cmake_minimum_required(VERSION 3.15)

project(XCEngineManaged NONE)

if(NOT XCENGINE_ENABLE_MONO_SCRIPTING)
    return()
endif()

if(NOT WIN32)
    message(FATAL_ERROR "XCENGINE_ENABLE_MONO_SCRIPTING currently requires Windows.")
endif()

find_program(XCENGINE_DOTNET_EXECUTABLE dotnet REQUIRED)

set(
    XCENGINE_MANAGED_OUTPUT_DIR
    "${CMAKE_BINARY_DIR}/managed"
    CACHE PATH
    "Output directory for generated managed assemblies")

execute_process(
    COMMAND ${XCENGINE_DOTNET_EXECUTABLE} --list-sdks
    OUTPUT_VARIABLE XCENGINE_DOTNET_SDK_LIST
    OUTPUT_STRIP_TRAILING_WHITESPACE)

string(REGEX MATCHALL "[0-9]+\\.[0-9]+\\.[0-9]+" XCENGINE_DOTNET_SDK_VERSIONS "${XCENGINE_DOTNET_SDK_LIST}")
if(NOT XCENGINE_DOTNET_SDK_VERSIONS)
    message(FATAL_ERROR "Failed to locate a .NET SDK for managed scripting assemblies.")
endif()

list(GET XCENGINE_DOTNET_SDK_VERSIONS -1 XCENGINE_DOTNET_SDK_VERSION)

set(XCENGINE_CSC_DLL "C:/Program Files/dotnet/sdk/${XCENGINE_DOTNET_SDK_VERSION}/Roslyn/bincore/csc.dll")
set(XCENGINE_NET472_REFERENCE_DIR "C:/Program Files (x86)/Reference Assemblies/Microsoft/Framework/.NETFramework/v4.7.2")
set(XCENGINE_MONO_CORLIB_DIR "${XCENGINE_MONO_ROOT_DIR}/binary" CACHE PATH "Directory containing the bundled Mono corlib")
set(XCENGINE_MONO_MSCORLIB_PATH "${XCENGINE_MONO_CORLIB_DIR}/mscorlib.dll")

set(XCENGINE_SCRIPT_CORE_DLL "${XCENGINE_MANAGED_OUTPUT_DIR}/XCEngine.ScriptCore.dll" CACHE FILEPATH "Generated XCEngine.ScriptCore assembly")
set(XCENGINE_GAME_SCRIPTS_DLL "${XCENGINE_MANAGED_OUTPUT_DIR}/GameScripts.dll" CACHE FILEPATH "Generated GameScripts assembly")

foreach(XCENGINE_REQUIRED_PATH
    "${XCENGINE_CSC_DLL}"
    "${XCENGINE_NET472_REFERENCE_DIR}/mscorlib.dll"
    "${XCENGINE_NET472_REFERENCE_DIR}/System.dll"
    "${XCENGINE_NET472_REFERENCE_DIR}/System.Core.dll"
    "${XCENGINE_MONO_MSCORLIB_PATH}")
    if(NOT EXISTS "${XCENGINE_REQUIRED_PATH}")
        message(FATAL_ERROR "Required managed scripting dependency is missing: ${XCENGINE_REQUIRED_PATH}")
    endif()
endforeach()

set(XCENGINE_SCRIPT_CORE_SOURCES
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/Camera.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/Behaviour.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/Component.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/Debug.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/GameObject.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/InternalCalls.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/Light.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/MonoBehaviour.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/Quaternion.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/Space.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/Time.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/Transform.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/Vector2.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/Vector3.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/XCEngine.ScriptCore/Vector4.cs
)

set(XCENGINE_GAME_SCRIPT_SOURCES
    ${CMAKE_CURRENT_SOURCE_DIR}/GameScripts/BuiltinComponentProbe.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/GameScripts/HierarchyProbe.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/GameScripts/LifecycleProbe.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/GameScripts/TransformConversionProbe.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/GameScripts/TransformMotionProbe.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/GameScripts/TransformOrientationProbe.cs
    ${CMAKE_CURRENT_SOURCE_DIR}/GameScripts/TransformSpaceProbe.cs
)

set(XCENGINE_MANAGED_FRAMEWORK_REFERENCES
    /reference:${XCENGINE_NET472_REFERENCE_DIR}/mscorlib.dll
    /reference:${XCENGINE_NET472_REFERENCE_DIR}/System.dll
    /reference:${XCENGINE_NET472_REFERENCE_DIR}/System.Core.dll
)

add_custom_command(
    OUTPUT ${XCENGINE_SCRIPT_CORE_DLL}
    COMMAND ${CMAKE_COMMAND} -E make_directory ${XCENGINE_MANAGED_OUTPUT_DIR}
    COMMAND ${XCENGINE_DOTNET_EXECUTABLE} ${XCENGINE_CSC_DLL}
            /nologo
            /target:library
            /langversion:latest
            /nostdlib+
            /out:${XCENGINE_SCRIPT_CORE_DLL}
            ${XCENGINE_MANAGED_FRAMEWORK_REFERENCES}
            ${XCENGINE_SCRIPT_CORE_SOURCES}
    DEPENDS ${XCENGINE_SCRIPT_CORE_SOURCES}
    VERBATIM
    COMMENT "Building XCEngine.ScriptCore.dll")

add_custom_command(
    OUTPUT ${XCENGINE_GAME_SCRIPTS_DLL}
    COMMAND ${CMAKE_COMMAND} -E make_directory ${XCENGINE_MANAGED_OUTPUT_DIR}
    COMMAND ${XCENGINE_DOTNET_EXECUTABLE} ${XCENGINE_CSC_DLL}
            /nologo
            /target:library
            /langversion:latest
            /nostdlib+
            /out:${XCENGINE_GAME_SCRIPTS_DLL}
            ${XCENGINE_MANAGED_FRAMEWORK_REFERENCES}
            /reference:${XCENGINE_SCRIPT_CORE_DLL}
            ${XCENGINE_GAME_SCRIPT_SOURCES}
    DEPENDS ${XCENGINE_GAME_SCRIPT_SOURCES} ${XCENGINE_SCRIPT_CORE_DLL}
    VERBATIM
    COMMENT "Building GameScripts.dll")

add_custom_command(
    OUTPUT ${XCENGINE_MANAGED_OUTPUT_DIR}/mscorlib.dll
    COMMAND ${CMAKE_COMMAND} -E make_directory ${XCENGINE_MANAGED_OUTPUT_DIR}
    COMMAND ${CMAKE_COMMAND} -E copy_if_different
            ${XCENGINE_MONO_MSCORLIB_PATH}
            ${XCENGINE_MANAGED_OUTPUT_DIR}/mscorlib.dll
    DEPENDS ${XCENGINE_MONO_MSCORLIB_PATH}
    VERBATIM
    COMMENT "Copying mscorlib.dll for Mono runtime resolution")

add_custom_target(
    xcengine_managed_assemblies
    DEPENDS
        ${XCENGINE_SCRIPT_CORE_DLL}
        ${XCENGINE_GAME_SCRIPTS_DLL}
        ${XCENGINE_MANAGED_OUTPUT_DIR}/mscorlib.dll
)