# 抽卡世界 GUI 教程 —— 总 CMake
# 用法：cmake -B build -DLESSON=1     ← 切到第 1 课（默认 1）
#       cmake --build build
#       ./build/gacha1                 ← Mac/Linux
#       build\Release\gacha1.exe       ← Windows
#
# 想看「老师写好的完整版」：cmake -B build -DLESSON=1 -DUSE_SOLUTION=ON

cmake_minimum_required(VERSION 3.14)
project(gacha LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# Windows MSVC：让源码里的中文（UTF-8）正确编译
if(MSVC)
    add_compile_options("/utf-8")
endif()

# ===== 找 FLTK =====
# 先试 CONFIG（vcpkg / 自己编 FLTK 1.4 时会有 FLTKConfig.cmake）
# 找不到再回退到 CMake 自带的 FindFLTK 模块（Homebrew 走这条）
find_package(FLTK CONFIG QUIET)
if(NOT FLTK_FOUND)
    find_package(FLTK REQUIRED)
endif()

# ===== 选课 =====
set(LESSON 1 CACHE STRING "Which lesson to build: 1, 2, 3, 4, 5, 6")
option(USE_SOLUTION "Build from solutions/ instead of student starter file" OFF)

set(TARGET_NAME gacha${LESSON})

if(USE_SOLUTION)
    set(SRC_FILE solutions/lesson_gui_${LESSON}.cpp)
else()
    set(SRC_FILE lesson_gui_${LESSON}.cpp)
endif()

if(NOT EXISTS "${CMAKE_SOURCE_DIR}/${SRC_FILE}")
    message(FATAL_ERROR "找不到源文件：${SRC_FILE}\n请确认 LESSON=${LESSON} 是否正确，或文件是否存在。")
endif()

message(STATUS "Building lesson ${LESSON}: ${SRC_FILE}")

add_executable(${TARGET_NAME} ${SRC_FILE})

if(TARGET fltk)
    # CONFIG 模式：imported target 自带头文件路径
    target_link_libraries(${TARGET_NAME} PRIVATE fltk)
else()
    # 模块模式：手动加头文件路径和库
    target_include_directories(${TARGET_NAME} PRIVATE ${FLTK_INCLUDE_DIR})
    target_link_libraries(${TARGET_NAME} PRIVATE ${FLTK_LIBRARIES})
    # Homebrew 的 FLTK 头文件是 *.H，教程里写 #include <FL/Fl.h> 会触发可移植性警告
    # 在 AppleClang 下静音这个无害告警
    if(APPLE)
        target_compile_options(${TARGET_NAME} PRIVATE
            $<$<CXX_COMPILER_ID:AppleClang>:-Wno-nonportable-include-path>)
    endif()
endif()

# macOS SDK 把 sprintf 标为 deprecated（让用 snprintf）
# 对 11 岁初学者来说 sprintf 已经够用且写法简单，统一屏蔽这个告警
if(APPLE)
    target_compile_options(${TARGET_NAME} PRIVATE
        $<$<CXX_COMPILER_ID:AppleClang>:-Wno-deprecated-declarations>)
endif()