/**
 * 游戏进度持久化：关卡、星级、连胜、每日打卡
 */
import { ref } from 'vue'
import { calcLevelStars } from '../data/gameLevels.js'

const STORAGE_KEY = 'tongji_game_progress_v1'

const DEFAULT = {
    currentLevel: 1,
    maxUnlocked: 1,
    stars: {},
    winStreak: 0,
    dailyStreak: 0,
    lastPlayDate: '',
    totalWins: 0,
    bestCombo: 0,
    totalStars: 0
}

function todayStr() {
    const d = new Date()
    return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`
}

function sumStars(starsMap) {
    return Object.values(starsMap || {}).reduce((s, n) => s + (Number(n) || 0), 0)
}

function loadRaw() {
    try {
        const raw = uni.getStorageSync(STORAGE_KEY)
        if (raw && typeof raw === 'object') return { ...DEFAULT, ...raw }
    } catch (_) {}
    return { ...DEFAULT }
}

function saveRaw(data) {
    try {
        uni.setStorageSync(STORAGE_KEY, data)
    } catch (_) {}
}

export function useGameProgress() {
    const progress = ref(loadRaw())

    function persist() {
        progress.value.totalStars = sumStars(progress.value.stars)
        saveRaw(progress.value)
    }

    /** 进入游戏时更新每日打卡 */
    function touchDailyPlay() {
        const today = todayStr()
        const last = progress.value.lastPlayDate
        if (last === today) return progress.value.dailyStreak

        const yesterday = new Date()
        yesterday.setDate(yesterday.getDate() - 1)
        const yStr = `${yesterday.getFullYear()}-${String(yesterday.getMonth() + 1).padStart(2, '0')}-${String(yesterday.getDate()).padStart(2, '0')}`

        if (last === yStr) {
            progress.value.dailyStreak = (progress.value.dailyStreak || 0) + 1
        } else {
            progress.value.dailyStreak = 1
        }
        progress.value.lastPlayDate = today
        persist()
        return progress.value.dailyStreak
    }

    function getStars(levelId) {
        return progress.value.stars[String(levelId)] || 0
    }

    function recordWin({ levelId, movesLeft, glucoseLevel, score, levelConfig, maxCombo }) {
        const stars = calcLevelStars({ movesLeft, glucoseLevel, score, levelConfig })
        const key = String(levelId)
        const prev = progress.value.stars[key] || 0
        if (stars > prev) progress.value.stars[key] = stars

        progress.value.winStreak = (progress.value.winStreak || 0) + 1
        progress.value.totalWins = (progress.value.totalWins || 0) + 1
        if (maxCombo > (progress.value.bestCombo || 0)) progress.value.bestCombo = maxCombo

        const next = levelId + 1
        if (next > progress.value.maxUnlocked) progress.value.maxUnlocked = next
        progress.value.currentLevel = next
        persist()
        return { stars, newBest: stars > prev }
    }

    function recordLoss() {
        progress.value.winStreak = 0
        persist()
    }

    function setCurrentLevel(levelId) {
        progress.value.currentLevel = Math.max(1, Math.min(progress.value.maxUnlocked, levelId))
        persist()
    }

    return {
        progress,
        touchDailyPlay,
        getStars,
        recordWin,
        recordLoss,
        setCurrentLevel,
        persist
    }
}