name: flatgit CI

on:
  workflow_dispatch:
  push:
    branches: ["main"]
    tags: ["v*"]
  pull_request:
    branches: ["main"]

permissions:
  contents: read

jobs:
  build:
    name: Go build and test
    runs-on: ubuntu-latest

    steps:
      - &checkout
        uses: actions/checkout@v4

      - name: Set up Go
        uses: actions/setup-go@v5
        with:
          go-version: "1.26.x"
          cache: true

      - name: Test
        run: go test ./...

      - name: Vet
        run: go vet ./...

      - name: Build
        run: go build -trimpath -o ./bin/flatgit ./cmd/flatgit

      - name: Smoke test
        run: ./bin/flatgit version

  docker:
    name: Docker image
    runs-on: ubuntu-latest

    needs:
      - build

    if: startsWith(github.ref, 'refs/tags/v')

    permissions:
      contents: read
      packages: write

    steps:
      - *checkout

      - &set_build_version
        name: Set build version
        id: set_build_version
        shell: bash
        run: |
          set -eu

          if [ "${GITHUB_REF_TYPE:-}" = "tag" ]; then
            BUILD_VER="${GITHUB_REF_NAME}"
          else
            BUILD_VER="dev-${GITHUB_SHA::12}"
          fi

          echo "BUILD_VER=${BUILD_VER}" >> "$GITHUB_ENV"
          echo "build_ver=${BUILD_VER}" >> "$GITHUB_OUTPUT"
          echo "Build version: ${BUILD_VER}"

      - &set_image_name
        name: Set image name
        shell: bash
        run: |
          set -eu

          image="ghcr.io/${GITHUB_REPOSITORY}"
          image="${image,,}"

          echo "IMAGE_NAME=${image}" >> "$GITHUB_ENV"
          echo "Image name: ${image}"

      - &setup_buildx
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v4

      - &login_ghcr
        name: Login to GHCR
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ github.token }}

      - name: Docker metadata
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: ${{ env.IMAGE_NAME }}
          tags: |
            type=raw,value=${{ env.BUILD_VER }}-debian-slim
            type=raw,value=latest-debian-slim,enable=${{ startsWith(github.ref, 'refs/tags/v') }}

      - name: Build and push image
        uses: docker/build-push-action@v7
        with:
          context: .
          file: ./dockerfiles/github.Dockerfile
          platforms: linux/amd64,linux/arm64
          push: true
          build-args: |
            BUILD_VER=${{ env.BUILD_VER }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}