name: Nix

on:
  push:
    branches:
      - "develop"
      - "release-*"
    tags:
      - "*"
    paths:
      # File types
      - "**.cpp"
      - "**.h"
      - "**.java"

      # Build files
      - "**.nix"
      - "nix/"
      - "flake.lock"

      # Directories
      - "buildconfig/"
      - "cmake/"
      - "launcher/"
      - "libraries/"
      - "program_info/"
      - "tests/"

      # Files
      - "CMakeLists.txt"
      - "COPYING.md"

      # Workflows
      - ".github/workflows/nix.yml"
  pull_request_target:
    paths:
      # File types
      - "**.cpp"
      - "**.h"

      # Build files
      - "**.nix"
      - "nix/"
      - "flake.lock"

      # Directories
      - "buildconfig/"
      - "cmake/"
      - "launcher/"
      - "libraries/"
      - "program_info/"
      - "tests/"

      # Files
      - "CMakeLists.txt"
      - "COPYING.md"

      # Workflows
      - ".github/workflows/nix.yml"
  workflow_dispatch:

permissions:
  contents: read

env:
  DEBUG: ${{ github.ref_type != 'tag' }}
  USE_DETERMINATE: ${{ github.event_name == 'pull_request' }}

jobs:
  build:
    name: Build (${{ matrix.system }})

    strategy:
      fail-fast: false
      matrix:
        include:
          - os: ubuntu-22.04
            system: x86_64-linux

          - os: ubuntu-22.04-arm
            system: aarch64-linux

          - os: macos-13
            system: x86_64-darwin

          - os: macos-14
            system: aarch64-darwin

    runs-on: ${{ matrix.os }}

    permissions:
      id-token: write

    steps:
      - name: Get merge commit
        if: ${{ github.event_name == 'pull_request_target' }}
        id: merge-commit
        uses: PrismLauncher/PrismLauncher/.github/actions/get-merge-commit@develop
        with:
          pull-request-id: ${{ github.event.number }}
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          ref: ${{ steps.merge-commit.outputs.merge-commit-sha || github.sha }}

      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@v17
        with:
          determinate: ${{ env.USE_DETERMINATE }}

        # For PRs
      - name: Setup Nix Magic Cache
        if: ${{ env.USE_DETERMINATE == 'true' }}
        uses: DeterminateSystems/flakehub-cache-action@v2

        # For in-tree builds
      - name: Setup Cachix
        if: ${{ github.event_name == 'push' || github.event_name == 'workflow_dispatch' }}
        uses: cachix/cachix-action@v16
        with:
          name: prismlauncher
          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}

      - name: Run Flake checks
        run: |
          nix flake check --print-build-logs --show-trace

      - name: Build debug package
        if: ${{ env.DEBUG == 'true' }}
        run: |
          nix build \
            --no-link --print-build-logs --print-out-paths \
            .#prismlauncher-debug >> "$GITHUB_STEP_SUMMARY"

      - name: Build release package
        if: ${{ env.DEBUG == 'false' }}
        env:
          TAG: ${{ github.ref_name }}
          SYSTEM: ${{ matrix.system }}
        run: |
          nix build --no-link --print-out-paths .#prismlauncher \
            | tee -a "$GITHUB_STEP_SUMMARY" \
            | xargs cachix pin prismlauncher "$TAG"-"$SYSTEM"