name: CI

on:
  push:
    branches: [main]
  pull_request:

jobs:
  changes:
    name: Detect changes
    runs-on: ubuntu-latest
    permissions:
      pull-requests: read
    outputs:
      go: ${{ steps.filter.outputs.go }}
    steps:
      - uses: actions/checkout@v6
      - uses: dorny/paths-filter@v3
        id: filter
        with:
          filters: |
            go:
              - '**.go'
              - 'go.mod'
              - 'go.sum'
              - '.golangci.yml'
              - 'Makefile'
              - '.github/workflows/**'

  lint:
    name: Lint
    needs: changes
    if: needs.changes.outputs.go == 'true'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6

      - uses: actions/setup-go@v5
        with:
          go-version: stable

      - name: Cache Go modules
        uses: actions/cache@v5
        with:
          path: ~/go/pkg/mod
          key: ${{ runner.os }}-go-mod-${{ hashFiles('**/go.sum') }}
          restore-keys: |
            ${{ runner.os }}-go-mod-

      - name: Run golangci-lint
        uses: golangci/golangci-lint-action@v9
        with:
          version: v2.10.1

  test:
    name: Test
    needs: changes
    if: needs.changes.outputs.go == 'true'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6

      - uses: actions/setup-go@v5
        with:
          go-version: stable

      - name: Cache Go modules
        uses: actions/cache@v5
        with:
          path: ~/go/pkg/mod
          key: ${{ runner.os }}-go-mod-${{ hashFiles('**/go.sum') }}
          restore-keys: |
            ${{ runner.os }}-go-mod-

      - name: Cache Go build cache
        uses: actions/cache@v5
        with:
          path: ~/.cache/go-build
          key: ${{ runner.os }}-go-build-${{ hashFiles('**/go.sum') }}
          restore-keys: |
            ${{ runner.os }}-go-build-

      - name: Run tests
        run: go test -race -v ./...