name: Generate Contributor Certificate Preview

# This action triggers automatically when a pull request is closed,
# or can be run manually from the Actions tab.
on:
  pull_request_target:
    types: [closed]
    branches:
      - main
  workflow_dispatch:
    inputs:
      contributor_username:
        description: 'The GitHub username of the contributor'
        required: true
      pr_number:
        description: 'The pull request number'
        required: true

permissions: {}

jobs:
  screenshot_and_comment:
    # This job runs if the PR was merged or if it's a manual trigger.
    # The logic for first-time contributors is handled in a dedicated step below.
    if: ${{ github.event_name == 'workflow_dispatch' || github.event.pull_request.merged == true }}
    runs-on: ubuntu-latest
    permissions:
      contents: read  # Write access for certificate storage
      pull-requests: write  # Write access to comment on PRs
      actions: read  # Read access for workflow actions
    steps:
      # Step 1: Check if this is the contributor's first merged PR.
      # This step is the source of truth and will control the execution of subsequent steps.
      - name: Check for first merged PR
        id: check_first_pr
        if: ${{ github.event_name == 'pull_request' }}
        uses: actions/github-script@v8
        with:
          script: |
            const author = context.payload.pull_request.user.login;
            const query = `repo:${context.repo.owner}/${context.repo.repo} is:pr is:merged author:${author}`;

            console.log(`Searching for merged PRs from @${author} with query: "${query}"`);

            const result = await github.rest.search.issuesAndPullRequests({ q: query });
            const mergedPRs = result.data.total_count;

            if (mergedPRs === 1) {
              console.log(`SUCCESS: This is the first merged PR from @${author}. Proceeding...`);
              core.setOutput('is_first_pr', 'true');
            } else {
              console.log(`INFO: Skipping certificate generation. @${author} has ${mergedPRs} total merged PRs.`);
              core.setOutput('is_first_pr', 'false');
            }

      # Step 2: Checkout the repository containing the certificate HTML file.
      - name: Checkout containers/automation repository
        if: ${{ github.event_name == 'workflow_dispatch' || steps.check_first_pr.outputs.is_first_pr == 'true' }}
        uses: actions/checkout@v6
        with:
          repository: containers/automation
          path: automation-repo
          persist-credentials: false

      # Step 3: Update the HTML file locally
      - name: Update HTML file
        if: ${{ github.event_name == 'workflow_dispatch' || steps.check_first_pr.outputs.is_first_pr == 'true' }}
        env:
          CONTRIBUTOR_NAME: ${{ github.event.inputs.contributor_username || github.event.pull_request.user.login }}
          PR_NUMBER: ${{ github.event.inputs.pr_number || github.event.pull_request.number }}
        run: |
          HTML_FILE="automation-repo/certificate-generator/certificate_generator.html"
          MERGE_DATE=$(date -u +"%B %d, %Y")

          sed --sandbox -i -e "/id=\"contributorName\"/s/value=\"[^\"]*\"/value=\"${CONTRIBUTOR_NAME}\"/" ${HTML_FILE} || { echo "ERROR: Failed to update contributor name."; exit 1; }
          sed --sandbox -i -e "/id=\"prNumber\"/s/value=\"[^\"]*\"/value=\"#${PR_NUMBER}\"/" ${HTML_FILE} || { echo "ERROR: Failed to update PR number."; exit 1; }
          sed --sandbox -i -e "/id=\"mergeDate\"/s/value=\"[^\"]*\"/value=\"${MERGE_DATE}\"/" ${HTML_FILE} || { echo "ERROR: Failed to update merge date."; exit 1; }

      # Step 4: Setup Node.js environment
      - name: Setup Node.js
        if: ${{ github.event_name == 'workflow_dispatch' || steps.check_first_pr.outputs.is_first_pr == 'true' }}
        uses: actions/setup-node@v6
        with:
          node-version: latest

      # Step 5: Install Puppeteer
      - name: Install Puppeteer
        if: ${{ github.event_name == 'workflow_dispatch' || steps.check_first_pr.outputs.is_first_pr == 'true' }}
        run: |
          npm install puppeteer || { echo "ERROR: Failed to install Puppeteer."; exit 1; }

      # Step 6: Take a screenshot of the certificate div
      - name: Create and run screenshot script
        if: ${{ github.event_name == 'workflow_dispatch' || steps.check_first_pr.outputs.is_first_pr == 'true' }}
        run: |
          cat <<'EOF' > screenshot.js
          const puppeteer = require('puppeteer');
          const path = require('path');
          (async () => {
            const browser = await puppeteer.launch({ args: ['--no-sandbox', '--disable-setuid-sandbox'] });
            const page = await browser.newPage();
            const htmlPath = 'file://' + path.resolve('automation-repo/certificate-generator/certificate_generator.html');
            await page.goto(htmlPath, { waitUntil: 'networkidle0' });
            await page.setViewport({ width: 1080, height: 720 });
            const element = await page.$('#certificatePreview');
            if (!element) {
              console.error('Could not find element #certificatePreview.');
              process.exit(1);
            }
            await element.screenshot({ path: 'certificate.png' });
            await browser.close();
            console.log('Screenshot saved as certificate.png');
          })().catch(err => {
            console.error(err);
            process.exit(1);
          });
          EOF
          node screenshot.js || { echo "ERROR: Screenshot script failed."; exit 1; }

      # Step 7: Upload certificate image to separate repository
      - name: Upload certificate to separate repository
        if: ${{ github.event_name == 'workflow_dispatch' || steps.check_first_pr.outputs.is_first_pr == 'true' }}
        uses: actions/github-script@v8
        env:
          CONTRIBUTOR_USERNAME: ${{ github.event.inputs.contributor_username }}
          USER_LOGIN: ${{ github.event.pull_request.user.login }}
          PR_NUMBER: ${{ github.event.inputs.pr_number }}
        with:
          github-token: ${{ secrets.CERTIFICATES_REPO_TOKEN }}
          script: |
            const fs = require('fs');

            try {
              // Check if certificate.png exists
              if (!fs.existsSync('certificate.png')) {
                throw new Error('certificate.png not found!');
              }

              // Debug: Check token and repository access
              console.log('Testing repository access...');
              const certificatesOwner = process.env.CERTIFICATES_REPO_OWNER || context.repo.owner;
              const certificatesRepo = process.env.CERTIFICATES_REPO_NAME || 'automation';

              // Test repository access first
              try {
                await github.rest.repos.get({
                  owner: certificatesOwner,
                  repo: certificatesRepo
                });
                console.log(`✅ Repository access confirmed: ${certificatesOwner}/${certificatesRepo}`);
              } catch (accessError) {
                console.error(`❌ Repository access failed: ${accessError.message}`);
                throw new Error(`Cannot access repository ${certificatesOwner}/${certificatesRepo}. Check token permissions and repository existence.`);
              }

              // Read the certificate image
              const imageBuffer = fs.readFileSync('certificate.png');
              const base64Content = imageBuffer.toString('base64');

              console.log(`Certificate image size: ${imageBuffer.length} bytes`);

              // Create a unique filename with timestamp
              const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
              const contributorName = context.eventName === 'workflow_dispatch'
                ? process.env.CONTRIBUTOR_USERNAME
                : process.env.USER_LOGIN;
              const prNumber = context.eventName === 'workflow_dispatch'
                ? process.env.PR_NUMBER
                : context.issue.number;

              const filename = `certificates/${contributorName}-${prNumber}-${timestamp}.png`;

              // Configuration for the certificates repository
              const certificatesBranch = process.env.CERTIFICATES_REPO_BRANCH || 'main';

              console.log(`Uploading to repository: ${certificatesOwner}/${certificatesRepo}`);
              console.log(`File path: ${filename}`);
              console.log(`Branch: ${certificatesBranch}`);

              // Upload the file to the certificates repository
              await github.rest.repos.createOrUpdateFileContents({
                owner: certificatesOwner,
                repo: certificatesRepo,
                path: filename,
                message: `Add certificate for ${contributorName} from ${context.repo.owner}/${context.repo.repo} (PR #${prNumber})\n\nSigned-off-by: Podman Bot <podman.bot@example.com>`,
                content: base64Content,
                branch: certificatesBranch,
                author: {
                  name: 'Podman Bot',
                  email: 'podman.bot@example.com'
                },
                committer: {
                  name: 'Podman Bot',
                  email: 'podman.bot@example.com'
                }
              });

              // Create the image URL
              const imageUrl = `https://github.com/${certificatesOwner}/${certificatesRepo}/raw/${certificatesBranch}/${filename}`;

              console.log(`Certificate uploaded successfully: ${imageUrl}`);

              // Store the image URL for the comment step
              core.exportVariable('CERTIFICATE_IMAGE_URL', imageUrl);
              core.exportVariable('CERTIFICATE_UPLOADED', 'true');

            } catch (error) {
              console.error('Failed to upload certificate:', error);
              console.error('Error details:', error.message);

              // Provide helpful error message if it's likely a permissions issue
              let errorMsg = error.message;
              if (error.status === 404) {
                errorMsg += ' (Repository not found - check CERTIFICATES_REPO_OWNER and CERTIFICATES_REPO_NAME environment variables, or ensure the automation repository exists and the token has access)';
              } else if (error.status === 403) {
                errorMsg += ' (Permission denied - check that CERTIFICATES_REPO_TOKEN has write access to the automation repository)';
              }

              core.exportVariable('CERTIFICATE_UPLOADED', 'false');
              core.exportVariable('UPLOAD_ERROR', errorMsg);
            }

      # Step 8: Comment on Pull Request with embedded image
      - name: Comment with embedded certificate image
        if: ${{ github.event_name == 'workflow_dispatch' || steps.check_first_pr.outputs.is_first_pr == 'true' }}
        uses: actions/github-script@v8
        env:
          CONTRIBUTOR_USERNAME: ${{ github.event.inputs.contributor_username }}
          USER_LOGIN: ${{ github.event.pull_request.user.login }}
          PR_NUMBER: ${{ github.event.inputs.pr_number }}
        with:
          script: |
            try {
              let body;

              // Check if certificate was uploaded successfully
              if (process.env.CERTIFICATE_UPLOADED === 'true') {
                const imageUrl = process.env.CERTIFICATE_IMAGE_URL;
                console.log(`Using uploaded certificate image: ${imageUrl}`);

                // Create the image content with the uploaded image URL
                const imageContent = `![Certificate Preview](${imageUrl})`;
                body = imageContent;
              } else {
                console.log('Certificate upload failed, providing fallback message');
                const errorMsg = process.env.UPLOAD_ERROR || 'Unknown error';
                body = `📜 **Certificate Preview**\n\n_Certificate generation completed, but there was an issue uploading the image: ${errorMsg}_\n\nPlease check the workflow logs for more details.`;
              }

              if (context.eventName === 'workflow_dispatch') {
                // Manual trigger case
                const contributorName = process.env.CONTRIBUTOR_USERNAME;
                const prNumber = process.env.PR_NUMBER;
                body = `📜 Certificate preview generated for @${contributorName} (PR #${prNumber}):\n\n${body}`;
              } else {
                // Auto trigger case for first-time contributors
                const username = process.env.USER_LOGIN;
                body = `🎉 Congratulations on your first merged pull request, @${username}! Thank you for your contribution.\n\nHere's a preview of your certificate:\n\n${body}`;
              }

              const issueNumber = context.eventName === 'workflow_dispatch' ?
                parseInt(process.env.PR_NUMBER) :
                context.issue.number;

              await github.rest.issues.createComment({
                issue_number: issueNumber,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: body,
              });
            } catch (error) {
              core.setFailed(`ERROR: Failed to comment on PR. Details: ${error.message}`);
            }

      # Step 9: Clean up temporary files
      - name: Clean up temporary files
        if: ${{ always() && (github.event_name == 'workflow_dispatch' || steps.check_first_pr.outputs.is_first_pr == 'true') }}
        run: |
          rm -f certificate.png