name: Build VulkanEngine

on:
  push:
    branches:
      - vkguide
  pull_request:
  workflow_dispatch:
  schedule:
    - cron: "0 3 * * 1"

jobs:
  # ---------------------------------------------------------------------------
  # 1. Nix build: validates the flake build and produces the SPIR-V shaders
  #    (SPIR-V is OS independent, and slangc is not packaged in Debian).
  # ---------------------------------------------------------------------------
  nix:
    runs-on: ubuntu-latest
    container: git.alexdelcamp.fr/alexandre_1a/flake-actions:latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          submodules: recursive
          fetch-depth: 0

      - name: Configure
        run: |
          nix develop --command cmake -S . -B build \
            -G Ninja \
            -DCMAKE_BUILD_TYPE=Release

      - name: Build
        run: |
          nix develop --command cmake --build build --parallel 2

      - name: Upload shaders
        uses: actions/upload-artifact@v4
        with:
          name: shaders
          path: build/engine/shaders

      - name: Notify progress
        if: always()
        run: |
          curl \
            -H "Title: [Routine] Shaders" \
            -d "Build finished" \
            https://ntfy.alexdelcamp.fr/FlakeBuild

  # ---------------------------------------------------------------------------
  # 2. Debian 12 builds: portable (static) and bundle (bin/ + lib/)
  #    Built on glibc 2.36 => runs on Debian 12 and anything newer.
  # ---------------------------------------------------------------------------
  release:
    needs: nix
    runs-on: ubuntu-latest
    container: debian:12
    strategy:
      fail-fast: false
      matrix:
        variant: [PORTABLE, BUNDLE]

    steps:
      # git + nodejs must exist before checkout (JS actions run in the container)
      - name: Dependencies
        run: |
          apt-get update
          apt-get install -y --no-install-recommends \
            git ca-certificates nodejs curl \
            build-essential cmake ninja-build pkg-config \
            libwayland-dev libwayland-bin wayland-protocols libxkbcommon-dev \
            libx11-dev libxrandr-dev libxinerama-dev libxcursor-dev libxi-dev

      - name: Checkout
        uses: actions/checkout@v4
        with:
          submodules: recursive
          fetch-depth: 0

      - name: Git safe directory
        run: git config --global --add safe.directory "$GITHUB_WORKSPACE"

      - name: Download shaders
        uses: actions/download-artifact@v4
        with:
          name: shaders
          path: prebuilt-shaders

      - name: Configure
        run: |
          cmake -S . -B build -G Ninja \
            -DCMAKE_BUILD_TYPE=Release \
            -DVULKANENGINE_FETCH_DEPS=ON \
            -DVULKANENGINE_${{ matrix.variant }}=ON \
            -DVULKANENGINE_PREBUILT_SHADERS="$PWD/prebuilt-shaders"

      - name: Build
        run: cmake --build build --parallel 2

      - name: Install
        run: cmake --install build --prefix dist --strip

      - name: Check binaries
        shell: bash
        run: |
          set -euo pipefail
          for b in dist/bin/engine dist/bin/server; do
            echo "========== $b =========="
            readelf -l "$b" | grep 'program interpreter'
            readelf -d "$b" | grep -E 'RPATH|RUNPATH|NEEDED' || true

            if strings "$b" | grep -q '/nix/store'; then
              echo "ERROR: $b references /nix/store"; exit 1
            fi

            # The loader must come from volk (dlopen), never from NEEDED
            if readelf -d "$b" | grep -q 'libvulkan'; then
              echo "ERROR: $b links libvulkan directly"; exit 1
            fi

            if [ "${{ matrix.variant }}" = "PORTABLE" ]; then
              if readelf -d "$b" | grep -Eq 'libstdc\+\+|libgcc_s'; then
                echo "ERROR: $b is not static for libstdc++/libgcc"; exit 1
              fi
            fi

            max=$(objdump -T "$b" | grep -o 'GLIBC_[0-9.]*' | sed 's/GLIBC_//' | sort -uV | tail -1 || true)
            echo "Highest GLIBC symbol: ${max:-none}"
            if [ -n "$max" ] && [ "$(printf '%s\n%s\n' "$max" 2.36 | sort -V | tail -1)" != "2.36" ]; then
              echo "ERROR: needs glibc $max (> 2.36)"; exit 1
            fi

            if ldd "$b" | grep 'not found'; then
              echo "ERROR: unresolved libraries in $b"; exit 1
            fi
          done

          if [ "${{ matrix.variant }}" = "BUNDLE" ]; then
            echo "========== lib/ =========="
            ls -la dist/lib
          fi

      # tar keeps permissions and symlinks; artifact zips do not
      - name: Package
        run: |
          tar -C dist -czf VulkanEngine-${{ matrix.variant }}-linux-x86_64.tar.gz .

      - name: Upload build
        uses: actions/upload-artifact@v4
        with:
          name: VulkanEngine-${{ matrix.variant }}-linux-x86_64
          path: VulkanEngine-${{ matrix.variant }}-linux-x86_64.tar.gz
      - name: Notify progress
        if: failure()
        run: |
          curl \
            -H "Title: [Routine] Engine-${{ matrix.variant }} build" \
            -d "Build failed (nix: ${{ needs.nix.result }}, release: ${{ needs.release.result }})" \
            https://ntfy.alexdelcamp.fr/FlakeBuild

  # ---------------------------------------------------------------------------
  notify:
    needs: [nix, release]
    if: always()
    runs-on: ubuntu-latest
    steps:
      - name: Notify routine
        run: |
          curl \
            -H "Title: [Routine] VulkanEngine build" \
            -d "Build finished (nix: ${{ needs.nix.result }}, release: ${{ needs.release.result }})" \
            https://ntfy.alexdelcamp.fr/FlakeBuild