# Copyright (c) 2021-2022-2023 Luca Cappa
# Released under the term specified in file LICENSE.txt
# SPDX short identifier: MIT

# A "pure" GitHub workflow using CMake, Ninja and vcpkg to build a C/C++ codebase.
# It leverages both CMakePresets.json and vcpkg.json.
# It is called "pure workflow" because it is an example which minimizes the usage of
# custom GitHub Actions, but leverages directly the tools that could be easily run on
# your development machines (i.e. CMake, vcpkg, Ninja) to ensure a perfectly identical
# and reproducible local build (on your development machine) and a remote build on 
# build agents.
name: build-binaries
on:
  workflow_dispatch:

jobs:
  job:
    name: ${{ matrix.os }}-${{ github.workflow }}
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest, windows-latest]
        include:
          - os: windows-latest
            triplet: x64-windows
          - os: ubuntu-latest
            triplet: x64-linux
          - os: macos-latest
            triplet: x64-osx
    env:
      # Indicates the location of the vcpkg as a Git submodule of the project repository.
      VCPKG_ROOT: ${{ github.workspace }}/vendor/vcpkg
      # Tells vcpkg where binary packages are stored.
      VCPKG_DEFAULT_BINARY_CACHE: ${{ github.workspace }}/vendor/vcpkg/bincache
      # Let's use GitHub Action cache as storage for the vcpkg Binary Caching feature.
      VCPKG_BINARY_SOURCES: 'clear;x-gha,readwrite'

    steps:
    # Set env vars needed for vcpkg to leverage the GitHub Action cache as a storage
    # for Binary Caching.
      - uses: actions/github-script@v6
        with:
          script: |
            core.exportVariable('ACTIONS_CACHE_URL', process.env.ACTIONS_CACHE_URL || '');
            core.exportVariable('ACTIONS_RUNTIME_TOKEN', process.env.ACTIONS_RUNTIME_TOKEN || '');

      - uses: actions/checkout@v3
        with:
          submodules: true
      - name: "Create directory '${{ env.VCPKG_DEFAULT_BINARY_CACHE }}'"
        run: mkdir -p $VCPKG_DEFAULT_BINARY_CACHE
        shell: bash

      # Setup the build machine with the most recent versions of CMake and Ninja. Both are cached if not already: on subsequent runs both will be quickly restored from GitHub cache service.
      - uses: lukka/get-cmake@latest

      # Restore vcpkg from the GitHub Action cache service. Note that packages are restored by vcpkg's binary caching
      # when it is being run afterwards by CMake.
      - name: Restore vcpkg
        uses: actions/cache@v3
        with:
          # The first path is the location of vcpkg: it contains the vcpkg executable and data files, as long as the
          # built package archives (aka binary cache) which are located by VCPKG_DEFAULT_BINARY_CACHE env var.
          # The other paths starting with '!' are exclusions: they contain termporary files generated during the build of the installed packages.
          path: |
            ${{ env.VCPKG_ROOT }}
            !${{ env.VCPKG_ROOT }}/buildtrees
            !${{ env.VCPKG_ROOT }}/packages
            !${{ env.VCPKG_ROOT }}/downloads
            !${{ env.VCPKG_ROOT }}/installed
          # The key is composed in a way that it gets properly invalidated whenever a different version of vcpkg is being used.
          key: |
            ${{ hashFiles( '.git/modules/vcpkg/HEAD' )}}

      # On Windows runners, let's ensure to have the Developer Command Prompt environment setup correctly.
      # As used here the Developer Command Prompt created is targeting x64 and using the default the Windows SDK.
      - uses: ilammy/msvc-dev-cmd@v1

      # Run CMake to generate Ninja project files, using the vcpkg's toolchain file to resolve and install
      # the dependencies as specified in vcpkg.json. Note that the vcpkg's toolchain is specified
      # in the CMakePresets.json file.
      # This step also runs vcpkg with Binary Caching leveraging GitHub Action cache to 
      # store the built packages artifacts.
      - name: Restore from cache the dependencies and generate project files
        run: |
          cmake --preset lingo-ap-tracker-preset

      # Build (Release configuration only) the whole project with Ninja (which is spawn by CMake).
      - name: Build (Release configuration)
        run: |
          cmake --build --preset lingo-ap-tracker-preset --config Release