name: Build Godot Project (Linux)
on: [push]

jobs:
  build-linux:
    runs-on: ubuntu-latest

    steps:
      - name: Check out repository code
        uses: actions/checkout@v4

      # Step 1: Read project.godot ahead of time to get the version for our cache key
      - name: Detect Godot Version
        id: detect-version
        run: |
          echo "🔍 Parsing project.godot to identify the target engine version..."
          VERSION_SHORT=$(grep "config/features" project.godot | sed -E 's/^[^\"]*\"([^\"]+)\".*/\1/' | xargs)
          
          if [ -z "$VERSION_SHORT" ]; then
            VERSION_SHORT="4.7"
          fi
          
          echo "VERSION_SHORT=${VERSION_SHORT}" >> $GITHUB_OUTPUT
          echo "VERSION_URL=${VERSION_SHORT}-stable" >> $GITHUB_OUTPUT
          echo "VERSION_FILE=${VERSION_SHORT}.stable" >> $GITHUB_OUTPUT
          echo "🎯 Detected Target Version: $VERSION_SHORT"

      # Step 2: Look for the cached Godot folder inside the Gitea Actions cache
      - name: Cache Godot Engine and Templates
        id: godot-cache
        uses: actions/cache@v4
        with:
          path: .godot-cache-storage
          key: godot-${{ steps.detect-version.outputs.VERSION_FILE }}-linux-v1

      # Step 3: Run only on a Cache Miss to download the engine files
      - name: Download Godot Engine and Templates (On Cache Miss)
        if: steps.godot-cache.outputs.cache-hit != 'true'
        run: |
          VERSION_URL="${{ steps.detect-version.outputs.VERSION_URL }}"
          mkdir -p .godot-cache-storage
          
          echo "📥 Cache Miss. Downloading Godot Engine ($VERSION_URL)..."
          curl -L "https://github.com/godotengine/godot/releases/download/${VERSION_URL}/Godot_v${VERSION_URL}_linux.x86_64.zip" -o godot.zip
          unzip godot.zip
          move "Godot_v${VERSION_URL}_linux.x86_64" .godot-cache-storage/godot || mv "Godot_v${VERSION_URL}_linux.x86_64" .godot-cache-storage/godot
          chmod +x .godot-cache-storage/godot

          echo "📥 Downloading Export Templates ($VERSION_URL)..."
          curl -L "https://github.com/godotengine/godot/releases/download/${VERSION_URL}/Godot_v${VERSION_URL}_export_templates.tpz" -o templates.zip
          unzip templates.zip
          mv templates/linux_release.x86_64 .godot-cache-storage/linux_release.x86_64
          
          # Clean up download archives
          rm godot.zip templates.zip
          rm -rf templates/

      # Step 4: Always map the binaries from our local workspace folder into their final execution paths
      - name: Map Engine and Templates
        run: |
          VERSION_FILE="${{ steps.detect-version.outputs.VERSION_FILE }}"
          
          # Copy engine executable out to project root
          cp .godot-cache-storage/godot ./godot
          
          # Inject template into user profile folder where Godot looks for them during exports
          mkdir -p ~/.local/share/godot/export_templates/${VERSION_FILE}
          cp .godot-cache-storage/linux_release.x86_64 ~/.local/share/godot/export_templates/${VERSION_FILE}/linux_release.x86_64
          echo "🚀 Environment ready for export!"

      # Step 5: Export the binary
      - name: Export Linux Binary
        run: |
          mkdir -p build/linux
          ./godot --headless --export-release "Linux" build/linux/godot_number_factory.x86_64

      # Step 6: Upload artifacts using Gitea-compatible v3 action
      - name: Upload Linux Build Artifact
        uses: actions/upload-artifact@v3
        with:
          name: linux-build
          path: build/linux/