/**
 * Graph Database Service
 * Handles persistence and database operations for the knowledge graph
 */
import { KnowledgeNode, KnowledgeTriad, GraphQuery, GraphMutation, RelationType } from '../types';
export interface IGraphDatabaseService {
    initializeDatabase(): Promise<void>;
    createTables(): Promise<void>;
    saveNode(node: KnowledgeNode): Promise<void>;
    saveTriad(triad: KnowledgeTriad): Promise<void>;
    loadNodes(): Promise<Map<string, KnowledgeNode>>;
    loadTriads(): Promise<Map<string, KnowledgeTriad>>;
    queryNodes(query: GraphQuery): Promise<KnowledgeNode[]>;
    queryTriads(query: GraphQuery): Promise<KnowledgeTriad[]>;
    mutateGraph(mutation: GraphMutation): Promise<void>;
    closeConnection(): Promise<void>;
}
export declare class GraphDatabaseService implements IGraphDatabaseService {
    private projectPath;
    private logger;
    private db;
    private initialized;
    private static databaseUnavailable;
    private static errorNotified;
    constructor(projectPath: string);
    /**
     * Check if database is marked as unavailable
     */
    static isDatabaseUnavailable(): boolean;
    /**
     * Reset the database unavailable flag (for retry attempts)
     */
    static resetAvailability(): void;
    initializeDatabase(): Promise<void>;
    /**
     * Create database tables - should only be called during setup phase
     */
    createTables(): Promise<void>;
    saveNode(node: KnowledgeNode): Promise<void>;
    saveTriad(triad: KnowledgeTriad): Promise<void>;
    loadNodes(): Promise<Map<string, KnowledgeNode>>;
    loadTriads(): Promise<Map<string, KnowledgeTriad>>;
    queryNodes(query: GraphQuery): Promise<KnowledgeNode[]>;
    queryTriads(query: GraphQuery): Promise<KnowledgeTriad[]>;
    mutateGraph(mutation: GraphMutation): Promise<void>;
    closeConnection(): Promise<void>;
    private generateNodeId;
    private generateTriadId;
    getNodesByType(nodeType: string, limit?: number): Promise<KnowledgeNode[]>;
    getTriadsByPredicate(predicate: RelationType, limit?: number): Promise<KnowledgeTriad[]>;
    getNodeConnections(nodeId: string): Promise<{
        incoming: KnowledgeTriad[];
        outgoing: KnowledgeTriad[];
    }>;
    getNodeNeighbors(nodeId: string): Promise<string[]>;
    getSubgraph(nodeIds: string[]): Promise<{
        nodes: KnowledgeNode[];
        triads: KnowledgeTriad[];
    }>;
}
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