// A Config object provides information about how a specific app is
// configured.
// mount is the URL for the root of the API; includes http, domain, etc.

import cache from './cache';

function removeTrailingSlash(str) {
  if (!str) {
    return str;
  }
  if (str.endsWith("/")) {
    str = str.substr(0, str.length-1);
  }
  return str;
}

export class Config {
  constructor(applicationId: string, mount: string) {
    let DatabaseAdapter = require('./DatabaseAdapter');
    let cacheInfo = cache.apps.get(applicationId);
    if (!cacheInfo) {
      return;
    }

    this.applicationId = applicationId;
    this.masterKey = cacheInfo.masterKey;
    this.clientKey = cacheInfo.clientKey;
    this.javascriptKey = cacheInfo.javascriptKey;
    this.dotNetKey = cacheInfo.dotNetKey;
    this.restAPIKey = cacheInfo.restAPIKey;
    this.fileKey = cacheInfo.fileKey;
    this.facebookAppIds = cacheInfo.facebookAppIds;
    this.allowClientClassCreation = cacheInfo.allowClientClassCreation;
    this.database = DatabaseAdapter.getDatabaseConnection(applicationId, cacheInfo.collectionPrefix);

    this.serverURL = cacheInfo.serverURL;
    this.publicServerURL = removeTrailingSlash(cacheInfo.publicServerURL);
    this.verifyUserEmails = cacheInfo.verifyUserEmails;
    this.appName = cacheInfo.appName;

    this.hooksController = cacheInfo.hooksController;
    this.filesController = cacheInfo.filesController;
    this.pushController = cacheInfo.pushController;
    this.loggerController = cacheInfo.loggerController;
    this.userController = cacheInfo.userController;
    this.authDataManager = cacheInfo.authDataManager;
    this.customPages = cacheInfo.customPages || {};
    this.mount = removeTrailingSlash(mount);
    this.liveQueryController = cacheInfo.liveQueryController;
    this.sessionLength = cacheInfo.sessionLength;
    this.generateSessionExpiresAt = this.generateSessionExpiresAt.bind(this);
    this.revokeSessionOnPasswordReset = cacheInfo.revokeSessionOnPasswordReset;
  }

  static validate(options) {
    this.validateEmailConfiguration({
      verifyUserEmails: options.verifyUserEmails,
      appName: options.appName,
      publicServerURL: options.publicServerURL
    })

    if (typeof options.revokeSessionOnPasswordReset !== 'boolean') {
      throw 'revokeSessionOnPasswordReset must be a boolean value';
    }

    if (options.publicServerURL) {
      if (!options.publicServerURL.startsWith("http://") && !options.publicServerURL.startsWith("https://")) {
        throw "publicServerURL should be a valid HTTPS URL starting with https://"
      }
    }

    this.validateSessionLength(options.sessionLength);
  }

  static validateEmailConfiguration({verifyUserEmails, appName, publicServerURL}) {
    if (verifyUserEmails) {
      if (typeof appName !== 'string') {
        throw 'An app name is required when using email verification.';
      }
      if (typeof publicServerURL !== 'string') {
        throw 'A public server url is required when using email verification.';
      }
    }
  }

  get mount() {
    var mount = this._mount;
    if (this.publicServerURL) {
      mount = this.publicServerURL;
    }
    return mount;
  }

  set mount(newValue) {
    this._mount = newValue;
  }

  static validateSessionLength(sessionLength) {
    if(isNaN(sessionLength)) {
      throw 'Session length must be a valid number.';
    }
    else if(sessionLength <= 0) {
      throw 'Session length must be a value greater than 0.'
    }
  }

  generateSessionExpiresAt() {
    var now = new Date();
    return new Date(now.getTime() + (this.sessionLength*1000));
  }

  get invalidLinkURL() {
    return this.customPages.invalidLink || `${this.publicServerURL}/apps/invalid_link.html`;
  }

  get verifyEmailSuccessURL() {
    return this.customPages.verifyEmailSuccess || `${this.publicServerURL}/apps/verify_email_success.html`;
  }

  get choosePasswordURL() {
    return this.customPages.choosePassword || `${this.publicServerURL}/apps/choose_password`;
  }

  get requestResetPasswordURL() {
    return `${this.publicServerURL}/apps/${this.applicationId}/request_password_reset`;
  }

  get passwordResetSuccessURL() {
    return this.customPages.passwordResetSuccess || `${this.publicServerURL}/apps/password_reset_success.html`;
  }

  get verifyEmailURL() {
    return `${this.publicServerURL}/apps/${this.applicationId}/verify_email`;
  }
};

export default Config;
module.exports = Config;