# 防止重复引用
if(IR_ALREADY_INCLUDED)
  return()
endif()
set(IR_ALREADY_INCLUDED 1)

# find_path 搜索包含某个文件的路径
# 如果在某个路径下发现了该文件，该结果会被存储到该变量中；如果没有找到，存储的结果将会是<VAR>-NOTFOUND
find_path(IR_DIRS
    NAMES
        Optical-RMC-Code.exe
    PATHS
        ${CMAKE_SOURCE_DIR}/extlib/IR 
    NO_SYSTEM_ENVIRONMENT_PATH
    NO_CMAKE_SYSTEM_PATH
)

# IR版本号设置
set(IR_VERSION_MAJOR 1)
set(IR_VERSION_MINOR 0)
set(IR_VERSION_PATCH 0)
set(IR_VERSION "${IR_VERSION_MAJOR}.${IR_VERSION_MINOR}.${IR_VERSION_PATCH}")

if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
    set(IR_EXECUTABLE "${IR_DIRS}/Optical-RMC-Code.exe")
endif()

include(FindPackageHandleStandardArgs)

# 如果找到所有需要的变量，并且版本匹配，则将IR_FOUND变量设置为TRUE
find_package_handle_standard_args(IR
    FOUND_VAR
        IR_FOUND
    REQUIRED_VARS
        IR_DIRS
        IR_EXECUTABLE
    VERSION_VAR
        IR_VERSION
)