name: Build ElegooSlicer Container

on:
  workflow_dispatch: 
  push:
    branches:
      - main
  schedule:
    - cron: '0 4 * * *'

permissions:
  contents: read
  packages: write

jobs:
  check-and-build:
    runs-on: docker-runner 
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4

      - name: Determine Registry & Image Path
        id: meta
        run: |
          if [ "${{ github.server_url }}" = "https://github.com" ]; then
            REGISTRY="ghcr.io"
          else
            REGISTRY=$(echo "${{ github.server_url }}" | sed -e 's|^[^/]*/\+/||')
          fi

          IMAGE_NAME=$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]')
          FULL_IMAGE_NAME="$REGISTRY/$IMAGE_NAME"

          echo "registry=$REGISTRY" >> "$GITHUB_OUTPUT"
          echo "full_image_name=$FULL_IMAGE_NAME" >> "$GITHUB_OUTPUT"

      - name: Login to Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.REGISTRY_USER }}
          password: ${{ secrets.REGISTRY_PASSWORD }}

      - name: Check Elegoo Upstream Release & Local Image Tag
        id: check_tag
        run: |
          RELEASE_JSON=$(curl -s https://api.github.com/repos/ELEGOO-3D/ElegooSlicer/releases/latest)
          DOWNLOAD_URL=$(echo "$RELEASE_JSON" | grep -o 'https://[^"]*Linux[^"]*\.AppImage' | head -n 1)
          TAG_NAME=$(echo "$RELEASE_JSON" | grep -o '"tag_name": "[^"]*' | cut -d'"' -f4)

          if [ -z "$DOWNLOAD_URL" ] || [ -z "$TAG_NAME" ]; then
            echo "Error: Could not parse release data"
            exit 1
          fi

          echo "Newest Elegoo-Tag: $TAG_NAME"
          TARGET_IMAGE="${{ steps.meta.outputs.full_image_name }}:$TAG_NAME"

          if docker manifest inspect "$TARGET_IMAGE" > /dev/null 2>&1; then
            echo "Image $TARGET_IMAGE exists in registry"
            echo "build_needed=false" >> "$GITHUB_OUTPUT"
          else
            echo "Image $TARGET_IMAGE does not exist in registry, lets build it"
            echo "build_needed=true" >> "$GITHUB_OUTPUT"
            echo "url=$DOWNLOAD_URL" >> "$GITHUB_OUTPUT"
            echo "tag=$TAG_NAME" >> "$GITHUB_OUTPUT"
          fi

      - name: Set up Docker Buildx
        if: steps.check_tag.outputs.build_needed == 'true' || github.event_name == 'workflow_dispatch'
        uses: docker/setup-buildx-action@v3

      - name: Build and Push
        if: steps.check_tag.outputs.build_needed == 'true' || github.event_name == 'workflow_dispatch'
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          build-args: |
            SLICER_URL=${{ steps.check_tag.outputs.url }}
          tags: |
            ${{ steps.meta.outputs.full_image_name }}:latest
            ${{ steps.meta.outputs.full_image_name }}:${{ steps.check_tag.outputs.tag }}