name: Validate Recipe PR

on:
  pull_request_target:
    types: [opened, synchronize, reopened]
    paths:
      - 'documentation/src/pages/recipes/data/recipes/**'

permissions:
  contents: read
  pull-requests: write
  issues: write

jobs:
  validate-recipe:
    runs-on: ubuntu-latest

    env:
      PROVIDER_API_KEY: ${{ secrets.OPENROUTER_API_KEY }}

    steps:
      - name: Checkout PR
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          fetch-depth: 0

      - name: Set up Node.js
        uses: actions/setup-node@v3
        with:
          node-version: '20'

      - name: Install and Configure goose
        run: |
          mkdir -p /home/runner/.local/bin
          curl -fsSL https://github.com/block/goose/releases/download/stable/download_cli.sh \
            | CONFIGURE=false INSTALL_PATH=/home/runner/.local/bin bash
          echo "/home/runner/.local/bin" >> $GITHUB_PATH

          mkdir -p ~/.config/goose
          cat <<EOF > ~/.config/goose/config.yaml
          GOOSE_PROVIDER: openrouter
          GOOSE_MODEL: "anthropic/claude-sonnet-4"
          keyring: false
          EOF

      - name: Check if recipe files changed in this push
        id: recipe_changes
        run: |
          set -e
          echo "🔍 Checking if recipe files were modified in this push..."
          
          # Get the list of changed files in this specific push (added/modified only, not deleted)
          if [ "${{ github.event_name }}" = "pull_request" ] && [ "${{ github.event.action }}" = "synchronize" ]; then
            # For synchronize events, check files changed since the previous commit
            echo "📝 Synchronize event - checking files changed since previous commit"
            CHANGED_FILES=$(git diff --name-only --diff-filter=AM ${{ github.event.before }}..${{ github.event.after }})
          else
            # For opened/reopened, check all files in the PR (compare PR head against base)
            echo "📝 PR opened/reopened - checking all files in PR"
            CHANGED_FILES=$(git diff --name-only --diff-filter=AM ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }})
          fi
          
          echo "Changed files in this push:"
          echo "$CHANGED_FILES"
          echo ""
          
          # Check if any recipe files were changed
          if echo "$CHANGED_FILES" | grep -q "^documentation/src/pages/recipes/data/recipes/"; then
            echo "recipe_files_changed=true" >> "$GITHUB_OUTPUT"
            echo "✅ Recipe files were modified in this push - proceeding with validation"
          else
            echo "recipe_files_changed=false" >> "$GITHUB_OUTPUT"
            echo "ℹ️ No recipe files were modified in this push - skipping validation"
          fi

      - name: Find recipe files in PR (new or modified)
        id: find_changed_recipes
        if: steps.recipe_changes.outputs.recipe_files_changed == 'true'
        run: |
          set -e
          echo "Looking for recipe files in PR (new or modified)..."
          
          # Get the list of changed/new files in this PR (added/modified only, not deleted)
          if [ "${{ github.event_name }}" = "pull_request" ] && [ "${{ github.event.action }}" = "synchronize" ]; then
            # For synchronize events, check files changed since the previous commit
            echo "📝 Synchronize event - checking files changed/added since previous commit"
            CHANGED_FILES=$(git diff --name-only --diff-filter=AM ${{ github.event.before }}..${{ github.event.after }})
          else
            # For opened/reopened, check all files in the PR (compare PR head against base)
            echo "📝 PR opened/reopened - checking all new/modified files in PR"
            CHANGED_FILES=$(git diff --name-only --diff-filter=AM ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }})
          fi
          
          # Filter for recipe files only that were changed or added
          RECIPE_FILES=$(echo "$CHANGED_FILES" | grep "^documentation/src/pages/recipes/data/recipes/" | grep -E "\.(yaml|yml)$" || true)
          
          if [ -z "$RECIPE_FILES" ]; then
            echo "No changed recipe files found in PR"
            echo "validation_status=no_files" >> $GITHUB_OUTPUT
            exit 1
          fi
          
          echo "Found changed recipe files:"
          echo "$RECIPE_FILES"
          
          # Save recipe file paths for validation step
          echo "$RECIPE_FILES" > /tmp/changed_recipe_files.txt

      - name: Validate changed recipe files
        id: validate
        if: steps.recipe_changes.outputs.recipe_files_changed == 'true'
        run: |
          set -e
          # Read the list of changed recipe files
          RECIPE_FILES=$(cat /tmp/changed_recipe_files.txt)
          
          ALL_VALID=true
          VALIDATION_OUTPUT=""
          
          # First pass: Basic YAML validation
          while IFS= read -r RECIPE_FILE; do
            if [ -f "$RECIPE_FILE" ]; then
              BASE_RECIPE_FILENAME=$(basename "$RECIPE_FILE")
              echo "🔍 Validating: $BASE_RECIPE_FILENAME"
              if OUTPUT=$(goose recipe validate "$RECIPE_FILE" 2>&1); then
                echo "✅ Valid: $BASE_RECIPE_FILENAME"
                VALIDATION_OUTPUT="${VALIDATION_OUTPUT}✅ $BASE_RECIPE_FILENAME: VALID\n"
              else
                echo "❌ Invalid: $BASE_RECIPE_FILENAME"
                echo "$OUTPUT"
                VALIDATION_OUTPUT="${VALIDATION_OUTPUT}❌ $BASE_RECIPE_FILENAME: INVALID\n\`\`\`\n$OUTPUT\n\`\`\`\n"
                ALL_VALID=false
              fi
            fi
          done < /tmp/changed_recipe_files.txt
          
          # Second pass: Check for duplicate filenames
          if [ "$ALL_VALID" = true ]; then
            echo "🔍 Checking for duplicate filenames..."
            
            # Check for duplicate filenames first
            SEEN_FILENAMES=""
            while IFS= read -r RECIPE_FILE; do
              if [ -f "$RECIPE_FILE" ]; then
                FILENAME=$(basename "$RECIPE_FILE" .yaml)
                FILENAME=$(basename "$FILENAME" .yml)
                
                echo "📋 Checking filename: '$FILENAME'"
                
                # Check if we've seen this filename before in this PR
                if echo "$SEEN_FILENAMES" | grep -q "^$FILENAME$"; then
                  echo "❌ Duplicate filename '$FILENAME' found in this PR"
                  VALIDATION_OUTPUT="${VALIDATION_OUTPUT}❌ Duplicate filename '$FILENAME' found in this PR\n"
                  ALL_VALID=false
                else
                  SEEN_FILENAMES="$SEEN_FILENAMES\n$FILENAME"
                fi
                
                # Check if this is a new file or an update to existing file
                # Get list of changed files in this PR compared to base branch
                CHANGED_FILES=$(git diff --name-only --diff-filter=AM ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }} | grep "^$RECIPE_FILE$" || true)
                EXISTING_FILES=$(find documentation/src/pages/recipes/data/recipes/ -name "$FILENAME.yaml" -o -name "$FILENAME.yml" | grep -v "^$RECIPE_FILE$" || true)
                
                if [ -n "$EXISTING_FILES" ] && [ -z "$CHANGED_FILES" ]; then
                  # File exists in repo but is not being modified - this is a new duplicate
                  echo "❌ Recipe filename '$FILENAME' already exists:"
                  echo "$EXISTING_FILES"
                  VALIDATION_OUTPUT="${VALIDATION_OUTPUT}❌ $RECIPE_FILE: Filename '$FILENAME' already exists in: $EXISTING_FILES\n"
                  ALL_VALID=false
                elif [ -n "$EXISTING_FILES" ] && [ -n "$CHANGED_FILES" ]; then
                  # File exists and is being modified - this is an update
                  echo "✅ Updating existing recipe: '$FILENAME'"
                else
                  # File doesn't exist - this is a new recipe
                  echo "✅ New recipe filename '$FILENAME' is unique"
                fi
                
                echo "✅ Filename '$FILENAME' validation complete"
              fi
            done < /tmp/changed_recipe_files.txt
          fi
          
          # Save validation output for use in comment
          echo "$VALIDATION_OUTPUT" > /tmp/validation_output.txt
          
          if [ "$ALL_VALID" = true ]; then
            echo "validation_status=valid" >> $GITHUB_OUTPUT
          else
            echo "validation_status=invalid" >> $GITHUB_OUTPUT
          fi

      - name: Comment validation results
        if: steps.recipe_changes.outputs.recipe_files_changed == 'true'
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const fs = require('fs');
            const status = '${{ steps.validate.outputs.validation_status }}';
            
            let comment;
            if (status === 'no_files') {
              comment = `❌ **Recipe Validation Failed**
              
              No recipe files found in the correct location!
              
              📁 **Please add your recipe to**: \`documentation/src/pages/recipes/data/recipes/your-recipe-id.yaml\`
              
              **Example**: If your recipe ID is \`web-scraper\`, create:
              \`documentation/src/pages/recipes/data/recipes/web-scraper.yaml\``;
            } else if (status === 'valid') {
              comment = `✅ **Recipe Validation Passed**
              
              Your recipe(s) are valid and ready for review!
              
              🔍 **Next Steps**:
              1. Our team will review your recipe
              2. If approved, we'll run a security scan
              3. Once merged, you'll receive $10 in OpenRouter credits (if email provided)
              
              Thanks for contributing to the goose Recipe Cookbook! 🎉`;
            } else {
              // Read validation details from file
              let validationDetails = '';
              try {
                validationDetails = fs.readFileSync('/tmp/validation_output.txt', 'utf8');
              } catch (e) {
                validationDetails = 'See workflow logs for details.';
              }
              
              comment = `❌ **Recipe Validation Failed**
              
              Please fix the validation errors and push your changes:
              
              ${validationDetails}
              
              📚 Check our [Recipe Guide](https://block.github.io/goose/recipes) for help with the correct format.`;
            }
            
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
              body: comment
            });

      - name: Set validation status
        if: always()
        run: |
          # Check if recipe files were changed in this PR
          if [ "${{ steps.recipe_changes.outputs.recipe_files_changed }}" = "false" ]; then
            # No recipe files were modified in this PR - validation skipped
            echo "ℹ️ No recipe files in PR - validation skipped"
            exit 0
          fi

          VALIDATION_STATUS="${{ steps.validate.outputs.validation_status }}"
          if [ "$VALIDATION_STATUS" = "valid" ]; then
            echo "✅ All recipes are valid"
            exit 0
          else
            echo "❌ Recipe validation failed"
            exit 1
          fi