#!/bin/bash -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
    --disable-xamarin       Enable/disable 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-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.

    --enable-legacy-xamarin  Enable building the legacy version of Xamarin.iOS/Xamarin.Mac.
    --disable-legacy-xamarin Disable building the legacy version of Xamarin.iOS/Xamarin.Mac.

    --custom-dotnet=[artifacts] Use a locally built version of dotnet/runtime. See docs/CORECLR.md for detailed instructions about how to build dotnet/runtime from source.

    --ignore-unknown-params  alters the default behavior to not return an non-zero exit code when an unknown parameter is provided.
EOL
}

cd "$(dirname "${BASH_SOURCE[0]}")"
CONFIGURED_FILE=configure.inc
IGNORE_UNKNOWN_PARAMS=false
UNKNOWN_PARAMETERS=

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-all-platforms)
        echo "INCLUDE_MAC=" >> $CONFIGURED_FILE
        echo "INCLUDE_IOS=" >> $CONFIGURED_FILE
        echo "INCLUDE_TVOS=" >> $CONFIGURED_FILE
        echo "INCLUDE_WATCH=" >> $CONFIGURED_FILE
        echo "INCLUDE_MACCATALYST=" >> $CONFIGURED_FILE
        echo "Disabled all platforms"
        shift
        ;;
    --disable-mac | --disable-macos)
        echo "INCLUDE_MAC=" >> $CONFIGURED_FILE
        echo "Mac Build disabled"
        shift
        ;;
    --enable-mac | --enable-macos)
        echo "INCLUDE_MAC=1" >> $CONFIGURED_FILE
        echo "Mac Build enabled"
        shift
        ;;
    --disable-ios-device)
        echo "INCLUDE_DEVICE=" >> $CONFIGURED_FILE
        shift
        ;;
    --disable-ios)
        echo "INCLUDE_IOS=" >> $CONFIGURED_FILE
        echo "iOS Build disabled"
        shift
        ;;
    --enable-ios)
        echo "INCLUDE_IOS=1" >> $CONFIGURED_FILE
        echo "iOS Build enabled"
        shift
        ;;
    --disable-tvos)
        echo "INCLUDE_TVOS=" >> $CONFIGURED_FILE
        echo "tvOS Build disabled"
        shift
        ;;
    --enable-tvos)
        echo "INCLUDE_TVOS=1" >> $CONFIGURED_FILE
        echo "tvOS Build enabled"
        shift
        ;;
    --disable-watchos)
        echo "INCLUDE_WATCH=" >> $CONFIGURED_FILE
        echo "watchOS Build disabled"
        shift
        ;;
    --enable-watchos)
        echo "INCLUDE_WATCH=1" >> $CONFIGURED_FILE
        echo "watchOS Build enabled"
        shift
        ;;
    --disable-maccatalyst)
        echo "INCLUDE_MACCATALYST=" >> $CONFIGURED_FILE
        echo "Mac Catalyst Build disabled"
        shift
        ;;
    --enable-maccatalyst)
        echo "INCLUDE_MACCATALYST=1" >> $CONFIGURED_FILE
        echo "Mac Catalyst Build enabled"
        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
        ;;
    --disable-xamarin)
        echo "ENABLE_XAMARIN=" >> $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 "$1 is ignored. Use --enable-dotnet instead"
        shift
        ;;
    --disable-dotnet-windows)
        echo "$1 is ignored. Use --disable-dotnet instead"
        shift
        ;;
    --enable-install-source)
        echo "ENABLE_INSTALL_SOURCE=1" >> "$CONFIGURED_FILE"
        shift
        ;;
    --disable-install-source)
        echo "ENABLE_INSTALL_SOURCE=" >> "$CONFIGURED_FILE"
        shift
        ;;
    --enable-legacy-xamarin)
        echo "INCLUDE_XAMARIN_LEGACY=1" >> "$CONFIGURED_FILE"
        shift
        ;;
    --disable-legacy-xamarin)
        echo "INCLUDE_XAMARIN_LEGACY=" >> "$CONFIGURED_FILE"
        shift
        ;;
    --custom-dotnet=*)
        echo "CUSTOM_DOTNET=1" >> "$CONFIGURED_FILE"
        echo "DOTNET_RUNTIME_PATH=${1:16}" >> "$CONFIGURED_FILE"
        shift
        ;;
    --custom-dotnet)
        echo "CUSTOM_DOTNET=1" >> "$CONFIGURED_FILE"
        echo "DOTNET_RUNTIME_PATH=$2" >> "$CONFIGURED_FILE"
        shift 2
        ;;
    --ignore-unknown-params)
        echo "ignoring unknown parameters"
        IGNORE_UNKNOWN_PARAMS=true
        shift
        ;;
    --help|-h)
        show_help
        exit 0
        ;;
    *)
        echo "Unknown configure argument $1" >&2
        UNKNOWN_PARAMETERS="$UNKNOWN_PARAMETERS $1"
        shift
        ;;
    esac
done

if [[ "$IGNORE_UNKNOWN_PARAMS" = false ]] && [[ -n "$UNKNOWN_PARAMETERS" ]]; then
    exit 1
fi

if [[ "$IGNORE_UNKNOWN_PARAMS" = true ]] && [[ -n "$UNKNOWN_PARAMETERS" ]]; then
    echo "The following parameters were ignored: $UNKNOWN_PARAMETERS"
fi

exit 0