/**
 * Profile Manager
 * Handles multiple WMS profiles (AD, LIMAGRAIN, ...) defined in .env.
 *
 * Shared settings (same for all profiles):
 *   - WMS_API_AUTH         OAuth client Basic auth header
 *   - WMS_APPLICATION      Application name (e.g. "EasyWMS")
 *   - WMS_API_PATH         URL path to the ApplicationService API
 *   - WMS_TOKEN_PATH       URL path to the OAuth token endpoint
 *   - WORKFLOW_API_PATH    URL path to the AD API
 *
 * Per-profile settings (prefixed by profile name):
 *   - <PROFILE>_HOST       Hostname or IP (e.g. "10.255.255.2", "p4swms.mss.mecalux.com")
 *   - <PROFILE>_USERNAME
 *   - <PROFILE>_PASSWORD
 *   - <PROFILE>_TENANT
 *   - <PROFILE>_SAAS       "true" | "false" (default false). When true the WMS is
 *                          cloud-hosted — local filesystem logs are not reachable,
 *                          so log tools return an error instead of probing paths.
 *
 * Profile registry:
 *   - WMS_PROFILES           Comma-separated list of profile names (e.g. "AD,LIMAGRAIN")
 *   - DEFAULT_WMS_PROFILE    Profile activated at startup (optional)
 */

const DEFAULTS = {
  apiPath: '/ApplicationService/api',
  tokenPath: '/EasySTS/OAuth/Token',
  workflowApiPath: '/AD/api',
  application: 'EasyWMS',
  protocol: 'https',
};

const listeners = [];
let profiles = {};
let currentProfileName = null;

/**
 * Parse .env into an in-memory profile registry.
 * Called once at startup; safe to call again after env changes (tests).
 */
function loadProfiles() {
  profiles = {};
  currentProfileName = null;

  const names = (process.env.WMS_PROFILES || '')
    .split(',')
    .map(s => s.trim())
    .filter(Boolean);

  if (names.length === 0) {
    console.error('[Profile] WARNING: WMS_PROFILES is empty — no profiles loaded');
    return;
  }

  const shared = {
    auth: process.env.WMS_API_AUTH,
    application: process.env.WMS_APPLICATION || DEFAULTS.application,
    apiPath: process.env.WMS_API_PATH || DEFAULTS.apiPath,
    tokenPath: process.env.WMS_TOKEN_PATH || DEFAULTS.tokenPath,
    workflowApiPath: process.env.WORKFLOW_API_PATH || DEFAULTS.workflowApiPath,
  };

  for (const name of names) {
    const host = process.env[`${name}_HOST`];
    const username = process.env[`${name}_USERNAME`];
    const password = process.env[`${name}_PASSWORD`];
    const tenant = process.env[`${name}_TENANT`];
    const saasRaw = process.env[`${name}_SAAS`];
    const saas = saasRaw != null && /^(true|1|yes)$/i.test(saasRaw.trim());

    if (!host || !username || !password || !tenant) {
      console.error(`[Profile] WARNING: profile "${name}" is incomplete (missing HOST/USERNAME/PASSWORD/TENANT) — skipped`);
      continue;
    }

    const base = `${DEFAULTS.protocol}://${host}`;
    profiles[name] = {
      name,
      host,
      username,
      password,
      tenant,
      saas,
      auth: shared.auth,
      application: shared.application,
      apiBaseUrl: `${base}${shared.apiPath}`,
      tokenUrl: `${base}${shared.tokenPath}`,
      workflowApiBase: `${base}${shared.workflowApiPath}`,
    };
  }

  const defaultName = process.env.DEFAULT_WMS_PROFILE;
  if (defaultName && profiles[defaultName]) {
    currentProfileName = defaultName;
    console.error(`[Profile] Loaded ${Object.keys(profiles).length} profile(s). Active: ${currentProfileName}`);
  } else if (defaultName) {
    console.error(`[Profile] DEFAULT_WMS_PROFILE="${defaultName}" is not a valid profile — no profile active`);
  } else {
    console.error(`[Profile] Loaded ${Object.keys(profiles).length} profile(s). No default selected — Claude must call switch_wms_profile before any API call`);
  }
}

function listProfiles() {
  return Object.keys(profiles).sort();
}

function getCurrentName() {
  return currentProfileName;
}

/**
 * Return the active profile config. Throws a helpful error if none is selected,
 * so tool responses tell Claude exactly what to do next.
 */
function getCurrent() {
  if (!currentProfileName) {
    const available = listProfiles();
    const hint = available.length > 0
      ? `Available profiles: ${available.join(', ')}. Call switch_wms_profile with one of them.`
      : 'No profiles configured in .env (WMS_PROFILES is empty).';
    throw new Error(`No WMS profile selected. ${hint}`);
  }
  return profiles[currentProfileName];
}

/**
 * Switch to a different profile. Notifies listeners (services) so they can
 * reset token + invalidate caches tied to the previous profile.
 */
function switchTo(name) {
  if (!profiles[name]) {
    const available = listProfiles();
    throw new Error(`Unknown profile "${name}". Available: ${available.join(', ') || '(none)'}`);
  }
  if (name === currentProfileName) {
    return profiles[name];
  }
  const previous = currentProfileName;
  currentProfileName = name;
  console.error(`[Profile] Switched: ${previous || '(none)'} → ${name}`);
  for (const listener of listeners) {
    try {
      listener({ previous, current: name });
    } catch (err) {
      console.error(`[Profile] Listener error: ${err.message}`);
    }
  }
  return profiles[name];
}

/**
 * Register a callback fired whenever the active profile changes.
 * Used by services to invalidate caches / reset tokens.
 */
function onSwitch(listener) {
  listeners.push(listener);
}

module.exports = {
  loadProfiles,
  listProfiles,
  getCurrent,
  getCurrentName,
  switchTo,
  onSwitch,
};