#[[
 * Copyright (c) 2026 Alexey Gavrilov <alexey.gavrilov@mail.com>
 *
 * This file is part of ObjectiveOS.
 *
 * ObjectiveOS is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * ObjectiveOS is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * ObjectiveOS. If not, see <https://www.gnu.org/licenses/>. 
 ]]

# Regard that file as root of whole project
# which include farther subprojects source codes

# Expected input variables:
#   ObjectiveProject_ARCHITECTURE: type of architecture

cmake_minimum_required(VERSION 3.25)

list(APPEND CMAKE_MESSAGE_CONTEXT ObjectiveProject)
project(ObjectiveProject LANGUAGES CXX ASM_NASM)

# Check on supported compiler
message(CHECK_START "Checking compiler support")
list(APPEND CMAKE_MESSAGE_INDENT "   ")
if(CMAKE_CXX_COMPILER_ID MATCHES "Clang|GNU")
    message(CHECK_PASS "Found")
    message(STATUS "${CMAKE_CXX_COMPILER_ID} found compiler")
else()
    message(CHECK_PASS "Not Found")
    message(STATUS "${CMAKE_CXX_COMPILER_ID} compiler isn't supported")
endif()
list(POP_BACK CMAKE_MESSAGE_INDENT)

set(ObjectiveProject_CXX_FLAGS
    $<$<CONFIG:Debug>:-Wall -Wextra -ggdb -g3 -O0>
    $<$<CONFIG:Release>:-Wall -Werror>
    -ffreestanding
    -nostdinc
    -nostdlib
    -fno-rtti
    -mgeneral-regs-only
)

set(ObjectiveProject_ASM_NASM_FLAGS
    $<$<CONFIG:Debug>:-g -O0 -Wall>
    $<$<CONFIG:RELEASE>:-Wall>
)

list(APPEND CMAKE_MODULE_PATH
    "${ObjectiveProject_SOURCE_DIR}/cmake/module"
)

include(feature)

# Propagate project information to feature module
featureProjectDataAssign(
    "${OBJECTIVE_SUPPORTED_PROCESSORS}"
    "${ObjectiveProject_SOURCE_DIR}"
    "${ObjectiveProject_ARCHITECTURE}"
    "cmake/toolchain"
)

include(metadata)
include(dexport)

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

add_executable(Objective)

# Set architecture by default if not present
message(CHECK_START "Checking architecture support")
list(APPEND CMAKE_MESSAGE_INDENT "   ")
if(NOT ObjectiveProject_ARCHITECTURE IN_LIST OBJECTIVE_SUPPORTED_PROCESSORS)
    if(ObjectiveProject_ARCHITECTURE STREQUAL "" OR NOT DEFINED ObjectiveProject_ARCHITECTURE)
        message(CHECK_FAIL "not set")
        message(FATAL_ERROR "Architecture isn't set")
    else()
        message(CHECK_FAIL "unknown")
        message(FATAL_ERROR "${ObjectiveProject_ARCHITECTURE} - unknown architecture")
    endif()
else()
    message(CHECK_FAIL "ok")
    message(STATUS "${ObjectiveProject_ARCHITECTURE} - chosen architecture")
endif()
list(POP_BACK CMAKE_MESSAGE_INDENT)

# Create targets with compilers requirements (include directories, flags and etc)
add_library(CXX_COMPILER_REQUIREMENTS INTERFACE)
add_library(ASM_NASM_COMPILER_REQUIREMENTS INTERFACE)

# Target with linker requirements
add_library(CXX_LINKER_REQUIREMENTS INTERFACE)

target_link_options(CXX_LINKER_REQUIREMENTS INTERFACE
    ${ObjectiveProject_CXX_FLAGS}
)
target_link_libraries(CXX_LINKER_REQUIREMENTS INTERFACE
    gcc
)

# Set cxx compiler flags
target_compile_options(CXX_COMPILER_REQUIREMENTS INTERFACE
    ${ObjectiveProject_CXX_FLAGS}
)

# Set nasm compiler flags
target_compile_options(ASM_NASM_COMPILER_REQUIREMENTS INTERFACE
    ${ObjectiveProject_ASM_NASM_FLAGS}
)

target_include_directories(CXX_COMPILER_REQUIREMENTS
    INTERFACE
        ${ObjectiveProject_SOURCE_DIR}/include
)

# Subscribe compiler requirements to Objective executable
target_link_libraries(Objective PUBLIC CXX_COMPILER_REQUIREMENTS)

add_subdirectory(arch)
add_subdirectory(kernel)
add_subdirectory(drivers)
add_subdirectory(include)
add_subdirectory(libgcc)

if(IS_BIND_FEATURES_TO_BUILD)
    bindFeaturesToBuild()
endif()

target_sources(Objective PRIVATE
    $<TARGET_OBJECTS:Boot>
)

target_link_libraries(Objective PRIVATE
    $<TARGET_OBJECTS:CRTI>
    $<TARGET_OBJECTS:CRTBEGIN>
    Architecture
    Kernel
    Drivers
    $<TARGET_OBJECTS:CRTEND>
    $<TARGET_OBJECTS:CRTN>
)

# Set cxx linker options
target_link_libraries(Objective PRIVATE CXX_LINKER_REQUIREMENTS)

outFeaturesToFile()
definesFileExport()