/*-
 * ============LICENSE_START==========================================
 * ONAP Portal
 * ===================================================================
 * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
 * ===================================================================
 *
 * Unless otherwise specified, all software contained herein is licensed
 * under the Apache License, Version 2.0 (the "License");
 * you may not use this software except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *             http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Unless otherwise specified, all documentation contained herein is licensed
 * under the Creative Commons License, Attribution 4.0 Intl. (the "License");
 * you may not use this documentation except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *             https://creativecommons.org/licenses/by/4.0/
 *
 * Unless required by applicable law or agreed to in writing, documentation
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * ============LICENSE_END============================================
 *
 * 
 */
 
import { Injectable, NgModuleFactory } from '@angular/core';
import { PluginLoaderService } from './plugin-loader.service';
import { PLUGIN_EXTERNALS_MAP } from './plugin-externals';
import { PluginsConfigProvider } from '../plugins-config.provider';

const SystemJs = window.System;

@Injectable({
  providedIn: 'root',
})
export class ClientPluginLoaderService extends PluginLoaderService {
  constructor(private configProvider: PluginsConfigProvider) {
    super();
    configProvider.loadConfig()
    .toPromise()
    .then(config => {
      configProvider.config = config;
      console.log(config);
    });
  }

  provideExternals() {
    Object.keys(PLUGIN_EXTERNALS_MAP).forEach(externalKey =>
      window.define(externalKey, [], () => PLUGIN_EXTERNALS_MAP[externalKey])
    );
  }

  load<T>(pluginName): Promise<NgModuleFactory<T>> {

    const { config } = this.configProvider;
    if (!config[pluginName]) {
      throw Error(`Can't find appropriate plugin`);
    }

    const depsPromises = (config[pluginName].deps || []).map(dep => {
      return SystemJs.import(window['base'] + config[dep].path).then(m => {
        window['define'](dep, [], () => m.default);
      });
    });

    return Promise.all(depsPromises).then(() => {

      return SystemJs.import(window['base'] + config[pluginName].path).then(
        module => module.default.default
      );
    });
  }
}