export type SyncStatus = 'idle' | 'syncing' | 'error' | 'conflict' | 'offline';
export interface SyncOperation<T = any> {
    id: string;
    table: string;
    operation: 'insert' | 'update' | 'delete';
    data: T;
    timestamp: number;
    clientId: string;
    version: number;
    status: 'pending' | 'synced' | 'error';
    error?: string;
    userId?: string;
}
export interface SyncResult {
    success: boolean;
    synced: string[];
    conflicts: Conflict[];
    errors: Array<{
        id: string;
        error: string;
    }>;
}
export interface Conflict<T = any> {
    operation: SyncOperation<T>;
    serverData: T;
    clientData: T;
    resolution?: 'client-wins' | 'server-wins' | 'merged';
}
export interface SyncConfig<TLocalDB = any, TRemoteDB = any> {
    local: {
        db: TLocalDB;
        adapter: LocalAdapter<TLocalDB>;
    };
    remote: {
        push: (ops: SyncOperation[]) => Promise<SyncResult>;
        pull: (lastSync: number, clientId: string) => Promise<SyncOperation[]>;
        resolve?: (conflict: Conflict) => Promise<SyncOperation>;
    };
    syncInterval?: number;
    batchSize?: number;
    conflictResolution?: 'client-wins' | 'server-wins' | 'manual' | 'last-write-wins';
    retryAttempts?: number;
    retryDelay?: number;
    realtime?: RealtimeClientConfig;
    onSync?: (status: SyncStatus) => void;
    onConflict?: (conflict: Conflict) => void;
    onError?: (error: Error) => void;
}
export interface ClientState {
    clientId: string;
    userId: string;
    lastSync: Date;
    lastActive: Date;
}
export interface ServerAdapter<TDB = any> {
    insert(table: string, data: any): Promise<any>;
    update(table: string, id: string, data: any, version: number): Promise<any>;
    delete(table: string, id: string): Promise<void>;
    findOne(table: string, id: string): Promise<any | null>;
    find(table: string, filter?: QueryFilter): Promise<any[]>;
    getChangesSince(table: string, timestamp: number, userId?: string, excludeClientId?: string): Promise<SyncOperation[]>;
    applyOperation(op: SyncOperation, userId?: string): Promise<void>;
    batchInsert(table: string, records: any[]): Promise<any[]>;
    batchUpdate(table: string, updates: Array<{
        id: string;
        data: any;
    }>): Promise<any[]>;
    checkConflict(table: string, id: string, expectedVersion: number): Promise<boolean>;
    logSyncOperation(op: SyncOperation, userId: string): Promise<void>;
    updateClientState(clientId: string, userId: string): Promise<void>;
    getClientState(clientId: string): Promise<ClientState | null>;
    subscribe?(tables: string[], userId: string, callback: (ops: SyncOperation[]) => void): Promise<() => void>;
    transaction?<T>(fn: (adapter: ServerAdapter<TDB>) => Promise<T>): Promise<T>;
}
export interface QueryFilter {
    where?: Record<string, any>;
    orderBy?: {
        field: string;
        direction: 'asc' | 'desc';
    }[];
    limit?: number;
    offset?: number;
}
export interface ClientAdapter<TDB = any> {
    insert(table: string, data: any): Promise<any>;
    update(table: string, id: string, data: any): Promise<any>;
    delete(table: string, id: string): Promise<void>;
    find(table: string, query?: any): Promise<any[]>;
    findOne(table: string, id: string): Promise<any | null>;
    addToQueue(op: SyncOperation): Promise<void>;
    getQueue(): Promise<SyncOperation[]>;
    removeFromQueue(ids: string[]): Promise<void>;
    updateQueueStatus(id: string, status: SyncOperation['status'], error?: string): Promise<void>;
    getLastSync(): Promise<number>;
    setLastSync(timestamp: number): Promise<void>;
    getClientId(): Promise<string>;
    batchInsert?(table: string, records: any[]): Promise<any[]>;
    batchDelete?(table: string, ids: string[]): Promise<void>;
    clear?(): Promise<void>;
}
export interface LocalAdapter<TDB = any> extends ClientAdapter<TDB> {
    isInitialized(): Promise<boolean>;
    setInitialized(value: boolean): Promise<void>;
}
export type RealtimeStatus = 'connected' | 'connecting' | 'disconnected' | 'fallback';
export interface RealtimeClientConfig {
    /** Enable realtime sync (default: true) */
    enabled?: boolean;
    /** SSE endpoint URL (default: '/api/sync/realtime') */
    endpoint?: string;
    /** Tables to subscribe to (default: [] = all tables) */
    tables?: string[];
    /** Reconnect interval in ms (default: 1000) */
    reconnectInterval?: number;
    /** Maximum reconnect interval in ms (default: 30000) */
    maxReconnectInterval?: number;
    /** Max reconnect attempts before fallback to polling (default: 5) */
    maxReconnectAttempts?: number;
    /** Heartbeat timeout in ms (default: 45000) */
    heartbeatTimeout?: number;
}