name: Go PR Checks

on:
  - pull_request

concurrency:
  group: pr-go-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

jobs:
  cache:
    name: Setup cache
    runs-on: ubuntu-latest
    outputs:
      go-changes: ${{ steps.changed-files.outputs.any_changed }}
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - name: Get changed go files
        id: changed-files
        uses: tj-actions/changed-files@v35
        with:
          files: |
            *.go
            *.mod
            *.sum
            **/*.go
            **/*.mod
            **/*.sum
      - name: List all changed files
        run: |
          for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
            echo "$file was changed"
          done
      - name: Setup Go Cache
        uses: actions/cache@v3
        if: steps.changed-files.outputs.any_changed == 'true'
        with:
          path: |
            ~/.cache/go-build
            ~/go/pkg/mod
          key: porter-go-${{ hashFiles('**/go.sum') }}
          restore-keys: porter-go-
      - uses: actions/setup-go@v4
        if: steps.changed-files.outputs.any_changed == 'true'
        with:
          cache: false
          go-version-file: go.mod
      - name: Download Go Modules
        if: steps.changed-files.outputs.any_changed == 'true'
        run: go mod download

  testing_matrix:
    name: Running Go Tests
    runs-on: ${{ matrix.os }}
    needs: cache
    strategy:
      matrix:
        os: [ubuntu-latest]
        folder: [cli, api, cmd, internal, provisioner]
    steps:
      - uses: actions/checkout@v3
      - name: Setup Go Cache
        uses: actions/cache/restore@v3
        if: needs.cache.outputs.go-changes == 'true'
        with:
          path: |
            ~/.cache/go-build
            ~/go/pkg/mod
          key: porter-go-${{ hashFiles('**/go.sum') }}
      - uses: actions/setup-go@v4
        if: needs.cache.outputs.go-changes == 'true'
        with:
          cache: false
          go-version-file: go.mod
      - name: Download Go Modules
        if: needs.cache.outputs.go-changes == 'true'
        run: go mod download
      - name: Run Go tests
        if: needs.cache.outputs.go-changes == 'true'
        run: go test ./${{ matrix.folder }}/... -count 1

  linting:
    name: Go Linter
    runs-on: ubuntu-latest
    needs: cache
    steps:
      - uses: actions/checkout@v3
      - name: Setup Go Cache
        uses: actions/cache/restore@v3
        if: needs.cache.outputs.go-changes == 'true'
        with:
          path: |
            ~/.cache/go-build
            ~/go/pkg/mod
          key: porter-go-${{ hashFiles('**/go.sum') }}
      - uses: actions/setup-go@v4
        if: needs.cache.outputs.go-changes == 'true'
        with:
          cache: false
          go-version-file: go.mod
      - name: golangci-lint
        uses: golangci/golangci-lint-action@v3
        if: needs.cache.outputs.go-changes == 'true'
        with:
          version: latest
          args: -c .github/golangci-lint.yaml --verbose
          skip-pkg-cache: true
          only-new-issues: true # this is needed until the following is merged: https://github.com/golangci/golangci-lint-action/issues/820