/**
 * HTTP client for the Performance West API.
 * All MCP tools delegate to the API — this keeps the MCP server
 * stateless and avoids duplicating business logic.
 */

const DEFAULT_BASE_URL = "https://api.performancewest.net";

const baseUrl = process.env.PW_API_URL ?? DEFAULT_BASE_URL;
const apiKey = process.env.PW_API_KEY ?? "";

function buildUrl(
  path: string,
  params?: Record<string, string | number | undefined>,
): string {
  const url = new URL(path, baseUrl);
  if (params) {
    for (const [k, v] of Object.entries(params)) {
      if (v !== undefined && v !== "") {
        url.searchParams.set(k, String(v));
      }
    }
  }
  return url.toString();
}

export interface ApiResponse<T = unknown> {
  ok: boolean;
  status: number;
  data: T;
}

export async function apiGet<T = unknown>(
  path: string,
  params?: Record<string, string | number | undefined>,
): Promise<ApiResponse<T>> {
  const url = buildUrl(path, params);
  const headers: Record<string, string> = {
    Accept: "application/json",
    "User-Agent": "performancewest-mcp-server/0.1.0",
  };
  if (apiKey) {
    headers["Authorization"] = `Bearer ${apiKey}`;
  }

  const res = await fetch(url, { headers });
  const data = (await res.json()) as T;
  return { ok: res.ok, status: res.status, data };
}

export async function apiPost<T = unknown>(
  path: string,
  body: Record<string, unknown>,
): Promise<ApiResponse<T>> {
  const url = buildUrl(path);
  const headers: Record<string, string> = {
    Accept: "application/json",
    "Content-Type": "application/json",
    "User-Agent": "performancewest-mcp-server/0.1.0",
  };
  if (apiKey) {
    headers["Authorization"] = `Bearer ${apiKey}`;
  }

  const res = await fetch(url, {
    method: "POST",
    headers,
    body: JSON.stringify(body),
  });
  const data = (await res.json()) as T;
  return { ok: res.ok, status: res.status, data };
}