import * as _express from "express";
import * as _session from "express-session";
import * as _bodyParser from "body-parser";
import * as _http from "http";
import {PublicRouter} from "./routes/PublicRouter";
import {UserRouter} from "./routes/UserRouter";
import {GalleryRouter} from "./routes/GalleryRouter";
import {AdminRouter} from "./routes/AdminRouter";
import {ErrorRouter} from "./routes/ErrorRouter";
import {SharingRouter} from "./routes/SharingRouter";
import {ObjectManagerRepository} from "./model/ObjectManagerRepository";
import {Logger} from "./Logger";
import {Config} from "../common/config/private/Config";
import {DatabaseType, ThumbnailProcessingLib} from "../common/config/private/IPrivateConfig";
import {LoggerRouter} from "./routes/LoggerRouter";
import {ProjectPath} from "./ProjectPath";
import {ThumbnailGeneratorMWs} from "./middlewares/thumbnail/ThumbnailGeneratorMWs";
import {DiskManager} from "./model/DiskManger";
import {NotificationRouter} from "./routes/NotificationRouter";
import {NotificationManager} from "./model/NotifocationManager";

const LOG_TAG = "[server]";
export class Server {

  private app: any;
  private server: any;

  constructor() {
    if (process.env.DEBUG) {
      Logger.debug(LOG_TAG, "Running in DEBUG mode");
    }
    this.init();
  }

  async init() {
    Logger.info(LOG_TAG, "running diagnostics...");
    await this.runDiagnostics();
    Logger.info(LOG_TAG, "using config:");
    Logger.info(LOG_TAG, JSON.stringify(Config, null, '\t'));

    this.app = _express();

    LoggerRouter.route(this.app);

    this.app.set('view engine', 'ejs');


    /**
     * Session above all
     */
    this.app.use(_session({
      name: "pigallery2-session",
      secret: 'PiGallery2 secret',
      cookie: {
        maxAge: 60000 * 10,
        httpOnly: false
      },
      resave: true,
      saveUninitialized: false
    }));

    /**
     * Parse parameters in POST
     */
    // for parsing application/json
    this.app.use(_bodyParser.json());

    DiskManager.init();
    ThumbnailGeneratorMWs.init();

    PublicRouter.route(this.app);

    UserRouter.route(this.app);
    GalleryRouter.route(this.app);
    SharingRouter.route(this.app);
    AdminRouter.route(this.app);
    NotificationRouter.route(this.app);

    ErrorRouter.route(this.app);


    // Get PORT from environment and store in Express.
    this.app.set('port', Config.Server.port);

    // Create HTTP server.
    this.server = _http.createServer(this.app);

    //Listen on provided PORT, on all network interfaces.
    this.server.listen(Config.Server.port);
    this.server.on('error', this.onError);
    this.server.on('listening', this.onListening);


  }

  async runDiagnostics() {


    if (Config.Server.database.type == DatabaseType.mysql) {
      try {
        await ObjectManagerRepository.InitMySQLManagers();
      } catch (err) {
        Logger.warn(LOG_TAG, "[MYSQL error]", err);
        Logger.warn(LOG_TAG, "Error during initializing mysql falling back to memory DB");

        NotificationManager.warning("Error during initializing mysql falling back to memory DB", err);
        Config.setDatabaseType(DatabaseType.memory);
        await ObjectManagerRepository.InitMemoryManagers();
      }
    } else {
      await ObjectManagerRepository.InitMemoryManagers();
    }

    if (Config.Server.thumbnail.processingLibrary == ThumbnailProcessingLib.sharp) {
      try {
        const sharp = require("sharp");
        sharp();

      } catch (err) {
        NotificationManager.warning("Thumbnail hardware acceleration is not possible." +
          " 'Sharp' node module is not found." +
          " Falling back to JS based thumbnail generation", err);
        Logger.warn(LOG_TAG, "[Thumbnail hardware acceleration] sharp module error: ", err);
        Logger.warn(LOG_TAG, "Thumbnail hardware acceleration is not possible." +
          " 'Sharp' node module is not found." +
          " Falling back to JS based thumbnail generation");
        Config.Server.thumbnail.processingLibrary = ThumbnailProcessingLib.Jimp;
      }
    }


    if (Config.Server.thumbnail.processingLibrary == ThumbnailProcessingLib.gm) {
      try {
        const gm = require("gm");
        gm(ProjectPath.FrontendFolder + "/assets/icon.png").size((err, value) => {
          if (!err) {
            return;
          }
          NotificationManager.warning("Thumbnail hardware acceleration is not possible." +
            " 'gm' node module is not found." +
            " Falling back to JS based thumbnail generation", err);
          Logger.warn(LOG_TAG, "[Thumbnail hardware acceleration] gm module error: ", err);
          Logger.warn(LOG_TAG, "Thumbnail hardware acceleration is not possible." +
            " 'gm' node module is not found." +
            " Falling back to JS based thumbnail generation");
          Config.Server.thumbnail.processingLibrary = ThumbnailProcessingLib.Jimp;
        });

      } catch (err) {
        NotificationManager.warning("Thumbnail hardware acceleration is not possible." +
          " 'gm' node module is not found." +
          " Falling back to JS based thumbnail generation", err);
        Logger.warn(LOG_TAG, "[Thumbnail hardware acceleration] gm module error: ", err);
        Logger.warn(LOG_TAG, "Thumbnail hardware acceleration is not possible." +
          " 'gm' node module is not found." +
          " Falling back to JS based thumbnail generation");
        Config.Server.thumbnail.processingLibrary = ThumbnailProcessingLib.Jimp;
      }
    }

    if (Config.Client.Search.searchEnabled == true &&
      ObjectManagerRepository.getInstance().SearchManager.isSupported() == false) {

      NotificationManager.warning("Search is not supported with these settings, switching off..");
      Logger.warn(LOG_TAG, "Search is not supported with these settings, switching off..");
      Config.Client.Search.searchEnabled = false;
    }
    if (Config.Client.Sharing.enabled == true &&
      ObjectManagerRepository.getInstance().SharingManager.isSupported() == false) {

      NotificationManager.warning("Sharing is not supported with these settings, switching off..");
      Logger.warn(LOG_TAG, "Sharing is not supported with these settings, switching off..");
      Config.Client.Sharing.enabled = false;
    }
  }


  /**
   * Event listener for HTTP server "error" event.
   */
  private onError = (error: any) => {
    if (error.syscall !== 'listen') {
      throw error;
    }

    const bind = typeof Config.Server.port === 'string'
      ? 'Pipe ' + Config.Server.port
      : 'Port ' + Config.Server.port;

    // handle specific listen error with friendly messages
    switch (error.code) {
      case 'EACCES':
        Logger.error(LOG_TAG, bind + ' requires elevated privileges');
        process.exit(1);
        break;
      case 'EADDRINUSE':
        Logger.error(LOG_TAG, bind + ' is already in use');
        process.exit(1);
        break;
      default:
        throw error;
    }
  };


  /**
   * Event listener for HTTP server "listening" event.
   */
  private onListening = () => {
    let addr = this.server.address();
    const bind = typeof addr === 'string'
      ? 'pipe ' + addr
      : 'port ' + addr.port;
    Logger.info(LOG_TAG, 'Listening on ' + bind);
  };

}