export type EmbeddingProviderKind = "local" | "openai-compatible" | "disabled";

export type EmbeddingStatusValue =
	| "not_started"
	| "downloading"
	| "warming"
	| "ready"
	| "fallback_active"
	| "fts_only"
	| "failed";

export interface EmbeddingService {
	readonly kind: EmbeddingProviderKind;
	readonly provider: "transformers" | "openai-compatible" | "disabled";
	readonly modelId: string;
	readonly dimensions: number;
	readonly status: EmbeddingStatusValue;
	readonly lastError?: string;
	readonly activeDevice?: string;
	readonly downloadStatus?: string;
	readonly downloadFile?: string;
	readonly downloadLoadedBytes?: number;
	readonly downloadTotalBytes?: number;
	readonly downloadProgress?: number;

	ensureReady(): Promise<void>;
	embedTexts(texts: string[]): Promise<number[][]>;
}

export const EMBEDDING_VERSION = "code-intelligence-v2";

export function buildChunkEmbeddingText(input: {
	path: string;
	language?: string;
	symbolName?: string;
	symbolKind?: string;
	chunkKind: string;
	content: string;
	graphContext?: string[];
}): string {
	const lines = [`Path: ${input.path}`];
	if (input.language) lines.push(`Language: ${input.language}`);
	if (input.symbolName) lines.push(`Symbol: ${input.symbolName}`);
	if (input.symbolKind) lines.push(`Kind: ${input.symbolKind}`);
	lines.push(`Chunk kind: ${input.chunkKind}`);
	if (input.graphContext && input.graphContext.length > 0)
		lines.push("", "Graph context:", ...input.graphContext);
	lines.push("", "Code:", input.content);
	return lines.join("\n");
}