# main2.vp — ViperFLProject fltk GUI 测试（回调 + 控件展示）
#
# 构建需 TPV/TPC 支持 project.vpj linker.static_libs 静态链接
# （本工程已配置链接 ../includes/fltk/cfltk/build 下的 cfltk2 + FLTK 静态库）。
#
# 回调说明：Viper 模块级函数可直接作为 Fl_Callback 传入（TPV 自动把函数名
# bitcast 为函数指针）。回调签名统一为 def cb(w: bytes, data: bytes)，
# 其中 w 是触发回调的控件指针，data 是注册时传入的用户数据。
import t, c
import stdlib
import viperlib
import fltk


# 模块级全局：供回调访问 main() 中创建的控件指针（回调是 C 层直接调用，
# 拿不到 main 的局部变量）；空指针用 None（C null），不能用整数 0。
term_ptr: t.CPtr = None
status_ptr: t.CPtr = None
scheme_idx: int = 0
theme_idx: int = 0


def on_btn_click(w: bytes, data: bytes):
    """按钮点击回调：改按钮文字 + 状态栏显示"""
    fltk.Fl_Widget_set_label(w, "Clicked!")
    fltk.Fl_Widget_redraw(w)
    fltk.Fl_Output_set_value(status_ptr, "Button clicked")


def on_check(w: bytes, data: bytes):
    """复选框回调：状态栏显示勾选状态"""
    v: int = fltk.Fl_Check_Button_is_checked(w)
    if v != 0:
        fltk.Fl_Output_set_value(status_ptr, "Checked")
    else:
        fltk.Fl_Output_set_value(status_ptr, "Unchecked")


def on_slider(w: bytes, data: bytes):
    """滑动条回调：状态栏实时显示数值"""
    v: t.CDouble = fltk.Fl_Slider_value(w)
    buf: bytes = stdlib.malloc(32)
    if buf is not None:
        viperlib.snprintf(buf, 32, "Slider = %.2f", v)
        fltk.Fl_Output_set_value(status_ptr, buf)
        stdlib.free(buf)


def on_go(w: bytes, data: bytes):
    """按钮回调：读取输入框文本 → 终端打印"""
    txt: str = fltk.Fl_Input_value(data)
    fltk.Fl_Terminal_append(term_ptr, "input: ")
    fltk.Fl_Terminal_append(term_ptr, txt)
    fltk.Fl_Terminal_append(term_ptr, "\n")


def on_menu_open(w: bytes, data: bytes):
    fltk.Fl_Output_set_value(status_ptr, "Menu: File/Open")


def on_menu_about(w: bytes, data: bytes):
    fltk.Fl_Output_set_value(status_ptr, "Menu: Help/About")


def on_style(w: bytes, data: bytes):
    """风格切换回调：base→plastic→gtk+→gleam→oxy 循环"""
    global scheme_idx
    scheme_idx = scheme_idx + 1
    if scheme_idx == 1:
        fltk.Fl.set_scheme("plastic")
    elif scheme_idx == 2:
        fltk.Fl.set_scheme("gtk+")
    elif scheme_idx == 3:
        fltk.Fl.set_scheme("gleam")
    elif scheme_idx == 4:
        fltk.Fl.set_scheme("oxy")
    else:
        fltk.Fl.set_scheme("base")
        scheme_idx = 0
    fltk.Fl_Output_set_value(status_ptr, f"Scheme: {fltk.Fl.scheme_string()}")


def on_theme(w: bytes, data: bytes):
    """Fl_Theme 主题切换：base→Dark→Metro 循环"""
    global theme_idx
    theme_idx = theme_idx + 1
    if theme_idx == 1:
        fltk.Fl.set_theme_dark()
    elif theme_idx == 2:
        fltk.Fl.set_theme_metro()
    else:
        fltk.Fl.set_scheme("base")
        fltk.Fl.reload_scheme()
        theme_idx = 0
    fltk.Fl_Output_set_value(status_ptr, f"Theme: {theme_idx}")


def on_tick(w: bytes, data: bytes):
    """定时器回调：每秒终端打印一次并续订"""
    fltk.Fl_Terminal_append(term_ptr, "tick\n")
    fltk.Fl.add_timeout(1.0, on_tick, 0)


def main() -> int:
    global term_ptr, status_ptr
    fltk.Fl_init_all()

    win = fltk.Fl_Window(600, 460, "Viper FLTK Demo")
    menubar = fltk.Fl_Menu_Bar(0, 0, 600, 25)
    status = fltk.Fl_Output(10, 30, 580, 25)
    btn = fltk.Fl_Button(10, 70, 120, 30, "Click Me")
    check = fltk.Fl_Check_Button(150, 70, 100, 30, "Enable")
    slider = fltk.Fl_Slider(280, 70, 200, 30)
    input_ = fltk.Fl_Input(10, 110, 210, 30, "Type here")
    go = fltk.Fl_Button(230, 110, 55, 30, "Go")
    style = fltk.Fl_Button(295, 110, 55, 30, "Style")
    theme = fltk.Fl_Button(360, 110, 55, 30, "Theme")
    spinner = fltk.Fl_Spinner(425, 110, 100, 30)
    browser = fltk.Fl_Browser(10, 150, 280, 140)
    tree = fltk.Fl_Tree(300, 150, 280, 140)
    term = fltk.Fl_Terminal(10, 300, 570, 120, "Terminal")
    win.end()

    # 保存全局指针（回调用）
    term_ptr = t.CPtr(term._ptr)
    status_ptr = t.CPtr(status._ptr)

    # 菜单（回调 + 快捷键 Ctrl+O：0x4000 | 'o'(111)）
    menubar.add("File/Open", 0x4000 | 111, 0, on_menu_open)
    menubar.add("Help/About", 0, 0, on_menu_about)

    # 回调注册
    btn.set_callback(on_btn_click, 0)
    check.set_callback(on_check, 0)
    slider.set_callback(on_slider, 0)
    go.set_callback(on_go, input_._ptr)
    style.set_callback(on_style, 0)
    theme.set_callback(on_theme, 0)

    # 数值微调框
    spinner.set_minimum(0.0)
    spinner.set_maximum(100.0)
    spinner.set_step(1.0)
    spinner.set_value(42.0)

    # 列表 + 树
    browser.add("Item 1")
    browser.add("Item 2")
    browser.add("Item 3")
    tree.add("Root/Child A/Leaf 1")
    tree.add("Root/Child B")

    # 定时器
    fltk.Fl.add_timeout(1.0, on_tick, 0)

    win.show()
    fltk.Fl.run()
    return 0