/*****************************************************************************\
|                                               ( )_  _                       |
|    _ _    _ __   _ _    __    ___ ___     _ _ | ,_)(_)  ___   ___     _     |
|   ( '_`\ ( '__)/'_` ) /'_ `\/' _ ` _ `\ /'_` )| |  | |/',__)/' _ `\ /'_`\   |
|   | (_) )| |  ( (_| |( (_) || ( ) ( ) |( (_| || |_ | |\__, \| ( ) |( (_) )  |
|   | ,__/'(_)  `\__,_)`\__  |(_) (_) (_)`\__,_)`\__)(_)(____/(_) (_)`\___/'  |
|   | |                ( )_) |                                                |
|   (_)                 \___/'                                                |
|                                                                             |
| General Bots Copyright (c) Pragmatismo.io. All rights reserved.             |
| Licensed under the AGPL-3.0.                                                |
|                                                                             |
| According to our dual licensing model, this program can be used either      |
| under the terms of the GNU Affero General Public License, version 3,        |
| or under a proprietary license.                                             |
|                                                                             |
| The texts of the GNU Affero General Public License with an additional       |
| permission and of our proprietary license can be found at and               |
| in the LICENSE file you have received along with this program.              |
|                                                                             |
| This program is distributed in the hope that it will be useful,             |
| but WITHOUT ANY WARRANTY, without even the implied warranty of              |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                |
| GNU Affero General Public License for more details.                         |
|                                                                             |
| "General Bots" is a registered trademark of Pragmatismo.io.                 |
| The licensing of the program under the AGPLv3 does not imply a              |
| trademark license. Therefore any rights, title and interest in              |
| our trademarks remain entirely with us.                                     |
|                                                                             |
\*****************************************************************************/

/**
 * @fileoverview General Bots server core.
 */

'use strict';

const logger = require("../../../src/logger");
const Path = require("path");
const UrlJoin = require("url-join");
const Fs = require("fs");
const WaitUntil = require("wait-until");
const express = require("express");

import { KBService } from "./../../kb.gbapp/services/KBService";
import { GBImporter } from "./GBImporter";
import { IGBCoreService, IGBInstance } from "botlib";
import { GBConfigService } from "./GBConfigService";
import { GBError } from "botlib";
import { GuaribasPackage, GuaribasInstance } from "../models/GBModel";
import { IGBPackage } from "botlib";
import { AzureSearch } from "pragmatismo-io-framework";
import { AzureDeployerService } from "../../azuredeployer.gbapp/services/AzureDeployerService";

/** Deployer service for bots, themes, ai and more. */
export class GBDeployer {
  core: IGBCoreService;
  importer: GBImporter;
  workDir: string = "./work";
  static deployFolder = "packages";

  constructor(core: IGBCoreService, importer: GBImporter) {
    this.core = core;
    this.importer = importer;
  }

  /**
   *
   * Performs package deployment in all .gbai or default.
   *
   * */
  public deployPackages(
    core: IGBCoreService,
    server: any,
    appPackages: Array<IGBPackage>
  ) {
    let _this = this;
    return new Promise((resolve: any, reject: any): any => {
      let totalPackages = 0;
      let additionalPath = GBConfigService.get("ADDITIONAL_DEPLOY_PATH");
      let paths = [GBDeployer.deployFolder];
      if (additionalPath) {
        paths = paths.concat(additionalPath.toLowerCase().split(";"));
      }
      let botPackages = new Array<string>();
      let gbappPackages = new Array<string>();
      let generalPackages = new Array<string>();

      function doIt(path) {
        const isDirectory = source => Fs.lstatSync(source).isDirectory();
        const getDirectories = source =>
          Fs.readdirSync(source)
            .map(name => Path.join(source, name))
            .filter(isDirectory);

        let dirs = getDirectories(path);
        dirs.forEach(element => {
          if (element.startsWith(".")) {
            logger.info(`Ignoring ${element}...`);
          } else {
            if (element.endsWith(".gbot")) {
              botPackages.push(element);
            } else if (element.endsWith(".gbapp")) {
              gbappPackages.push(element);
            } else {
              generalPackages.push(element);
            }
          }
        });
      }

      logger.info(
        `Starting looking for packages (.gbot, .gbtheme, .gbkb, .gbapp)...`
      );
      paths.forEach(e => {
        logger.info(`Looking in: ${e}...`);
        doIt(e);
      });

      /** Deploys all .gbapp files first. */

      let appPackagesProcessed = 0;

      gbappPackages.forEach(e => {
        // Skips .gbapp inside deploy folder.
        if (!e.startsWith("packages")) {
          logger.info(`Deploying app: ${e}...`);
          import(e)
            .then(m => {
              let p = new m.Package();
              p.loadPackage(core, core.sequelize);
              appPackages.push(p);
              logger.info(`App (.gbapp) deployed: ${e}.`);
              appPackagesProcessed++;
            })
            .catch(err => {
              logger.error(`Error deploying App (.gbapp): ${e}: ${err}`);
              appPackagesProcessed++;
            });
        } else {
          appPackagesProcessed++;
        }
      });

      WaitUntil()
        .interval(1000)
        .times(10)
        .condition(function(cb) {
          logger.info(`Waiting for app package deployment...`);
          cb(appPackagesProcessed == gbappPackages.length);
        })
        .done(async result => {
          logger.info(`App Package deployment done.`);

          try {
            await core.syncDatabaseStructure();
          } catch (e) {
            throw e;
          }

          /** Deploys all .gbot files first. */

          botPackages.forEach(e => {
            logger.info(`Deploying bot: ${e}...`);
            _this.deployBot(e);
            logger.info(`Bot: ${e} deployed...`);
          });

          /** Then all remaining generalPackages are loaded. */

          generalPackages = generalPackages.filter(p => !p.endsWith(".git"));

          generalPackages.forEach(filename => {
            let filenameOnly = Path.basename(filename);
            logger.info(`Deploying package: ${filename}...`);

            /** Handles apps for general bots - .gbapp must stay out of deploy folder. */

            if (
              Path.extname(filename) === ".gbapp" ||
              Path.extname(filename) === ".gblib"
            ) {
              /** Themes for bots. */
            } else if (Path.extname(filename) === ".gbtheme") {
              server.use("/themes/" + filenameOnly, express.static(filename));
              logger.info(
                `Theme (.gbtheme) assets accessible at: ${"/themes/" +
                  filenameOnly}.`
              );

              /** Knowledge base for bots. */
            } else if (Path.extname(filename) === ".gbkb") {
              server.use(
                "/kb/" + filenameOnly + "/subjects",
                express.static(UrlJoin(filename, "subjects"))
              );
              logger.info(
                `KB (.gbkb) assets accessible at: ${"/kb/" + filenameOnly}.`
              );
            } else if (Path.extname(filename) === ".gbui") {
              // Already Handled
            } else {
              /** Unknown package format. */
              let err = new Error(`Package type not handled: ${filename}.`);
              reject(err);
            }
            totalPackages++;
          });

          WaitUntil()
            .interval(100)
            .times(5)
            .condition(function(cb) {
              logger.info(`Waiting for package deployment...`);
              cb(totalPackages == generalPackages.length);
            })
            .done(function(result) {
              if (botPackages.length === 0) {
                logger.warn(
                  "No external packages to load, please use ADDITIONAL_DEPLOY_PATH to point to a .gbai package folder."
                );
              } else {
                logger.info(`Package deployment done.`);
              }
              resolve();
            });
        });
    });
  }

  /**
   * Deploys a bot to the storage.
   */

  async deployBot(localPath: string): Promise<IGBInstance> {
    let packageType = Path.extname(localPath);
    let packageName = Path.basename(localPath);
    let instance = await this.importer.importIfNotExistsBotPackage(
      packageName,
      localPath
    );
    return instance;
  }

  async deployPackageToStorage(
    instanceId: number,
    packageName: string
  ): Promise<GuaribasPackage> {
    return GuaribasPackage.create({
      packageName: packageName,
      instanceId: instanceId
    });
  }

  deployTheme(localPath: string) {
    // DISABLED: Until completed, "/ui/public".
    // FsExtra.copy(localPath, this.workDir + packageName)
    //   .then(() => {
    //   })
    //   .catch(err => {
    //     var gberr = GBError.create(
    //       `GuaribasBusinessError: Error copying package: ${localPath}.`
    //     )
    //   })
  }

  async deployPackageFromLocalPath(localPath: string) {
    let packageType = Path.extname(localPath);

    switch (packageType) {
      case ".gbot":
        return this.deployBot(localPath);

      case ".gbtheme":
        return this.deployTheme(localPath);

      // PACKAGE: Put in package logic.
      case ".gbkb":
        let service = new KBService(this.core.sequelize);
        return service.deployKb(this.core, this, localPath);

      case ".gbui":
        break;

      default:
        var err = GBError.create(
          `GuaribasBusinessError: Unknow package type: ${packageType}.`
        );
        Promise.reject(err);
        break;
    }
  }

  async undeployPackageFromLocalPath(instance: IGBInstance, localPath: string) {
    let packageType = Path.extname(localPath);
    let packageName = Path.basename(localPath);

    let p = await this.getPackageByName(instance.instanceId, packageName);

    switch (packageType) {
      case ".gbot":
        // TODO: this.undeployBot(packageName, localPath)
        break;

      case ".gbtheme":
        // TODO: this.undeployTheme(packageName, localPath)
        break;

      case ".gbkb":
        let service = new KBService(this.core.sequelize);
        return service.undeployKbFromStorage(instance, this, p.packageId);

      case ".gbui":
        break;

      default:
        var err = GBError.create(
          `GuaribasBusinessError: Unknown package type: ${packageType}.`
        );
        Promise.reject(err);
        break;
    }
  }

  public static getConnectionStringFromInstance(instance: GuaribasInstance) {
    return `Server=tcp:${
      instance.storageServer
    }.database.windows.net,1433;Database=${instance.storageName};User ID=${
      instance.storageUsername
    };Password=${
      instance.storagePassword
    };Trusted_Connection=False;Encrypt=True;Connection Timeout=30;`;
  }

  public async rebuildIndex(instance: GuaribasInstance) {
    let search = new AzureSearch(
      instance.searchKey,
      instance.searchHost,
      instance.searchIndex,
      instance.searchIndexer
    );

    let connectionString = GBDeployer.getConnectionStringFromInstance(instance);

    const dsName = "gb";
    try {
      await search.deleteDataSource(dsName);
    } catch (err) {
      if (err.code != 404) {
        // First time, nothing to delete.
        throw err;
      }
    }

    await search.createDataSource(
      dsName,
      dsName,
      "GuaribasQuestion",
      "azuresql",
      connectionString
    );

    try {
      await search.deleteIndex();
    } catch (err) {
      if (err.code != 404) {
        // First time, nothing to delete.
        throw err;
      }
    }
    await search.createIndex(
      AzureDeployerService.getKBSearchSchema(instance.searchIndex),
      dsName
    );
  }

  async getPackageByName(
    instanceId: number,
    packageName: string
  ): Promise<GuaribasPackage> {
    var where = { packageName: packageName, instanceId: instanceId };
    return GuaribasPackage.findOne({
      where: where
    });
  }

  /**
   *
   * Hot deploy processing.
   *
   */
  async scanBootPackage() {
    const deployFolder = "packages";
    let bootPackage = GBConfigService.get("BOOT_PACKAGE");

    if (bootPackage === "none") {
      return Promise.resolve(true);
    } else {
      return this.deployPackageFromLocalPath(
        UrlJoin(deployFolder, bootPackage)
      );
    }
  }
}