/**
 * State persistence for the native host.
 * Loads and saves all persistent data (tunnels, settings, connections) to state.json.
 * Handles migration from the legacy holesail-persist.json format.
 */

const path = require('bare-path');
const fs = require('bare-fs');

const STATE_FILENAME = 'state.json';
const LEGACY_PERSIST_FILENAME = 'holesail-persist.json';

const SETTINGS_DEFAULTS = {
  proxyPort: 8443,
  connectProxyPort: 8442,
  readyTimeoutMs: 30000,
  notifyOnDisconnect: true,
  notifyOnTunnelError: true,
  debug: false,
  disableOnFileUrls: false,
  backupRetention: 5,
  backupIntervalHours: 0,
  tunnelAutoReconnect: true,
  latencyPingEnabled: false,
  latencyPingIntervalMs: 5000,
  dashboardRefreshIntervalMs: 2000
};

const DEBUG = process.env.HOLESAIL_DEBUG === '1' || process.env.HOLESAIL_DEBUG === 'true';
function debugLog(...args) {
  if (!DEBUG) return;
  const msg = '[holesail-manager:debug] ' + args.map(a => typeof a === 'object' ? JSON.stringify(a) : String(a)).join(' ');
  if (process.stderr) process.stderr.write(msg + '\n');
}

let stateFilePath = null;

function setStoragePath(baseDir) {
  if (baseDir && typeof baseDir === 'string') {
    stateFilePath = path.join(baseDir, STATE_FILENAME);
  }
}

function getStatePath() {
  if (stateFilePath) return stateFilePath;
  const base = process.env.HOLESAIL_BROWSER_STORAGE || path.join(__dirname, '..', 'holesail-browser-storage');
  stateFilePath = path.join(base, STATE_FILENAME);
  return stateFilePath;
}

/** Create the storage directory if it does not exist (e.g. fresh install on Windows). */
function ensureStorageDir() {
  const dir = path.dirname(getStatePath());
  try {
    fs.mkdirSync(dir, { recursive: true });
  } catch (e) {
    if (process.stderr) process.stderr.write('[holesail-manager] could not create storage dir: ' + e.message + '\n');
  }
}

function getLegacyPersistPath() {
  const dir = path.dirname(getStatePath());
  return path.join(dir, LEGACY_PERSIST_FILENAME);
}

function buildDefaultState() {
  return {
    settings: { ...SETTINGS_DEFAULTS },
    servers: [],
    virtualHosts: [],
    serviceTunnels: [],
    sshConnections: [],
    rdpConnections: [],
    nextServerId: 0,
    nextServiceTunnelId: 0
  };
}

function saveStateSync(data) {
  const file = getStatePath();
  const json = JSON.stringify(data, null, 2);
  try {
    fs.mkdirSync(path.dirname(file), { recursive: true });
    fs.writeFileSync(file, json, 'utf8');
    debugLog('state saved path=', file);
  } catch (e) {
    if (process.stderr) process.stderr.write('[holesail-manager] state save failed: ' + e.message + ' (path: ' + file + ')\n');
  }
}

function loadState() {
  const file = getStatePath();

  try {
    const raw = fs.readFileSync(file, 'utf8');
    const trimmed = raw && typeof raw === 'string' ? raw.trim() : '';
    if (!trimmed) return buildDefaultState();
    const data = JSON.parse(raw);
    if (!data || typeof data !== 'object') return buildDefaultState();
    const out = {
      settings: (data.settings && typeof data.settings === 'object') ? { ...SETTINGS_DEFAULTS, ...data.settings } : { ...SETTINGS_DEFAULTS },
      servers: Array.isArray(data.servers) ? data.servers : [],
      virtualHosts: Array.isArray(data.virtualHosts) ? data.virtualHosts : [],
      serviceTunnels: Array.isArray(data.serviceTunnels) ? data.serviceTunnels : [],
      sshConnections: Array.isArray(data.sshConnections) ? data.sshConnections : [],
      rdpConnections: Array.isArray(data.rdpConnections) ? data.rdpConnections : [],
      nextServerId: typeof data.nextServerId === 'number' ? data.nextServerId : 0,
      nextServiceTunnelId: typeof data.nextServiceTunnelId === 'number' ? data.nextServiceTunnelId : 0
    };
    debugLog('state loaded path=', file, 'servers=', out.servers.length, 'vhosts=', out.virtualHosts.length);
    if (process.stderr && (out.servers.length || out.virtualHosts.length)) {
      process.stderr.write('[holesail-manager] state loaded from ' + file + ' (servers=' + out.servers.length + ' vhosts=' + out.virtualHosts.length + ')\n');
    }
    return out;
  } catch (e) {
    if (e && e.code !== 'ENOENT') {
      if (process.stderr) process.stderr.write('[holesail-manager] state load failed: ' + e.message + '\n');
      return buildDefaultState();
    }
  }

  // state.json not found — try migrating from legacy holesail-persist.json
  const legacyFile = getLegacyPersistPath();
  try {
    const raw = fs.readFileSync(legacyFile, 'utf8');
    const trimmed = raw && typeof raw === 'string' ? raw.trim() : '';
    if (!trimmed) return buildDefaultState();
    const data = JSON.parse(raw);
    if (process.stderr) process.stderr.write('[holesail-manager] migrating from ' + legacyFile + ' to ' + file + '\n');
    const out = {
      settings: { ...SETTINGS_DEFAULTS },
      servers: Array.isArray(data.servers) ? data.servers : [],
      virtualHosts: Array.isArray(data.virtualHosts) ? data.virtualHosts : [],
      serviceTunnels: Array.isArray(data.serviceTunnels) ? data.serviceTunnels : [],
      sshConnections: Array.isArray(data.sshConnections) ? data.sshConnections : [],
      rdpConnections: Array.isArray(data.rdpConnections) ? data.rdpConnections : [],
      nextServerId: typeof data.nextServerId === 'number' ? data.nextServerId : 0,
      nextServiceTunnelId: typeof data.nextServiceTunnelId === 'number' ? data.nextServiceTunnelId : 0
    };
    try { fs.unlinkSync(legacyFile); } catch (_) {}
    if (process.stderr) process.stderr.write('[holesail-manager] migration complete, legacy file removed\n');
    return out;
  } catch (e) {
    if (e && e.code !== 'ENOENT') {
      if (process.stderr) process.stderr.write('[holesail-manager] legacy persist load failed: ' + e.message + '\n');
    }
  }

  return buildDefaultState();
}

module.exports = { SETTINGS_DEFAULTS, setStoragePath, loadState, saveStateSync, buildDefaultState, ensureStorageDir };