from guizero import App, Text, TextBox, PushButton, Box, Combo, CheckBox, Slider, MenuBar , Window

def open_file():
    with open(file_name.value, "r") as f:
        editor.value = f.read()
        app.info("info", "File Opened")
    save_button.disable()

def save_file():
    with open(file_name.value, "w") as f:
        f.write(editor.value)
        app.info("info", "File Saved")
    save_button.disable()
    open_button.enable()


def enable_save():
    open_button.disable() # changes in text - "Open Button" disabled to not lose changes
    save_button.enable()

def change_font():
    editor.font = font.value

def change_text_size():
    editor.text_size = size.value
    editor.resize(1, 1)
    editor.resize("fill", "fill")

def change_text_color():
    editor.text_color = font_color.value

def change_background_color():
    editor.bg = background_color.value

# A new functions that changes appearance or closes the app
def big_window():
    app.width = 1200
    app.height = 800
    app.text_size  = 16
    preferences_controls = Box(app, align="bottom", width="fill", border=True)

def small_window():
    app.width = 600
    app.height = 400
    app.text_size  = 8
    preferences_controls = Box(app, align="bottom", width="fill", border=True)

def dark_theme():
    app.bg = "black"
    app.text_color = "white"

def close_editor():
    app.destroy()


def exit_app():
    def close_warn_window():
        warn_window.destroy()
    if save_button.enabled == True:
        warn_window = Window(app,title="File not saved", bg="red", height =40)
        save_button2 = PushButton(warn_window, text="Save", command=save_file, align="right")
        exit_button = PushButton(warn_window, text="Exit without Save", command=close_editor, align="right")
        close_warn_window = PushButton(warn_window, text="Close It", command=close_warn_window, align="left")
    if save_button.enabled == False:
        close_editor()

app = App(title="GuiZeroTextEditor_v5" , width=900, height=700)

# The new MenuBar
menubar = MenuBar(app,
                  toplevel=["File" ,"Editor appearance" ],
                  options=[
                  [ ["open",open_file], ["save",save_file],["exit",exit_app] ],
                  [ ["Big window",big_window], ["Small window",small_window], ["Dark theme", dark_theme] ]
                  ])

file_controls = Box(app, align="top", width="fill", border=True)
file_name = TextBox(file_controls, text="text_file.txt", width=50, align="left")
save_button = PushButton(file_controls, text="Save", command=save_file, align="right")
open_button = PushButton(file_controls, text="Open", command=open_file, align="right")


editor = TextBox(app, multiline=True, height="fill", width="fill", command=enable_save)

preferences_controls = Box(app, align="bottom", width="fill", border=True)
font_name = Text(preferences_controls, text="Font:" , align ="left")
font = Combo(preferences_controls, options=["Courier", "Times New Roman", "Verdana", "Piboto Condensed"], align="left", command=change_font)
font_color_text = Text(preferences_controls, text="Font color:" , align ="left")
font_color = Combo(preferences_controls, options=["black", "red", "green" , "blue" , "yellow"], align="left", command=change_text_color)
background_color_text = Text(preferences_controls, text="Background color:" , align ="left")
background_color = Combo(preferences_controls, options=["white", "black"], align="left", command=change_background_color)
size = Slider(preferences_controls,  align="left", start = 10, end = 42, command=change_text_size)

save_button.disable() #nothing in editor - no save possibility
app.display()