/**
 * Copyright (c) Microsoft Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file 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.
 */

import { context, getOctokit } from '@actions/github';
import * as core from '@actions/core';

import MarkdownReporter from './markdownReporter';

import type { MetadataWithCommitInfo } from 'playwright/src/isomorphic/types';

function getGithubToken() {
  const token = process.env.GITHUB_TOKEN || core.getInput('github-token');
  if (!token) {
    core.setFailed('Missing "github-token" input');
    throw new Error('Missing "github-token" input');
  }
  return token;
}

const octokit = getOctokit(getGithubToken());

const magicComment = '<!-- Generated by Playwright markdown reporter -->';

class GHAMarkdownReporter extends MarkdownReporter {
  override async publishReport(report: string) {
    core.info('Publishing report to PR.');
    const { prNumber, prHref } = this.pullRequestFromMetadata();
    if (!prNumber) {
      core.info(`No PR number found, skipping GHA comment. PR href: ${prHref}`);
      return;
    }
    core.info(`Posting comment to PR ${prHref}`);

    await this.collapsePreviousComments(prNumber);
    await this.addNewReportComment(prNumber, report);
  }

  private async collapsePreviousComments(prNumber: number) {
    const { data: comments } = await octokit.rest.issues.listComments({
      ...context.repo,
      issue_number: prNumber,
    });
    for (const comment of comments) {
      if (comment.user?.login === 'github-actions[bot]' && comment.body?.includes(magicComment)) {
        core.info(`Minimizing comment: ${comment.html_url}`);
        await octokit.graphql(`
          mutation {
            minimizeComment(input: {subjectId: "${comment.node_id}", classifier: OUTDATED}) {
              clientMutationId
            }
          }
        `);
      }
    }
  }

  private async addNewReportComment(prNumber: number, report: string) {
    const reportUrl = process.env.HTML_REPORT_URL;
    const mergeWorkflowUrl = `${context.serverUrl}/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}`;

    const { data: response } = await octokit.rest.issues.createComment({
      ...context.repo,
      issue_number: prNumber,
      body: formatComment([
        magicComment,
        `### [Test results](${reportUrl}) for "${context.payload.workflow_run?.name}"`,
        report,
        '',
        `Merge [workflow run](${mergeWorkflowUrl}).`
      ]),
    });
    core.info(`Posted comment:  ${response.html_url}`);
  }

  private pullRequestFromMetadata() {
    const metadata = this._config.metadata as MetadataWithCommitInfo;
    const prHref = metadata.ci?.prHref;
    return { prNumber: parseInt(prHref?.split('/').pop() ?? '', 10), prHref };
  }
}

function formatComment(lines: string[]) {
  let body = lines.join('\n');
  if (body.length > 65535)
    body = body.substring(0, 65000) + `... ${body.length - 65000} more characters`;
  return body;
}

export default GHAMarkdownReporter;