/**
 * HTTP fetcher with timeout and error handling.
 * Extracted from real-world MCP server development (webcheck-mcp).
 */

export interface FetchOptions {
  timeoutMs?: number;
  headers?: Record<string, string>;
}

export interface FetchResult {
  status: number;
  headers: Record<string, string>;
  body: string;
  responseTimeMs: number;
}

export async function fetchWithTimeout(
  url: string,
  options: FetchOptions = {}
): Promise<FetchResult> {
  const { timeoutMs = 10000, headers = {} } = options;

  const controller = new AbortController();
  const timer = setTimeout(() => controller.abort(), timeoutMs);
  const start = Date.now();

  try {
    const response = await fetch(url, {
      signal: controller.signal,
      headers: {
        "User-Agent": "MCP-Server/1.0",
        ...headers,
      },
    });

    const body = await response.text();
    const responseTimeMs = Date.now() - start;

    const responseHeaders: Record<string, string> = {};
    response.headers.forEach((value, key) => {
      responseHeaders[key] = value;
    });

    return {
      status: response.status,
      headers: responseHeaders,
      body,
      responseTimeMs,
    };
  } finally {
    clearTimeout(timer);
  }
}