/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {HtmlParser as BaseHtmlParser} from '../ml_parser/html_parser';
import {DEFAULT_INTERPOLATION_CONFIG, InterpolationConfig} from '../ml_parser/interpolation_config';
import {ParseTreeResult} from '../ml_parser/parser';

import {mergeTranslations} from './extractor_merger';
import {MessageBundle} from './message_bundle';
import {Xtb} from './serializers/xtb';
import {TranslationBundle} from './translation_bundle';

export class HtmlParser implements BaseHtmlParser {
  // @override
  public getTagDefinition: any;

  // TODO(vicb): transB.load() should not need a msgB & add transB.resolve(msgB,
  // interpolationConfig)
  // TODO(vicb): remove the interpolationConfig from the Xtb serializer
  constructor(private _htmlParser: BaseHtmlParser, private _translations?: string) {}

  parse(
      source: string, url: string, parseExpansionForms: boolean = false,
      interpolationConfig: InterpolationConfig = DEFAULT_INTERPOLATION_CONFIG): ParseTreeResult {
    const parseResult =
        this._htmlParser.parse(source, url, parseExpansionForms, interpolationConfig);

    if (!this._translations || this._translations === '') {
      // Do not enable i18n when no translation bundle is provided
      return parseResult;
    }

    // TODO(vicb): add support for implicit tags / attributes
    const messageBundle = new MessageBundle(this._htmlParser, [], {});
    const errors = messageBundle.updateFromTemplate(source, url, interpolationConfig);

    if (errors && errors.length) {
      return new ParseTreeResult(parseResult.rootNodes, parseResult.errors.concat(errors));
    }

    const xtb = new Xtb(this._htmlParser, interpolationConfig);
    const translationBundle = TranslationBundle.load(this._translations, url, messageBundle, xtb);

    const translatedNodes =
        mergeTranslations(parseResult.rootNodes, translationBundle, interpolationConfig, [], {});

    return new ParseTreeResult(translatedNodes, []);
  }
}