// 操作定義
interface DataOperation {
    id: string;           // 操作唯一標識
    type: 'INSERT' | 'UPDATE' | 'DELETE'; // 操作類型
    path: string;         // 數據路徑
    value: any;           // 操作值
    timestamp: number;     // 邏輯時間戳
    deviceId: string;     // 產生操作的設備ID
    parentOpId?: string;  // 父操作ID（用於維護操作順序）
}

// 操作轉換器
class OperationTransformer {
    private history: Map<string, DataOperation> = new Map();
    
    // 轉換操作以解決衝突
    transform(localOp: DataOperation, remoteOp: DataOperation): DataOperation {
        // 如果操作路徑不同，無需轉換
        if (localOp.path !== remoteOp.path) {
            return localOp;
        }
        
        // 相同路徑的操作轉換
        switch (`${localOp.type}-${remoteOp.type}`) {
            case 'INSERT-INSERT':
                return this.handleInsertInsert(localOp, remoteOp);
            case 'UPDATE-UPDATE':
                return this.handleUpdateUpdate(localOp, remoteOp);
            case 'UPDATE-DELETE':
                return this.handleUpdateDelete(localOp, remoteOp);
            default:
                return this.handleDefaultCase(localOp, remoteOp);
        }
    }
    
    // 處理INSERT-INSERT衝突
    private handleInsertInsert(localOp: DataOperation, remoteOp: DataOperation): DataOperation {
        // 基於設備ID和邏輯時間戳解決衝突
        if (this.shouldLocalWin(localOp, remoteOp)) {
            return { ...localOp, value: this.mergeValues(localOp.value, remoteOp.value) };
        } else {
            // 遠程操作獲勝，本地操作需要調整路徑
            return { 
                ...localOp, 
                path: this.generateAlternativePath(localOp.path) 
            };
        }
    }
    
    // 判斷本地操作是否優先
    private shouldLocalWin(localOp: DataOperation, remoteOp: DataOperation): boolean {
        // 基於邏輯時間戳、設備優先級等多因素決策
        if (localOp.timestamp !== remoteOp.timestamp) {
            return localOp.timestamp > remoteOp.timestamp;
        }
        return localOp.deviceId > remoteOp.deviceId; // 設備ID作為決勝條件
    }
}

// 版本向量實現
class VersionVector {
    private entries: Map<string, number> = new Map(); // deviceId -> counter
    
    // 遞增版本號
    increment(deviceId: string): void {
        const current = this.entries.get(deviceId) || 0;
        this.entries.set(deviceId, current + 1);
    }
    
    // 比較版本先後關係
    compare(other: VersionVector): VersionComparison {
        let allLessOrEqual = true;
        let allGreaterOrEqual = true;
        
        for (const [deviceId, counter] of this.entries) {
            const otherCounter = other.entries.get(deviceId) || 0;
            
            if (counter > otherCounter) {
                allLessOrEqual = false;
            }
            if (counter < otherCounter) {
                allGreaterOrEqual = false;
            }
        }
        
        if (allLessOrEqual && !allGreaterOrEqual) {
            return VersionComparison.BEFORE;
        } else if (allGreaterOrEqual && !allLessOrEqual) {
            return VersionComparison.AFTER;
        } else if (!allLessOrEqual && !allGreaterOrEqual) {
            return VersionComparison.CONCURRENT;
        } else {
            return VersionComparison.EQUAL;
        }
    }
    
    // 合併版本向量
    merge(other: VersionVector): VersionVector {
        const merged = new VersionVector();
        
        for (const [deviceId, counter] of this.entries) {
            const otherCounter = other.entries.get(deviceId) || 0;
            merged.entries.set(deviceId, Math.max(counter, otherCounter));
        }
        
        for (const [deviceId, counter] of other.entries) {
            if (!this.entries.has(deviceId)) {
                merged.entries.set(deviceId, counter);
            }
        }
        
        return merged;
    }
}

// 衝突檢測器
class ConflictDetector {
    private detectors: ConflictDetectorStrategy[] = [];
    
    constructor() {
        this.detectors.push(new SyntaxConflictDetector());
        this.detectors.push(new SemanticConflictDetector());
        this.detectors.push(new BusinessLogicConflictDetector());
    }
    
    // 檢測衝突
    async detectConflicts(localOps: DataOperation[], remoteOps: DataOperation[]): Promise<Conflict[]> {
        const conflicts: Conflict[] = [];
        
        for (const detector of this.detectors) {
            const detected = await detector.detect(localOps, remoteOps);
            conflicts.push(...detected);
        }
        
        return this.prioritizeConflicts(conflicts);
    }
    
    // 衝突優先級排序
    private prioritizeConflicts(conflicts: Conflict[]): Conflict[] {
        return conflicts.sort((a, b) => {
            // 數據完整性衝突優先於業務邏輯衝突
            if (a.type !== b.type) {
                return this.getConflictPriority(a.type) - this.getConflictPriority(b.type);
            }
            // 影響範圍大的衝突優先
            return b.impactScope - a.impactScope;
        });
    }
}

// 語義衝突檢測器
class SemanticConflictDetector {
    async detect(localOps: DataOperation[], remoteOps: DataOperation[]): Promise<Conflict[]> {
        const conflicts: Conflict[] = [];
        
        // 檢查數據完整性約束衝突
        for (const localOp of localOps) {
            for (const remoteOp of remoteOps) {
                if (this.violatesForeignKeyConstraint(localOp, remoteOp)) {
                    conflicts.push({
                        type: ConflictType.REFERENTIAL_INTEGRITY,
                        operations: [localOp, remoteOp],
                        impactScope: ImpactScope.HIGH,
                        detectedAt: Date.now()
                    });
                }
            }
        }
        
        return conflicts;
    }
}

// 衝突解決策略工廠
class ConflictResolverFactory {
    static createResolver(conflict: Conflict, context: ResolutionContext): ConflictResolver {
        switch (conflict.type) {
            case ConflictType.LAST_WRITER_WINS:
                return new LastWriterWinsResolver(context);
            case ConflictType.AUTOMERGE:
                return new AutoMergeResolver(context);
            case ConflictType.CUSTOM_BUSINESS:
                return new BusinessLogicResolver(context);
            case ConflictType.USER_INTERVENTION:
                return new UserInterventionResolver(context);
            default:
                return new ConservativeResolver(context);
        }
    }
}

// 自動合併解決器
class AutoMergeResolver implements ConflictResolver {
    async resolve(conflict: Conflict): Promise<ResolutionResult> {
        const mergedValue = this.mergeValues(
            conflict.operations[0].value,
            conflict.operations[1].value
        );
        
        // 創建合併後的新操作
        const resolvedOp: DataOperation = {
            ...conflict.operations[0],
            value: mergedValue,
            resolvedAt: Date.now(),
            resolutionStrategy: 'AUTOMERGE'
        };
        
        return {
            success: true,
            resolvedOperation: resolvedOp,
            resolvedAt: Date.now(),
            confidence: this.calculateMergeConfidence(conflict.operations)
        };
    }
    
    // 智能值合併算法
    private mergeValues(localValue: any, remoteValue: any): any {
        if (typeof localValue !== typeof remoteValue) {
            // 類型不同，採用最後寫入獲勝
            return this.shouldLocalWin() ? localValue : remoteValue;
        }
        
        if (Array.isArray(localValue) && Array.isArray(remoteValue)) {
            // 數組合並，基於唯一標識去重
            return this.mergeArrays(localValue, remoteValue);
        }
        
        if (typeof localValue === 'object' && localValue !== null) {
            // 對象深度合併
            return this.mergeObjects(localValue, remoteValue);
        }
        
        // 基礎類型，採用最後寫入獲勝
        return this.shouldLocalWin() ? localValue : remoteValue;
    }
}

// 反熵協調器
class AntiEntropyCoordinator {
    private merkleTrees: Map<string, MerkleTree> = new Map(); // databaseId -> merkleTree
    
    // 生成Merkle樹用於快速差異檢測
    async buildMerkleTree(databaseId: string): Promise<void> {
        const dataHashes = await this.calculateDataHashes(databaseId);
        this.merkleTrees.set(databaseId, new MerkleTree(dataHashes));
    }
    
    // 與遠程設備比較Merkle樹，識別差異
    async syncWithDevice(deviceId: string, databaseId: string): Promise<SyncPlan> {
        const localTree = this.merkleTrees.get(databaseId);
        const remoteTree = await this.fetchRemoteMerkleTree(deviceId, databaseId);
        
        // 比較Merkle樹根哈希
        if (localTree.rootHash === remoteTree.rootHash) {
            return { needsSync: false }; // 數據一致，無需同步
        }
        
        // 通過Merkle樹快速定位差異範圍
        const differences = await this.findDifferences(localTree, remoteTree);
        
        return {
            needsSync: true,
            differences,
            syncDirection: this.determineSyncDirection(localTree, remoteTree)
        };
    }
    
    // 執行數據同步
    async performSync(syncPlan: SyncPlan): Promise<SyncResult> {
        const batchSize = this.calculateOptimalBatchSize(syncPlan.differences.length);
        let successfulOps = 0;
        let failedOps = 0;
        
        for (let i = 0; i < syncPlan.differences.length; i += batchSize) {
            const batch = syncPlan.differences.slice(i, i + batchSize);
            
            try {
                await this.syncBatch(batch, syncPlan.syncDirection);
                successfulOps += batch.length;
            } catch (error) {
                failedOps += batch.length;
                console.error(`批次同步失敗: ${error.message}`);
                
                // 指數退避重試
                await this.retryWithBackoff(batch, error);
            }
        }
        
        return { successfulOps, failedOps, totalOps: syncPlan.differences.length };
    }
}

// 一致性級別管理器
class ConsistencyLevelManager {
    // 根據操作類型和業務需求確定一致性級別
    determineConsistencyLevel(operation: DataOperation, context: OperationContext): ConsistencyLevel {
        // 強一致性場景：金融交易、關鍵配置變更
        if (this.isCriticalOperation(operation)) {
            return ConsistencyLevel.STRONG;
        }
        
        // 會話一致性：用户界面操作，保證用户感知的一致性
        if (this.isUserFacingOperation(operation)) {
            return ConsistencyLevel.SESSION;
        }
        
        // 最終一致性：後台同步、日誌記錄等
        return ConsistencyLevel.EVENTUAL;
    }
    
    // 強一致性實現：分佈式事務
    async executeWithStrongConsistency(operation: DataOperation): Promise<TransactionResult> {
        // 開始分佈式事務
        const transaction = await this.beginDistributedTransaction();
        
        try {
            // 階段一：準備階段
            const prepareResults = await this.preparePhase(transaction, operation);
            
            if (!this.allParticipantsPrepared(prepareResults)) {
                await this.rollback(transaction);
                return { success: false, reason: 'Prepare phase failed' };
            }
            
            // 階段二：提交階段
            const commitResults = await this.commitPhase(transaction);
            
            if (this.allParticipantsCommitted(commitResults)) {
                return { success: true, transactionId: transaction.id };
            } else {
                // 部分提交失敗，需要恢復
                await this.handlePartialCommit(transaction, commitResults);
                return { success: false, reason: 'Commit phase failed' };
            }
        } catch (error) {
            await this.rollback(transaction);
            throw error;
        }
    }
}

// 同步優化器
class SyncOptimizer {
    private strategies: Map<SyncScenario, SyncStrategy> = new Map();
    
    constructor() {
        this.setupStrategies();
    }
    
    // 根據同步場景選擇合適的策略
    optimizeSync(syncPlan: SyncPlan, context: SyncContext): OptimizedSyncPlan {
        const strategy = this.selectStrategy(syncPlan, context);
        
        return {
            ...syncPlan,
            batchSize: strategy.calculateBatchSize(syncPlan),
            compression: strategy.shouldCompress(syncPlan),
            differentialSync: strategy.supportsDifferentialSync(syncPlan),
            priority: strategy.calculatePriority(syncPlan, context)
        };
    }
    
    // 差分同步：只同步變化部分
    async performDifferentialSync(localData: any, remoteData: any): Promise<SyncOperations> {
        const diff = await this.calculateDifference(localData, remoteData);
        
        return diff.changes.map(change => ({
            type: change.type,
            path: change.path,
            value: change.value,
            oldValue: change.oldValue
        }));
    }
    
    // 智能壓縮策略
    async compressSyncData(data: any): Promise<CompressedData> {
        const compressionAlgorithm = this.selectCompressionAlgorithm(data);
        
        return {
            originalSize: JSON.stringify(data).length,
            compressedData: await compressionAlgorithm.compress(data),
            algorithm: compressionAlgorithm.name,
            ratio: this.calculateCompressionRatio(data)
        };
    }
}

// 分佈式筆記管理器
class DistributedNotesManager {
    private database: DistributedDatabase;
    private syncQueue: AsyncQueue<SyncJob>;
    private conflictResolver: ConflictResolver;
    
    // 初始化分佈式筆記同步
    async initialize(): Promise<void> {
        // 創建分佈式數據庫
        this.database = await DistributedDatabase.create({
            name: 'notes_db',
            distributed: true,
            conflictResolver: new NotesConflictResolver()
        });
        
        // 設置同步隊列
        this.syncQueue = new AsyncQueue({
            concurrency: 3, // 最大併發同步數
            retryAttempts: 3,
            retryDelay: 1000
        });
        
        // 監聽網絡狀態變化
        networkManager.on('connectivityChange', (state) => {
            this.onConnectivityChange(state);
        });
    }
    
    // 創建新筆記（自動同步）
    async createNote(title: string, content: string): Promise<Note> {
        const note: Note = {
            id: this.generateNoteId(),
            title,
            content,
            createdAt: Date.now(),
            updatedAt: Date.now(),
            version: 1,
            deviceId: this.getCurrentDeviceId()
        };
        
        // 本地保存
        await this.database.put('notes', note);
        
        // 異步同步到其他設備
        this.syncQueue.push(() => this.syncNoteToDevices(note));
        
        return note;
    }
    
    // 筆記衝突解決策略
    private async handleNoteConflict(conflict: NoteConflict): Promise<ResolutionResult> {
        // 自動合併策略：合併標題和內容
        if (conflict.type === 'CONTENT_EDIT') {
            const mergedContent = await this.mergeNoteContent(
                conflict.localNote.content,
                conflict.remoteNote.content
            );
            
            const resolvedNote = {
                ...conflict.localNote,
                content: mergedContent,
                updatedAt: Date.now(),
                version: Math.max(conflict.localNote.version, conflict.remoteNote.version) + 1
            };
            
            return { resolved: true, resolvedNote };
        }
        
        // 無法自動解決，需要用户干預
        return await this.requestUserResolution(conflict);
    }
    
    // 智能筆記內容合併
    private async mergeNoteContent(localContent: string, remoteContent: string): Promise<string> {
        // 使用操作轉換算法進行段落級合併
        const localParagraphs = localContent.split('\n\n');
        const remoteParagraphs = remoteContent.split('\n\n');
        
        const mergedParagraphs = await this.mergeParagraphs(localParagraphs, remoteParagraphs);
        
        return mergedParagraphs.join('\n\n');
    }
}

// 同步監控器
class SyncMonitor {
    private metrics: SyncMetrics;
    private alertManager: AlertManager;
    
    // 記錄同步指標
    recordSyncMetrics(metrics: SyncMetrics): void {
        this.metrics = { ...this.metrics, ...metrics };
        
        // 檢查異常情況
        if (this.detectAnomalies(metrics)) {
            this.alertManager.triggerAlert('SYNC_ANOMALY', metrics);
        }
        
        // 報告到監控系統
        this.reportToMonitoringSystem(metrics);
    }
    
    // 檢測同步異常
    private detectAnomalies(metrics: SyncMetrics): boolean {
        // 高衝突率檢測
        if (metrics.conflictRate > 0.1) { // 衝突率超過10%
            return true;
        }
        
        // 同步延遲檢測
        if (metrics.avgSyncLatency > 30000) { // 平均同步延遲超過30秒
            return true;
        }
        
        // 同步失敗率檢測
        if (metrics.failureRate > 0.05) { // 失敗率超過5%
            return true;
        }
        
        return false;
    }
    
    // 生成同步健康報告
    generateHealthReport(): SyncHealthReport {
        return {
            timestamp: Date.now(),
            overallHealth: this.calculateOverallHealth(),
            metrics: this.metrics,
            recommendations: this.generateRecommendations(),
            predictedIssues: this.predictFutureIssues()
        };
    }
}

// 數據修復管理器
class DataRepairManager {
    private repairStrategies: RepairStrategy[] = [];
    
    // 檢測並修復數據不一致
    async detectAndRepairInconsistencies(): Promise<RepairReport> {
        const inconsistencies = await this.detectInconsistencies();
        const repairResults: RepairResult[] = [];
        
        for (const inconsistency of inconsistencies) {
            try {
                const strategy = this.selectRepairStrategy(inconsistency);
                const result = await strategy.repair(inconsistency);
                repairResults.push(result);
            } catch (error) {
                console.error(`修復失敗: ${inconsistency.type}`, error);
                repairResults.push({
                    inconsistency,
                    success: false,
                    error: error.message
                });
            }
        }
        
        return {
            timestamp: Date.now(),
            scannedCount: inconsistencies.length,
            repairedCount: repairResults.filter(r => r.success).length,
            results: repairResults
        };
    }
    
    // 選擇修復策略
    private selectRepairStrategy(inconsistency: Inconsistency): RepairStrategy {
        switch (inconsistency.severity) {
            case Severity.CRITICAL:
                return new AggressiveRepairStrategy();
            case Severity.HIGH:
                return new ConservativeRepairStrategy();
            case Severity.MEDIUM:
                return new LazyRepairStrategy();
            default:
                return new NoOpRepairStrategy();
        }
    }
}