name: ClaudeCode - Slang Assistant

permissions:
  contents: write
  pull-requests: write
  issues: write
  actions: read
  id-token: write

on:
  issue_comment:
    types: [created]
  pull_request_review_comment:
    types: [created]
  issues:
    types: [opened, assigned]
  pull_request_review:
    types: [submitted]

env:
  AWS_REGION: ${{ vars.AWS_REGION }}
  AWS_ACCESS_KEY_ID: ${{ vars.AWS_ACCESS_KEY_ID }}
  AWS_SECRET_ACCESS_KEY: ${{ vars.AWS_SECRET_ACCESS_KEY }}

jobs:
  claude:
    name: Claude Code Assistant
    if: |
      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||
      (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude')) ||
      (github.event_name == 'pull_request_review' && contains(github.event.review.body, '@claude')) ||
      (github.event_name == 'issues' && (contains(github.event.issue.body, '@claude')))

    runs-on: ubuntu-latest
    timeout-minutes: 360

    # Cancel previous runs on new pushes
    concurrency:
      group: claude-${{ github.event.issue.number || github.event.pull_request.number || github.run_id }}
      cancel-in-progress: true

    steps:
      # Format setup and environment preparation
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          submodules: "recursive"
          fetch-depth: 2 # fetch minimal history for git context

      - name: Format Setup and Environment Preparation
        uses: ./.github/actions/format-setup

      - name: Setup Environment Dependencies
        run: |
          set -euo pipefail
          echo "🏗️ Setting up environment dependencies..."

          sudo apt-get update
          sudo apt-get install -y libx11-dev

          # Configure and build the project
          cmake --preset default --fresh
          cmake --workflow --preset debug

          echo "✅ Environment setup completed"

      # Validate environment and dependencies
      - name: Validate Environment
        run: |
          set -euo pipefail

          # Check required secrets
          if [ -z "${{ secrets.LLMGW_ID }}" ] || [ -z "${{ secrets.LLMGW_SECRET }}" ] || [ -z "${{ secrets.LLMGW_TOKEN_URL }}" ]; then
            echo "::error::Missing required secrets: LLMGW_ID or LLMGW_SECRET or LLMGW_TOKEN_URL"
            exit 1
          fi

          # Install required tools
          command -v jq >/dev/null 2>&1 || { echo "::error::jq is required but not installed"; exit 1; }
          command -v curl >/dev/null 2>&1 || { echo "::error::curl is required but not installed"; exit 1; }

          echo "✅ Environment validation passed"

      # Generate custom auth token and set as environment variable
      - name: Generate Custom Auth Token
        id: auth-token
        env:
          LLMGW_TOKEN_URL: ${{ secrets.LLMGW_TOKEN_URL }}
        run: |
          set -euo pipefail

          echo "🔐 Generating authentication token..."

          # Set up error handling
          cleanup() {
            local exit_code=$?
            echo "🧹 Cleaning up temporary files..."
            rm -f /tmp/token_response.json 2>/dev/null || true
            if [ $exit_code -ne 0 ]; then
              echo "::error::Authentication failed - check your credentials and endpoint"
            fi
            exit $exit_code
          }
          trap cleanup EXIT

          # Generate token with comprehensive error handling
          HTTP_CODE=$(curl -s -w "%{http_code}" -o /tmp/token_response.json --fail-with-body \
            --max-time 30 \
            --retry 3 \
            --retry-delay 2 \
            --location "${{ env.LLMGW_TOKEN_URL }}" \
            --header 'Content-Type: application/x-www-form-urlencoded' \
            --header "Authorization: Basic $(echo -n ${{ secrets.LLMGW_ID }}:${{ secrets.LLMGW_SECRET }} | base64 -w0)" \
            --data-urlencode 'grant_type=client_credentials' \
            --data-urlencode 'scope=awsanthropic-readwrite azureopenai-readwrite' \
            2>/dev/null)

          # Check HTTP response code
          if [ "$HTTP_CODE" -ne 200 ]; then
            echo "::error::Authentication failed with HTTP code: $HTTP_CODE"
            if [ -f /tmp/token_response.json ]; then
              echo "::error::Response: $(cat /tmp/token_response.json | head -c 200)"
            fi
            exit 1
          fi

          # Extract and validate token
          if [ ! -f /tmp/token_response.json ]; then
            echo "::error::No response file generated"
            exit 1
          fi

          ANTHROPIC_AUTH_TOKEN=$(jq -r '.access_token // empty' /tmp/token_response.json 2>/dev/null)

          # Validate token format and length
          if [ -z "$ANTHROPIC_AUTH_TOKEN" ] || [ "$ANTHROPIC_AUTH_TOKEN" = "null" ]; then
            echo "::error::Failed to extract access token from response"
            exit 1
          fi

          # Basic token validation
          if [ ${#ANTHROPIC_AUTH_TOKEN} -lt 10 ]; then
            echo "::error::Token appears to be too short (${#ANTHROPIC_AUTH_TOKEN} characters)"
            exit 1
          fi

          # CRITICAL: Mask the token BEFORE any output
          echo "::add-mask::$ANTHROPIC_AUTH_TOKEN"

          # Set as environment variable for subsequent steps
          echo "ANTHROPIC_AUTH_TOKEN=$ANTHROPIC_AUTH_TOKEN" >> $GITHUB_ENV

          # Set token expiry if available
          TOKEN_EXPIRES=$(jq -r '.expires_in // empty' /tmp/token_response.json 2>/dev/null)
          if [ -n "$TOKEN_EXPIRES" ]; then
            echo "::add-mask::$TOKEN_EXPIRES"
            echo "token-expires=$TOKEN_EXPIRES" >> $GITHUB_OUTPUT
          fi

          echo "✅ Authentication token generated and masked successfully"

          # Clean up response file
          rm -f /tmp/token_response.json

      # Generate GitHub App token for better GitHub API access
      - name: Generate GitHub App Token
        id: github-token
        uses: actions/create-github-app-token@v1
        with:
          app-id: ${{ secrets.APP_ID }}
          private-key: ${{ secrets.APP_PRIVATE_KEY }}
        continue-on-error: true

      # Set up fallback authentication
      - name: Configure Authentication
        id: auth-config
        run: |
          set -euo pipefail

          # Use GitHub App token if available, otherwise use GITHUB_TOKEN
          if [ -n "${{ steps.github-token.outputs.token }}" ]; then
            echo "github-token=${{ steps.github-token.outputs.token }}" >> $GITHUB_OUTPUT
            echo "✅ Using GitHub App authentication"
          else
            echo "github-token=${{ secrets.GITHUB_TOKEN }}" >> $GITHUB_OUTPUT
            echo "⚠️  Using fallback GITHUB_TOKEN authentication"
          fi

      # Run Claude Code Action with optimized environment variables
      - name: Execute Claude Code Action # Right now direct prompt to automatic PR Review
        id: claude-action
        uses: anthropics/claude-code-action@v0.0.38
        with:
          # Direct Prompt is for testing. We shall use the triggers (on) which shall trigger this part on runtime
          custom_instructions: |
            # Build system information:
            - OS: Ubuntu Linux
            - Project is pre-built and ready for development tasks
            - See CLAUDE.md for detailed build, test, and formatting instructions

            # CRITICAL: You have access to the mcp__deepwiki__ask_question tool for deep repository knowledge.

              **How to use this tool effectively:**
              - Use repoName: "shader-slang/slang" for all queries
              - Ask specific technical questions about architecture, patterns, or implementation approaches
              - Examples: "What does the type legalization pass do?" or "What's the pattern for adding new code generation targets?"
              - Use responses to understand existing patterns before implementing changes

              **Implementation Guidelines:**
              - Always follow existing code patterns and architectural decisions discovered through deepwiki
              - Consult the tool when you need context about unfamiliar parts of the codebase

          mcp_config: |
            {
              "mcpServers": {
                "deepwiki": {
                  "type": "sse",
                  "url": "https://mcp.deepwiki.com/sse"
                }
              }
            }
          allowed_tools: "Bash,View,GlobTool,GrepTool,BatchTool,Write,mcp__deepwiki__ask_question"
          trigger_phrase: "@claude"
          assignee_trigger: "claude"
          timeout_minutes: "600"
          github_token: ${{ steps.auth-config.outputs.github-token }}
          use_bedrock: "true"
          model: ${{ vars.ANTHROPIC_MODEL }}
          max_turns: "50000"
          # Use claude_env for custom environment variables
          claude_env: |
            ANTHROPIC_BEDROCK_BASE_URL: ${{ vars.ANTHROPIC_BEDROCK_BASE_URL }}
            ANTHROPIC_SMALL_FAST_MODEL: ${{ vars.ANTHROPIC_SMALL_FAST_MODEL }}
            AWS_REGION: ${{ vars.AWS_REGION }}
            GITHUB_REPOSITORY: ${{ github.repository }}
            GITHUB_EVENT_NAME: ${{ github.event_name }}
            GITHUB_ACTOR: ${{ github.actor }}
            ANTHROPIC_AUTH_TOKEN: ${{ env.ANTHROPIC_AUTH_TOKEN }}
            DISABLE_TELEMETRY: 1

        # The ANTHROPIC_API_KEY environment variable is automatically picked up
        continue-on-error: true

      # Handle action results and errors
      - name: Handle Action Results
        if: always()
        run: |
          set -euo pipefail

          # Check if Claude action succeeded
          if [ "${{ steps.claude-action.outcome }}" = "success" ]; then
            echo "✅ Claude Code action completed successfully"

            # Optional: Add success comment to PR/issue
            if [ -n "${{ github.event.issue.number || github.event.pull_request.number }}" ]; then
              echo "Claude has successfully processed your request! 🎉" >> /tmp/comment.md
              echo "<!-- Claude-success -->" >> /tmp/comment.md
            fi

          elif [ "${{ steps.claude-action.outcome }}" = "failure" ]; then
            echo "❌ Claude Code action failed"

            # Create error comment for debugging
            cat > /tmp/error_comment.md << 'EOF'
          ## Claude Code Action Failed ❌

          The Claude Code action encountered an error. This could be due to:
          - Network connectivity issues
          - Authentication problems
          - Model availability issues
          - Rate limiting

          Please check the workflow logs for more details and try again.

          <!-- Claude-error -->
          EOF

          else
            echo "⚠️  Claude Code action was cancelled or skipped"
          fi

      # Security cleanup
      - name: Security Cleanup
        if: always()
        run: |
          set -euo pipefail

          echo "🧹 Performing security cleanup..."

          # Clear any temporary files that might contain sensitive data
          find /tmp -name "*token*" -type f -delete 2>/dev/null || true
          find /tmp -name "*auth*" -type f -delete 2>/dev/null || true
          find /tmp -name "*response*" -type f -delete 2>/dev/null || true

          # Clear environment variables (belt and suspenders approach)
          unset ANTHROPIC_API_KEY 2>/dev/null || true
          unset ANTHROPIC_AUTH_TOKEN 2>/dev/null || true

          echo "✅ Security cleanup completed"

      # Workflow summary
      - name: Workflow Summary
        if: always()
        run: |
          echo "## Claude Code Workflow Summary" >> $GITHUB_STEP_SUMMARY
          echo "- **Trigger**: ${{ github.event_name }}" >> $GITHUB_STEP_SUMMARY
          echo "- **Repository**: ${{ github.repository }}" >> $GITHUB_STEP_SUMMARY
          echo "- **Actor**: ${{ github.actor }}" >> $GITHUB_STEP_SUMMARY
          echo "- **Auth Token**: ✅ Generated" >> $GITHUB_STEP_SUMMARY
          echo "- **GitHub Token**: ${{ steps.github-token.outcome == 'success' && '✅ GitHub App' || '⚠️ Fallback' }}" >> $GITHUB_STEP_SUMMARY
          echo "- **Claude Action**: ${{ steps.claude-action.outcome == 'success' && '✅ Success' || '❌ Failed' }}" >> $GITHUB_STEP_SUMMARY
          echo "- **Model Used**: ${{ vars.ANTHROPIC_MODEL || 'default' }}" >> $GITHUB_STEP_SUMMARY
          echo "- **Workflow Status**: ${{ job.status }}" >> $GITHUB_STEP_SUMMARY