cmake_minimum_required(VERSION "3.27")

project("kernel"
  DESCRIPTION "An educational OS kernel"
  HOMEPAGE_URL "https://gitlab.ost.ch/teachos/kernel"
  VERSION "0.0.1"
  LANGUAGES ASM C CXX
)

#[============================================================================[
# Global Build System Configuration
#]============================================================================]

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/bin")
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/lib")
set(CMAKE_INTERPROCEDURAL_OPTIMIZATION YES)

set(CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake/Modules")

set(CMAKE_CXX_STANDARD "20")
set(CMAKE_CXX_STANDARD_REQUIRED YES)
set(CMAKE_CXX_EXTENSIONS NO)

#[============================================================================[
# Global Build System Configuration
#]============================================================================]

add_executable("kernel")

add_subdirectory("libs")
add_subdirectory("kern")
add_subdirectory("arch")

target_link_libraries("kernel" PRIVATE
    "kern"
    "arch::any"
    "arch::${CMAKE_SYSTEM_PROCESSOR}"
)

# #[============================================================================[
# # Documentation
# #]============================================================================]

# find_package("Doxygen")

# set(DOXYGEN_GENERATE_HTML YES)
# set(DOXYGEN_GENERATE_XML YES)
# set(DOXYGEN_EXCLUDE_PATTERNS "*.cpp")
# set(DOXYGEN_OUTPUT_DIRECTORY "doxygen")
# set(DOXYGEN_QUIET YES)

# file(GLOB_RECURSE DOXYGEN_SOURCES CONFIGURE_DEPENDS "*.hpp")

# message(STATUS "${SPHINX_SOURCES}")

# doxygen_add_docs("docs_xml"
#   ${DOXYGEN_SOURCES}
#   ALL
#   USE_STAMP_FILE
#   COMMENT "Generating developer documentation sources"
# )

# set_target_properties("docs_xml" PROPERTIES
#   ADDITIONAL_CLEAN_FILES
#   "${PROJECT_BINARY_DIR}/doxygen"
# )

# file(GLOB_RECURSE SPHINX_SOURCES CONFIGURE_DEPENDS "../docs/**.rst") 

# add_custom_target("docs" ALL
#   COMMAND "${SPHINX_BUILD_EXE}"
#   "../docs"
#   "docs"
#   "-q"
#   DEPENDS "docs_xml"
#   SOURCES ${SPHINX_SOURCES}
#   COMMENT "Generating developer documentation html"
# )

# set_target_properties("docs" PROPERTIES
#   ADDITIONAL_CLEAN_FILES
#   "${PROJECT_BINARY_DIR}/docs"
# )

# #[============================================================================[
# # Global Compiler Configuration
# #]============================================================================]

# add_compile_options(
#   "$<$<CXX_COMPILER_ID:GNU>:-Wall>"
#   "$<$<CXX_COMPILER_ID:GNU>:-Wextra>"
#   "$<$<CXX_COMPILER_ID:GNU>:-Werror>"
#   "$<$<CXX_COMPILER_ID:GNU>:-pedantic-errors>"
# )

# #[============================================================================[
# # Global Libraries
# #]============================================================================]

# add_subdirectory("libs/kstd" EXCLUDE_FROM_ALL SYSTEM)
# add_subdirectory("libs/multiboot2" EXCLUDE_FROM_ALL SYSTEM)

# #[============================================================================[
# # Global Directories
# #]============================================================================]

# include_directories(
#   "include"
#   "arch/${CMAKE_SYSTEM_PROCESSOR}/include"
# )

# #[============================================================================[
# # The Bootstrap Library
# #]============================================================================]

# add_library("_boot" OBJECT)
# add_library("teachos::boot" ALIAS "_boot")

# #[============================================================================[
# # The Video Library
# #]============================================================================]

# add_library("_video" OBJECT)
# add_library("teachos::video" ALIAS "_video")

# #[============================================================================[
# # THE Memory Library
# #]============================================================================]

# add_library("_memory" OBJECT)
# add_library("teachos::memory" ALIAS "_memory")

# #[============================================================================[
# # The Exception handling Library
# #]============================================================================]

# add_library("_exception" OBJECT)
# add_library("teachos::exception" ALIAS "_exception")

# #[============================================================================[
# # The Context switching Library
# #]============================================================================]

# add_library("_context" OBJECT)
# add_library("teachos::context_switching" ALIAS "_context")

# add_library("_interrupt_handling" OBJECT)
# add_library("teachos::interrupt_handling" ALIAS "_interrupt_handling")
# # https://forum.osdev.org/viewtopic.php?f=1&t=36712
# # https://gcc.gnu.org/onlinedocs/gcc/x86-Function-Attributes.html#index-interrupt-function-attribute_002c-x86
# target_compile_options("_interrupt_handling" PRIVATE "-mgeneral-regs-only")

# #[============================================================================[
# # The Kernel
# #]============================================================================]

# add_executable("_kernel"
#   "src/kernel/main.cpp"
# )
# add_executable("teachos::kernel" ALIAS "_kernel")

# target_link_libraries("_kernel" PRIVATE
#   "teachos::boot"
#   "teachos::video"
#   "teachos::memory"
#   "teachos::exception"
#   "teachos::context_switching"
#   "teachos::interrupt_handling"
# )

# #[============================================================================[
# # Platform Specific Components
# #]============================================================================]

# add_subdirectory("arch/${CMAKE_SYSTEM_PROCESSOR}")