# ==============================================================================
# Platform Detection
# ==============================================================================
# This module detects the current platform and compiler, setting IS_* variables
# that can be used throughout the build system for conditional logic.
#
# Compiler flags set:
#   IS_CLANG_OR_GCC  - TRUE if using Clang or GCC compiler
#   IS_MSVC          - TRUE if using Microsoft Visual C++ compiler
#
# Platform flags set:
#   IS_WINDOWS       - TRUE if building for Windows
#   IS_LINUX         - TRUE if building for Linux
#   IS_MACOS         - TRUE if building for macOS
#   IS_IOS           - TRUE if building for iOS
# ==============================================================================

# ------------------------------------------------------------------------------
# Compiler Detection
# ------------------------------------------------------------------------------
set(IS_CLANG_OR_GCC FALSE)
set(IS_MSVC         FALSE)

if(MSVC)
    set(IS_MSVC TRUE)
elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang|GNU")
    set(IS_CLANG_OR_GCC TRUE)
endif()

# ------------------------------------------------------------------------------
# Platform Detection
# ------------------------------------------------------------------------------
set(IS_WINDOWS FALSE)
set(IS_LINUX   FALSE)
set(IS_MACOS   FALSE)
set(IS_IOS     FALSE)

if(ANDROID)
    message(FATAL_ERROR "Android is not supported by xone_macos!")
elseif(APPLE)
    if(IOS)
        message(STATUS "Platform: iOS")
        set(IS_IOS TRUE)
    else()
        message(STATUS "Platform: macOS")
        set(IS_MACOS TRUE)
    endif()
elseif(WIN32)
    message(FATAL_ERROR "xone_macos only builds on macOS!")
elseif(UNIX)
    message(FATAL_ERROR "xone_macos only builds on macOS!")
else()
    message(FATAL_ERROR "Unknown platform!")
endif()