name: Deploy to GitHub Pages

on:
  push:
    branches:
      - main
  workflow_dispatch:

permissions:
  contents: read
  pages: write
  id-token: write

concurrency:
  group: "pages"
  cancel-in-progress: false

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup Node
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'

      - name: Install dependencies
        run: npm ci

      - name: Setup emsdk
        uses: mymindstorm/setup-emsdk@v14
        with:
          version: 5.0.4
          actions-cache-folder: 'emsdk-cache'

      # libFLAME + BLIS are built from source (WASM) via the sibling
      # concept-collection/libflame2wasm repo — nothing prebuilt is committed here.
      - name: Clone libflame2wasm (sibling)
        run: |
          git clone --depth 1 https://github.com/concept-collection/libflame2wasm.git "$GITHUB_WORKSPACE/../libflame2wasm"
          LIBFLAME_DIR="$(cd "$GITHUB_WORKSPACE/../libflame2wasm" && pwd)"
          echo "LIBFLAME_DIR=$LIBFLAME_DIR" >> "$GITHUB_ENV"
          echo "LIBFLAME_SHA=$(git -C "$LIBFLAME_DIR" rev-parse HEAD)" >> "$GITHUB_ENV"

      # Cache the four heavy libflame/BLIS static libraries, keyed on the
      # libflame2wasm commit + emsdk version. First build is slow (libflame is
      # compiled twice); afterwards this restores in seconds.
      - name: Cache libflame2wasm libraries
        id: libflame-cache
        uses: actions/cache@v4
        with:
          path: |
            ${{ env.LIBFLAME_DIR }}/install/lib
            ${{ env.LIBFLAME_DIR }}/blis/lib/generic/libblis.a
          key: libflame2wasm-${{ env.LIBFLAME_SHA }}-emsdk5.0.4-v1

      - name: Build libflame2wasm libraries
        if: steps.libflame-cache.outputs.cache-hit != 'true'
        run: bash "$LIBFLAME_DIR/build-all-wasm.sh"

      # Custom C kernels (wasm/dist/matmul.* + public/matmul/matmul_mt.*).
      - name: Build custom wasm kernels
        run: bash wasm/build-wasm.sh

      # libFLAME/BLIS matmul modules (public/matmul/matmul_blis_{st,mt}.*),
      # linked against the libraries built above.
      - name: Build BLIS wasm modules
        run: LIBFLAME="$LIBFLAME_DIR" bash blis/build-blis-wasm.sh

      - name: Build
        run: npm run build

      - name: Upload artifact
        uses: actions/upload-pages-artifact@v3
        with:
          path: ./dist

  deploy:
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    runs-on: ubuntu-latest
    needs: build
    steps:
      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@v4