post-merge.yml

name: Post-Merge Processing

on:
  push:
    branches:
      - main

jobs:
  process_merge:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: read

    steps:
      - name: Checkout Repository
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Set up Git Safe Directory
        run: |
          git config --global --add safe.directory $GITHUB_WORKSPACE
  


      - name: Set up Git user
        run: |
          git config user.name "GitHub Action"
          git config user.email "action@github.com"

      - name: Set up Python 3.x
        uses: actions/setup-python@v4
        with:
          python-version: '3.x'

      - name: Install dependencies
        run: |
          pip install boto3

      - name: Check if Latest Commit is a Merge Commit
        id: check_merge
        run: |
          PARENT_COUNT=$(git show -s --format=%P HEAD | wc -w)
          echo "Parent count: $PARENT_COUNT"
          if [ "$PARENT_COUNT" -gt 1 ]; then
            echo "is_merge=true" >> $GITHUB_OUTPUT
          else
            echo "is_merge=false" >> $GITHUB_OUTPUT
          fi

      - name: Show HEAD Commit Details
        run: |
          git show --no-patch --format=fuller HEAD

      - name: Get Associated Pull Request
        if: steps.check_merge.outputs.is_merge == 'true'
        id: get_pr
        uses: actions/github-script@v6
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const commit_sha = '${{ github.sha }}';
            const prs = await github.rest.repos.listPullRequestsAssociatedWithCommit({
              owner: context.repo.owner,
              repo: context.repo.repo,
              commit_sha: commit_sha,
            });
            if (prs.data.length > 0) {
              const pr = prs.data[0];
              core.setOutput('pr_number', pr.number.toString());
              core.setOutput('pr_body', pr.body || '');
            } else {
              core.setFailed('No pull request found for this commit.');
              core.setOutput('pr_number', '');
              core.setOutput('pr_body', '');
            }

      - name: Parse Pull Request Description
        if: steps.get_pr.outputs.pr_number != ''
        uses: actions/github-script@v6
        id: parse_pr
        with:
          script: |
            const prBody = process.env.PR_BODY;
        
            const filenameMatch = prBody.match(/^Filename:\s*(.+)$/m);
            const nameMatch = prBody.match(/^Name:\s*(.+)$/m);
            const categoryMatch = prBody.match(/^Category:\s*(.+)$/m);

            if (!filenameMatch) throw new Error('Filename not found or invalid in PR description.');
            if (!nameMatch) throw new Error('Name not found or invalid in PR description.');
            if (!categoryMatch) throw new Error('Category not found or invalid in PR description.');
        
            core.setOutput('filename', filenameMatch[1].trim());
            core.setOutput('title', nameMatch[1].trim());
            core.setOutput('category', categoryMatch[1].trim());
        env:
            PR_BODY: ${{ steps.get_pr.outputs.pr_body }}

      - name: Ensure Scripts are Executable
        if: steps.get_pr.outputs.pr_number != ''
        run: |
          chmod +x ./append_floppy ./calc_crc32 ./upload_image
            
      - name: Calculate CRC32 of the floppy image
        if: steps.get_pr.outputs.pr_number != ''
        id: calculate_crc32
        run: |
          # Run the CRC32 calculation and capture the output
          crc32_value=$(./calc_crc32 "${{ steps.parse_pr.outputs.filename }}")
      
          # Save the CRC32 value to an environment variable for further use
          echo "crc32_value=$crc32_value" >> $GITHUB_ENV
        
    
      - name: Update the database
        if: steps.get_pr.outputs.pr_number != ''
        run: |
          ./append_floppy "${{ steps.parse_pr.outputs.title }}" "${{ env.crc32_value }}" "${{ steps.parse_pr.outputs.category }}"
        env:
          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}

      - name: Upload the image if it does not exist
        if: (steps.get_pr.outputs.pr_number != '') && (env.crc32_value == steps.parse_pr.outputs.filename)
        run: |
          ./upload_image "${{ steps.parse_pr.outputs.filename }}" "MISC"
        env:
          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
  
      - name: Delete the Floppy Image and remove it from the repository
        if: steps.get_pr.outputs.pr_number != ''
        run: |
            rm "${{ steps.parse_pr.outputs.filename }}"
            git rm "${{ steps.parse_pr.outputs.filename }}"
            git add images_crc32.csv
            git add images.log
            git commit -m "Add ${{steps.parse_pr.outputs.title}}"
            git push
  
      - name: Notify Maintainers
        if: failure() && steps.get_pr.outputs.pr_number != ''
        uses: actions/github-script@v6
        with:
            github-token: ${{ secrets.GITHUB_TOKEN }}
            script: |
              const issueNumber = parseInt('${{ steps.get_pr.outputs.pr_number }}');
        
              github.issues.createComment({
                issue_number: issueNumber,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: 'An error occurred while processing your Floppy image submission. Please check the repository logs for more details.'
              });