#!/usr/bin/env bash
set -e
builddir=$(cd "$(dirname "$0")"; pwd)
platform=x64
vs=vs2019
configuration=Release
build_only=false
ci=false
verbosity=minimal
rootdir="$builddir/.."
bindir="$rootdir/bin"
objdir="$builddir/obj"
gendir="$builddir/gen"
slnpath="$rootdir/CppSharp.sln"
oshost=""
os=""
test=

if [[ $(uname -m) != *"64"* ]]; then
  platform=x86
fi

build()
{
  if [ $ci = true ]; then
    clean
  fi

  if [ $ci = true ] || [ $build_only = false ]; then
    generate
    restore
  fi

  if [ $oshost = "linux" ] || [ $oshost = "macosx" ]; then
    config=$(tr '[:upper:]' '[:lower:]' <<< ${configuration}_$platform) make -C $builddir/gmake/
  fi

  find_msbuild
  $msbuild $slnpath -p:Configuration=$configuration -p:Platform=$platform -v:$verbosity

  if [ $ci = true ]; then
    test
  fi
}

generate()
{
  download_llvm

  if [ "$os" = "linux" ] || [ "$os" = "macosx" ]; then
    $builddir/premake.sh --file=$builddir/premake5.lua gmake2 --os=$os --arch=$platform --configuration=$configuration "$@"
  fi

  $builddir/premake.sh --file=$builddir/premake5.lua $vs --os=$os --arch=$platform --configuration=$configuration
}

restore()
{
  find_msbuild
  $msbuild $slnpath -p:Configuration=$configuration -p:Platform=$platform -v:$verbosity -t:restore 
}

test()
{
  dotnet test $bindir/${configuration}_$platform/*.Tests*.dll
}

clean()
{  
  rm -rf $objdir
  rm -rf $gendir
  rm -rf $bindir
  rm -rf $builddir/gmake
  rm -rf $builddir/$vs
  rm -rf $slnpath
}

download_premake()
{
  premake_dir=$builddir/premake
  premake_filename=premake5
  if [ $oshost = "windows" ]; then
    premake_filename=$premake_filename.exe
  fi
  premake_path=$premake_dir/$premake_filename

  if ! [ -f $premake_path ]; then
    echo "Downloading and unpacking Premake..."
    premake_url=https://github.com/InteropAlliance/premake-core/releases/download/latest/premake-$oshost-$platform.zip  
    curl -L -O $premake_url
    unzip premake-$oshost-$platform.zip $premake_filename -d $premake_dir
    chmod +x $premake_path
    rm premake-$oshost-$platform.zip
  fi
}

download_llvm()
{
  $builddir/premake.sh --file=$builddir/llvm/LLVM.lua download_llvm --os=$os --arch=$platform --configuration=$configuration
}

clone_llvm()
{
  $builddir/premake.sh --file=$builddir/llvm/LLVM.lua clone_llvm --os=$os --arch=$platform --configuration=$configuration
}

build_llvm()
{
  $builddir/premake.sh --file=$builddir/llvm/LLVM.lua build_llvm --os=$os --arch=$platform --configuration=$configuration
}

package_llvm()
{
  $builddir/premake.sh --file=$builddir/llvm/LLVM.lua package_llvm --os=$os --arch=$platform --configuration=$configuration
}

detect_os()
{
  case "$(uname -s)" in
    Darwin)
      oshost=macosx
      ;;
    Linux)
      oshost=linux
      ;;
    CYGWIN*|MINGW32*|MSYS*|MINGW*)
      oshost=windows
      ;;
    *)
      echo "Unsupported platform"
      exit 1
      ;;
  esac

  os=$oshost
}

find_msbuild()
{
  if [ -x "$(command -v MSBuild.exe)" ]; then
    msbuild="MSBuild.exe"
  else
    msbuild="msbuild"
  fi
}

cmd=$(tr '[:upper:]' '[:lower:]' <<< $1)
detect_os
download_premake

while [[ $# > 0 ]]; do
  option=$(tr '[:upper:]' '[:lower:]' <<< "${1/#--/-}")
  case "$option" in
    -debug)
      configuration=Debug
      ;;
    -configuration)
      configuration=$2
      shift
      ;;      
    -platform)
      platform=$2
      shift
      ;;
    -vs)
      vs=vs$2
      shift
      ;;
    -os)
      os=$2
      shift
      ;;
    -ci)
      ci=true
      ;;
    -build_only)
      build_only=true
      ;;
  esac
  shift
done

case "$cmd" in
  clean)
    clean
    ;;
  generate)
    generate
    ;;
  restore)
    restore
    ;;
  test)
    test
    ;;
  download_llvm)
    download_llvm
    ;;
  clone_llvm)
    clone_llvm
    ;;
  build_llvm)
    build_llvm
    ;;
  package_llvm)
    package_llvm
    ;;
  install_tools)
    download_premake
    ;;
   *)
    build
    ;;
esac