// ParseServer - open-source compatible API Server for Parse apps

var batch = require('./batch'),
  bodyParser = require('body-parser'),
  express = require('express'),
  middlewares = require('./middlewares'),
  Parse = require('parse/node').Parse,
  { parse } = require('graphql'),
  path = require('path'),
  fs = require('fs');

import { ParseServerOptions, LiveQueryServerOptions } from './Options';
import defaults from './defaults';
import * as logging from './logger';
import Config from './Config';
import PromiseRouter from './PromiseRouter';
import requiredParameter from './requiredParameter';
import { AnalyticsRouter } from './Routers/AnalyticsRouter';
import { ClassesRouter } from './Routers/ClassesRouter';
import { FeaturesRouter } from './Routers/FeaturesRouter';
import { FilesRouter } from './Routers/FilesRouter';
import { FunctionsRouter } from './Routers/FunctionsRouter';
import { GlobalConfigRouter } from './Routers/GlobalConfigRouter';
import { GraphQLRouter } from './Routers/GraphQLRouter';
import { HooksRouter } from './Routers/HooksRouter';
import { IAPValidationRouter } from './Routers/IAPValidationRouter';
import { InstallationsRouter } from './Routers/InstallationsRouter';
import { LogsRouter } from './Routers/LogsRouter';
import { ParseLiveQueryServer } from './LiveQuery/ParseLiveQueryServer';
import { PagesRouter } from './Routers/PagesRouter';
import { PublicAPIRouter } from './Routers/PublicAPIRouter';
import { PushRouter } from './Routers/PushRouter';
import { CloudCodeRouter } from './Routers/CloudCodeRouter';
import { RolesRouter } from './Routers/RolesRouter';
import { SchemasRouter } from './Routers/SchemasRouter';
import { SessionsRouter } from './Routers/SessionsRouter';
import { UsersRouter } from './Routers/UsersRouter';
import { PurgeRouter } from './Routers/PurgeRouter';
import { AudiencesRouter } from './Routers/AudiencesRouter';
import { AggregateRouter } from './Routers/AggregateRouter';
import { ParseServerRESTController } from './ParseServerRESTController';
import * as controllers from './Controllers';
import { ParseGraphQLServer } from './GraphQL/ParseGraphQLServer';
import { SecurityRouter } from './Routers/SecurityRouter';
import CheckRunner from './Security/CheckRunner';
import Deprecator from './Deprecator/Deprecator';
import { DefinedSchemas } from './SchemaMigrations/DefinedSchemas';
import OptionsDefinitions from './Options/Definitions';

// Mutate the Parse object to add the Cloud Code handlers
addParseCloud();

// ParseServer works like a constructor of an express app.
// https://parseplatform.org/parse-server/api/master/ParseServerOptions.html
class ParseServer {
  /**
   * @constructor
   * @param {ParseServerOptions} options the parse server initialization options
   */
  constructor(options: ParseServerOptions) {
    // Scan for deprecated Parse Server options
    Deprecator.scanParseServerOptions(options);

    const interfaces = JSON.parse(JSON.stringify(OptionsDefinitions));

    function getValidObject(root) {
      const result = {};
      for (const key in root) {
        if (Object.prototype.hasOwnProperty.call(root[key], 'type')) {
          if (root[key].type.endsWith('[]')) {
            result[key] = [getValidObject(interfaces[root[key].type.slice(0, -2)])];
          } else {
            result[key] = getValidObject(interfaces[root[key].type]);
          }
        } else {
          result[key] = '';
        }
      }
      return result;
    }

    const optionsBlueprint = getValidObject(interfaces['ParseServerOptions']);

    function validateKeyNames(original, ref, name = '') {
      let result = [];
      const prefix = name + (name !== '' ? '.' : '');
      for (const key in original) {
        if (!Object.prototype.hasOwnProperty.call(ref, key)) {
          result.push(prefix + key);
        } else {
          if (ref[key] === '') { continue; }
          let res = [];
          if (Array.isArray(original[key]) && Array.isArray(ref[key])) {
            const type = ref[key][0];
            original[key].forEach((item, idx) => {
              if (typeof item === 'object' && item !== null) {
                res = res.concat(validateKeyNames(item, type, prefix + key + `[${idx}]`));
              }
            });
          } else if (typeof original[key] === 'object' && typeof ref[key] === 'object') {
            res = validateKeyNames(original[key], ref[key], prefix + key);
          }
          result = result.concat(res);
        }
      }
      return result;
    }

    const diff = validateKeyNames(options, optionsBlueprint);
    if (diff.length > 0) {
      const logger = logging.logger;
      logger.error(`Invalid key(s) found in Parse Server configuration: ${diff.join(', ')}`);
    }

    // Set option defaults
    injectDefaults(options);
    const {
      appId = requiredParameter('You must provide an appId!'),
      masterKey = requiredParameter('You must provide a masterKey!'),
      javascriptKey,
      serverURL = requiredParameter('You must provide a serverURL!'),
    } = options;
    // Initialize the node client SDK automatically
    Parse.initialize(appId, javascriptKey || 'unused', masterKey);
    Parse.serverURL = serverURL;
    Config.validateOptions(options);
    const allControllers = controllers.getControllers(options);

    options.state = 'initialized';
    this.config = Config.put(Object.assign({}, options, allControllers));
    this.config.masterKeyIpsStore = new Map();
    this.config.maintenanceKeyIpsStore = new Map();
    logging.setLogger(allControllers.loggerController);
  }

  /**
   * Starts Parse Server as an express app; this promise resolves when Parse Server is ready to accept requests.
   */

  async start() {
    try {
      if (this.config.state === 'ok') {
        return this;
      }
      this.config.state = 'starting';
      Config.put(this.config);
      const {
        databaseController,
        hooksController,
        cacheController,
        cloud,
        security,
        schema,
        liveQueryController,
      } = this.config;
      try {
        await databaseController.performInitialization();
      } catch (e) {
        if (e.code !== Parse.Error.DUPLICATE_VALUE) {
          throw e;
        }
      }
      const pushController = await controllers.getPushController(this.config);
      await hooksController.load();
      const startupPromises = [this.config.loadMasterKey?.()];
      if (schema) {
        startupPromises.push(new DefinedSchemas(schema, this.config).execute());
      }
      if (
        cacheController.adapter?.connect &&
        typeof cacheController.adapter.connect === 'function'
      ) {
        startupPromises.push(cacheController.adapter.connect());
      }
      startupPromises.push(liveQueryController.connect());
      await Promise.all(startupPromises);
      if (cloud) {
        addParseCloud();
        if (typeof cloud === 'function') {
          await Promise.resolve(cloud(Parse));
        } else if (typeof cloud === 'string') {
          let json;
          if (process.env.npm_package_json) {
            json = require(process.env.npm_package_json);
          }
          if (process.env.npm_package_type === 'module' || json?.type === 'module') {
            await import(path.resolve(process.cwd(), cloud));
          } else {
            require(path.resolve(process.cwd(), cloud));
          }
        } else {
          throw "argument 'cloud' must either be a string or a function";
        }
        await new Promise(resolve => setTimeout(resolve, 10));
      }
      if (security && security.enableCheck && security.enableCheckLog) {
        new CheckRunner(security).run();
      }
      this.config.state = 'ok';
      this.config = { ...this.config, ...pushController };
      Config.put(this.config);
      return this;
    } catch (error) {
      // eslint-disable-next-line no-console
      console.error(error);
      this.config.state = 'error';
      throw error;
    }
  }

  get app() {
    if (!this._app) {
      this._app = ParseServer.app(this.config);
    }
    return this._app;
  }

  handleShutdown() {
    const promises = [];
    const { adapter: databaseAdapter } = this.config.databaseController;
    if (databaseAdapter && typeof databaseAdapter.handleShutdown === 'function') {
      promises.push(databaseAdapter.handleShutdown());
    }
    const { adapter: fileAdapter } = this.config.filesController;
    if (fileAdapter && typeof fileAdapter.handleShutdown === 'function') {
      promises.push(fileAdapter.handleShutdown());
    }
    const { adapter: cacheAdapter } = this.config.cacheController;
    if (cacheAdapter && typeof cacheAdapter.handleShutdown === 'function') {
      promises.push(cacheAdapter.handleShutdown());
    }
    if (this.liveQueryServer?.server?.close) {
      promises.push(new Promise(resolve => this.liveQueryServer.server.close(resolve)));
    }
    if (this.liveQueryServer) {
      promises.push(this.liveQueryServer.shutdown());
    }
    return (promises.length > 0 ? Promise.all(promises) : Promise.resolve()).then(() => {
      if (this.config.serverCloseComplete) {
        this.config.serverCloseComplete();
      }
    });
  }

  /**
   * @static
   * Create an express app for the parse server
   * @param {Object} options let you specify the maxUploadSize when creating the express app  */
  static app(options) {
    const { maxUploadSize = '20mb', appId, directAccess, pages, rateLimit = [] } = options;
    // This app serves the Parse API directly.
    // It's the equivalent of https://api.parse.com/1 in the hosted Parse API.
    var api = express();
    //api.use("/apps", express.static(__dirname + "/public"));
    api.use(middlewares.allowCrossDomain(appId));
    // File handling needs to be before default middlewares are applied
    api.use(
      '/',
      new FilesRouter().expressRouter({
        maxUploadSize: maxUploadSize,
      })
    );

    api.use('/health', function (req, res) {
      res.status(options.state === 'ok' ? 200 : 503);
      if (options.state === 'starting') {
        res.set('Retry-After', 1);
      }
      res.json({
        status: options.state,
      });
    });

    api.use(
      '/',
      bodyParser.urlencoded({ extended: false }),
      pages.enableRouter
        ? new PagesRouter(pages).expressRouter()
        : new PublicAPIRouter().expressRouter()
    );

    api.use(bodyParser.json({ type: '*/*', limit: maxUploadSize }));
    api.use(middlewares.allowMethodOverride);
    api.use(middlewares.handleParseHeaders);
    const routes = Array.isArray(rateLimit) ? rateLimit : [rateLimit];
    for (const route of routes) {
      middlewares.addRateLimit(route, options);
    }
    api.use(middlewares.handleParseSession);

    const appRouter = ParseServer.promiseRouter({ appId });
    api.use(appRouter.expressRouter());

    api.use(middlewares.handleParseErrors);

    // run the following when not testing
    if (!process.env.TESTING) {
      //This causes tests to spew some useless warnings, so disable in test
      /* istanbul ignore next */
      process.on('uncaughtException', err => {
        if (err.code === 'EADDRINUSE') {
          // user-friendly message for this common error
          process.stderr.write(`Unable to listen on port ${err.port}. The port is already in use.`);
          process.exit(0);
        } else {
          if (err.message) {
            process.stderr.write('An uncaught exception occurred: ' + err.message);
          }
          if (err.stack) {
            process.stderr.write('Stack Trace:\n' + err.stack);
          } else {
            process.stderr.write(err);
          }
          process.exit(1);
        }
      });
      // verify the server url after a 'mount' event is received
      /* istanbul ignore next */
      api.on('mount', async function () {
        await new Promise(resolve => setTimeout(resolve, 1000));
        ParseServer.verifyServerUrl();
      });
    }
    if (process.env.PARSE_SERVER_ENABLE_EXPERIMENTAL_DIRECT_ACCESS === '1' || directAccess) {
      Parse.CoreManager.setRESTController(ParseServerRESTController(appId, appRouter));
    }
    return api;
  }

  static promiseRouter({ appId }) {
    const routers = [
      new ClassesRouter(),
      new UsersRouter(),
      new SessionsRouter(),
      new RolesRouter(),
      new AnalyticsRouter(),
      new InstallationsRouter(),
      new FunctionsRouter(),
      new SchemasRouter(),
      new PushRouter(),
      new LogsRouter(),
      new IAPValidationRouter(),
      new FeaturesRouter(),
      new GlobalConfigRouter(),
      new GraphQLRouter(),
      new PurgeRouter(),
      new HooksRouter(),
      new CloudCodeRouter(),
      new AudiencesRouter(),
      new AggregateRouter(),
      new SecurityRouter(),
    ];

    const routes = routers.reduce((memo, router) => {
      return memo.concat(router.routes);
    }, []);

    const appRouter = new PromiseRouter(routes, appId);

    batch.mountOnto(appRouter);
    return appRouter;
  }

  /**
   * starts the parse server's express app
   * @param {ParseServerOptions} options to use to start the server
   * @returns {ParseServer} the parse server instance
   */

  async startApp(options: ParseServerOptions) {
    try {
      await this.start();
    } catch (e) {
      // eslint-disable-next-line no-console
      console.error('Error on ParseServer.startApp: ', e);
      throw e;
    }
    const app = express();
    if (options.middleware) {
      let middleware;
      if (typeof options.middleware == 'string') {
        middleware = require(path.resolve(process.cwd(), options.middleware));
      } else {
        middleware = options.middleware; // use as-is let express fail
      }
      app.use(middleware);
    }
    app.use(options.mountPath, this.app);

    if (options.mountGraphQL === true || options.mountPlayground === true) {
      let graphQLCustomTypeDefs = undefined;
      if (typeof options.graphQLSchema === 'string') {
        graphQLCustomTypeDefs = parse(fs.readFileSync(options.graphQLSchema, 'utf8'));
      } else if (
        typeof options.graphQLSchema === 'object' ||
        typeof options.graphQLSchema === 'function'
      ) {
        graphQLCustomTypeDefs = options.graphQLSchema;
      }

      const parseGraphQLServer = new ParseGraphQLServer(this, {
        graphQLPath: options.graphQLPath,
        playgroundPath: options.playgroundPath,
        graphQLCustomTypeDefs,
      });

      if (options.mountGraphQL) {
        parseGraphQLServer.applyGraphQL(app);
      }

      if (options.mountPlayground) {
        parseGraphQLServer.applyPlayground(app);
      }
    }
    const server = await new Promise(resolve => {
      app.listen(options.port, options.host, function () {
        resolve(this);
      });
    });
    this.server = server;

    if (options.startLiveQueryServer || options.liveQueryServerOptions) {
      this.liveQueryServer = await ParseServer.createLiveQueryServer(
        server,
        options.liveQueryServerOptions,
        options
      );
    }
    if (options.trustProxy) {
      app.set('trust proxy', options.trustProxy);
    }
    /* istanbul ignore next */
    if (!process.env.TESTING) {
      configureListeners(this);
    }
    this.expressApp = app;
    return this;
  }

  /**
   * Creates a new ParseServer and starts it.
   * @param {ParseServerOptions} options used to start the server
   * @returns {ParseServer} the parse server instance
   */
  static async startApp(options: ParseServerOptions) {
    const parseServer = new ParseServer(options);
    return parseServer.startApp(options);
  }

  /**
   * Helper method to create a liveQuery server
   * @static
   * @param {Server} httpServer an optional http server to pass
   * @param {LiveQueryServerOptions} config options for the liveQueryServer
   * @param {ParseServerOptions} options options for the ParseServer
   * @returns {Promise<ParseLiveQueryServer>} the live query server instance
   */
  static async createLiveQueryServer(
    httpServer,
    config: LiveQueryServerOptions,
    options: ParseServerOptions
  ) {
    if (!httpServer || (config && config.port)) {
      var app = express();
      httpServer = require('http').createServer(app);
      httpServer.listen(config.port);
    }
    const server = new ParseLiveQueryServer(httpServer, config, options);
    await server.connect();
    return server;
  }

  static async verifyServerUrl() {
    // perform a health check on the serverURL value
    if (Parse.serverURL) {
      const isValidHttpUrl = string => {
        let url;
        try {
          url = new URL(string);
        } catch (_) {
          return false;
        }
        return url.protocol === 'http:' || url.protocol === 'https:';
      };
      const url = `${Parse.serverURL.replace(/\/$/, '')}/health`;
      if (!isValidHttpUrl(url)) {
        // eslint-disable-next-line no-console
        console.warn(
          `\nWARNING, Unable to connect to '${Parse.serverURL}' as the URL is invalid.` +
            ` Cloud code and push notifications may be unavailable!\n`
        );
        return;
      }
      const request = require('./request');
      const response = await request({ url }).catch(response => response);
      const json = response.data || null;
      const retry = response.headers?.['retry-after'];
      if (retry) {
        await new Promise(resolve => setTimeout(resolve, retry * 1000));
        return this.verifyServerUrl();
      }
      if (response.status !== 200 || json?.status !== 'ok') {
        /* eslint-disable no-console */
        console.warn(
          `\nWARNING, Unable to connect to '${Parse.serverURL}'.` +
            ` Cloud code and push notifications may be unavailable!\n`
        );
        /* eslint-enable no-console */
        return;
      }
      return true;
    }
  }
}

function addParseCloud() {
  const ParseCloud = require('./cloud-code/Parse.Cloud');
  const ParseServer = require('./cloud-code/Parse.Server');
  Object.defineProperty(Parse, 'Server', {
    get() {
      const conf = Config.get(Parse.applicationId);
      return { ...conf, ...ParseServer };
    },
    set(newVal) {
      newVal.appId = Parse.applicationId;
      Config.put(newVal);
    },
    configurable: true,
  });
  Object.assign(Parse.Cloud, ParseCloud);
  global.Parse = Parse;
}

function injectDefaults(options: ParseServerOptions) {
  Object.keys(defaults).forEach(key => {
    if (!Object.prototype.hasOwnProperty.call(options, key)) {
      options[key] = defaults[key];
    }
  });

  if (!Object.prototype.hasOwnProperty.call(options, 'serverURL')) {
    options.serverURL = `http://localhost:${options.port}${options.mountPath}`;
  }

  // Reserved Characters
  if (options.appId) {
    const regex = /[!#$%'()*+&/:;=?@[\]{}^,|<>]/g;
    if (options.appId.match(regex)) {
      // eslint-disable-next-line no-console
      console.warn(
        `\nWARNING, appId that contains special characters can cause issues while using with urls.\n`
      );
    }
  }

  // Backwards compatibility
  if (options.userSensitiveFields) {
    /* eslint-disable no-console */
    !process.env.TESTING &&
      console.warn(
        `\nDEPRECATED: userSensitiveFields has been replaced by protectedFields allowing the ability to protect fields in all classes with CLP. \n`
      );
    /* eslint-enable no-console */

    const userSensitiveFields = Array.from(
      new Set([...(defaults.userSensitiveFields || []), ...(options.userSensitiveFields || [])])
    );

    // If the options.protectedFields is unset,
    // it'll be assigned the default above.
    // Here, protect against the case where protectedFields
    // is set, but doesn't have _User.
    if (!('_User' in options.protectedFields)) {
      options.protectedFields = Object.assign({ _User: [] }, options.protectedFields);
    }

    options.protectedFields['_User']['*'] = Array.from(
      new Set([...(options.protectedFields['_User']['*'] || []), ...userSensitiveFields])
    );
  }

  // Merge protectedFields options with defaults.
  Object.keys(defaults.protectedFields).forEach(c => {
    const cur = options.protectedFields[c];
    if (!cur) {
      options.protectedFields[c] = defaults.protectedFields[c];
    } else {
      Object.keys(defaults.protectedFields[c]).forEach(r => {
        const unq = new Set([
          ...(options.protectedFields[c][r] || []),
          ...defaults.protectedFields[c][r],
        ]);
        options.protectedFields[c][r] = Array.from(unq);
      });
    }
  });
}

// Those can't be tested as it requires a subprocess
/* istanbul ignore next */
function configureListeners(parseServer) {
  const server = parseServer.server;
  const sockets = {};
  /* Currently, express doesn't shut down immediately after receiving SIGINT/SIGTERM if it has client connections that haven't timed out. (This is a known issue with node - https://github.com/nodejs/node/issues/2642)
    This function, along with `destroyAliveConnections()`, intend to fix this behavior such that parse server will close all open connections and initiate the shutdown process as soon as it receives a SIGINT/SIGTERM signal. */
  server.on('connection', socket => {
    const socketId = socket.remoteAddress + ':' + socket.remotePort;
    sockets[socketId] = socket;
    socket.on('close', () => {
      delete sockets[socketId];
    });
  });

  const destroyAliveConnections = function () {
    for (const socketId in sockets) {
      try {
        sockets[socketId].destroy();
      } catch (e) {
        /* */
      }
    }
  };

  const handleShutdown = function () {
    process.stdout.write('Termination signal received. Shutting down.');
    destroyAliveConnections();
    server.close();
    parseServer.handleShutdown();
  };
  process.on('SIGTERM', handleShutdown);
  process.on('SIGINT', handleShutdown);
}

export default ParseServer;
