/**
 * 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 '../../packages/playwright/src/reporters/markdown';

import type { MetadataWithCommitInfo } from 'playwright/src/isomorphic/types';
import type { IssueCommentEdge, Repository } from '@octokit/graphql-schema';

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());

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}`);

    const prNodeId = await this.collapsePreviousComments(prNumber);
    if (!prNodeId) {
      core.warning(`No PR node ID found, skipping GHA comment. PR href: ${prHref}`);
      return;
    }
    await this.addNewReportComment(prNodeId, report);
  }

  private async collapsePreviousComments(prNumber: number) {
    const { owner, repo } = context.repo;
    const data = await octokit.graphql<{ repository: Repository }>(`
      query {
        repository(owner: "${owner}", name: "${repo}") {
          pullRequest(number: ${prNumber}) {
            id
            comments(last: 100) {
              nodes {
                id
                body
                author {
                  __typename
                  login
                }
              }
            }
          }
        }
      }
    `);
    const comments = data.repository.pullRequest?.comments.nodes?.filter(comment =>
      comment?.author?.__typename === 'Bot' &&
      comment?.author?.login === 'github-actions' &&
      comment.body?.includes(this._magicComment()));
    const prId = data.repository.pullRequest?.id;
    if (!comments?.length)
      return prId;
    const mutations = comments.map((comment, i) =>
      `m${i}: minimizeComment(input: { subjectId: "${comment!.id}", classifier: OUTDATED }) { clientMutationId }`);
    await octokit.graphql(`
      mutation {
        ${mutations.join('\n')}
      }
    `);
    return prId;
  }

  private _magicComment() {
    return `<!-- Generated by Playwright markdown reporter for ${this._workflowRunName()} in job ${process.env.GITHUB_JOB} -->`;
  }

  private _workflowRunName() {
    // When used via 'workflow_run' event.
    const workflowRunName = context.payload.workflow_run?.name;
    if (workflowRunName)
      return workflowRunName;
    // When used via 'pull_request'/'push' event.
    // This is the name of the workflow file, e.g. 'ci.yml' or name if set.
    return process.env.GITHUB_WORKFLOW;
  }

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

    const body = formatComment([
      this._magicComment(),
      `### ${reportUrl ? `[Test results](${reportUrl})` : 'Test results'} for "${this._workflowRunName()}"`,
      report,
      '',
      `Merge [workflow run](${mergeWorkflowUrl}).`
    ]);

    const response = await octokit.graphql<{ addComment: { commentEdge: IssueCommentEdge } }>(`
      mutation {
        addComment(input: {subjectId: "${prNodeId}", body: """${body}"""}) {
          commentEdge {
            node {
              ... on IssueComment {
                url
              }
            }
          }
        }
      }
    `);
    core.info(`Posted comment:  ${response.addComment.commentEdge.node?.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;