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 diff and analyze
        id: analysis
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
        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"
          
          # Get the full diff with context
          git diff -U10 "$BASE_SHA" "$HEAD_SHA" > diff_full.txt
          
          # Filter for relevant files
          cat diff_full.txt | \
            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)' > diff_filtered.txt
          
          if [ ! -s diff_filtered.txt ]; then
            echo "No relevant changes found"
            echo "diff_size=0" >> $GITHUB_OUTPUT
            exit 0
          fi
          
          DIFF_SIZE=$(wc -c < diff_filtered.txt)
          echo "Found $DIFF_SIZE bytes of relevant changes"
          echo "diff_size=$DIFF_SIZE" >> $GITHUB_OUTPUT
          
          # Prepare the diff content
          DIFF_CONTENT=$(cat diff_filtered.txt)
          
          # Create the JSON payload
          read -r -d '' PROMPT << EOM
          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}
          \`\`\`
          EOM
          
          # Create API request JSON
          REQUEST_JSON=$(jq -n \
            --arg prompt "$PROMPT" \
            '{
              "model": "claude-3-sonnet-20240229",
              "max_tokens": 4096,
              "temperature": 0.7,
              "messages": [
                {
                  "role": "user",
                  "content": $prompt
                }
              ]
            }')
          
          # Make API request and capture response in a file to preserve formatting
          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_JSON")
          
          if echo "$RESPONSE" | jq -e '.content[0].text' > /dev/null; then
            echo 'review<<EOF' >> $GITHUB_OUTPUT
            echo "$RESPONSE" | jq -r '.content[0].text' >> $GITHUB_OUTPUT
            echo 'EOF' >> $GITHUB_OUTPUT
          else
            echo "Error in Claude API response: $RESPONSE"
            echo "Request was: $REQUEST_JSON"
            exit 1
          fi

      - name: Post review comment
        if: success() && steps.analysis.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
            });