name: Dead Domains Check

env:
  NODE_VERSION: 20

on:
  schedule:
    # Run the job on every Monday at 8:00 AM UTC
    - cron: '0 8 * * 1'
  push:
    branches:
      - master
    paths:
      - '.github/workflows/dead-domains-check.yml'
  workflow_dispatch:

jobs:
  dead-domains-check:
    name: Run dead domains check
    runs-on: ubuntu-latest
    steps:
      - name: Check out to repository
        uses: actions/checkout@v4

      - name: Install pnpm
        uses: pnpm/action-setup@v4

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: pnpm

      - name: Install dependencies
        run: pnpm install

      - name: Export dead domains to a file
        run: pnpm dead-domains-linter --export dead-domains.txt

      - name: Read dead domains from the file
        id: read-dead-domains
        uses: actions/github-script@v7
        with:
          script: |
            const { readFile } = require('fs').promises;

            const deadDomains = (await readFile('dead-domains.txt', 'utf8'))
              .split(/\r?\n/)
              .filter(Boolean);

            // Add warning to the console
            for (const domain of deadDomains) {
              core.warning(`Possible dead domain: ${domain}`);
            }

            core.setOutput('has_dead_domains', deadDomains.length > 0 ? 'true' : 'false');
            core.setOutput('dead_domains', deadDomains);

      - name: Close previous issue(s)
        uses: actions/github-script@v7
        with:
          script: |
            const title = 'Automated dead domains report';

            // Close previous issues which have the same title and opened by github-actions[bot]
            const { data: issues } = await github.rest.issues.listForRepo({
              owner: context.repo.owner,
              repo: context.repo.repo,
              state: 'open',
            });

            const previousIssues = issues.filter(issue => {
              const isBot = issue.user.login === 'github-actions[bot]';

              return issue.title === title && isBot;
            });

            for (const previousIssue of previousIssues) {
              await github.rest.issues.update({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: previousIssue.number,
                state: 'closed',
              });

              core.info(`Closed previous issue #${previousIssue.number}`);
            }

      - name: Close previous pull request(s)
        uses: actions/github-script@v7
        with:
          script: |
            // Close previous pull requests which have the branch name 'fix/dead-domains-<number>'
            // and opened by github-actions[bot]
            const { data: pullRequests } = await github.rest.pulls.list({
              owner: context.repo.owner,
              repo: context.repo.repo,
              state: 'open',
            });

            const previousPullRequests = pullRequests.filter(pullRequest => {
              const branchName = pullRequest.head.ref;
              const isAutomatedFix = branchName.startsWith('fix/dead-domains-');
              const isBot = pullRequest.user.login === 'github-actions[bot]';

              return isAutomatedFix && isBot;
            });

            for (const previousPullRequest of previousPullRequests) {
              await github.rest.pulls.update({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: previousPullRequest.number,
                state: 'closed',
              });

              core.info(`Closed previous pull request #${previousPullRequest.number}`);
            }

            // Delete the branch of the closed pull requests
            for (const previousPullRequest of previousPullRequests) {
              await github.rest.git.deleteRef({
                owner: context.repo.owner,
                repo: context.repo.repo,
                ref: `heads/${previousPullRequest.head.ref}`,
              });

              core.info(`Deleted branch ${previousPullRequest.head.ref}`);
            }

      - name: Open an issue if there are dead domains
        if: steps.read-dead-domains.outputs.has_dead_domains == 'true'
        id: open-issue
        uses: actions/github-script@v7
        with:
          script: |
            const deadDomains = JSON.parse(${{ toJson(steps.read-dead-domains.outputs.dead_domains) }});
            const title = 'Automated dead domains report';

            const { data: issue } = await github.rest.issues.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              title,
              body: [
                'The following domains are possibly dead:',
                '',
                '<details>',
                '<summary>Click to expand</summary>',
                '',
                `${deadDomains.map(domain => `- ${domain}`).join('\n')}`,
                '',
                '</details>',
                '',
                'Please note that this is an automated report and some low-traffic websites may be incorrectly marked as dead.',
                'For more information, see https://github.com/AdguardTeam/DeadDomainsLinter/blob/master/README.md',
              ].join('\n'),
              labels: ['dead website'],
            });

            core.setOutput('issue_number', issue.number);
            core.info(`Issue #${issue.number} opened (${title})`);

      - name: Create a new branch for the automated fix
        if: steps.read-dead-domains.outputs.has_dead_domains == 'true'
        id: create-branch
        run: |
          branch_name="fix/dead-domains-${{ steps.open-issue.outputs.issue_number }}"
          git checkout -b $branch_name

          echo "branch_name=$branch_name" >> $GITHUB_OUTPUT

      - name: Perform the automated fix
        if: steps.read-dead-domains.outputs.has_dead_domains == 'true'
        run: |
          pnpm dead-domains-linter --auto --import dead-domains.txt

      - name: Stage changes for the automated fix
        if: steps.read-dead-domains.outputs.has_dead_domains == 'true'
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

          # Add "dead-domains.txt" to the .gitignore if it's not there
          if ! grep -q "dead-domains.txt" .gitignore; then
            echo "dead-domains.txt" >> .gitignore
          fi

          git add -A

      - name: Commit and push the automated fix
        if: steps.read-dead-domains.outputs.has_dead_domains == 'true'
        run: |
          git commit -m "Automated dead domains fix (#${{ steps.open-issue.outputs.issue_number }})"
          git push --set-upstream origin ${{ steps.create-branch.outputs.branch_name }}

      - name: Create a pull request for the automated fix
        if: steps.read-dead-domains.outputs.has_dead_domains == 'true'
        uses: actions/github-script@v7
        with:
          script: |
            const { data: pullRequest } = await github.rest.pulls.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              title: 'Automated dead domains fix',
              head: '${{ steps.create-branch.outputs.branch_name }}',
              base: context.ref.replace('refs/heads/', ''),
              body: [
                'This is an automated pull request to fix #${{ steps.open-issue.outputs.issue_number }}.',
                '',
                'Please note that this is an automated fix and some low-traffic websites may be incorrectly marked as dead.',
                'For more information, see https://github.com/AdguardTeam/DeadDomainsLinter/blob/master/README.md',
              ].join('\n'),
            });

            core.info(`Pull request #${pullRequest.number} opened`);

            // Add labels to the pull request
            await github.rest.issues.addLabels({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: pullRequest.number,
              labels: ['dead website'],
            });