cmake_minimum_required(VERSION 3.15)

option(MSDFGEN_CORE_ONLY "Only build the core library with no dependencies" OFF)
option(MSDFGEN_BUILD_STANDALONE "Build the msdfgen standalone executable" ON)
option(MSDFGEN_USE_OPENMP "Build with OpenMP support for multithreaded code" OFF)
option(MSDFGEN_USE_CPP11 "Build with C++11 enabled" ON)
option(MSDFGEN_USE_SKIA "Build with the Skia library" OFF)
option(MSDFGEN_INSTALL "Generate installation target" ON)

if(MSDFGEN_CORE_ONLY AND MSDFGEN_BUILD_STANDALONE)
    message(WARNING "Option MSDFGEN_CORE_ONLY ignored - extensions are required for standalone executable")
    set(MSDFGEN_CORE_ONLY OFF)
endif()

project(msdfgen VERSION 1.9 LANGUAGES CXX)

if(NOT CMAKE_MSVC_RUNTIME_LIBRARY)
    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
    get_directory_property(MSDFGEN_HAS_PARENT PARENT_DIRECTORY)
    if(MSDFGEN_HAS_PARENT)
        set(CMAKE_MSVC_RUNTIME_LIBRARY ${CMAKE_MSVC_RUNTIME_LIBRARY} PARENT_SCOPE)
    endif()
endif()

if(NOT TARGET Freetype::Freetype)
    find_package(Freetype REQUIRED)
endif()

file(GLOB_RECURSE MSDFGEN_CORE_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} "core/*.h" "core/*.hpp")
file(GLOB_RECURSE MSDFGEN_CORE_SOURCES RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} "core/*.cpp")
file(GLOB_RECURSE MSDFGEN_EXT_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} "ext/*.h" "ext/*.hpp")
file(GLOB_RECURSE MSDFGEN_EXT_SOURCES RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} "ext/*.cpp" "lib/*.cpp")

# Core library
add_library(msdfgen-core "${CMAKE_CURRENT_SOURCE_DIR}/msdfgen.h" ${MSDFGEN_CORE_HEADERS} ${MSDFGEN_CORE_SOURCES})
add_library(msdfgen::msdfgen-core ALIAS msdfgen-core)
set_target_properties(msdfgen-core PROPERTIES PUBLIC_HEADER "${MSDFGEN_CORE_HEADERS}")
#set_property(TARGET msdfgen-core PROPERTY MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
target_include_directories(msdfgen-core INTERFACE
    $<INSTALL_INTERFACE:include/msdfgen>
    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/>
)
set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT msdfgen-core)

if(MSDFGEN_USE_CPP11)
    target_compile_features(msdfgen-core PUBLIC cxx_std_11)
    target_compile_definitions(msdfgen-core PUBLIC MSDFGEN_USE_CPP11)
endif()

if(MSDFGEN_USE_OPENMP)
    # Note: Clang doesn't support OpenMP by default...
    find_package(OpenMP REQUIRED COMPONENTS CXX)
    target_compile_definitions(msdfgen-core PUBLIC MSDFGEN_USE_OPENMP)
    target_link_libraries(msdfgen-core PUBLIC OpenMP::OpenMP_CXX)
endif()

# Extensions library
if(NOT MSDFGEN_CORE_ONLY)
    add_library(msdfgen-ext "${CMAKE_CURRENT_SOURCE_DIR}/msdfgen-ext.h" ${MSDFGEN_EXT_HEADERS} ${MSDFGEN_EXT_SOURCES})
    add_library(msdfgen::msdfgen-ext ALIAS msdfgen-ext)
    set_target_properties(msdfgen-ext PROPERTIES PUBLIC_HEADER "${MSDFGEN_EXT_HEADERS}")
    target_link_libraries(msdfgen-ext PUBLIC msdfgen::msdfgen-core Freetype::Freetype)
    target_include_directories(msdfgen-ext
        PUBLIC
            $<INSTALL_INTERFACE:include/msdfgen>
            $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
        PRIVATE
            ${CMAKE_CURRENT_SOURCE_DIR}/include
    )
    set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT msdfgen-ext)

    if(MSDFGEN_USE_SKIA)
        find_package(Skia REQUIRED)
        target_compile_definitions(msdfgen-ext PUBLIC MSDFGEN_USE_SKIA)
        target_link_libraries(msdfgen-ext PUBLIC Skia::Skia)
    endif()

    add_library(msdfgen-all INTERFACE)
    add_library(msdfgen::msdfgen ALIAS msdfgen-all)
    target_link_libraries(msdfgen-all INTERFACE msdfgen::msdfgen-core msdfgen::msdfgen-ext)
endif()

# Standalone executable
if(MSDFGEN_BUILD_STANDALONE)
    set(MSDFGEN_STANDALONE_SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/main.cpp")
    if(MSVC)
        set(MSDFGEN_STANDALONE_SOURCES ${MSDFGEN_STANDALONE_SOURCES} "${CMAKE_CURRENT_SOURCE_DIR}/msdfgen.rc")
    endif()
    add_executable(msdfgen ${MSDFGEN_STANDALONE_SOURCES})
    target_compile_definitions(msdfgen PUBLIC MSDFGEN_STANDALONE)
    target_link_libraries(msdfgen PUBLIC msdfgen::msdfgen)
    set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT msdfgen)
endif()

# Installation
if(MSDFGEN_INSTALL)
    include(GNUInstallDirs)
    include(CMakePackageConfigHelpers)
    set(MSDFGEN_CONFIG_PATH "lib/cmake/msdfgen")

    # install tree package config
    write_basic_package_version_file(
        "${CMAKE_CURRENT_BINARY_DIR}/msdfgenConfigVersion.cmake"
        VERSION ${PROJECT_VERSION}
        COMPATIBILITY SameMajorVersion
    )

    configure_package_config_file(
        cmake/msdfgenConfig.cmake.in
        ${MSDFGEN_CONFIG_PATH}/msdfgenConfig.cmake
        INSTALL_DESTINATION ${MSDFGEN_CONFIG_PATH}
        NO_CHECK_REQUIRED_COMPONENTS_MACRO
    )

    # build tree package config
    configure_file(
        cmake/msdfgenConfig.cmake.in
        msdfgenConfig.cmake
        @ONLY
    )

    install(TARGETS msdfgen-core EXPORT msdfgenTargets
        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
        FRAMEWORK DESTINATION ${CMAKE_INSTALL_LIBDIR}
        PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/msdfgen/core
    )
    install(FILES "${CMAKE_CURRENT_SOURCE_DIR}/msdfgen.h" DESTINATION include/msdfgen)

    if(NOT MSDFGEN_CORE_ONLY)
        install(TARGETS msdfgen-ext EXPORT msdfgenTargets
            RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
            LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
            ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
            FRAMEWORK DESTINATION ${CMAKE_INSTALL_LIBDIR}
            PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/msdfgen/ext
        )
        install(FILES "${CMAKE_CURRENT_SOURCE_DIR}/msdfgen-ext.h" DESTINATION include/msdfgen)
        install(TARGETS msdfgen-all EXPORT msdfgenTargets)
    endif()

    export(EXPORT msdfgenTargets NAMESPACE msdfgen:: FILE "${CMAKE_CURRENT_BINARY_DIR}/msdfgenTargets.cmake")
    install(EXPORT msdfgenTargets FILE msdfgenTargets.cmake NAMESPACE msdfgen:: DESTINATION ${MSDFGEN_CONFIG_PATH})

    if(MSDFGEN_BUILD_STANDALONE)
        install(TARGETS msdfgen EXPORT msdfgenBinaryTargets DESTINATION ${CMAKE_INSTALL_BINDIR})
        export(EXPORT msdfgenBinaryTargets NAMESPACE msdfgen-standalone:: FILE "${CMAKE_CURRENT_BINARY_DIR}/msdfgenBinaryTargets.cmake")
        install(EXPORT msdfgenBinaryTargets FILE msdfgenBinaryTargets.cmake NAMESPACE msdfgen-standalone:: DESTINATION ${MSDFGEN_CONFIG_PATH})
    endif()

    install(
        FILES
            "${CMAKE_CURRENT_BINARY_DIR}/${MSDFGEN_CONFIG_PATH}/msdfgenConfig.cmake"
            "${CMAKE_CURRENT_BINARY_DIR}/msdfgenConfigVersion.cmake"
        DESTINATION ${MSDFGEN_CONFIG_PATH}
    )
endif()