::drawTierByWeights($config);
        $rewards = DiceRewardConfig::where('tier', $tier)->select();
        if ($rewards->isEmpty()) {
            throw new ApiException('该档位暂无奖励配置');
        }
        $rewardList = $rewards->all();
        $reward = $rewardList[array_rand($rewardList)];
        $realEv = (float) $reward->real_ev;
        $winCoin = 100 + $realEv; // 赢取平台币 = 100 + DiceRewardConfig.real_ev
        $gridNumber = (int) $reward->grid_number;
        $startIndex = (int) Cache::get(LotteryService::getStartIndexKey($playerId), 0);
        $targetIndex = (int) $reward->id;
        $rollArray = $this->generateRollArray($gridNumber);

        $record = null;
        $configId = (int) $config->id;
        $rewardId = (int) $reward->id;
        $configName = (string) ($config->name ?? '');
        $isTierT5 = (string) ($reward->tier ?? '') === 'T5';
        try {
            Db::transaction(function () use (
                $playerId,
                $configId,
                $rewardId,
                $configName,
                $ticketType,
                $winCoin,
                $realEv,
                $direction,
                $startIndex,
                $targetIndex,
                $rollArray,
                $isTierT5,
                &$record
            ) {
                $record = DicePlayRecord::create([
                    'player_id'          => $playerId,
                    'lottery_config_id'  => $configId,
                    'lottery_type'       => $ticketType,
                    'win_coin'           => $winCoin,
                    'direction'          => $direction,
                    'reward_config_id'   => $rewardId,
                    'start_index'        => $startIndex,
                    'target_index'       => $targetIndex,
                    'roll_array'         => is_array($rollArray) ? json_encode($rollArray) : $rollArray,
                    'lottery_name'       => $configName,
                    'status'             => self::RECORD_STATUS_SUCCESS,
                ]);

                $p = DicePlayer::find($playerId);
                if (!$p) {
                    throw new \RuntimeException('玩家不存在');
                }
                $coinBefore = (float) $p->coin;
                $coinAfter = $coinBefore + $winCoin;
                $p->coin = $coinAfter;
                $p->total_draw_count = max(0, (int) $p->total_draw_count - 1);
                if ($ticketType === self::LOTTERY_TYPE_PAID) {
                    $p->paid_draw_count = max(0, (int) $p->paid_draw_count - 1);
                } else {
                    $p->free_draw_count = max(0, (int) $p->free_draw_count - 1);
                }

                // 若本局中奖档位为 T5，则额外赠送 1 次免费抽奖次数（总次数也 +1），并记录抽奖券获取记录
                if ($isTierT5) {
                    $p->free_draw_count = (int) $p->free_draw_count + 1;
                    $p->total_draw_count = (int) $p->total_draw_count + 1;

                    DicePlayerTicketRecord::create([
                        'player_id'       => $playerId,
                        'free_draw_count' => 1,
                        'remark'          => '中奖结果为T5',
                    ]);
                }

                $p->save();

                // 累加彩金池盈利额度（累加值为 -real_ev）。若 dice_lottery_config 表有 ev 字段则执行
                try {
                    DiceLotteryConfig::where('id', $configId)->update([
                        'ev' => Db::raw('IFNULL(ev,0) - ' . (float) $realEv),
                    ]);
                } catch (\Throwable $_) {
                }

                DicePlayerWalletRecord::create([
                    'player_id'      => $playerId,
                    'coin'           => $winCoin,
                    'type'           => self::WALLET_TYPE_DRAW,
                    'wallet_before'  => $coinBefore,
                    'wallet_after'   => $coinAfter,
                    'remark'         => '抽奖|play_record_id=' . $record->id,
                ]);

                Cache::set(LotteryService::getStartIndexKey($playerId), $targetIndex, 86400 * 30);
            });
        } catch (\Throwable $e) {
            if ($record === null) {
                try {
                    $record = DicePlayRecord::create([
                        'player_id'          => $playerId,
                        'lottery_config_id'  => $configId ?? 0,
                        'lottery_type'       => $ticketType,
                        'win_coin'           => 0,
                        'direction'          => $direction,
                        'reward_config_id'   => 0,
                        'start_index'        => $startIndex,
                        'target_index'       => 0,
                        'roll_array'         => '[]',
                        'status'             => self::RECORD_STATUS_TIMEOUT,
                    ]);
                } catch (\Throwable $_) {
                    // 表可能无 status 字段时忽略
                }
            }
            throw $e;
        }

        $updated = DicePlayer::find($playerId);
        if ($updated) {
            UserCache::setUser($playerId, $updated->hidden(['password'])->toArray());
        }

        if (!$record instanceof DicePlayRecord) {
            throw new \RuntimeException('对局记录创建失败');
        }
        $arr = $record->toArray();
        if (isset($arr['roll_array']) && is_string($arr['roll_array'])) {
            $arr['roll_array'] = json_decode($arr['roll_array'], true) ?? [];
        }
        return $arr;
    }

    /** 生成 5 个 1-6 的点数，和为 grid_number（5~30），严格不超范围 */
    private function generateRollArray(int $gridNumber): array
    {
        $minSum = 5;
        $maxSum = 30;
        $n = max($minSum, min($maxSum, $gridNumber));
        $dice = [1, 1, 1, 1, 1];
        $remain = $n - 5;
        while ($remain > 0) {
            $i = array_rand($dice);
            if ($dice[$i] < 6) {
                $add = min($remain, 6 - $dice[$i]);
                $dice[$i] += $add;
                $remain -= $add;
            }
        }
        shuffle($dice);
        return $dice;
    }
}