const { execSync } = require('child_process');

const config = {
  port: parseInt(process.env.PORT, 10) || 8888,

  baseDomain: process.env.BASE_DOMAIN || '',

  projectPortStart: parseInt(process.env.PROJECT_PORT_START, 10) || 9000,
  projectPortEnd: parseInt(process.env.PROJECT_PORT_END, 10) || 9100,
  
  projectBindAddress: process.env.PROJECT_BIND_ADDRESS || '127.0.0.1',

  useNginx: process.env.USE_NGINX || 'auto',
  nginxConfigDir: process.env.NGINX_CONFIG_DIR || './nginx/sites-enabled',
  nginxTemplatePath: process.env.NGINX_TEMPLATE_PATH || './server/templates/nginx',
  nginxReloadCmd: process.env.NGINX_RELOAD_CMD || 'nginx -s reload',
  nginxTestCmd: process.env.NGINX_TEST_CMD || 'nginx -t',

  nginxAvailable: null,
  actualMode: null,

  checkNginxMode() {
    if (this.actualMode !== null) {
      return this.actualMode;
    }

    if (this.useNginx === true || this.useNginx === 'true') {
      this.nginxAvailable = true;
      this.actualMode = 'nginx';
      return 'nginx';
    }

    if (this.useNginx === false || this.useNginx === 'false') {
      this.nginxAvailable = false;
      this.actualMode = 'multiport';
      return 'multiport';
    }

    if (this.useNginx === 'auto') {
      this.nginxAvailable = this._testNginxAvailable();
      this.actualMode = this.nginxAvailable ? 'nginx' : 'multiport';
      return this.actualMode;
    }

    this.nginxAvailable = this._testNginxAvailable();
    this.actualMode = this.nginxAvailable ? 'nginx' : 'multiport';
    return this.actualMode;
  },

  _testNginxAvailable() {
    try {
      execSync('nginx -v 2>&1', { stdio: 'pipe' });
      return true;
    } catch (error) {
      return false;
    }
  },

  isNginxMode() {
    if (this.actualMode === null) {
      this.checkNginxMode();
    }
    return this.actualMode === 'nginx';
  },

  getProjectUrl(projectId, port) {
    if (this.isNginxMode()) {
      const baseUrl = this.getBaseUrl();
      return `${baseUrl}/project/${projectId}/`;
    }
    const domain = this.baseDomain || 'localhost';
    return `http://${domain}:${port}`;
  },

  getBaseUrl() {
    if (this.baseDomain) {
      return `http://${this.baseDomain}`;
    }
    return `http://localhost:${this.port}`;
  },

  isProduction() {
    return !!this.baseDomain;
  }
};

module.exports = config;