name: Builder

env:
  BUILD_ARGS: "--test"
  MONITORED_FILES: "build.json config.json Dockerfile rootfs"

on:
  push:
    branches:
      - master
  pull_request:
    branches:
      - master

jobs:
  init:
    runs-on: ubuntu-latest
    name: Initialize builds
    outputs:
      changed_files: ${{ steps.changed_files.outputs.all }}
      changed_addons: ${{ steps.changed_addons.outputs.addons }}
      changed: ${{ steps.changed_addons.outputs.changed }}
    steps:
      - name: Check out the repository
        uses: actions/checkout@v2.3.4

      - name: Get changed files
        id: changed_files
        uses: jitterbit/get-changed-files@v1

      - name: Get add-ons
        id: addons
        run: |
          declare -a addons
          for addon in $(find ./ -name config.json | cut -d "/" -f2 | sort -u); do
            addons+=("$addon");
          done
          echo "::set-output name=addons::${addons[@]}"
      - name: Get changed add-ons
        id: changed_addons
        run: |
          declare -a changed_addons
          for addon in ${{ steps.addons.outputs.addons }}; do
            if [[ "${{ steps.changed_files.outputs.all }}" =~ $addon ]]; then
              for file in ${{ env.MONITORED_FILES }}; do
                  if [[ "${{ steps.changed_files.outputs.all }}" =~ $addon/$file ]]; then
                    if [[ ! "${changed_addons[@]}" =~ $addon ]]; then
                      changed_addons+=("\"${addon}\",");
                    fi
                  fi
              done
            fi
          done
          changed=$(echo ${changed_addons[@]} | rev | cut -c 2- | rev)
          if [[ -n ${changed} ]]; then
            echo "Changed add-ons: $changed";
            echo "::set-output name=changed::true";
            echo "::set-output name=addons::[$changed]";
          else
            echo "No add-on had any monitored files changed (${{ env.MONITORED_FILES }})";
          fi
  build:
    needs: init
    runs-on: ubuntu-latest
    if: needs.init.outputs.changed == 'true'
    name: Build ${{ matrix.arch }} ${{ matrix.addon }} add-on
    strategy:
      matrix: 
        addon: ${{ fromJson(needs.init.outputs.changed_addons) }}
        arch: ["aarch64", "amd64", "armhf", "armv7", "i386"]

    steps:
      - name: Check out repository
        uses: actions/checkout@v2.3.4

      - name: Get information
        id: info
        uses: home-assistant/actions/helpers/info@master
        with:
          path: "./${{ matrix.addon }}"

      - name: Check add-on
        id: check
        run: |
           if [[ "${{ steps.info.outputs.architectures }}" =~ ${{ matrix.arch }} ]]; then
              echo "::set-output name=build_arch::true";
            else
              echo "${{ matrix.arch }} is not a valid arch for ${{ matrix.addon }}, skipping build";
           fi
           image=$(jq -r '.image' "./${{ matrix.addon }}/config.json" | cut -d"/" -f3)
           echo "::set-output name=image::${image}";

      - name: Set build arguments
        if: steps.check.outputs.build_arch == 'true'
        run: |
          if [[ -z "${{ github.head_ref }}" ]] && [[ "${{ github.event_name }}" == "push" ]]; then
              echo "BUILD_ARGS=" >> $GITHUB_ENV;
          fi

      - name: Login to GitHub Container Registry
        if: env.BUILD_ARGS != '--test'
        uses: docker/login-action@v1.10.0
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build ${{ matrix.addon }} add-on
        if: steps.check.outputs.build_arch == 'true'
        uses: home-assistant/builder@2021.07.0
        with:
          args: |
            ${{ env.BUILD_ARGS }} \
            --${{ matrix.arch }} \
            --target /data/${{ matrix.addon }} \
            --image "${{ steps.check.outputs.image }}" \
            --docker-hub "ghcr.io/${{ github.repository_owner }}" \
            --addon