/**
 * Thread Suggestions Service (Phase 5: Implicit Thread Detection)
 *
 * Detects recurring session topics not captured by existing threads.
 * Core detection is pure (no I/O). File persistence and Supabase
 * queries are separate functions called by the session lifecycle.
 *
 * Algorithm:
 *   1. Compare current session embedding against recent sessions
 *   2. If 3+ sessions are similar AND no matching open thread exists
 *      → create a thread suggestion
 *   3. Suggestions surfaced at session_start, managed via promote/dismiss
 */
import type { ThreadWithEmbedding } from "./thread-dedup.js";
import type { ThreadSuggestion, Project } from "../types/index.js";
export declare const SESSION_SIMILARITY_THRESHOLD = 0.7;
export declare const THREAD_MATCH_THRESHOLD = 0.8;
export declare const SUGGESTION_MATCH_THRESHOLD = 0.8;
export declare const MIN_EVIDENCE_SESSIONS = 3;
export interface SessionEmbeddingRecord {
    session_id: string;
    session_title: string;
    embedding: number[];
}
/**
 * Detect suggested threads from session embedding clustering.
 * Pure function — no I/O, no side effects.
 *
 * Returns the full updated suggestions list (existing + any new/updated).
 */
export declare function detectSuggestedThreads(currentSession: {
    session_id: string;
    title: string;
    embedding: number[];
}, recentSessions: SessionEmbeddingRecord[], openThreadEmbeddings: ThreadWithEmbedding[], existingSuggestions: ThreadSuggestion[]): ThreadSuggestion[];
/**
 * Promote a suggestion to an open thread.
 * Mutates the suggestion in-place and returns it, or null if not found.
 */
export declare function promoteSuggestionById(id: string, threadId: string, suggestions: ThreadSuggestion[]): ThreadSuggestion | null;
/**
 * Dismiss a suggestion. Increments dismissed_count.
 * Mutates the suggestion in-place and returns it, or null if not found.
 */
export declare function dismissSuggestionById(id: string, suggestions: ThreadSuggestion[]): ThreadSuggestion | null;
/**
 * Filter to only pending suggestions (not promoted/dismissed).
 * Excludes suggestions dismissed 3+ times (permanently suppressed).
 */
export declare function getPendingSuggestions(suggestions: ThreadSuggestion[]): ThreadSuggestion[];
/**
 * Load suggestions from .gitmem/suggested-threads.json.
 * Returns empty array if file doesn't exist or is corrupted.
 */
export declare function loadSuggestions(): ThreadSuggestion[];
/**
 * Save suggestions to .gitmem/suggested-threads.json.
 */
export declare function saveSuggestions(suggestions: ThreadSuggestion[]): void;
/**
 * Fetch recent session embeddings from Supabase for clustering comparison.
 * Returns null if Supabase is unavailable.
 */
export declare function loadRecentSessionEmbeddings(project?: Project, days?: number, limit?: number): Promise<SessionEmbeddingRecord[] | null>;
export declare function generateSuggestionId(): string;
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