<?php
declare(strict_types=1);

namespace app\api\service;

use app\dice\model\lottery_config\DiceLotteryConfig;
use app\dice\model\player\DicePlayer;
use support\think\Cache;

/**
 * 彩金池实例，按玩家权重与奖池配置创建，存 Redis 便于增删改查
 */
class LotteryService
{
    private const REDIS_KEY_PREFIX = 'api:game:lottery_pool:';
    private const REDIS_KEY_START_INDEX = 'api:game:start_index:';
    private const EXPIRE = 86400 * 7; // 7天

    private int $playerId;
    private ?int $configType0Id = null;
    private ?int $configType1Id = null;
    /** @var array{t1_wight?:int,t2_wight?:int,t3_wight?:int,t4_wight?:int,t5_wight?:int} */
    private array $playerWeights = [];

    public function __construct(int $playerId)
    {
        $this->playerId = $playerId;
    }

    public static function getRedisKey(int $playerId): string
    {
        return self::REDIS_KEY_PREFIX . $playerId;
    }

    public static function getStartIndexKey(int $playerId): string
    {
        return self::REDIS_KEY_START_INDEX . $playerId;
    }

    /** 从 Redis 加载或根据玩家与 DiceLotteryConfig 创建并保存 */
    public static function getOrCreate(int $playerId): self
    {
        $key = self::getRedisKey($playerId);
        $cached = Cache::get($key);
        if ($cached && is_string($cached)) {
            $data = json_decode($cached, true);
            if (is_array($data)) {
                $s = new self($playerId);
                $s->configType0Id = (int) ($data['config_type_0_id'] ?? 0);
                $s->configType1Id = (int) ($data['config_type_1_id'] ?? 0);
                $s->playerWeights = $data['player_weights'] ?? [];
                return $s;
            }
        }
        $player = DicePlayer::find($playerId);
        if (!$player) {
            throw new \RuntimeException('玩家不存在');
        }
        $config0 = DiceLotteryConfig::where('type', 0)->find();
        $config1 = DiceLotteryConfig::where('type', 1)->find();
        $s = new self($playerId);
        $s->configType0Id = $config0 ? (int) $config0->id : null;
        $s->configType1Id = $config1 ? (int) $config1->id : null;
        $s->playerWeights = [
            't1_wight' => (int) ($player->t1_wight ?? 0),
            't2_wight' => (int) ($player->t2_wight ?? 0),
            't3_wight' => (int) ($player->t3_wight ?? 0),
            't4_wight' => (int) ($player->t4_wight ?? 0),
            't5_wight' => (int) ($player->t5_wight ?? 0),
        ];
        $s->save();
        return $s;
    }

    public function save(): void
    {
        $key = self::getRedisKey($this->playerId);
        $data = [
            'config_type_0_id' => $this->configType0Id,
            'config_type_1_id' => $this->configType1Id,
            'player_weights'   => $this->playerWeights,
        ];
        Cache::set($key, json_encode($data), self::EXPIRE);
    }

    /** 根据奖池配置的 t1_wight..t5_wight 权重随机抽取档位 T1-T5 */
    public static function drawTierByWeights(DiceLotteryConfig $config): string
    {
        $tiers = ['T1', 'T2', 'T3', 'T4', 'T5'];
        $weights = [
            (int) ($config->t1_wight ?? 0),
            (int) ($config->t2_wight ?? 0),
            (int) ($config->t3_wight ?? 0),
            (int) ($config->t4_wight ?? 0),
            (int) ($config->t5_wight ?? 0),
        ];
        $total = array_sum($weights);
        if ($total <= 0) {
            return $tiers[array_rand($tiers)];
        }
        $r = mt_rand(1, $total);
        $acc = 0;
        foreach ($weights as $i => $w) {
            $acc += $w;
            if ($r <= $acc) {
                return $tiers[$i];
            }
        }
        return $tiers[4];
    }

    /** 按 paid_ticket_count 与 free_ticket_count 权重随机抽取 0=付费 1=免费 */
    public static function drawTicketType(int $paid, int $free): int
    {
        if ($paid <= 0 && $free <= 0) {
            throw new \RuntimeException('抽奖券不足');
        }
        if ($paid <= 0) {
            return 1;
        }
        if ($free <= 0) {
            return 0;
        }
        $total = $paid + $free;
        $r = mt_rand(1, $total);
        return $r <= $paid ? 0 : 1;
    }

    public function getConfigType0Id(): ?int
    {
        return $this->configType0Id;
    }

    public function getConfigType1Id(): ?int
    {
        return $this->configType1Id;
    }
}