/**
 * 缓存管理工具
 */

const REWARD_CACHE_KEY = 'reward_cache_v2'  // v2: 修复概率精度问题
const MATCHING_GAME_CACHE_KEY = 'matching_game_cache_v1'
const MATCHING_GAME_TIMESTAMP_KEY = 'matching_game_last_timestamp' // 对对碰最后获取卡片数据的时间

/**
 * 判断缓存是否新鲜
 * @param {number} timestamp - 缓存时间戳
 * @param {number} ttl - 有效期（毫秒），默认24小时
 * @returns {boolean}
 */
export function isFresh(timestamp, ttl = 24 * 60 * 60 * 1000) {
    const now = Date.now()
    const v = Number(timestamp || 0)
    return now - v < ttl
}

/**
 * 获取奖励缓存
 * @returns {Object}
 */
export function getRewardCache() {
    const obj = uni.getStorageSync(REWARD_CACHE_KEY) || {}
    return typeof obj === 'object' && obj ? obj : {}
}

/**
 * 设置奖励缓存
 * @param {string} activityId - 活动ID
 * @param {string} issueId - 期ID
 * @param {any} value - 缓存值
 */
export function setRewardCache(activityId, issueId, value) {
    const cache = getRewardCache()
    const act = cache[activityId] || {}
    act[issueId] = { value, ts: Date.now() }
    cache[activityId] = act
    uni.setStorageSync(REWARD_CACHE_KEY, cache)
}

/**
 * 获取奖励缓存项
 * @param {string} activityId - 活动ID
 * @param {string} issueId - 期ID
 * @returns {any|null}
 */
export function getRewardCacheItem(activityId, issueId) {
    const cache = getRewardCache()
    const act = cache[activityId] || {}
    const c = act[issueId]
    if (c && isFresh(c.ts) && Array.isArray(c.value)) {
        return c.value
    }
    return null
}

/**
 * 获取对对碰游戏缓存
 * @returns {Object}
 */
export function getMatchingGameCache() {
    const obj = uni.getStorageSync(MATCHING_GAME_CACHE_KEY) || {}
    return typeof obj === 'object' && obj ? obj : {}
}

/**
 * 读取对对碰游戏缓存项
 * @param {string} activityId - 活动ID
 * @param {string} issueId - 期ID
 * @returns {Object|null}
 */
export function readMatchingGameCacheEntry(activityId, issueId) {
    const activityKey = String(activityId || '')
    const issueKey = String(issueId || '')
    if (!activityKey || !issueKey) return null
    const cache = getMatchingGameCache()
    const act = cache[activityKey] || {}
    const entry = act && act[issueKey]
    const ok = entry && typeof entry === 'object' && entry.game_id
    return ok ? entry : null
}

/**
 * 写入对对碰游戏缓存项
 * @param {string} activityId - 活动ID
 * @param {string} issueId - 期ID
 * @param {Object} entry - 缓存数据
 */
export function writeMatchingGameCacheEntry(activityId, issueId, entry) {
    const activityKey = String(activityId || '')
    const issueKey = String(issueId || '')
    if (!activityKey || !issueKey) return
    const cache = getMatchingGameCache()

    // 清理超过170秒的缓存记录
    const now = Date.now()
    const TTL = 170 * 1000 // 170秒

    // 遍历所有活动的所有期，删除过期的缓存
    for (const actKey in cache) {
        const act = cache[actKey]
        if (!act || typeof act !== 'object') continue

        for (const issKey in act) {
            const entry = act[issKey]
            if (!entry || typeof entry !== 'object') continue

            const ts = Number(entry.ts || 0)
            if (now - ts >= TTL) {
                // 超过170秒，删除此缓存记录
                delete act[issKey]
            }
        }

        // 如果该活动下没有任何期了，删除活动
        if (Object.keys(act).length === 0) {
            delete cache[actKey]
        }
    }

    // 写入新的缓存
    const act = (cache[activityKey] && typeof cache[activityKey] === 'object') ? cache[activityKey] : {}
    act[issueKey] = entry
    cache[activityKey] = act
    uni.setStorageSync(MATCHING_GAME_CACHE_KEY, cache)
}

/**
 * 清除对对碰游戏缓存项
 * @param {string} activityId - 活动ID
 * @param {string} issueId - 期ID
 */
export function clearMatchingGameCacheEntry(activityId, issueId) {
    const activityKey = String(activityId || '')
    const issueKey = String(issueId || '')
    const cache = getMatchingGameCache()
    const act = cache[activityKey]
    if (!act || typeof act !== 'object') return
    if (act[issueKey] !== undefined) delete act[issueKey]
    if (Object.keys(act).length === 0) delete cache[activityKey]
    else cache[activityKey] = act
    uni.setStorageSync(MATCHING_GAME_CACHE_KEY, cache)
}

/**
 * 查找最新的对对碰游戏缓存
 * @param {string} activityId - 活动ID
 * @returns {Object|null}
 */
export function findLatestMatchingGameCacheEntry(activityId) {
    const activityKey = String(activityId || '')
    if (!activityKey) return null
    const cache = getMatchingGameCache()
    const act = cache[activityKey]
    if (!act || typeof act !== 'object') return null
    let bestIssueId = ''
    let bestEntry = null
    let bestTs = -Infinity
    Object.keys(act).forEach(issueId => {
        const entry = act[issueId]
        if (!entry || typeof entry !== 'object' || !entry.game_id) return
        const ts = Number(entry.ts || 0)
        if (!bestEntry || ts > bestTs) {
            bestTs = ts
            bestIssueId = issueId
            bestEntry = entry
        }
    })
    if (!bestEntry) return null
    return { issue_id: bestIssueId, entry: bestEntry }
}

/**
 * 记录对对碰游戏卡片获取时间戳
 * 当成功调用 /api/app/matching/cards 接口时调用
 */
export function recordMatchingGameCardsTimestamp() {
    const timestamp = Date.now()
    uni.setStorageSync(MATCHING_GAME_TIMESTAMP_KEY, timestamp)
    console.log('[MatchingGame] 记录卡片获取时间戳:', new Date(timestamp).toISOString())
}

/**
 * 检查对对碰游戏缓存是否过期
 * @param {number} maxAgeSeconds - 最大有效期（秒），默认100秒
 * @returns {boolean} true表示未过期，false表示已过期
 */
export function isMatchingGameCacheValid(maxAgeSeconds = 100) {
    const timestamp = uni.getStorageSync(MATCHING_GAME_TIMESTAMP_KEY)
    if (!timestamp) return false

    const now = Date.now()
    const ageSeconds = (now - timestamp) / 1000
    const isValid = ageSeconds < maxAgeSeconds

    console.log('[MatchingGame] 检查缓存有效期:', {
        timestamp: new Date(timestamp).toISOString(),
        now: new Date(now).toISOString(),
        ageSeconds: ageSeconds.toFixed(2),
        maxAgeSeconds,
        isValid
    })

    return isValid
}

/**
 * 清除对对碰游戏缓存和时间戳
 */
export function clearMatchingGameAllCache() {
    uni.removeStorageSync(MATCHING_GAME_CACHE_KEY)
    uni.removeStorageSync(MATCHING_GAME_TIMESTAMP_KEY)
    console.log('[MatchingGame] 已清除所有对对碰缓存')
}