name: Docker

on:
  workflow_dispatch:
    inputs:
      nim_version:
        description: Nim version (2.0.14)
        required: true
        type: string

env:
  DOCKER_FILE: Dockerfile
  DOCKERHUB_REPO: codexstorage/nim-lang
  NIM_VERSION: ${{ inputs.nim_version }}
  amd64_builder: ubuntu-22.04
  arm64_builder: ubuntu-22.04-arm

jobs:
  compute:
    name: Compute matrix
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.matrix.outputs.matrix }}
    steps:
      - name: Compute matrix
        id: matrix
        uses: fabiocaccamo/create-matrix-action@v5
        with:
          matrix: |
            os {linux}, arch {amd64}, builder {${{ env.amd64_builder }}}
            os {linux}, arch {arm64}, builder {${{ env.arm64_builder }}}

  # Build platform specific image
  build:
    needs: compute
    strategy:
      fail-fast: true
      matrix:
        include: ${{ fromJson(needs.compute.outputs.matrix) }}

    name: Build ${{ matrix.os }}/${{ matrix.arch }}
    runs-on: ${{ matrix.builder }}
    env:
      PLATFORM: ${{ format('{0}/{1}', 'linux', matrix.arch) }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Docker - Meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.DOCKERHUB_REPO }}

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

      - name: Docker - Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Docker - Build and Push by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ${{ env.DOCKER_FILE }}
          platforms: ${{ env.PLATFORM }}
          push: true
          build-args: |
            NIM_VERSION=${{ env.NIM_VERSION }}
          labels: ${{ steps.meta.outputs.labels }}
          outputs: type=image,name=${{ env.DOCKERHUB_REPO }},push-by-digest=true,name-canonical=true,push=true

      - name: Docker - Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"

      - name: Docker - Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ matrix.arch }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  # Publish multi-platform image
  publish:
    name: Publish multi-platform image
    runs-on: ubuntu-latest
    needs: build
    steps:

      - name: Docker - Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

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

      - name: Docker - Meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.DOCKERHUB_REPO }}
          tags: ${{ env.NIM_VERSION }}

      - name: Docker - Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Docker - Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.DOCKERHUB_REPO }}@sha256:%s ' *)

      - name: Docker - Inspect image
        run: |
          docker buildx imagetools inspect ${{ env.DOCKERHUB_REPO }}:${{ steps.meta.outputs.version }}