export type KnowledgeSourceType =
  | 'user_chat'
  | 'imported_chat'
  | 'imported_ai_chat'
  | 'imported_document'
  | 'doc'
  | 'note'
  | 'spec'
  | 'research'
  | 'other';

export type KnowledgeSourceOrigin =
  | 'chatgpt'
  | 'gemini'
  | 'claude'
  | 'cursor'
  | 'vibn'
  | 'other';

export type KnowledgeImportance = 'primary' | 'supporting' | 'irrelevant';

export interface ChunkMetadata {
  chunkIndex: number;
  totalChunks: number;
  startChar: number;
  endChar: number;
  tokenCount: number;
}

export interface KnowledgeSourceMeta {
  origin?: KnowledgeSourceOrigin;
  url?: string | null;
  filename?: string | null;
  createdAtOriginal?: string | null;
  importance?: KnowledgeImportance;
  tags?: string[];
  chunkMetadata?: ChunkMetadata;
}

export interface KnowledgeItem {
  id: string;
  projectId: string;
  sourceType: KnowledgeSourceType;
  title?: string | null;
  content: string;
  sourceMeta?: KnowledgeSourceMeta;
  createdAt: FirebaseFirestore.Timestamp;
  updatedAt: FirebaseFirestore.Timestamp;
}