name: Export projects to HTML5 and deploy to GitHub Pages
on:
  push:
    branches:
      - master

env:
  GODOT_VERSION: 3.3.3

jobs:
  export-html5:
    name: Export projects to HTML5 and deploy to GitHub Pages
    runs-on: ubuntu-20.04
    container:
      image: barichello/godot-ci:3.3.3
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Setup
        run: |
          mkdir -p ~/.local/share/godot/templates/
          mv /root/.local/share/godot/templates/$GODOT_VERSION.stable ~/.local/share/godot/templates/$GODOT_VERSION.stable

      - name: Export projects to HTML5
        run: |
          apt-get update -qq && apt-get install -qqq imagemagick

          # Don't export Mono demos (not supported yet), demos that can't be run in HTML5
          # since they're platform-specific or demos that are currently broken in HTML5.
          # Remember to update `.github/dist/footer.html` when updating the list of excluded demos.
          rm -rf \
            2d/hdr/ \
            3d/global_illumination/ \
            3d/voxel/ \
            audio/device_changer/ \
            loading/background_load/ \
            loading/multiple_threads_loading/ \
            loading/threads/ \
            misc/matrix_transform/ \
            mobile/android_iap/ \
            mobile/sensors/ \
            mono/ \
            networking/ \
            plugins/

          for panorama in 3d/material_testers/backgrounds/*.hdr; do
            # Decrease the resolution to get below the 20 MB per-file limit.
            # Otherwise, the website can't be deployed as files larger than 20 MB
            # can't be pushed to GitHub anymore.
            mogrify -resize 75% "$panorama"
          done

          BASEDIR="$PWD"

          # Use absolute paths so that we can `cd` without having to go back to the parent directory manually.
          for demo in */*/; do
            echo ""
            echo "================================"
            echo "Exporting demo $demo..."
            echo "================================"

            mkdir -p "$BASEDIR/.github/dist/$demo"
            cd "$BASEDIR/$demo"

            # Copy an export template preset file configured for HTML5 exporting.
            # This way, we don't have to commit `export_presets.cfg` for each project.
            cp "$BASEDIR/.github/dist/export_presets.cfg" .
            godot --export "HTML5" "$BASEDIR/.github/dist/$demo/index.html"

            # Replace the WASM file with a symbolic link to avoid duplicating files in the pushed branch.
            # (WASM files are identical across projects, but not PCK or HTML files.)
            mv -f "$BASEDIR/.github/dist/$demo/index.wasm" "$BASEDIR/.github/dist/index.wasm"
            # The symlink must be relative as it needs to point to a file within the pushed repository.
            ln -s "../../index.wasm" "$BASEDIR/.github/dist/$demo/index.wasm"

            # Append the demo to the list of demos for the website.
            PROJECT_NAME=$(cat project.godot | grep "config/name" | cut -d '"' -f 2 | tr -d "\n")
            echo "<li><a href='$demo'><img width="64" height="64" src="$demo/favicon.png" alt=""><p>$PROJECT_NAME</p></a></li>" >> "$BASEDIR/.github/dist/demos.html"
          done

          cat "$BASEDIR/.github/dist/header.html" "$BASEDIR/.github/dist/demos.html" "$BASEDIR/.github/dist/footer.html" > "$BASEDIR/.github/dist/index.html"

          # Clean up files that don't need to be deployed.
          rm -f "$BASEDIR/.github/dist/header.html" "$BASEDIR/.github/dist/demos.html" "$BASEDIR/.github/dist/footer.html" "$BASEDIR/.github/dist/export_presets.cfg"

      # Installing rsync is needed in order to deploy to GitHub Pages. Without it, the build will fail.
      - name: Install rsync 📚
        run: |
          apt-get update -qq && apt-get install -qqq rsync
      - name: Deploy to GitHub Pages 🚀
        uses: JamesIves/github-pages-deploy-action@releases/v3
        with:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          # The branch the action should deploy to.
          BRANCH: gh-pages
          # The folder the action should deploy.
          FOLDER: .github/dist
          # Artifacts are large; don't keep the branch's history.
          SINGLE_COMMIT: true