name: docker

on:
  pull_request:
  push:
    branches:
      - "**"
    tags:
      - "v*"
  workflow_dispatch:

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  docker-ci:
    name: Build Docker image
    runs-on: ubuntu-latest
    permissions:
      contents: read
    steps:
      - name: Check out code
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Build test image
        uses: docker/build-push-action@v7
        with:
          context: .
          load: true
          tags: wiregold:test
          build-args: |
            VERSION=ci-${{ github.sha }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Smoke test help output
        run: docker run --rm wiregold:test -h

      - name: Smoke test key generation
        run: docker run --rm wiregold:test -g

      - name: Smoke test preshared key generation
        run: docker run --rm wiregold:test -pg

      - name: Smoke test missing TUN message
        run: |
          set -euo pipefail
          output="$(docker run --rm wiregold:test 2>&1 || true)"
          printf '%s\n' "$output"
          printf '%s' "$output" | grep -F "WireGold requires /dev/net/tun inside the container."

  docker-publish:
    name: Publish GHCR image
    runs-on: ubuntu-latest
    needs: docker-ci
    if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v') || github.ref == format('refs/heads/{0}', github.event.repository.default_branch))
    permissions:
      contents: read
      packages: write
    steps:
      - name: Check out code
        uses: actions/checkout@v4

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to GHCR
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=sha
            type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') || github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}
          labels: |
            org.opencontainers.image.title=WireGold
            org.opencontainers.image.description=Container image for WireGold, a pure-Go Layer 3 VPN inspired by WireGuard.

      - name: Build and push Docker image
        id: push
        uses: docker/build-push-action@v7
        with:
          context: .
          push: true
          platforms: linux/amd64,linux/arm64
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          annotations: ${{ steps.meta.outputs.annotations }}
          build-args: |
            VERSION=${{ steps.meta.outputs.version }}
          cache-from: type=gha
          cache-to: type=gha,mode=max