name: CI

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main

jobs:
  build-and-test:
    name: Build and Test
    strategy:
      matrix:
        os: [ubuntu-latest, macOS-latest]
    runs-on: ${{ matrix.os }}
    steps:
      - uses: actions/checkout@v6
        with:
          submodules: recursive
      - id: hashes
        name: Compute cache hashes
        run: |
          echo "nbs=$(git rev-parse HEAD:vendor/nimbus-build-system)" >> $GITHUB_OUTPUT
          echo "libchat=$(git rev-parse HEAD:vendor/libchat)" >> $GITHUB_OUTPUT
      # Cache the Nim compiler built by nimbus-build-system (NBS).
      # Building Nim from source is the slowest part of `make update`.
      # Keyed on the NBS submodule commit — auto-invalidates when NBS is bumped.
      - name: Cache/restore NBS
        uses: actions/cache@v4
        with:
          path: vendor/nimbus-build-system/vendor/Nim
          key: ${{ runner.os }}-nbs-${{ steps.hashes.outputs.nbs }}
      - name: Cache/restore Cargo registry
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
          key: ${{ runner.os }}-cargo-deps-${{ hashFiles('vendor/libchat/Cargo.lock') }}
          restore-keys: |
            ${{ runner.os }}-cargo-deps-
      - name: Cache/restore libchat
        uses: actions/cache@v4
        with:
          path: vendor/libchat/target
          key: ${{ runner.os }}-libchat-${{ steps.hashes.outputs.libchat }}
      - name: Update dependencies
        run: make update
      - name: Build
        run: make all
      - name: Test
        run: make tests

  nix-build:
    name: Nix Build
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
        with:
          submodules: recursive
      - uses: cachix/install-nix-action@v27
        with:
          nix_path: nixpkgs=channel:nixos-unstable
          extra_nix_config: |
            experimental-features = nix-command flakes
      - name: Build
        run: nix build ".?submodules=1#" --print-build-logs
      - name: Verify outputs
        run: |
          test -f result/lib/liblogoschat.so
          test -f result/include/liblogoschat.h