<?php

namespace App\Module\Game\Logics;

/**
 * 扣除数据收集逻辑
 * 
 * 使用静态变量收集本次请求中的所有扣除数据
 * 区别于LastData（变化但未同步的），这里收集的是本次请求的扣除
 */
class DeductCollectorLogic
{
    /**
     * 物品扣除数据，按用户分组
     * 格式：[user_id => [item_key => ['user_id' => int, 'item_id' => int, 'instance_id' => int, 'quantity' => int]]]
     *
     * @var array
     */
    private static array $itemDeducts = [];

    /**
     * 代币扣除数据，按用户分组
     * 格式：[user_id => [coin_type => ['user_id' => int, 'type' => int, 'quantity' => int]]]
     *
     * @var array
     */
    private static array $coinDeducts = [];

    /**
     * 添加物品扣除
     *
     * @param int $userId 用户ID
     * @param int $itemId 物品ID
     * @param int $instanceId 物品实例ID
     * @param int $quantity 扣除数量
     * @return void
     */
    public static function addItemDeduct(int $userId, int $itemId, int $instanceId, int $quantity): void
    {
        $key = "{$itemId}_{$instanceId}";

        if (!isset(self::$itemDeducts[$userId])) {
            self::$itemDeducts[$userId] = [];
        }

        if (isset(self::$itemDeducts[$userId][$key])) {
            // 如果已存在，累加数量
            self::$itemDeducts[$userId][$key]['quantity'] += $quantity;
        } else {
            // 新增扣除记录
            self::$itemDeducts[$userId][$key] = [
                'user_id' => $userId,
                'item_id' => $itemId,
                'instance_id' => $instanceId,
                'quantity' => $quantity,
            ];
        }
    }

    /**
     * 添加代币扣除
     *
     * @param int $userId 用户ID
     * @param int $coinType 代币类型
     * @param int $quantity 扣除数量
     * @return void
     */
    public static function addCoinDeduct(int $userId, int $coinType, int $quantity): void
    {
        if (!isset(self::$coinDeducts[$userId])) {
            self::$coinDeducts[$userId] = [];
        }

        if (isset(self::$coinDeducts[$userId][$coinType])) {
            // 如果已存在，累加数量
            self::$coinDeducts[$userId][$coinType]['quantity'] += $quantity;
        } else {
            // 新增扣除记录
            self::$coinDeducts[$userId][$coinType] = [
                'user_id' => $userId,
                'type' => $coinType,
                'quantity' => $quantity,
            ];
        }
    }

    /**
     * 获取本次请求的所有扣除数据
     *
     * @param int|null $userId 用户ID，如果为null则返回所有用户的数据
     * @return array 扣除数据数组，包含items和coins
     */
    public static function getDeducts(?int $userId = null): array
    {
        if ($userId !== null) {
            // 返回指定用户的扣除数据
            return [
                'items' => array_values(self::$itemDeducts[$userId] ?? []),
                'coins' => array_values(self::$coinDeducts[$userId] ?? []),
            ];
        }

        // 返回所有用户的扣除数据，合并为一个数组
        $allItems = [];
        $allCoins = [];

        foreach (self::$itemDeducts as $userItems) {
            $allItems = array_merge($allItems, array_values($userItems));
        }

        foreach (self::$coinDeducts as $userCoins) {
            $allCoins = array_merge($allCoins, array_values($userCoins));
        }

        return [
            'items' => $allItems,
            'coins' => $allCoins,
        ];
    }

    /**
     * 清空本次请求的扣除数据
     *
     * @return void
     */
    public static function clearDeducts(): void
    {
        self::$itemDeducts = [];
        self::$coinDeducts = [];
    }

    /**
     * 检查是否有扣除数据
     *
     * @param int|null $userId 用户ID，如果为null则检查所有用户
     * @return bool
     */
    public static function hasDeducts(?int $userId = null): bool
    {
        if ($userId !== null) {
            return !empty(self::$itemDeducts[$userId]) || !empty(self::$coinDeducts[$userId]);
        }

        return !empty(self::$itemDeducts) || !empty(self::$coinDeducts);
    }

    /**
     * 获取物品扣除数据
     *
     * @param int|null $userId 用户ID，如果为null则返回所有用户的数据
     * @return array
     */
    public static function getItemDeducts(?int $userId = null): array
    {
        if ($userId !== null) {
            return array_values(self::$itemDeducts[$userId] ?? []);
        }

        $allItems = [];
        foreach (self::$itemDeducts as $userItems) {
            $allItems = array_merge($allItems, array_values($userItems));
        }
        return $allItems;
    }

    /**
     * 获取代币扣除数据
     *
     * @param int|null $userId 用户ID，如果为null则返回所有用户的数据
     * @return array
     */
    public static function getCoinDeducts(?int $userId = null): array
    {
        if ($userId !== null) {
            return array_values(self::$coinDeducts[$userId] ?? []);
        }

        $allItems = [];
        foreach (self::$coinDeducts as $userCoins) {
            $allItems = array_merge($allItems, array_values($userCoins));
        }
        return $allItems;
    }
}