name: Emscripten

on:
  push:
    branches: [develop, main]
  pull_request:
    branches: [develop, main]
  workflow_dispatch:

jobs:
  emscripten:
    name: Emscripten WebAssembly Build
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Setup Emscripten
        uses: mymindstorm/setup-emsdk@v14

      - name: Configure
        run: emcmake cmake -B build-em -S emscripten -DCMAKE_BUILD_TYPE=Release

      - name: Build
        run: cmake --build build-em -j

      - name: Verify artifacts
        run: |
          test -f build-em/chaiscript.js
          test -f build-em/chaiscript.wasm
          test -f build-em/chaiscript.html
          echo "All expected artifacts present"
          ls -lh build-em/chaiscript.*

      - name: Upload artifacts
        uses: actions/upload-artifact@v4
        with:
          name: chaiscript-web
          path: |
            build-em/chaiscript.js
            build-em/chaiscript.wasm
            build-em/chaiscript.html
          retention-days: 90

  publish:
    name: Publish WASM Release
    needs: emscripten
    if: github.ref == 'refs/heads/develop' && github.event_name == 'push'
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/download-artifact@v4
        with:
          name: chaiscript-web
          path: artifacts

      - name: Publish to wasm-latest release
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          # Flatten: artifacts may contain build-em/ subdirectory
          find artifacts -type f \( -name 'chaiscript.js' -o -name 'chaiscript.wasm' -o -name 'chaiscript.html' \) -exec cp {} . \;

          # Delete existing release if present, then recreate
          gh release delete wasm-latest --repo "$GITHUB_REPOSITORY" -y 2>/dev/null || true
          gh release create wasm-latest \
            --repo "$GITHUB_REPOSITORY" \
            --title "ChaiScript WASM Build (latest)" \
            --notes "Auto-published from develop branch. Built with Emscripten for browser use." \
            --prerelease \
            chaiscript.js chaiscript.wasm chaiscript.html