import { existsSync, readFileSync } from "node:fs";
import type { McpServerEntry } from "../types.ts";

function loadJson(path: string): Record<string, unknown> {
  if (!existsSync(path)) return {};
  try {
    return JSON.parse(readFileSync(path, "utf-8")) as Record<string, unknown>;
  } catch {
    return {};
  }
}

export function readMcpServersFromConfig(path: string): McpServerEntry[] {
  const config = loadJson(path);
  const servers = config.mcpServers;
  if (!servers || typeof servers !== "object") return [];

  const entries: McpServerEntry[] = [];
  for (const [name, value] of Object.entries(servers as Record<string, unknown>)) {
    if (!value || typeof value !== "object") continue;

    const server = value as Record<string, unknown>;
    const command = typeof server.command === "string" ? server.command : undefined;
    const url = typeof server.url === "string" ? server.url : undefined;
    const lifecycle = typeof server.lifecycle === "string" ? server.lifecycle : undefined;
    const mode = url ? "http" : "stdio";
    entries.push({ name, mode, lifecycle, command, url });
  }

  return entries;
}