action.yml

name: "Preview Changes"
description: "Runs dry-run command and posts diff as a GitHub comment"

inputs:
  version:
    description: "Release version to preview"
    required: true
  environment:
    description: "Environment name"
    required: true
  installation:
    description: "Installation name"
    required: true
  ryvn_client_id:
    description: "Ryvn Client ID for authentication"
    required: true
  ryvn_client_secret:
    description: "Ryvn Client Secret for authentication"
    required: true
  github_token:
    description: "GitHub token for posting comments"
    required: true
  timeout:
    description: "Timeout for watching task (e.g., 10m, 30s)"
    required: false
    default: "10m"

runs:
  using: "composite"
  steps:
    - name: Install Ryvn CLI
      uses: ryvn-technologies/install-ryvn-cli@v1.0.0

    - name: Run Dry-Run Command
      id: dryrun
      shell: bash
      env:
        RYVN_CLIENT_ID: ${{ inputs.ryvn_client_id }}
        RYVN_CLIENT_SECRET: ${{ inputs.ryvn_client_secret }}
      run: |
        set +e  # Don't exit on error, capture exit code

        # Build dry-run command with JSON output and watching
        cmd="ryvn run command dry-run -e ${{ inputs.environment }} -i ${{ inputs.installation }} --version ${{ inputs.version }} --output json --timeout ${{ inputs.timeout }}"

        echo "Executing: $cmd"

        # Run command and capture output
        output_file=$(mktemp)
        $cmd > "$output_file" 2>&1
        exit_code=$?

        # Read output
        output=$(cat "$output_file")
        rm "$output_file"

        echo "Exit code: $exit_code"

        # Save raw output
        echo "$output" > dry-run-output.json

        # Parse JSON output
        if echo "$output" | jq . > /dev/null 2>&1; then
          # Valid JSON
          status=$(echo "$output" | jq -r '.status // "UNKNOWN"')
          duration=$(echo "$output" | jq -r '.duration // "unknown"')
          task_id=$(echo "$output" | jq -r '.taskId // ""')

          echo "status=$status" >> $GITHUB_OUTPUT
          echo "duration=$duration" >> $GITHUB_OUTPUT
          echo "task_id=$task_id" >> $GITHUB_OUTPUT

          # Extract logs
          logs=$(echo "$output" | jq -r '.logs // []')
          log_count=$(echo "$logs" | jq 'length')

          if [ "$log_count" -gt 0 ]; then
            # Combine all log messages (keep ANSI codes)
            diff_output=$(echo "$logs" | jq -r '.[].message')

            # Save to file
            echo "$diff_output" > diff-output.txt

            # Check size and truncate if needed
            char_count=$(echo "$diff_output" | wc -c)
            if [ "$char_count" -gt 60000 ]; then
              echo "$diff_output" | head -c 60000 > diff-output-truncated.txt
              echo "" >> diff-output-truncated.txt
              echo "... (output truncated, total size: $char_count characters)" >> diff-output-truncated.txt
              echo "is_truncated=true" >> $GITHUB_OUTPUT
            else
              cp diff-output.txt diff-output-truncated.txt
              echo "is_truncated=false" >> $GITHUB_OUTPUT
            fi
          else
            echo "No changes detected" > diff-output-truncated.txt
            echo "is_truncated=false" >> $GITHUB_OUTPUT
          fi

          # Check if task completed successfully
          if [ "$status" = "COMPLETED" ]; then
            echo "has_error=false" >> $GITHUB_OUTPUT
          else
            echo "has_error=true" >> $GITHUB_OUTPUT
          fi
        else
          # Not valid JSON, likely an error
          echo "has_error=true" >> $GITHUB_OUTPUT
          echo "status=ERROR" >> $GITHUB_OUTPUT
          echo "duration=unknown" >> $GITHUB_OUTPUT
          echo "$output" > diff-output-truncated.txt
          echo "is_truncated=false" >> $GITHUB_OUTPUT
        fi

    - name: Create GitHub Comment
      uses: actions/github-script@v7
      with:
        github-token: ${{ inputs.github_token }}
        script: |
          const fs = require('fs');

          // Read diff output
          const diffOutput = fs.readFileSync('diff-output-truncated.txt', 'utf8');

          // Determine status
          const hasError = '${{ steps.dryrun.outputs.has_error }}' === 'true';
          const status = '${{ steps.dryrun.outputs.status }}';
          const duration = '${{ steps.dryrun.outputs.duration }}';
          const isTruncated = '${{ steps.dryrun.outputs.is_truncated }}' === 'true';

          let statusIcon;
          if (hasError) {
            statusIcon = status === 'CANCELLED' ? '⚠️' : '❌';
          } else {
            statusIcon = '✅';
          }

          // Build comment body
          let body = `${statusIcon} Preview changes for installation \`${{ inputs.installation }}\` in environment \`${{ inputs.environment }}\` using version \`${{ inputs.version }}\` (${duration})\n\n`;

          if (isTruncated) {
            const dashboardLink = `https://control.ryvn.app/environments/${{ inputs.environment }}/installations/${{ inputs.installation }}`;
            body += `> **Note**: Output was truncated due to size. View full output in [Ryvn Dashboard](${dashboardLink}).\n\n`;
          }

          // Use ANSI code block for colored output
          body += '```ansi\n';
          body += diffOutput;
          body += '\n```\n';

          body += `\n<sub>Preview for commit ${context.sha.substring(0, 7)}</sub>`;

          // Create comment
          await github.rest.issues.createComment({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: context.issue.number,
            body: body
          });
          console.log('Created new comment');

          // Clean up
          fs.unlinkSync('diff-output-truncated.txt');
          if (fs.existsSync('diff-output.txt')) {
            fs.unlinkSync('diff-output.txt');
          }
          if (fs.existsSync('dry-run-output.json')) {
            fs.unlinkSync('dry-run-output.json');
          }

branding:
  icon: "eye"
  color: "purple"