name: Claude Code Review

permissions:
  contents: read
  pull-requests: write

on:
  pull_request:
    types: [opened, reopened, synchronize]
  workflow_dispatch:
    inputs:
      pr_number:
        description: 'Pull Request Number'
        required: true
        type: string

jobs:
  code-review:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Get PR number
        id: pr-number
        run: |
          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            echo "number=${{ inputs.pr_number }}" >> $GITHUB_OUTPUT
          else
            echo "number=${{ github.event.pull_request.number }}" >> $GITHUB_OUTPUT
          fi

      - name: Get PR details
        if: github.event_name == 'workflow_dispatch'
        id: pr-details
        uses: actions/github-script@v7
        with:
          script: |
            const pr = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.name,
              pull_number: ${{ inputs.pr_number }}
            });
            console.log(`Base SHA: ${pr.data.base.sha}`);
            console.log(`Head SHA: ${pr.data.head.sha}`);
            return {
              base_sha: pr.data.base.sha,
              head_sha: pr.data.head.sha
            }

      - name: Get changed files
        id: changed-files
        run: |
          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            BASE_SHA=${{ fromJSON(steps.pr-details.outputs.result).base_sha }}
            HEAD_SHA=${{ fromJSON(steps.pr-details.outputs.result).head_sha }}
          else
            BASE_SHA=${{ github.event.pull_request.base.sha }}
            HEAD_SHA=${{ github.event.pull_request.head.sha }}
          fi
          
          # Get the diff and save to a file
          git diff $BASE_SHA..$HEAD_SHA > changes.diff
          
          # Create a filtered version without ignored files
          cat changes.diff | grep -v -E '(package-lock.json|yarn.lock|node_modules|\.md$|\.json$)' | grep -E '\.(js|ts|py|cpp|h|java|cs)$' > filtered_changes.diff
          
          # Store the size of the diff
          echo "diff_size=$(stat -f%z filtered_changes.diff)" >> $GITHUB_OUTPUT

      - name: Analyze code with Claude
        if: steps.changed-files.outputs.diff_size != '0'
        id: analysis
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
        run: |
          DIFF_CONTENT=$(cat filtered_changes.diff)
          
          # Prepare the API request
          PROMPT="You are performing a code review. Please analyze this code diff and provide a thorough review that covers:

          1. Potential conflicts with existing codebase
          2. Code correctness and potential bugs
          3. Security vulnerabilities or risks
          4. Performance implications
          5. Maintainability and readability issues
          6. Adherence to best practices and coding standards
          7. Suggestions for improvements

          For each issue found:
          - Explain the problem clearly
          - Rate the severity (Critical/High/Medium/Low)
          - Provide specific recommendations for fixes
          - Include code examples where helpful

          If no issues are found in a particular area, explicitly state that.

          Here is the code diff to review:

          \`\`\`
          $DIFF_CONTENT
          \`\`\`"

          # Make the API request
          RESPONSE=$(curl -s https://api.anthropic.com/v1/messages \
            -H "Content-Type: application/json" \
            -H "x-api-key: $ANTHROPIC_API_KEY" \
            -H "anthropic-version: 2023-06-01" \
            -d "{
              \"model\": \"claude-3-sonnet-20240229\",
              \"max_tokens\": 4096,
              \"temperature\": 0.7,
              \"messages\": [{
                \"role\": \"user\",
                \"content\": \"$PROMPT\"
              }]
            }")
          
          # Extract the review content from the response
          REVIEW=$(echo $RESPONSE | jq -r '.content[0].text')
          
          # Escape the review content for GitHub Actions
          REVIEW="${REVIEW//'%'/'%25'}"
          REVIEW="${REVIEW//$'\n'/'%0A'}"
          REVIEW="${REVIEW//$'\r'/'%0D'}"
          
          # Save the review to the output
          echo "review=$REVIEW" >> $GITHUB_OUTPUT

      - name: Post review comment
        if: steps.changed-files.outputs.diff_size != '0'
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const review = `${{ steps.analysis.outputs.review }}`;
            
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.name,
              issue_number: ${{ steps.pr-number.outputs.number }},
              body: `# Claude Code Review\n\n${review}`
            });