#!/bin/sh -e

function show_help () {
cat <<EOL
Usage: configure [options]
    -h, --help              Displays this help

    --disable-mac           Disable most of the Mac-related parts.
    --disable-ios           Disable most of the iOS-related parts.
                            The iOS build depend on some parts of the Mac build, so
                            a complete separation is not possible (neither desirable,
                            some parts will always be enabled to catch common programmer
                            errors causing build breaks).
                            The main reasons for disabling either part is to have faster
                            builds and disable the non-relevant tests.

    --disable-ios-device    Disables all device-related parts from the iOS build.
                            This can be used to speed up the build.

    --disable-strip:        If executables should be stripped or not.
                            Disable to make it easier to debug executables using lldb.

    --enable-ccache
    --disable-ccache        Enable/disable ccache. Default: enabled if detected.

    --enable-xamarin        Enable additional Xamarin-specific parts of the build.

    --disable-packaged-llvm Compile LLVM instead of downloading a precompiled version.

    --enable-packaged-mono
    --disable-packaged-mono Enable/disable using the precompiled version of mono. If disabled mono will be compiled from source.

    --enable-dotnet         Enable building .NET 6 bits.
    --disable-dotnet        Disable building .NET 6 bits.

    --enable-dotnet-windows         Enable building Windows .NET 6 bits. Building .NET 6 bits must be also enabled (--enable-dotnet).
    --disable-dotnet-windows        Disable building Windows .NET 6 bits. 

    --enable-documentation  Enable building of API documentation
    --disable-documentation Disable building of API documentation.

    --enable-install-source  Enable building of API documentation
    --disable-install-source Disable building of API documentation.
EOL
}

CONFIGURED_FILE=configure.inc

rm -f $CONFIGURED_FILE

if test -z "$1"; then
	echo "configure: all default values assumed."
    exit 0
fi

echo "# Configure arguments: $*" >> $CONFIGURED_FILE

while test x$1 != x; do
	case $1 in
	--disable-mac)
		echo "INCLUDE_MAC=" >> $CONFIGURED_FILE
		echo "Mac Build disabled (partially)"
		shift
		;;
    --disable-ios-device)
        echo "INCLUDE_DEVICE=" >> $CONFIGURED_FILE
        shift
        ;;
	--disable-ios)
		echo "INCLUDE_IOS=" >> $CONFIGURED_FILE
		echo "INCLUDE_WATCH=" >> $CONFIGURED_FILE
		echo "INCLUDE_TVOS=" >> $CONFIGURED_FILE
		echo "iOS Build disabled (partially)"
		shift
		;;
	--disable-strip)
		echo "DISABLE_STRIP=1" >> $CONFIGURED_FILE
		shift
		;;
    --disable-ccache)
        echo "ENABLE_CCACHE=" >> $CONFIGURED_FILE
        shift
        ;;
    --enable-ccache)
        if ! command -v ccache >/dev/null; then
            echo "Could not find ccache"
        else
            echo "ENABLE_CCACHE=1" >> $CONFIGURED_FILE
            echo "cache enabled"
        fi
        shift
        ;;
    --enable-xamarin)
        echo "ENABLE_XAMARIN=1" >> $CONFIGURED_FILE
        shift
        ;;
	--enable-bitcode-on-ios)
		# Private option
		echo "ENABLE_BITCODE_ON_IOS=1" >> $CONFIGURED_FILE
		shift
		;;
	--disable-packaged-llvm)
		echo "DISABLE_DOWNLOAD_LLVM=1" >> $CONFIGURED_FILE
		shift
		;;
    --enable-packaged-mono)
        echo "MONO_BUILD_FROM_SOURCE=" >> "$CONFIGURED_FILE"
        shift
        ;;
    --disable-packaged-mono)
        echo "MONO_BUILD_FROM_SOURCE=1" >> "$CONFIGURED_FILE"
        shift
        ;;
    --disable-packaged-mono=no | --disable-packaged-mono=false)
        echo "MONO_BUILD_FROM_SOURCE=" >> "$CONFIGURED_FILE"
        shift
        ;;
    --enable-dotnet)
        echo "ENABLE_DOTNET=1" >> "$CONFIGURED_FILE"
        shift
        ;;
    --disable-dotnet)
        echo "ENABLE_DOTNET=" >> "$CONFIGURED_FILE"
        shift
        ;;
    --enable-dotnet-windows)
        echo "ENABLE_DOTNET_WINDOWS=1" >> "$CONFIGURED_FILE"
        shift
        ;;
    --disable-dotnet-windows)
        echo "ENABLE_DOTNET_WINDOWS=" >> "$CONFIGURED_FILE"
        shift
        ;;
    --enable-install-source)
        echo "ENABLE_INSTALL_SOURCE=1" >> "$CONFIGURED_FILE"
        shift
        ;;
    --disable-install-source)
        echo "ENABLE_INSTALL_SOURCE=" >> "$CONFIGURED_FILE"
        shift
        ;;
	--help|-h)
		show_help
		exit 0
		;;
	*)
		echo "Unknown configure argument $1" >&2
		shift
		;;
	esac
done
exit 0