/**
 * ─────────────────────────────────────────────
 *  SPB Git — Personal Git Platform
 * ─────────────────────────────────────────────
 *  Author  : Simon-Pierre Boucher
 *  Contact : contact@spboucher.ai
 *  File    : cli/lib/api.mjs
 *  Purpose : SPB Git API client (native fetch, friendly errors)
 *  License : MIT © Simon-Pierre Boucher
 * ─────────────────────────────────────────────
 */

import pc from 'picocolors';

/** Exit codes per CLAUDE.md §6.3. */
export const EXIT = Object.freeze({ OK: 0, USER: 1, NETWORK: 2, PARTIAL: 3 });

/**
 * Perform an API request against the configured server.
 * @param {object} config CLI config
 * @param {string} method
 * @param {string} path e.g. `/api/v1/repos`
 * @param {object} [body]
 * @param {{auth?: boolean}} [opts]
 * @returns {Promise<any>} parsed JSON
 */
export async function api(config, method, path, body, opts = {}) {
  const headers = { Accept: 'application/json' };
  if (opts.auth !== false && config.token) headers.Authorization = `Bearer ${config.token}`;
  if (body !== undefined) headers['Content-Type'] = 'application/json';
  let response;
  try {
    response = await fetch(`${config.server.replace(/\/+$/, '')}${path}`, {
      method,
      headers,
      body: body === undefined ? undefined : JSON.stringify(body),
    });
  } catch (err) {
    console.error(pc.red(`✗ Cannot reach ${config.server} — ${err.cause?.code ?? err.message}`));
    console.error('  Check the server URL in ~/.spbgit/config.json or run: spbgit doctor');
    process.exit(EXIT.NETWORK);
  }
  const text = await response.text();
  let json = null;
  try {
    json = text ? JSON.parse(text) : null;
  } catch {
    /* non-JSON error body */
  }
  if (!response.ok) {
    if (response.status === 401) {
      console.error(pc.red('✗ Token invalid or revoked.'));
      console.error('  Run `spbgit token new` on a machine with a valid token, then `spbgit init`.');
      process.exit(EXIT.NETWORK);
    }
    const message = json?.error?.message ?? `HTTP ${response.status}`;
    const error = new Error(message);
    error.status = response.status;
    error.code = json?.error?.code;
    throw error;
  }
  return json;
}