//-- copyright
// OpenProject is an open source project management software.
// Copyright (C) the OpenProject GmbH
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License version 3.
//
// OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
// Copyright (C) 2006-2013 Jean-Philippe Lang
// Copyright (C) 2010-2013 the ChiliProject Team
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
// See COPYRIGHT and LICENSE files for more details.
//++    Ng1FieldControlsWrapper,

import { ChangeDetectionStrategy, Component, ElementRef, Injector, Input, OnInit, inject } from '@angular/core';
import {
  HalResourceEditingService
} from 'core-app/shared/components/fields/edit/services/hal-resource-editing.service';
import { populateInputsFromDataset } from 'core-app/shared/components/dataset-inputs';
import { IGithubPullRequest, IGithubUserResource } from '../state/github-pull-request.model';
import { GithubPullRequestResourceService } from '../state/github-pull-request.service';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';
import { I18nService } from 'core-app/core/i18n/i18n.service';
import { PullRequestState } from './pull-request-state.component';

@Component({
  templateUrl: './pull-request-macro.component.html',
  styleUrls: ['./pull-request-macro.component.sass'],
  changeDetection: ChangeDetectionStrategy.OnPush,
  providers: [
    HalResourceEditingService,
  ],
  standalone: false,
})
export class PullRequestMacroComponent implements OnInit {
  readonly elementRef = inject(ElementRef);
  readonly injector = inject(Injector);
  readonly pullRequests = inject(GithubPullRequestResourceService);
  readonly I18n = inject(I18nService);

  @Input() pullRequestId:string;

  @Input() pullRequestState:PullRequestState;

  pullRequest$:Observable<IGithubPullRequest>;

  displayText$:Observable<string|null>;

  constructor() {
    populateInputsFromDataset(this);
  }

  ngOnInit() {
    this.pullRequest$ = this
      .pullRequests
      .requireSingle(this.pullRequestId);

    this.displayText$ = this
      .pullRequest$
      .pipe(
        map((pr) => this.buildText(pr)),
      );
  }

  private buildText(pr:IGithubPullRequest):string|null {
    const actor = this.deriveActor(pr) as IGithubUserResource;
    if (!actor) {
      return null;
    }


    const actorLink = this.htmlLink(actor.htmlUrl, actor.login);
    const repositoryLink = this.htmlLink(pr.repositoryHtmlUrl, pr.repository);
    const prLink = this.htmlLink(pr.htmlUrl, pr.title);

    const message = this.deriveMessage();
    return this.I18n.t(
      `js.github_integration.pull_requests.${message}`,
      {
        pr_number: pr.number,
        pr_link: prLink,
        repository_link: repositoryLink,
        pr_state: this.I18n.t(
          `js.github_integration.pull_requests.states.${this.pullRequestState}`,
          { defaultValue: this.pullRequestState || '(unknown state)' },
        ),
        github_user_link: actorLink,
      },
    );
  }


  private deriveActor(pr:IGithubPullRequest) {
    if (this.pullRequestState === 'merged') {
      return pr._embedded.mergedBy;
    } else {
      return pr._embedded.githubUser;
    }
  }

  private deriveMessage() {
    if (this.pullRequestState === 'referenced') {
      return 'referenced_message';
    } else if (this.pullRequestState === 'merged') {
      return 'merged_message';
    }

    return 'message';
  }

  private htmlLink(href:string, title:string):string {
    const link = document.createElement('a');
    link.href = href;
    link.textContent = title;

    return link.outerHTML;
  }
}