name: CI

on:
  push:
    branches: [main]
  pull_request:

env:
  # Test the module alone, with the versions in go.mod (never a go.work).
  GOWORK: "off"

jobs:
  proto:
    name: Proto
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 0
      - uses: actions/setup-go@v7
        with:
          go-version-file: go.mod
          cache: true
      - uses: bufbuild/buf-action@v1
        with:
          version: 1.73.0
          setup_only: true
      # Skipped until the first .proto file exists: buf fails on an empty module.
      - name: Lint, breaking, generated code up to date
        run: |
          if ! find proto -name '*.proto' -print -quit 2>/dev/null | grep -q .; then
            echo "no .proto files yet"; exit 0
          fi
          buf lint
          if git cat-file -e origin/main:buf.yaml 2>/dev/null && git ls-tree -r --name-only origin/main proto | grep -q '\.proto$'; then
            buf breaking --against '.git#ref=origin/main'
          fi
          buf generate
          git diff --exit-code -- gen

  go:
    name: Go
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - uses: actions/setup-go@v7
        with:
          go-version-file: go.mod
          cache: true
      - name: Verify tidy
        run: |
          go mod tidy
          git diff --exit-code -- go.mod go.sum
      - run: go vet ./...
      - run: go build ./...