# Copyright 2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# A reusable workflow to build and test Packager on every supported OS and
# architecture.
name: Build

# Runs when called from another workflow.
on:
  workflow_call:
    inputs:
      ref:
        required: true
        type: string
    secrets:
      # The GITHUB_TOKEN name is reserved, but not passed through implicitly.
      # So we call our secret parameter simply TOKEN.
      TOKEN:
        required: false

      # These below are not actual secrets, but secrets are the only place to
      # keep repo-specific configs that make this project friendlier to forks
      # and easier to debug.

      # If non-empty, start a debug SSH server on failures.
      ENABLE_DEBUG:
        required: false
      # If non-empty, enable self-hosted runners in the build matrix.
      ENABLE_SELF_HOSTED:
        required: false

# By default, run all commands in a bash shell.  On Windows, the default would
# otherwise be powershell.
defaults:
  run:
    shell: bash

jobs:
  # Configure the build matrix based on inputs.  The list of objects in the
  # build matrix contents can't be changed by conditionals, but it can be
  # computed by another job and deserialized.  This uses
  # secrets.ENABLE_SELF_HOSTED to determine the build matrix, based on the
  # metadata in build-matrix.json.
  matrix_config:
    runs-on: ubuntu-latest
    outputs:
      INCLUDE: ${{ steps.configure.outputs.INCLUDE }}
      OS: ${{ steps.configure.outputs.OS }}
      ENABLE_DEBUG: ${{ steps.configure.outputs.ENABLE_DEBUG }}
    steps:
      - uses: actions/checkout@v2
        with:
          ref: ${{ inputs.ref }}

      - name: Configure Build Matrix
        id: configure
        shell: node {0}
        run: |
          const enableDebug = "${{ secrets.ENABLE_DEBUG }}" != '';
          const enableSelfHosted = "${{ secrets.ENABLE_SELF_HOSTED }}" != '';

          // Use ENABLE_SELF_HOSTED to decide what the build matrix below
          // should include.
          const {hosted, selfHosted} = require("${{ github.workspace }}/.github/workflows/build-matrix.json");
          const include = enableSelfHosted ? hosted.concat(selfHosted) : hosted;
          const os = include.map((config) => config.os);

          // Output JSON objects consumed by the build matrix below.
          console.log(`::set-output name=INCLUDE::${ JSON.stringify(include) }`);
          console.log(`::set-output name=OS::${ JSON.stringify(os) }`);

          // Output the debug flag directly.
          console.log(`::set-output name=ENABLE_DEBUG::${ enableDebug }`);

          // Log the outputs, for the sake of debugging this script.
          console.log({enableDebug, include, os});

  build:
    needs: matrix_config
    strategy:
      fail-fast: false
      matrix:
        include: ${{ fromJSON(needs.matrix_config.outputs.INCLUDE) }}
        os: ${{ fromJSON(needs.matrix_config.outputs.OS) }}
        build_type: ["Debug", "Release"]
        lib_type: ["static", "shared"]

    name: ${{ matrix.os_name }} ${{ matrix.target_arch }} ${{ matrix.build_type }} ${{ matrix.lib_type }}
    runs-on: ${{ matrix.os }}

    steps:
      - name: Configure git to preserve line endings
        # Otherwise, tests fail on Windows because "golden" test outputs will not
        # have the correct line endings.
        run: git config --global core.autocrlf false

      - name: Checkout code
        uses: actions/checkout@v2
        with:
          ref: ${{ inputs.ref }}
          submodules: true

      - name: Install Linux deps
        if: runner.os == 'Linux'
        run: sudo apt install -y libc-ares-dev

      - name: Generate build files
        run: |
          mkdir -p build/

          if [[ "${{ matrix.lib_type }}" == "shared" ]]; then
            LIBPACKAGER_SHARED="ON"
          else
            LIBPACKAGER_SHARED="OFF"
          fi

          cmake \
            -DCMAKE_BUILD_TYPE="${{ matrix.build_type }}" \
            -DLIBPACKAGER_SHARED="$LIBPACKAGER_SHARED" \
            -S . \
            -B build/

      - name: Build
        # This is a universal build command, which will call make on Linux and
        # Visual Studio on Windows.  Note that the VS generator is what cmake
        # calls a "multi-configuration" generator, and so the desired build
        # type must be specified for Windows.
        run: cmake --build build/ --config "${{ matrix.build_type }}"

      - name: Test
        run: cd build; ctest -C "${{ matrix.build_type }}" -V

      # TODO(joeyparrish): Prepare artifacts when build system is complete again
#      - name: Prepare artifacts (static release only)
#        run: |
#          BUILD_CONFIG="${{ matrix.build_type }}-${{ matrix.lib_type }}"
#          if [[ "$BUILD_CONFIG" != "Release-static" ]]; then
#            echo "Skipping artifacts for $BUILD_CONFIG."
#            exit 0
#          fi
#          if [[ "${{ runner.os }}" == "Linux" ]]; then
#            echo "::group::Check for static executables"
#            (
#              cd build/Release
#              # Prove that we built static executables on Linux.  First, check that
#              # the executables exist, and fail if they do not.  Then check "ldd",
#              # which will fail if the executable is not dynamically linked.  If
#              # "ldd" succeeds, we fail the workflow.  Finally, we call "true" so
#              # that the last executed statement will be a success, and the step
#              # won't be failed if we get that far.
#              ls packager mpd_generator >/dev/null || exit 1
#              ldd packager 2>&1 && exit 1
#              ldd mpd_generator 2>&1 && exit 1
#              true
#            )
#            echo "::endgroup::"
#          fi
#          echo "::group::Prepare artifacts folder"
#          mkdir artifacts
#          ARTIFACTS="$GITHUB_WORKSPACE/artifacts"
#          cd build/Release
#          echo "::endgroup::"
#          echo "::group::Strip executables"
#          strip packager${{ matrix.exe_ext }}
#          strip mpd_generator${{ matrix.exe_ext }}
#          echo "::endgroup::"
#          SUFFIX="-${{ matrix.os_name }}-${{ matrix.target_arch }}"
#          EXE_SUFFIX="$SUFFIX${{ matrix.exe_ext}}"
#          echo "::group::Copy packager"
#          cp packager${{ matrix.exe_ext }} $ARTIFACTS/packager$EXE_SUFFIX
#          echo "::endgroup::"
#          echo "::group::Copy mpd_generator"
#          cp mpd_generator${{ matrix.exe_ext }} $ARTIFACTS/mpd_generator$EXE_SUFFIX
#          echo "::endgroup::"
#          # The pssh-box bundle is OS and architecture independent.  So only do
#          # it on this one OS and architecture, and give it a more generic
#          # filename.
#          if [[ '${{ matrix.os_name }}' == 'linux' && '${{ matrix.target_arch }}' == 'x64' ]]; then
#            echo "::group::Tar pssh-box"
#            tar -czf $ARTIFACTS/pssh-box.py.tar.gz pyproto pssh-box.py
#            echo "::endgroup::"
#          fi

      # TODO(joeyparrish): Attach artifacts when build system is complete again
#      - name: Attach artifacts to release
#        if: matrix.build_type == 'Release' && matrix.lib_type == 'static'
#        uses: dwenegar/upload-release-assets@v1
#        env:
#          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
#        with:
#          release_id: ${{ needs.draft_release.outputs.release_id }}
#          assets_path: artifacts

      - name: Debug
        uses: mxschmitt/action-tmate@v3.6
        with:
          limit-access-to-actor: true
        if: failure() && needs.matrix_config.outputs.ENABLE_DEBUG != ''