# Tests on the three desktop platforms, on every pull request and every push to main (gap 9).
#
# - Linux runs `cargo xtask ci`, the same gate contributors run before a commit (fmt, clippy,
#   heif, tests, parity, layers, assets, wasm), so whatever is added to it is checked here too.
# - macOS and Windows run what differs per platform: clippy and the workspace tests (code behind
#   `cfg(target_os)` only compiles there; issue #989). fmt, parity, layers, assets and wasm give
#   the same answer everywhere, so they run once, on Linux.
# - The GPU tests (CPU <-> GPU equivalence, fallback, memory, shutdown) skip when there is no GPU
#   adapter. Linux and Windows runners have no GPU: `LIGHTCRAFT_GPU_ALLOW_SOFTWARE=1` (tests only;
#   the app refuses software adapters) lets them use Mesa's lavapipe on Linux and WARP (DX12) on
#   Windows. macOS runners expose a Metal device. The GPU step fails if the tests skip anyway
#   (`skipped: no GPU adapter`, or `skipped (gpu): ...` from lightcraft-testkit's `skip!`, #1037).
#   On macOS and Windows it names the test targets with `--workspace`, which reuses the build of
#   the test step (under a minute of building). On Linux, after `cargo xtask ci`, the same command
#   rebuilt about 190 crates (7 min), so it runs `lightcraft-gpu`'s tests only (about 2 min).
#
# Standard GitHub-hosted runners only: free for public repositories. Never a larger runner here
# (release.yml's macos-15-xlarge is budget-capped).
name: CI

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

concurrency:
  group: ci-${{ github.ref }}
  cancel-in-progress: true

permissions:
  contents: read

env:
  CARGO_TERM_COLOR: always
  CARGO_INCREMENTAL: 0
  # what `cargo xtask ci` uses: backtraces with line numbers, a fraction of full debuginfo's RAM and cache
  CARGO_PROFILE_DEV_DEBUG: line-tables-only
  RUST_BACKTRACE: 1

jobs:
  linux:
    name: Linux x86_64 (xtask ci, GPU tests on lavapipe)
    runs-on: ubuntu-latest
    timeout-minutes: 90
    env:
      CRAFT_FONTS_DIR: ${{ github.workspace }}/craft-fonts
      CRAFT_FONTS_REQUIRED: "1"
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
      # Optional font build input, so the Japanese and Chinese font tests run (they skip without it).
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          repository: storytold/craft-fonts
          ref: 8dcdacd5153e64560d109541a47d806f26f048c0 # bump deliberately
          path: craft-fonts
      - name: Install system libraries and Mesa's Vulkan drivers (lavapipe)
        run: |
          sudo apt-get update
          sudo apt-get install -y --no-install-recommends \
            libxkbcommon-dev libwayland-dev libx11-dev libxrandr-dev libxi-dev libgl1-mesa-dev \
            mesa-vulkan-drivers libvulkan1
      - uses: dtolnay/rust-toolchain@686976e191b89faba57d3206551f0f330d8cb249 # stable
        with:
          components: rustfmt, clippy
          targets: wasm32-unknown-unknown
      # Dependencies only (rust-cache drops the workspace's own artifacts), saved from main and
      # restored by pull requests, so the 10 GB cache holds one entry per job.
      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
        with:
          key: ci
          save-if: ${{ github.ref == 'refs/heads/main' }}
      - name: cargo xtask ci
        run: cargo xtask ci
      - name: GPU tests on a software adapter
        if: ${{ !cancelled() }}
        shell: bash
        env:
          LIGHTCRAFT_GPU_ALLOW_SOFTWARE: "1"
        run: |
          cargo test -p lightcraft-gpu --locked --tests -- --nocapture 2>&1 | tee "$RUNNER_TEMP/gpu-tests.log"
          if grep -qE "skipped( \(gpu\))?: no GPU adapter" "$RUNNER_TEMP/gpu-tests.log"; then
            echo "::error::the GPU tests skipped: the runner offered no GPU adapter"
            exit 1
          fi

  desktop:
    name: ${{ matrix.name }}
    runs-on: ${{ matrix.runner }}
    timeout-minutes: 90
    strategy:
      fail-fast: false
      matrix:
        include:
          - { name: "macOS arm64 (clippy, test, GPU tests on Metal)", runner: macos-latest }
          - { name: "Windows x86_64 (clippy, test, GPU tests on WARP)", runner: windows-latest }
    env:
      CRAFT_FONTS_DIR: ${{ github.workspace }}/craft-fonts
      CRAFT_FONTS_REQUIRED: "1"
    steps:
      # Check files out as committed: tests compare bytes of fixtures and docs.
      - name: Keep line endings
        run: git config --global core.autocrlf false
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          repository: storytold/craft-fonts
          ref: 8dcdacd5153e64560d109541a47d806f26f048c0 # bump deliberately
          path: craft-fonts
      - uses: dtolnay/rust-toolchain@686976e191b89faba57d3206551f0f330d8cb249 # stable
        with:
          components: clippy
      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
        with:
          key: ci
          save-if: ${{ github.ref == 'refs/heads/main' }}
      - name: cargo clippy
        run: cargo clippy --workspace --all-targets --locked -- -D warnings
      # every failing test binary, not only the first: platform failures tend to come in groups
      - name: cargo test
        if: ${{ !cancelled() }}
        run: cargo test --workspace --locked --no-fail-fast
      - name: GPU tests on a software adapter
        if: ${{ !cancelled() }}
        shell: bash
        env:
          LIGHTCRAFT_GPU_ALLOW_SOFTWARE: "1"
        run: |
          cargo test --workspace --locked --test equivalence --test fallback --test memory \
            --test shutdown --test shutdown_first -- --nocapture 2>&1 | tee "$RUNNER_TEMP/gpu-tests.log"
          if grep -qE "skipped( \(gpu\))?: no GPU adapter" "$RUNNER_TEMP/gpu-tests.log"; then
            echo "::error::the GPU tests skipped: the runner offered no GPU adapter"
            exit 1
          fi