cmake_minimum_required(VERSION 3.21)

project(townengine LANGUAGES C)

list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)

set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# dependencies
find_package(SDL2 REQUIRED)
find_package(SDL2_image REQUIRED)
find_package(SDL2_ttf REQUIRED)

if (NOT CMAKE_BUILD_TYPE)
        set(CMAKE_BUILD_TYPE Debug)
endif ()


set(PHYSFS_BUILD_SHARED FALSE)
set(PHYSFS_DISABLE_INSTALL TRUE)
set(PHYSFS_TARGETNAME_UNINSTALL "physfs_uninstall")
add_subdirectory(third-party/physfs)
add_subdirectory(third-party/libxm)


if(UNIX)
        set(SYSTEM_SOURCE_FILES
                src/system/linux/elf.c
        )
else()
        set(SYSTEM_SOURCE_FILES)
endif()

set(SOURCE_FILES
        third-party/physfs/extras/physfsrwops.c
        third-party/stb/stb_vorbis.c
        third-party/glad/src/glad.c

        src/config.h
        src/context.h
        src/context.c
        src/main.c
        src/audio.c
        src/util.c src/util.h
        src/rendering.c src/rendering.h
        src/textures.c src/textures.h
        src/input.c src/input.h
        src/text.c src/text.h
        src/game_api.h

        src/game/game.c src/game/game.h
        src/game/state.h

        src/game/player.c src/game/player.h
        src/game/world.c src/game/world.h

        src/game/scenes/scene.c src/game/scenes/scene.h
        src/game/scenes/title.c src/game/scenes/title.h
        src/game/scenes/ingame.c src/game/scenes/ingame.h

        ${SYSTEM_SOURCE_FILES}
)

# target
add_executable(${PROJECT_NAME} ${SOURCE_FILES})
source_group(TREE ${CMAKE_CURRENT_SOURCE_DIR} FILES ${SOURCE_FILES})

set_target_properties(${PROJECT_NAME} PROPERTIES
                                      C_STANDARD 11
                                      C_STANDARD_REQUIRED ON
                                      C_EXTENSIONS ON) # extensions are required by stb_ds.h

# distribution definitions
set(ORGANIZATION_NAME "wanp" CACHE STRING
                      "App developer/publisher's identifier")
set(APP_NAME "townengine" CACHE STRING
             "App identifier")
set(PACKAGE_EXTENSION "btw" CACHE STRING
                      "File extension used to look for data archives")

# build options
# LTO will be used on release builds
if(MSVC)
        # close enough i say
        target_compile_options(${PROJECT_NAME} PRIVATE
                                               /W4
                                               $<$<CONFIG:Release>:/GL>)

        target_link_options(${PROJECT_NAME} PRIVATE
                                            $<$<CONFIG:Release>:/LTCG>)

else()
        set(WARNING_FLAGS_CLANG
                -Weverything
                -Wno-padded
                -Wno-declaration-after-statement
                -Wno-unsafe-buffer-usage
                -Wno-unused-command-line-argument)

        set(WARNING_FLAGS
                -Wall
                -Wextra
                -Wpedantic
                -Wshadow
                -Wdouble-promotion
                -Wconversion -Wno-sign-conversion
                -Werror=vla
                $<$<STREQUAL:${CMAKE_C_COMPILER_ID},Gnu>:-Wcast-align=strict>
                $<$<STREQUAL:${CMAKE_C_COMPILER_ID},Clang>:${WARNING_FLAGS_CLANG}>)

        set(BUILD_FLAGS
                # these SHOULDN'T break anything...
                -fno-math-errno
                -ffp-contract=fast
                -fno-signed-zeros
                -fno-trapping-math
                -freciprocal-math)

        set(BUILD_FLAGS_RELEASE
                -O3
                -flto
                -mavx -mavx2
                -Wl,--gc-sections
                -fdata-sections
                -ffunction-sections
                -funroll-loops
                -fomit-frame-pointer
                $<$<STREQUAL:${CMAKE_C_COMPILER_ID},Gnu>:-fallow-store-data-races>)

        set(BUILD_FLAGS_DEBUG
                -O0
                -g3
                -gdwarf
                -fno-omit-frame-pointer
                -fstack-protector-all
                -fsanitize=undefined
                -fsanitize=address)

        target_compile_options(${PROJECT_NAME} PRIVATE
                                               ${WARNING_FLAGS}
                                               ${BUILD_FLAGS}
                                               $<$<CONFIG:Release>:${BUILD_FLAGS_RELEASE}>
                                               $<$<CONFIG:Debug>:${BUILD_FLAGS_DEBUG}>)

        target_link_options(${PROJECT_NAME} PRIVATE
                                            ${BUILD_FLAGS}
                                            $<$<CONFIG:Release>:${BUILD_FLAGS_RELEASE}>
                                            $<$<CONFIG:Debug>:${BUILD_FLAGS_DEBUG}>)
                                            
endif()

target_compile_definitions(${PROJECT_NAME} PRIVATE
                                           ORGANIZATION_NAME="${ORGANIZATION_NAME}"
                                           APP_NAME="${APP_NAME}"
                                           PACKAGE_EXTENSION="${PACKAGE_EXTENSION}")

# header-only libraries should be marked as "system includes"
# to suppress compiler warnings in their code (it's not my problem after all)
target_include_directories(${PROJECT_NAME}
        SYSTEM	
        PRIVATE
        third-party/physfs/src
        third-party/physfs/extras
        third-party/libxm/include
        third-party/glad/include
        third-party/stb
)

# system libraries
find_library(MATH_LIBRARY m)
if(MATH_LIBRARY)
        target_link_libraries(${PROJECT_NAME} PUBLIC ${MATH_LIBRARY})
endif()

# third-party libraries
target_link_libraries(${PROJECT_NAME} PUBLIC
                                      SDL2::SDL2
                                      SDL2::SDL2main
                                      SDL2_image::SDL2_image
                                      SDL2_ttf::SDL2_ttf
                                      physfs-static
                                      xms
)

# copy dlls for baby windows
add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD
        COMMAND ${CMAKE_COMMAND} -E copy -t $<TARGET_FILE_DIR:${PROJECT_NAME}>
                                            $<TARGET_RUNTIME_DLLS:${PROJECT_NAME}>
        COMMAND_EXPAND_LISTS
)

# zip up assets
# currently, you must run cmake from the project root dir for this to work correctly
#file(ARCHIVE_CREATE OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/data.${PACKAGE_EXTENSION}
#                    PATHS ${PROJECT_SOURCE_DIR}/assets
#                    FORMAT zip
#)