name: 'Evals: PR Impact'

on:
  pull_request:
    paths:
      - 'packages/core/src/prompts/**'
      - 'packages/core/src/tools/**'
      - 'packages/core/src/agents/**'
      - 'evals/**'

permissions:
  contents: 'read'
  checks: 'write'
  pull-requests: 'write'

jobs:
  eval-impact:
    name: 'Eval Impact Analysis'
    runs-on: 'gemini-cli-ubuntu-16-core'
    if: "github.repository == 'google-gemini/gemini-cli'"
    steps:
      - name: 'Checkout'
        uses: 'actions/checkout@v4'

      - name: 'Set up Node.js'
        uses: 'actions/setup-node@v4'
        with:
          node-version-file: '.nvmrc'
          cache: 'npm'

      - name: 'Install dependencies'
        run: 'npm ci'

      - name: 'Build project'
        run: 'npm run build'

      - name: 'Create logs directory'
        run: 'mkdir -p evals/logs'

      - name: 'Run Evals (Lite)'
        env:
          GEMINI_API_KEY: '${{ secrets.GEMINI_API_KEY }}'
          RUN_EVALS: 'true'
        run: |
          # Run 1 attempt on critical models for speed in PR
          MODELS=("gemini-3.1-pro-preview-customtools" "gemini-3-flash-preview")
          for model in "${MODELS[@]}"; do
            echo "Running evals for $model..."
            mkdir -p "evals/logs/eval-logs-$model-1"
            # We redirect to report.json in a subfolder so aggregate_evals.js can find it via subfolder name
            GEMINI_MODEL=$model npm run test:all_evals -- --outputFile.json="evals/logs/eval-logs-$model-1/report.json"
          done

      - name: 'Generate Impact Report'
        id: 'generate-report'
        env:
          GH_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
        run: |
          echo "<!-- eval-impact-report -->" > report.md
          node scripts/aggregate_evals.js evals/logs --compare-main --pr-comment >> report.md
          cat report.md >> "$GITHUB_STEP_SUMMARY"
          
          # Check if there are any regressions (🔴)
          if grep -q "🔴" report.md; then
            echo "REGRESSION_DETECTED=true" >> "$GITHUB_ENV"
          fi

      - name: 'Comment on PR'
        env:
          GH_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
        run: |
          PR_NUMBER=${{ github.event.pull_request.number }}
          # Try to find existing comment to avoid spamming
          EXISTING_COMMENT=$(gh pr view $PR_NUMBER --json comments --jq '.comments[] | select(.body | contains("eval-impact-report")) | .id' | head -n 1)
          
          if [ -n "$EXISTING_COMMENT" ]; then
            # We can't easily edit by ID with 'gh pr comment', so we just post a new one for now
            # but in the future we could use 'gh api' to update.
            gh pr comment $PR_NUMBER --body-file report.md
          else
            gh pr comment $PR_NUMBER --body-file report.md
          fi

      - name: 'Fail if regression detected'
        if: "env.REGRESSION_DETECTED == 'true'"
        run: |
          echo "Behavioral evaluation regressions detected. Please check the impact report."
          exit 1