# Publish the container image to GHCR.
#
# FIRST RUN: a package GHCR creates for the first time is private, even in a
# public repository. Set it to public by hand under the package's settings
# and check with a logged-out `docker pull`.
#
# Two architectures, each built on its own native runner rather than under
# QEMU (`ubuntu-24.04-arm` is free for public repositories). Each runner
# pushes an untagged image by digest and a final job joins the two into one
# multi-arch tag.
name: Publish image

on:
  release:
    types: [published]
  workflow_dispatch:
    inputs:
      ref:
        description: "Tag, branch or SHA to build"
        required: true
        default: main
      tag_latest:
        description: "Also move :latest to this build"
        type: boolean
        default: false

env:
  IMAGE: ghcr.io/coffey-labs/ihasvpn

jobs:
  version:
    runs-on: ubuntu-latest
    outputs:
      version: ${{ steps.v.outputs.version }}
    steps:
      - uses: actions/checkout@v7
        with:
          ref: ${{ inputs.ref || github.ref }}
          fetch-depth: 0
      - id: v
        run: |
          V="$(git describe --tags --always --dirty)"
          V="${V#v}"
          echo "version=$V" >> "$GITHUB_OUTPUT"
          echo "version $V"

  build:
    needs: version
    runs-on: ${{ matrix.runner }}
    permissions:
      contents: read
      packages: write
    strategy:
      fail-fast: false
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
          - platform: linux/arm64
            runner: ubuntu-24.04-arm
    steps:
      - uses: actions/checkout@v7
        with:
          ref: ${{ inputs.ref || github.ref }}
      - uses: docker/setup-buildx-action@v4
      - uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build and push by digest
        id: push
        uses: docker/build-push-action@v7
        with:
          context: .
          platforms: ${{ matrix.platform }}
          build-args: IHASVPN_VERSION=${{ needs.version.outputs.version }}
          provenance: false
          sbom: false
          cache-from: type=gha,scope=${{ matrix.platform }}
          cache-to: type=gha,mode=max,scope=${{ matrix.platform }}
          outputs: type=image,name=${{ env.IMAGE }},push-by-digest=true,name-canonical=true,push=true
      - name: Save the digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.push.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"
      - uses: actions/upload-artifact@v7
        with:
          name: digest-${{ strategy.job-index }}
          path: /tmp/digests/*
          retention-days: 1
          if-no-files-found: error

  publish:
    needs: [version, build]
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - uses: actions/download-artifact@v8
        with:
          path: /tmp/digests
          pattern: digest-*
          merge-multiple: true
      - uses: docker/setup-buildx-action@v4
      - uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Create the manifest
        run: |
          tags=(-t "${IMAGE}:${{ needs.version.outputs.version }}")
          if [ "${{ github.event_name }}" = "release" ] && [ "${{ github.event.release.prerelease }}" = "false" ]; then
            tags+=(-t "${IMAGE}:latest")
          elif [ "${{ inputs.tag_latest }}" = "true" ]; then
            tags+=(-t "${IMAGE}:latest")
          fi
          refs=()
          for f in /tmp/digests/*; do
            refs+=("${IMAGE}@sha256:$(basename "$f")")
          done
          docker buildx imagetools create "${tags[@]}" "${refs[@]}"
      - name: Show what landed
        run: docker buildx imagetools inspect "${IMAGE}:${{ needs.version.outputs.version }}"