/**
 * providers/index.js — provider registry
 *
 * Reads ~/.pi/agent/models.json and returns typed provider config for all
 * providers we know how to probe. Non-anthropic-messages providers (e.g. zai)
 * are silently skipped.
 */

import { readFileSync } from 'fs';
import { homedir } from 'os';

/**
 * Classify a provider by name and config.
 * @returns {'teams-direct'|'shelley-proxy'|'api-direct'|null}
 */
function classifyProvider(name, config) {
  if (name === 'shelley-proxy') return 'shelley-proxy';
  if (name === 'api-ateam') return 'api-direct';
  if (config.api === 'anthropic-messages' && name.startsWith('team-')) return 'teams-direct';
  return null; // skip (zai, etc.)
}

/**
 * Load and classify all providers from models.json.
 * @returns {Object} map of provider name → { name, type, baseUrl, apiKey }
 */
export function getProviders() {
  const modelsJson = JSON.parse(
    readFileSync(`${homedir()}/.pi/agent/models.json`, 'utf-8')
  );

  const providers = {};
  for (const [name, config] of Object.entries(modelsJson.providers)) {
    const type = classifyProvider(name, config);
    if (!type) continue;
    providers[name] = {
      name,
      type,
      baseUrl: config.baseUrl,
      apiKey: config.apiKey || null,
    };
  }
  return providers;
}

// Alias for backwards compatibility
export const loadProviders = getProviders;