name: Linux CI

on:
  push:
    branches: ["main"]
    # only run when backend source changes
    # cmd/ is excluded because it contains utilities without tests
    paths:
      - "**/*.go"
      - "!cmd/**"
      - "go.mod"
      - "go.sum"
      - "Makefile"
      - ".github/workflows/go-ci.yml"

  pull_request:
    branches: ["main"]
    paths:
      - "**/*.go"
      - "!cmd/**"
      - "go.mod"
      - "go.sum"
      - "Makefile"
      - ".github/workflows/go-ci.yml"

  # Allows manual triggering of the workflow
  workflow_dispatch:

jobs:
  run-tests:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Set up Go
        uses: actions/setup-go@v4
        with:
          go-version-file: go.mod

      # Only run in this linux based runner
      - name: Check Formatting
        run: |
          if [ "$(gofmt -l . | grep -v 'event/.*_test.go' | wc -l)" -gt 0 ]; then
            gofmt -l . | grep -v 'event/.*_test.go'
            exit 1
          fi
      # cache simple-responder to save the build time
      - name: Restore Simple Responder
        id: restore-simple-responder
        uses: actions/cache/restore@v4
        with:
          path: ./build
          key: ${{ runner.os }}-simple-responder-${{ hashFiles('cmd/simple-responder/simple-responder.go') }}

      # necessary for testing proxy/Process swapping
      - name: Create simple-responder
        run: make simple-responder

      - name: Save Simple Responder
        # nothing new to save ... skip this step
        if: steps.restore-simple-responder.outputs.cache-hit != 'true'
        id: save-simple-responder
        uses: actions/cache/save@v4
        with:
          path: ./build
          key: ${{ runner.os }}-simple-responder-${{ hashFiles('cmd/simple-responder/simple-responder.go') }}

      - name: Test all
        run: make test-all
