name: 'Auto-update README'

on:
  push:
    branches: [ "main" ]
    paths:
      - 'k8s/**'
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write

jobs:
  update-readme:
    name: 'Generate README and Create MR'
    runs-on: ubuntu-latest

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

    - name: Configure Git
      run: |
        git config --global user.name "Gitea Actions Bot"
        git config --global user.email "actions@gitea.local"

    - name: Generate README
      run: |
        echo "📋 Starting README generation..."
        python3 .gitea/scripts/generate-readme.py k8s/ README.md

        if [ -f "README.md" ]; then
          echo "✅ README generated successfully"
          echo "📄 File size: $(wc -c < README.md) bytes"
          echo "📄 Lines: $(wc -l < README.md)"
        else
          echo "❌ README not generated"
          exit 1
        fi

    - name: Check for changes
      id: check_changes
      run: |
        if git diff --quiet README.md; then
          echo "No changes detected in README.md"
          echo "has_changes=false" >> $GITHUB_OUTPUT
        else
          echo "Changes detected in README.md"
          echo "has_changes=true" >> $GITHUB_OUTPUT
        fi

    - name: Create Pull Request
      if: steps.check_changes.outputs.has_changes == 'true'
      run: |
        # Set variables
        GITEA_URL="${{ secrets.GT_URL }}"
        GITEA_TOKEN="${{ secrets.GT_TOKEN }}"
        GITEA_OWNER="${{ secrets.GT_OWNER }}"
        GITEA_REPO="${{ secrets.GT_REPO }}"
        BRANCH_NAME="auto-update-readme-$(date +%Y%m%d-%H%M%S)"

        echo "🔍 Configuration:"
        echo "GITEA_URL: ${GITEA_URL:-NOT SET}"
        echo "GITEA_OWNER: ${GITEA_OWNER:-NOT SET}"
        echo "GITEA_REPO: ${GITEA_REPO:-NOT SET}"
        echo "BRANCH_NAME: $BRANCH_NAME"

        # Create and push new branch
        echo "🌿 Creating branch: $BRANCH_NAME"
        git checkout -b "$BRANCH_NAME"
        git add README.md
        git commit -m "Auto-update README with current k8s applications" \
                   -m "Generated by CI/CD workflow on $(date +%Y-%m-%d\ %H:%M:%S)" \
                   -m "This PR updates the README.md file with the current list of applications found in the k8s/ directory structure."

        # Push branch to remote
        echo "📤 Pushing branch to remote..."
        git push origin "$BRANCH_NAME"

        # Create Pull Request using Gitea API
        echo "🔀 Creating Pull Request..."

        PR_TITLE="Auto-update README with k8s applications"

        # Create PR body
        cat > /tmp/pr_body.json <<EOF
        {
          "title": "$PR_TITLE",
          "body": "This PR automatically updates README.md based on the current k8s/ directory structure.\n\n## Changes\n- Updated application list in README.md\n- Applications are now synced with k8s/ folders\n\n## Review\nPlease review and merge if everything looks correct.\n\n---\n🤖 This PR was automatically generated by CI/CD workflow\n⏰ Generated at: $(date '+%Y-%m-%d %H:%M:%S')",
          "head": "$BRANCH_NAME",
          "base": "main"
        }
        EOF

        # Create PR via API
        echo "Making API request to: $GITEA_URL/api/v1/repos/$GITEA_OWNER/$GITEA_REPO/pulls"
        echo "Request body:"
        cat /tmp/pr_body.json

        RESPONSE=$(curl -s -w "\nHTTP_CODE:%{http_code}" -X POST \
          -H "Authorization: token $GITEA_TOKEN" \
          -H "Content-Type: application/json" \
          -d @/tmp/pr_body.json \
          "$GITEA_URL/api/v1/repos/$GITEA_OWNER/$GITEA_REPO/pulls")

        # Extract HTTP code and response body
        HTTP_CODE=$(echo "$RESPONSE" | grep "HTTP_CODE:" | cut -d':' -f2)
        RESPONSE_BODY=$(echo "$RESPONSE" | sed '/HTTP_CODE:/d')

        echo "API Response (HTTP $HTTP_CODE):"
        echo "$RESPONSE_BODY"

        # Extract PR number and URL from response
        PR_NUMBER=$(echo "$RESPONSE_BODY" | grep -o '"number":[0-9]*' | head -1 | cut -d':' -f2)

        if [ -n "$PR_NUMBER" ] && [ "$HTTP_CODE" = "201" ]; then
          echo "✅ Pull Request created successfully!"
          echo "📝 PR #$PR_NUMBER"
          echo "🔗 URL: $GITEA_URL/$GITEA_OWNER/$GITEA_REPO/pulls/$PR_NUMBER"

          # Save PR info for summary
          echo "pr_number=$PR_NUMBER" >> $GITHUB_OUTPUT
          echo "pr_url=$GITEA_URL/$GITEA_OWNER/$GITEA_REPO/pulls/$PR_NUMBER" >> $GITHUB_OUTPUT
        else
          echo "⚠️ Failed to create Pull Request (HTTP $HTTP_CODE)"
          echo "Response: $RESPONSE_BODY"

          # Check if PR already exists
          if echo "$RESPONSE_BODY" | grep -q "already exists"; then
            echo "ℹ️ PR already exists for this branch"
            exit 0
          fi

          exit 1
        fi

    - name: Summary
      if: always()
      run: |
        echo "## 📊 README Update Summary" >> $GITHUB_STEP_SUMMARY

        if [ -f "README.md" ]; then
          echo "- ✅ README generated successfully" >> $GITHUB_STEP_SUMMARY

          if [ "${{ steps.check_changes.outputs.has_changes }}" = "true" ]; then
            echo "- ✅ Changes detected" >> $GITHUB_STEP_SUMMARY
            echo "- ✅ Pull Request created" >> $GITHUB_STEP_SUMMARY

            if [ -n "${{ steps.create_pr.outputs.pr_number }}" ]; then
              echo "" >> $GITHUB_STEP_SUMMARY
              echo "**PR:** [#${{ steps.create_pr.outputs.pr_number }}](${{ steps.create_pr.outputs.pr_url }})" >> $GITHUB_STEP_SUMMARY
            fi
          else
            echo "- ℹ️ No changes detected - README already up to date" >> $GITHUB_STEP_SUMMARY
          fi
        else
          echo "- ❌ README generation failed" >> $GITHUB_STEP_SUMMARY
        fi

        echo "" >> $GITHUB_STEP_SUMMARY
        echo "**Generated at:** $(date)" >> $GITHUB_STEP_SUMMARY