name: "CI: Performance Regression"

defaults:
  run:
    shell: bash

on:
  pull_request:
    paths:
      - 'backend/src/**'
      - 'common/src/**'

    types:
      - opened
      - synchronize
      - ready_for_review

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
  cancel-in-progress: true

jobs:
  perf-regression:
    if: ${{ !github.event.pull_request.draft }}
    name: "Performance Regression Check"
    runs-on: penpot-runner-02
    container:
      image: penpotapp/devenv:latest
      volumes:
        - /var/cache/github-runner/m2:/root/.m2
        - /var/cache/github-runner/gitlib:/root/.gitlibs

    services:
      postgres:
        image: postgres:17
        env:
          POSTGRES_USER: penpot
          POSTGRES_PASSWORD: penpot
          POSTGRES_DB: penpot

        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5

      redis:
        image: valkey/valkey:9

    env:
      PENPOT_DATABASE_URI: "postgresql://postgres/penpot"
      PENPOT_DATABASE_USERNAME: penpot
      PENPOT_DATABASE_PASSWORD: penpot
      PENPOT_REDIS_URI: "redis://redis/1"
      PENPOT_FLAGS: "enable-demo-users enable-backend-api-doc"

    steps:
      - name: Checkout repository
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Install k6
        run: |
          curl -sSL https://dl.k6.io/key.gpg | gpg --dearmor -o /usr/share/keyrings/k6-archive-keyring.gpg
          echo "deb [signed-by=/usr/share/keyrings/k6-archive-keyring.gpg] https://dl.k6.io/deb stable main" | tee /etc/apt/sources.list.d/k6.list
          apt-get update
          apt-get install -y k6

      - name: Save performance suite
        run: cp -r backend/performance /tmp/performance

      - name: Cache Maven dependencies
        uses: actions/cache@v4
        with:
          path: |
            ~/.m2
            ~/.gitlibs
          key: ${{ runner.os }}-m2-${{ hashFiles('backend/deps.edn', 'common/deps.edn') }}
          restore-keys: |
            ${{ runner.os }}-m2-

      # -------------------------------------------------------------------------
      # Run performance tests on BASE branch (before change)
      # -------------------------------------------------------------------------

      - name: Checkout base branch
        run: |
          git fetch origin ${{ github.event.pull_request.base.ref }}
          git checkout origin/${{ github.event.pull_request.base.ref }}

      - name: Restore performance suite (base)
        run: cp -r /tmp/performance backend/performance

      - name: Start backend (base branch)
        working-directory: backend
        run: |
          clojure -M:dev -m app.main &
          # Wait for backend to be ready
          for i in $(seq 1 30); do
            if curl -s http://localhost:6060/api/rpc/command/get-profile > /dev/null 2>&1; then
              echo "Backend ready"
              break
            fi
            echo "Waiting for backend... ($i/30)"
            sleep 2
          done

      - name: Run performance tests (baseline)
        working-directory: backend/performance
        run: |
          mkdir -p results/baseline
          ./run.sh smoke
          ./run.sh lifecycle -v 5 -n 10
          cp -r results/latest/* results/baseline/ 2>/dev/null || true

      - name: Save baseline results
        run: cp -r backend/performance/results /tmp/results-baseline

      - name: Stop backend
        run: |
          pkill -f "app.main" || true
          sleep 2

      - name: Clean untracked files
        run: git clean -fd

      # -------------------------------------------------------------------------
      # Run performance tests on PR branch (after change)
      # -------------------------------------------------------------------------

      - name: Checkout PR branch
        run: |
          git checkout ${{ github.event.pull_request.head.sha }}

      - name: Restore baseline results
        run: cp -r /tmp/results-baseline backend/performance/results

      - name: Start backend (PR branch)
        working-directory: backend
        run: |
          clojure -M:dev -m app.main &
          # Wait for backend to be ready
          for i in $(seq 1 30); do
            if curl -s http://localhost:6060/api/rpc/command/get-profile > /dev/null 2>&1; then
              echo "Backend ready"
              break
            fi
            echo "Waiting for backend... ($i/30)"
            sleep 2
          done

      - name: Run performance tests (current)
        working-directory: backend/performance
        run: |
          mkdir -p results/current
          ./run.sh smoke
          ./run.sh lifecycle -v 5 -n 10
          # Copy results
          cp -r results/latest/* results/current/ 2>/dev/null || true

      - name: Stop backend
        run: |
          pkill -f "app.main" || true
          sleep 2

      # -------------------------------------------------------------------------
      # Compare results
      # -------------------------------------------------------------------------

      - name: Compare results
        working-directory: backend/performance
        run: |
          BASELINE=$(find results/baseline -name "k6-summary.json" | head -1)
          CURRENT=$(find results/current -name "k6-summary.json" | head -1)

          if [ -z "$BASELINE" ] || [ -z "$CURRENT" ]; then
            echo "Warning: Could not find k6 summary files"
            echo "Baseline: $BASELINE"
            echo "Current: $CURRENT"
            exit 0
          fi

          echo "Comparing:"
          echo "  Baseline: $BASELINE"
          echo "  Current:  $CURRENT"
          echo ""

          node scripts/compare-results.cjs "$BASELINE" "$CURRENT" --threshold 20

      # -------------------------------------------------------------------------
      # Upload artifacts
      # -------------------------------------------------------------------------

      - name: Upload results
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: performance-results
          path: backend/performance/results/
          retention-days: 30