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
        id: pr-details
        uses: actions/github-script@v7
        with:
          script: |
            try {
              const { owner, repo } = context.repo;
              const prNumber = ${{ steps.pr-number.outputs.number }};
              
              console.log(`Getting PR #${prNumber} from ${owner}/${repo}`);
              
              const pr = await github.rest.pulls.get({
                owner: owner,
                repo: repo,
                pull_number: prNumber
              });
              
              return {
                base_sha: pr.data.base.sha,
                head_sha: pr.data.head.sha,
                base_ref: pr.data.base.ref,
                head_ref: pr.data.head.ref
              };
            } catch (error) {
              core.setFailed(`Failed to get PR details: ${error.message}`);
              throw error;
            }

      - name: Generate full diff
        id: prepare
        run: |
          # Configure git to fetch PR refs
          git config --local --add remote.origin.fetch "+refs/pull/*/head:refs/remotes/origin/pr/*"
          git fetch origin
          
          BASE_SHA="${{ fromJSON(steps.pr-details.outputs.result).base_sha }}"
          HEAD_SHA="${{ fromJSON(steps.pr-details.outputs.result).head_sha }}"
          
          echo "Comparing $BASE_SHA..$HEAD_SHA"
          
          # Create a temporary directory for our files
          mkdir -p /tmp/review
          
          # Get the full diff with context and store it
          git diff -U10 "$BASE_SHA" "$HEAD_SHA" > /tmp/review/full.diff
          
          # Create filtered version for relevant files only
          cat /tmp/review/full.diff | \
            awk '/^diff --git/{p=0} /\.(js|ts|py|cpp|h|java|cs)$/{p=1} p' | \
            grep -v -E '^diff --git .*(package-lock\.json|yarn\.lock|\.md|\.json)' > /tmp/review/filtered.diff
          
          if [ -s /tmp/review/filtered.diff ]; then
            DIFF_SIZE=$(wc -c < /tmp/review/filtered.diff)
            echo "Found $DIFF_SIZE bytes of relevant changes"
            echo "diff_size=$DIFF_SIZE" >> $GITHUB_OUTPUT
            
            # Store full diff content in the output
            {
              echo 'diff_content<<EOF'
              cat /tmp/review/filtered.diff
              echo 'EOF'
            } >> $GITHUB_OUTPUT
            
            echo "Preview of changes:"
            head -n 10 /tmp/review/filtered.diff
          else
            echo "No relevant file changes found"
            echo "diff_size=0" >> $GITHUB_OUTPUT
          fi

      - name: Debug diff content
        if: steps.prepare.outputs.diff_size != '0'
        run: |
          echo "Full diff content:"
          echo "${{ steps.prepare.outputs.diff_content }}"

      - name: Analyze code with Claude
        if: steps.prepare.outputs.diff_size != '0'
        id: analysis
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
        run: |
          DIFF_CONTENT="${{ steps.prepare.outputs.diff_content }}"
          
          # Create request body using cat and a heredoc to preserve formatting
          REQUEST_BODY=$(cat << 'EOF' | jq -c .
          {
            "model": "claude-3-sonnet-20240229",
            "max_tokens": 4096,
            "temperature": 0.7,
            "messages": [{
              "role": "user",
              "content": "You are performing a code review. Please analyze this code diff and provide a thorough review that covers:\n\n1. Potential conflicts with existing codebase\n2. Code correctness and potential bugs\n3. Security vulnerabilities or risks\n4. Performance implications\n5. Maintainability and readability issues\n6. Adherence to best practices and coding standards\n7. Suggestions for improvements\n\nFor each issue found:\n- Explain the problem clearly\n- Rate the severity (Critical/High/Medium/Low)\n- Provide specific recommendations for fixes\n- Include code examples where helpful\n\nIf no issues are found in a particular area, explicitly state that.\n\nHere is the code diff to review:\n\n\`\`\`\n${DIFF_CONTENT}\n\`\`\`"
            }]
          }
          EOF
          )

          # Make the API request
          echo "Sending request to Claude API..."
          RESPONSE=$(curl -s https://api.anthropic.com/v1/messages \
            -H "Content-Type: application/json" \
            -H "x-api-key: $ANTHROPIC_API_KEY" \
            -H "anthropic-version: 2023-06-01" \
            -d "$REQUEST_BODY")
          
          if echo "$RESPONSE" | jq -e '.content[0].text' > /dev/null; then
            {
              echo 'review<<EOF'
              echo "$RESPONSE" | jq -r '.content[0].text'
              echo 'EOF'
            } >> $GITHUB_OUTPUT
          else
            echo "Error in Claude API response: $RESPONSE"
            exit 1
          fi

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