cmake_minimum_required(VERSION 3.20)
project(sdl3_flecs_template VERSION 1.0.0 LANGUAGES CXX)

# C++ Standard
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# Build type defaults to Debug
if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE Debug)
endif()

# Compiler warnings
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
    add_compile_options(-Wall -Wextra -Wpedantic)
    if(CMAKE_BUILD_TYPE STREQUAL "Debug")
        add_compile_options(-g -O0)
    else()
        add_compile_options(-O2)
    endif()
elseif(MSVC)
    add_compile_options(/W4)
endif()

# =============================================================================
# Dependencies
# =============================================================================

# SDL3 - Using FetchContent for automatic download
include(FetchContent)

# SDL3
FetchContent_Declare(
    SDL3
    GIT_REPOSITORY https://github.com/libsdl-org/SDL.git
    GIT_TAG main
    GIT_SHALLOW TRUE
    GIT_PROGRESS TRUE
)

set(SDL_SHARED OFF CACHE BOOL "" FORCE)
set(SDL_STATIC ON CACHE BOOL "" FORCE)
set(SDL_TEST OFF CACHE BOOL "" FORCE)

# Platform-specific SDL backends
if(EMSCRIPTEN)
    set(SDL_X11 OFF CACHE BOOL "" FORCE)
    set(SDL_WAYLAND OFF CACHE BOOL "" FORCE)
else()
    # Disable X11, use Wayland only on Linux
    set(SDL_X11 OFF CACHE BOOL "" FORCE)
    set(SDL_WAYLAND ON CACHE BOOL "" FORCE)
endif()

FetchContent_MakeAvailable(SDL3)

# FLECS
FetchContent_Declare(
    flecs
    GIT_REPOSITORY https://github.com/SanderMertens/flecs.git
    GIT_TAG master
    GIT_SHALLOW TRUE
    GIT_PROGRESS TRUE
)

FetchContent_MakeAvailable(flecs)

# =============================================================================
# Main Executable
# =============================================================================

add_executable(${PROJECT_NAME}
    src/main.cpp
    src/game.cpp
    src/systems.cpp
    src/pipeline.cpp
)

target_include_directories(${PROJECT_NAME} PRIVATE
    ${CMAKE_CURRENT_SOURCE_DIR}/include
)

target_link_libraries(${PROJECT_NAME} PRIVATE
    SDL3::SDL3-static
    flecs::flecs_static
)

# Platform-specific settings
if(EMSCRIPTEN)
    set_target_properties(${PROJECT_NAME} PROPERTIES SUFFIX ".html")
    target_link_options(${PROJECT_NAME} PRIVATE
        -sUSE_SDL=0
        -sALLOW_MEMORY_GROWTH=1
        -sTOTAL_MEMORY=67108864
        -sMAX_WEBGL_VERSION=2
        --shell-file ${CMAKE_CURRENT_SOURCE_DIR}/web/shell.html
    )
elseif(WIN32)
    target_link_libraries(${PROJECT_NAME} PRIVATE winmm imm32 version setupapi)
elseif(UNIX AND NOT APPLE)
    find_package(PkgConfig REQUIRED)
    # Linux dependencies are handled by SDL3
endif()

# =============================================================================
# Install
# =============================================================================

install(TARGETS ${PROJECT_NAME}
    RUNTIME DESTINATION bin
)

# =============================================================================
# CPack (optional packaging)
# =============================================================================

set(CPACK_PROJECT_NAME ${PROJECT_NAME})
set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})
include(CPack)