// 分佈式內存管理器核心接口
interface DistributedMemoryManager {
    // 獲取設備內存信息
    getDeviceMemoryInfo(deviceId: string): MemoryInfo;
    
    // 申請分佈式內存塊
    allocateDistributedMemory(size: number, priority: MemoryPriority): DistributedMemoryBlock;
    
    // 釋放分佈式內存
    releaseDistributedMemory(block: DistributedMemoryBlock): void;
    
    // 內存壓力監控
    onMemoryPressure(callback: (pressure: MemoryPressure) => void): void;
}

// 內存信息結構
interface MemoryInfo {
    totalMemory: number;          // 總內存大小
    availableMemory: number;      // 可用內存
    threshold: number;           // 內存閾值
    isLowMemory: boolean;        // 是否低內存狀態
    distributedAvailable: boolean; // 是否支持分佈式內存
}

// 內存優先級枚舉
enum MemoryPriority {
    LOW = 0,      // 低優先級，可被優先回收
    NORMAL = 1,   // 正常優先級
    HIGH = 2,     // 高優先級，儘量保留
    CRITICAL = 3  // 關鍵優先級，系統盡力保證
}

// ArkTS對象生命週期示例
class MemorySensitiveComponent {
    private largeBuffer: ArrayBuffer | null = null;
    private resourceHandles: Set<ResourceHandle> = new Set();
    
    // 組件初始化時分配資源
    aboutToAppear() {
        // 分配大內存塊
        this.largeBuffer = new ArrayBuffer(1024 * 1024); // 1MB
        
        // 註冊資源句柄
        this.resourceHandles.add(this.acquireResource());
    }
    
    // 組件消失時釋放資源
    aboutToDisappear() {
        // 顯式釋放大內存塊
        this.largeBuffer = null;
        
        // 釋放所有資源句柄
        this.resourceHandles.forEach(handle => {
            this.releaseResource(handle);
        });
        this.resourceHandles.clear();
        
        // 強制垃圾回收（開發階段）
        if (DEBUG) {
            System.gc();
        }
    }
    
    // 內存敏感操作
    @PerformanceCritical
    processLargeData(data: number[]): void {
        // 使用內存池避免頻繁分配
        const buffer = MemoryPool.allocate(data.length * 4);
        try {
            // 處理數據...
            this.transformData(data, buffer);
        } finally {
            // 確保資源釋放
            MemoryPool.release(buffer);
        }
    }
}

// 內存泄漏檢測器
class MemoryLeakDetector {
    private static instance: MemoryLeakDetector;
    private trackedObjects: WeakMap<object, TrackingInfo> = new WeakMap();
    private allocationStackTraces: Map<number, StackTrace> = new Map();
    
    // 開始跟蹤對象
    trackObject(obj: object, description: string): void {
        const info: TrackingInfo = {
            description,
            allocationTime: Date.now(),
            stackTrace: this.captureStackTrace(),
            owner: this.getCurrentComponent()
        };
        
        this.trackedObjects.set(obj, info);
        this.allocationStackTraces.set(this.getObjectId(obj), info.stackTrace);
    }
    
    // 生成泄漏報告
    generateLeakReport(): LeakReport {
        const leaks: LeakInfo[] = [];
        const currentTime = Date.now();
        
        // 檢查長時間未釋放的對象
        for (const [obj, info] of this.trackedObjects) {
            const aliveTime = currentTime - info.allocationTime;
            if (aliveTime > LEAK_SUSPECT_THRESHOLD) {
                leaks.push({
                    description: info.description,
                    aliveTime,
                    allocationStack: info.stackTrace,
                    owner: info.owner,
                    size: this.estimateObjectSize(obj)
                });
            }
        }
        
        return {
            generatedAt: currentTime,
            totalLeaks: leaks.length,
            totalSize: leaks.reduce((sum, leak) => sum + leak.size, 0),
            leaks: leaks.sort((a, b) => b.size - a.size) // 按大小排序
        };
    }
    
    // 內存快照比較
    compareSnapshots(snapshot1: MemorySnapshot, snapshot2: MemorySnapshot): DeltaSnapshot {
        const added = [];
        const increased = [];
        
        for (const [key, size2] of snapshot2.entries()) {
            const size1 = snapshot1.get(key) || 0;
            if (size1 === 0) {
                added.push({ key, size: size2 });
            } else if (size2 > size1 * 1.5) { // 增長超過50%
                increased.push({ key, before: size1, after: size2, increase: size2 - size1 });
            }
        }
        
        return { added, increased };
    }
}

// 分佈式泄漏檢測器
class DistributedLeakDetector {
    private deviceDetectors: Map<string, MemoryLeakDetector> = new Map();
    
    // 開始跨設備泄漏檢測
    async startCrossDeviceDetection(): Promise<DistributedLeakReport> {
        const deviceReports = await Promise.all(
            Array.from(this.deviceDetectors.entries()).map(
                async ([deviceId, detector]) => {
                    const report = await detector.generateLeakReport();
                    return { deviceId, report };
                }
            )
        );
        
        // 聚合分析跨設備泄漏模式
        return this.analyzeCrossDevicePatterns(deviceReports);
    }
    
    // 分析跨設備泄漏模式
    private analyzeCrossDevicePatterns(
        deviceReports: DeviceLeakReport[]
    ): DistributedLeakReport {
        const crossDeviceLeaks: CrossDeviceLeak[] = [];
        const objectGraph = this.buildDistributedObjectGraph(deviceReports);
        
        // 檢測跨設備循環引用
        const cycles = this.findCrossDeviceCycles(objectGraph);
        
        // 檢測分佈式內存累積模式
        const accumulationPatterns = this.findAccumulationPatterns(deviceReports);
        
        return {
            timestamp: Date.now(),
            deviceReports,
            crossDeviceLeaks: cycles,
            accumulationPatterns,
            recommendations: this.generateOptimizationRecommendations(
                cycles, accumulationPatterns
            )
        };
    }
}

// 大對象分配器
class LargeObjectAllocator {
    private static readonly MIN_LARGE_OBJECT_SIZE = 1024 * 1024; // 1MB
    private memoryBlocks: Map<number, MemoryBlock> = new Map();
    private freeLists: Map<number, MemoryBlock[]> = new Map();
    
    // 分配大內存塊
    allocate(size: number, alignment: number = 8): LargeMemoryBlock {
        if (size < LargeObjectAllocator.MIN_LARGE_OBJECT_SIZE) {
            throw new Error('Use standard allocator for small objects');
        }
        
        // 嘗試從空閒列表獲取
        const alignedSize = this.alignSize(size, alignment);
        const block = this.tryGetFromFreeList(alignedSize);
        
        if (block) {
            return block;
        }
        
        // 分配新內存塊
        return this.allocateNewBlock(alignedSize);
    }
    
    // 釋放大內存塊
    release(block: LargeMemoryBlock): void {
        // 驗證塊完整性
        if (!this.validateBlock(block)) {
            console.error('Invalid memory block detected');
            return;
        }
        
        // 加入空閒列表以便重用
        this.addToFreeList(block);
        
        // 定期整理內存碎片
        if (this.shouldDefragment()) {
            this.defragmentMemory();
        }
    }
    
    // 內存碎片整理
    private defragmentMemory(): void {
        const blocks = Array.from(this.memoryBlocks.values())
            .filter(block => block.isFree)
            .sort((a, b) => a.address - b.address);
        
        for (let i = 0; i < blocks.length - 1; i++) {
            const current = blocks[i];
            const next = blocks[i + 1];
            
            // 合併相鄰空閒塊
            if (current.address + current.size === next.address) {
                this.mergeBlocks(current, next);
            }
        }
    }
}

// 通用對象池實現
class ObjectPool<T> {
    private pool: T[] = [];
    private createFunction: () => T;
    private resetFunction: (obj: T) => void;
    private maxSize: number;
    private currentSize: number = 0;
    
    constructor(
        create: () => T,
        reset: (obj: T) => void = (obj) => {},
        maxSize: number = 100
    ) {
        this.createFunction = create;
        this.resetFunction = reset;
        this.maxSize = maxSize;
    }
    
    // 獲取對象
    acquire(): T {
        if (this.pool.length > 0) {
            return this.pool.pop()!;
        }
        
        if (this.currentSize < this.maxSize) {
            this.currentSize++;
            return this.createFunction();
        }
        
        throw new Error('Object pool exhausted');
    }
    
    // 歸還對象
    release(obj: T): void {
        if (this.pool.length < this.maxSize) {
            this.resetFunction(obj);
            this.pool.push(obj);
        } else {
            // 池已滿，直接丟棄對象
            this.currentSize--;
        }
    }
    
    // 統計信息
    getStats(): PoolStats {
        return {
            currentSize: this.currentSize,
            available: this.pool.length,
            inUse: this.currentSize - this.pool.length,
            hitRate: this.calculateHitRate()
        };
    }
}

// 專用字節數組池
class ByteArrayPool {
    private static instance: ByteArrayPool;
    private pools: Map<number, ObjectPool<Uint8Array>> = new Map();
    
    static getInstance(): ByteArrayPool {
        if (!ByteArrayPool.instance) {
            ByteArrayPool.instance = new ByteArrayPool();
        }
        return ByteArrayPool.instance;
    }
    
    // 獲取指定大小的字節數組
    getByteArray(size: number): Uint8Array {
        if (!this.pools.has(size)) {
            this.pools.set(size, new ObjectPool(
                () => new Uint8Array(size),
                (arr) => arr.fill(0) // 重置時清零
            ));
        }
        
        return this.pools.get(size)!.acquire();
    }
    
    // 歸還字節數組
    returnByteArray(arr: Uint8Array): void {
        const size = arr.length;
        if (this.pools.has(size)) {
            this.pools.get(size)!.release(arr);
        }
    }
}

// 垃圾回收器配置接口
interface GCConfiguration {
    enabled: boolean;                    // 是否啓用GC
    strategy: GCStrategy;               // 回收策略
    generationSizes: GenerationSizes;   // 分代大小配置
    thresholds: GCThresholds;           // 觸發閾值
    scheduling: GCScheduling;           // 調度策略
}

// 分代GC實現
class GenerationalGC {
    private youngGeneration: YoungGeneration;
    private oldGeneration: OldGeneration;
    private permanentGeneration: PermanentGeneration;
    
    // 執行垃圾回收
    collect(generation: GenerationType = 'AUTO', reason: GCReason): GCResult {
        const startTime = Date.now();
        let freedMemory = 0;
        
        switch (generation) {
            case 'YOUNG':
                freedMemory = this.collectYoungGeneration(reason);
                break;
            case 'OLD':
                freedMemory = this.collectOldGeneration(reason);
                break;
            case 'FULL':
                freedMemory = this.collectFullGC(reason);
                break;
            case 'AUTO':
                freedMemory = this.collectAuto(reason);
                break;
        }
        
        return {
            duration: Date.now() - startTime,
            freedMemory,
            generation,
            reason
        };
    }
    
    // 年輕代回收（Minor GC）
    private collectYoungGeneration(reason: GCReason): number {
        // 複製算法：From Space -> To Space
        const fromSpace = this.youngGeneration.fromSpace;
        const toSpace = this.youngGeneration.toSpace;
        
        let freed = 0;
        let survived = 0;
        
        for (const obj of fromSpace.liveObjects) {
            if (this.isAlive(obj)) {
                // 存活對象複製到To Space
                this.copyToSpace(obj, toSpace);
                survived += obj.size;
            } else {
                // 死亡對象回收
                freed += obj.size;
                this.freeObject(obj);
            }
        }
        
        // 交換From和To空間
        this.youngGeneration.fromSpace = toSpace;
        this.youngGeneration.toSpace = fromSpace;
        fromSpace.clear();
        
        // 提升長期存活對象到老年代
        this.promoteLongLivedObjects();
        
        return freed;
    }
    
    // 內存分配優化
    optimizedAllocate(size: number, type: AllocationType): object {
        // 根據分配類型選擇最優策略
        if (size <= this.youngGeneration.maxObjectSize) {
            return this.youngGeneration.allocate(size);
        } else {
            // 大對象直接進入老年代
            return this.oldGeneration.allocateLargeObject(size);
        }
    }
}

// 分佈式垃圾回收協調器
class DistributedGCCoordinator {
    private deviceCoordinators: Map<string, GCController> = new Map();
    private referenceGraph: DistributedReferenceGraph;
    
    // 協調跨設備GC
    async coordinateCrossDeviceGC(): Promise<DistributedGCResult> {
        // 1. 暫停所有設備的內存分配
        await this.pauseAllocations();
        
        try {
            // 2. 構建全局引用圖
            const globalRefGraph = await this.buildGlobalReferenceGraph();
            
            // 3. 標記階段：遍歷全局可達性
            const markedObjects = await this.markGlobalReachableObjects(globalRefGraph);
            
            // 4. 清理階段：協調各設備同時清理
            const results = await this.sweepAllDevices(markedObjects);
            
            return this.aggregateResults(results);
        } finally {
            // 5. 恢復內存分配
            await this.resumeAllocations();
        }
    }
    
    // 處理跨設備引用
    private async handleCrossDeviceReferences(): Promise<void> {
        // 檢測跨設備循環引用
        const crossDeviceCycles = this.detectCrossDeviceCycles();
        
        for (const cycle of crossDeviceCycles) {
            // 使用引用計數+週期檢測的混合策略
            if (this.isLeakCycle(cycle)) {
                await this.breakCycle(cycle);
            }
        }
    }
}

// 圖片內存優化管理器
class ImageMemoryOptimizer {
    private cache: LruCache<string, ImageCacheItem>;
    private decoderPool: ImageDecoderPool;
    
    // 加載優化圖片
    async loadOptimizedImage(uri: string, options: ImageLoadOptions): Promise<ImageResult> {
        // 檢查緩存
        const cached = this.cache.get(uri);
        if (cached && !cached.isExpired()) {
            return cached.image;
        }
        
        // 根據設備能力選擇解碼策略
        const decodeStrategy = this.selectDecodeStrategy(options);
        
        // 使用對象池獲取解碼器
        const decoder = this.decoderPool.acquire();
        try {
            const image = await decoder.decode(uri, decodeStrategy);
            
            // 緩存優化
            this.cacheImage(uri, image, options);
            
            return image;
        } finally {
            this.decoderPool.release(decoder);
        }
    }
    
    // 圖片緩存策略
    private cacheImage(uri: string, image: Image, options: ImageLoadOptions): void {
        const cacheItem: ImageCacheItem = {
            image,
            size: this.calculateImageSize(image),
            lastAccess: Date.now(),
            accessCount: 0
        };
        
        // 根據內存壓力調整緩存策略
        if (this.isUnderMemoryPressure()) {
            this.cache.setMaxSize(this.cache.getMaxSize() * 0.8);
        }
        
        this.cache.put(uri, cacheItem);
    }
    
    // 內存壓力處理
    onMemoryPressure(pressure: MemoryPressure): void {
        switch (pressure.level) {
            case 'LOW':
                this.cache.setMaxSize(this.cache.getMaxSize() * 1.2);
                break;
            case 'MEDIUM':
                this.clearExpiredCache();
                break;
            case 'HIGH':
                this.clearHalfCache();
                break;
            case 'CRITICAL':
                this.clearAllCache();
                System.gc();
                break;
        }
    }
}

// 虛擬化列表內存優化
class VirtualizedListOptimizer {
    private recycler: ViewRecycler;
    private viewCache: Map<string, Component[]> = new Map();
    
    // 優化列表渲染
    optimizeListRendering(listData: any[], container: Component): void {
        // 只渲染可見項
        const visibleRange = this.calculateVisibleRange(container);
        const visibleItems = listData.slice(visibleRange.start, visibleRange.end);
        
        // 回收不可見項
        this.recycleInvisibleViews(visibleRange);
        
        // 複用視圖組件
        this.renderVisibleItemsWithReuse(visibleItems, container);
    }
    
    // 視圖複用機制
    private renderVisibleItemsWithReuse(items: any[], container: Component): void {
        for (const item of items) {
            let view = this.recycler.getReusableView(item.type);
            
            if (!view) {
                view = this.createNewView(item.type);
            } else {
                // 複用視圖，只更新數據
                this.updateViewData(view, item);
            }
            
            this.renderView(view, container);
        }
    }
    
    // 內存使用監控
    private monitorMemoryUsage(): void {
        setInterval(() => {
            const memoryInfo = this.getMemoryInfo();
            
            if (memoryInfo.usedRatio > 0.8) {
                // 內存使用率超過80%，主動清理
                this.aggressiveRecycle();
                System.gc();
            }
        }, 5000); // 每5秒檢查一次
    }
}

// 實時內存監控器
class RealTimeMemoryMonitor {
    private metrics: MemoryMetrics[] = [];
    private alertCallbacks: Array<(alert: MemoryAlert) => void> = [];
    
    // 開始監控
    startMonitoring(): void {
        setInterval(() => {
            const metrics = this.collectMemoryMetrics();
            this.metrics.push(metrics);
            
            // 檢測異常模式
            if (this.detectAbnormalPattern(metrics)) {
                this.triggerAlert(metrics);
            }
            
            // 保留最近1000條記錄
            if (this.metrics.length > 1000) {
                this.metrics = this.metrics.slice(-1000);
            }
        }, 1000); // 每秒採集一次
    }
    
    // 生成性能報告
    generateReport(): MemoryReport {
        return {
            period: {
                start: this.metrics[0]?.timestamp,
                end: this.metrics[this.metrics.length - 1]?.timestamp
            },
            averageUsage: this.calculateAverageUsage(),
            peakUsage: this.findPeakUsage(),
            leakCandidates: this.findLeakCandidates(),
            recommendations: this.generateRecommendations()
        };
    }
    
    // 內存泄漏模式識別
    private findLeakCandidates(): LeakCandidate[] {
        const candidates: LeakCandidate[] = [];
        const windowSize = 10;
        
        for (let i = windowSize; i < this.metrics.length; i++) {
            const window = this.metrics.slice(i - windowSize, i);
            const trend = this.calculateMemoryTrend(window);
            
            if (trest.slope > 0 && trend.rSquared > 0.8) {
                // 內存持續增長且相關性較強
                candidates.push({
                    startTime: window[0].timestamp,
                    endTime: window[window.length - 1].timestamp,
                    growth: trend.slope * windowSize,
                    confidence: trend.rSquared
                });
            }
        }
        
        return candidates;
    }
}