// Configuration persistence — ~/.pi/pi-search-kit/config.json
//
// Env vars take precedence over config file values:
//   TAVILY_API_KEY, ANYSEARCH_API_KEY, JINA_API_KEY, EXA_API_KEY, SERPER_API_KEY,
//   FIRECRAWL_API_KEY, DEEPSEEK_API_KEY, GEMINI_API_KEY, IFLOW_API_KEY

import { existsSync, readFileSync } from "node:fs";
import { homedir } from "node:os";
import { join } from "node:path";

const CONFIG_DIR = join(homedir(), ".pi", "pi-search-kit");
const CONFIG_PATH = join(CONFIG_DIR, "config.json");

export interface SearchConfig {
	apiKeys?: Record<string, string>;
	defaults?: {
		max_results?: number;
	};
}

const DEFAULT_CONFIG: SearchConfig = {};

export function loadConfig(configPath = CONFIG_PATH): SearchConfig {
	if (!existsSync(configPath)) return { ...DEFAULT_CONFIG };
	try {
		const raw = readFileSync(configPath, "utf-8");
		return { ...DEFAULT_CONFIG, ...(JSON.parse(raw) as SearchConfig) };
	} catch (err) {
		console.error("Failed to parse config.json:", err instanceof Error ? err.message : err);
		return { ...DEFAULT_CONFIG };
	}
}

export function resolveApiKey(name: string, envVar: string, config: SearchConfig): string | undefined {
	// env var wins
	const envKey = process.env[envVar]?.trim();
	if (envKey) return envKey;

	// config file
	return config.apiKeys?.[name]?.trim() || undefined;
}