name: "Build and Push Images"

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

jobs:
  #################################################################
  # 1) Parse metadata.yaml -> produce JSON array of (channel, platform) items
  #################################################################
  read-channels:
    runs-on: ci-os
    outputs:
      channels: ${{ steps.export-channels.outputs.channels }}
    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..."

        # First, get the total channel count:
        channel_count=$(cat "$metadata_file" | yq '.channels | length')

        # We'll build the array in bash:
        result="["
        for i in $(seq 0 $((channel_count - 1))); do
          channel_name=$(yq e ".channels[$i].name" "$metadata_file")
          # Number of platforms in this channel:
          platform_count=$(yq e ".channels[$i].platforms | length" "$metadata_file")

          for j in $(seq 0 $((platform_count - 1))); do
            platform=$(yq e ".channels[$i].platforms[$j]" "$metadata_file")

            # Append JSON object
            result="${result}{\"channel\":\"${channel_name}\",\"platform\":\"${platform}\"},"
          done
        done
        # Remove trailing comma
        result="${result%,}]"

        echo "Found channel/platform combinations: $result"

        # Expose as job output for the next job's matrix
        echo "channels=$result" >> "$GITHUB_OUTPUT"

  #################################################################
  # 2) For each (channel, platform) combination -> build & push
  #################################################################
  build-and-push:
    runs-on: ci-os
    needs: read-channels
    strategy:
      fail-fast: false
      matrix:
        include: ${{ fromJSON(needs.read-channels.outputs.channels) }}
        # This means: for each object in the array, we have "matrix.channel" and "matrix.platform"
    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:
        # We pass the directory that holds Dockerfile, metadata.yaml, ci/version.sh, etc.
        context: ${{ steps.set-context.outputs.context_dir }}

        # We'll build two tags:
        #   1) :<channel>
        #   2) :<version>
        # Example: code.252.no/org/repo:stable, code.252.no/org/repo:2023.5.0
        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 }}

        # If your Dockerfile uses ARG TARGETPLATFORM (e.g. in FROM lines), pass it in build_args
        build_args: |
          TARGETPLATFORM=${{ matrix.platform }}
          VERSION=${{ steps.read-version.outputs.version }}

        credentials: "code.252.no=tommy:${{ secrets.REGISTRY_TOKEN }}"
        push: "true"
        cache: "false"