name: Deploy ImGui WASM to GitHub Pages

on:
  push:
    branches: [master]
    paths:
      - 'imgui.cpp'
      - 'imgui.h'
      - 'imgui_demo.cpp'
      - 'imgui_draw.cpp'
      - 'imgui_tables.cpp'
      - 'imgui_widgets.cpp'
      - 'backends/imgui_impl_sdl2.*'
      - 'backends/imgui_impl_opengl3.*'
      - 'examples/example_sdl2_opengl3/main.cpp'
      - 'examples/example_sdl2_opengl3/Makefile.emscripten'
      - 'examples/libs/emscripten/**'
      - '.github/workflows/deploy-wasm.yml'
  workflow_dispatch:

permissions:
  contents: write
  pages: write

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest
    name: Build ImGui WASM and deploy to gh-pages

    steps:
    - name: Checkout imgui_xl
      uses: actions/checkout@v6

    - name: Install Emscripten
      run: |
        wget -q https://github.com/emscripten-core/emsdk/archive/master.tar.gz
        tar -xzf master.tar.gz
        emsdk-master/emsdk update
        emsdk-master/emsdk install latest
        emsdk-master/emsdk activate latest
        sudo apt-get install build-essential

    - name: Build SDL2+OpenGL3 ImGui WASM
      run: |
        pushd emsdk-master
        source ./emsdk_env.sh
        popd

        # Build with custom shell file (single-file mode: all WASM embedded in one .html)
        # We sed the Makefile to use our custom shell and enable SINGLE_FILE
        cd examples/example_sdl2_opengl3
        sed -i 's|--shell-file ../libs/emscripten/shell_minimal.html|--shell-file ../libs/emscripten/shell_imgui_xl.html|' Makefile.emscripten
        sed -i 's|#LDFLAGS += -sSINGLE_FILE|LDFLAGS += -sSINGLE_FILE|' Makefile.emscripten
        make -f Makefile.emscripten -j$(nproc)

        # Verify output
        echo "=== Build output ==="
        ls -la web/
        echo "=== File size ==="
        du -sh web/index.html

    - name: Deploy to gh-pages
      uses: peaceiris/actions-gh-pages@v4
      with:
        github_token: ${{ secrets.GITHUB_TOKEN }}
        publish_branch: gh-pages
        publish_dir: examples/example_sdl2_opengl3/web
        destination_dir: wasm
        keep_files: true