name: "Build and Push Images"

on:
  workflow_dispatch:
    inputs:
      app:
        type: string
        description: "App to build, e.g. 'home-assistant'"
        required: true

jobs:
  #################################################################
  # 1) Collect channel/platform JSON -> Upload artifact
  #################################################################
  matrix:
    runs-on: ubuntu-22.04
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - id: export-channels
        name: Read channels from metadata.yaml
        shell: bash
        run: |
          # Path to the directory with metadata.yaml
          context_dir="/workspace/pub/containers/apps/${{ github.event.inputs.app }}"
          metadata_file="$context_dir/metadata.yaml"

          # If metadata.yaml doesn't exist, fail early
          if [ ! -f "$metadata_file" ]; then
            echo "metadata.yaml not found at $metadata_file"
            exit 1
          fi

          echo "Parsing channels from $metadata_file..."

          channel_count=$(yq '.channels | length' "$metadata_file")
          result="["
          for i in $(seq 0 $((channel_count - 1))); do
            channel_name=$(yq ".channels[$i].name" "$metadata_file")
            platform_count=$(yq ".channels[$i].platforms | length" "$metadata_file")

            for j in $(seq 0 $((platform_count - 1))); do
              platform=$(yq ".channels[$i].platforms[$j]" "$metadata_file")
              # Append JSON object
              result="${result}{\"channel\":${channel_name},\"platform\":${platform}},"
            done
          done
          # Remove trailing comma
          result="${result%,}]"

          echo "Channel/Platform matrix: $result"
          echo "$result" > matrix.json

      - name: Upload matrix artifact
        uses: actions/upload-artifact@v3
        with:
          name: matrix
          path: matrix.json

  #################################################################
  # 2) Download + parse matrix artifact -> set output
  #################################################################
  check-matrix:
    runs-on: ubuntu-22.04
    needs: [ matrix ]
    outputs:
      matrix: ${{ steps.extract.outputs.matrix }}
    steps:
      - uses: actions/download-artifact@v3
        with:
          name: matrix

      - id: extract
        name: Read matrix.json
        shell: bash
        run: |
          # Using jq to "compact" the JSON into one line:
          matrix="$(jq -c . matrix.json)"
          echo "::set-output name=matrix::$matrix"

  #################################################################
  # 3) For each (channel, platform) combination -> build & push
  #################################################################
  build-and-push:
    runs-on: ubuntu-22.04
    needs: [ check-matrix ]
    strategy:
      fail-fast: false
      matrix:
        # Convert the string output from check-matrix back to a JSON array
        includes: ${{ fromJSON(needs.check-matrix.outputs.matrix) }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - id: set-context
        name: Determine Context
        run: |
          # We'll reuse the same directory from job #1
          context_dir="/workspace/pub/containers/apps/${{ github.event.inputs.app }}"
          echo "context_dir=$context_dir" >> "$GITHUB_OUTPUT"

      - id: read-version
        name: Read Version from version.sh
        run: |
          version=$(bash "${{ steps.set-context.outputs.context_dir }}/ci/version.sh" || echo "")
          echo "Building channel '${{ matrix.channel }}' with platform '${{ matrix.platform }}'"
          echo "Version: $version"
          echo "version=$version" >> "$GITHUB_OUTPUT"

      - name: Build and Push with Kaniko
        uses: https://code.252.no/pub/kaniko-action@latest
        with:
          context: ${{ steps.set-context.outputs.context_dir }}
          destinations: >
            code.252.no/${{ github.repository }}/${{ github.event.inputs.app }}:${{ matrix.channel }}
            code.252.no/${{ github.repository }}/${{ github.event.inputs.app }}:${{ steps.read-version.outputs.version }}
          build_args: |
            TARGETPLATFORM=${{ matrix.platform }}
            VERSION=${{ steps.read-version.outputs.version }}
          credentials: "code.252.no=tommy:${{ secrets.REGISTRY_TOKEN }}"
          push: "true"
          cache: "false"