cmake_minimum_required(VERSION 3.20)

# -----------------------------
# Force Clang before project()
# -----------------------------
if(NOT DEFINED CMAKE_C_COMPILER)
    set(CMAKE_C_COMPILER clang CACHE STRING "" FORCE)
endif()
if(NOT DEFINED CMAKE_CXX_COMPILER)
    set(CMAKE_CXX_COMPILER clang++ CACHE STRING "" FORCE)
endif()

# -----------------------------
# Project setup
# -----------------------------
project(exalock LANGUAGES C CXX)
set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE Release)
endif()

# -----------------------------
# Vendored dependencies (submodules)
# -----------------------------
add_subdirectory(external/spdlog)
add_subdirectory(external/tomlplusplus)
add_subdirectory(external/glm)

# stb is header-only
add_library(stb INTERFACE)
target_include_directories(stb INTERFACE external/stb)

# -----------------------------
# GLAD (official CMake integration)
# -----------------------------
add_subdirectory(external/glad/cmake)

# For OpenGL ES 2.0:
glad_add_library(glad_gles2 STATIC API gles2=2.0)

# For desktop OpenGL 3.3 core profile, you could use:
# glad_add_library(glad_gl33 STATIC API gl:core=3.3)

# -----------------------------
# System dependencies (ABI-bound)
# -----------------------------
find_package(PkgConfig REQUIRED)

pkg_check_modules(WAYLAND REQUIRED
    wayland-client
    wayland-egl
)
pkg_check_modules(EGL REQUIRED egl)
pkg_check_modules(GLES REQUIRED glesv2)
pkg_check_modules(XKB REQUIRED xkbcommon)
pkg_check_modules(PAM REQUIRED pam)
pkg_check_modules(FREETYPE REQUIRED freetype2)
pkg_check_modules(HARFBUZZ REQUIRED harfbuzz)
pkg_check_modules(FONTCONFIG REQUIRED fontconfig)

# -----------------------------
# Executable
# -----------------------------
add_executable(${PROJECT_NAME} src/main.cpp)

# -----------------------------
# Auto-discover other source files
# -----------------------------
file(GLOB_RECURSE ALL_CPP "${CMAKE_CURRENT_SOURCE_DIR}/src/*.cpp")
list(REMOVE_ITEM ALL_CPP "${CMAKE_CURRENT_SOURCE_DIR}/src/main.cpp")
target_sources(${PROJECT_NAME} PRIVATE ${ALL_CPP})

# -----------------------------
# Include directories
# -----------------------------
target_include_directories(${PROJECT_NAME} PRIVATE
    src
    ${WAYLAND_INCLUDE_DIRS}
    ${EGL_INCLUDE_DIRS}
    ${GLES_INCLUDE_DIRS}
    ${XKB_INCLUDE_DIRS}
    ${PAM_INCLUDE_DIRS}
    ${FREETYPE_INCLUDE_DIRS}
    ${HARFBUZZ_INCLUDE_DIRS}
    ${FONTCONFIG_INCLUDE_DIRS}
)

# -----------------------------
# Link libraries
# -----------------------------
target_link_libraries(${PROJECT_NAME} PRIVATE
    spdlog::spdlog
    tomlplusplus::tomlplusplus
    glm::glm
    stb
    glad_gles2
    ${WAYLAND_LIBRARIES}
    ${EGL_LIBRARIES}
    ${GLES_LIBRARIES}
    ${XKB_LIBRARIES}
    ${PAM_LIBRARIES}
    ${FREETYPE_LIBRARIES}
    ${HARFBUZZ_LIBRARIES}
    ${FONTCONFIG_LIBRARIES}
)

# -----------------------------
# Compiler warnings
# -----------------------------
if(CMAKE_CXX_COMPILER_ID MATCHES "Clang|GNU")
    target_compile_options(${PROJECT_NAME} PRIVATE
        -Wall
        -Wextra
        -Wpedantic
        -Wconversion
        -Wshadow
        -Wnull-dereference
        -Wdouble-promotion
    )
endif()