cmake_minimum_required(VERSION 3.15)
project(visibility_demo CXX)
set(CMAKE_CXX_STANDARD 17)

# ============ color ============
add_library(color
    color/src/color.cpp
    color/src/rgb_convert.cpp
)
target_include_directories(color
    PUBLIC  color/public         # 对外头目录：用户由此 #include <color/color.h>
    PRIVATE color/include        # 内部头目录：rgb_convert.h 只有 color 自己可见
)
# 宏出现在公开头文件的 #ifdef 里，决定 API 形状。
# 若只标 PRIVATE：color.cpp 编译出了 brightColorCode，
# 但用户看到的头文件里该声明被预处理掉 → 库和用户对 API 的理解不一致。
target_compile_definitions(color PUBLIC COLOR_ENABLE_BRIGHT)

# ============ timeutil ============
add_library(timeutil timeutil/timeutil.cpp)
target_include_directories(timeutil PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/timeutil)

# ============ printer ============
add_library(printer printer/src/printer.cpp)
target_include_directories(printer PUBLIC printer/public)
target_link_libraries(printer
    PUBLIC  color                # printer.h 引用了 color/color.h → 契约的一部分
    PRIVATE timeutil             # 只有 printer.cpp 用 → 实现细节
)
# 时间格式只影响 printer.cpp 的编译 → PRIVATE，不泄漏、改格式不触发下游重编
target_compile_definitions(printer PRIVATE "PRINTER_TIME_FORMAT=\"%H:%M:%S\"")

# ============ app ============
add_executable(app app/main.cpp)
target_link_libraries(app PRIVATE printer)