import tkinter
import sys
import os
import platform
import ctypes
from typing import Union, Tuple, Optional
from packaging import version

from .widgets.theme import ThemeManager
from .widgets.scaling import CTkScalingBaseClass
from .widgets.appearance_mode import CTkAppearanceModeBaseClass

from customtkinter.windows.widgets.utility.utility_functions import pop_from_dict_by_set, check_kwargs_empty

CTK_PARENT_CLASS = tkinter.Tk


class CTk(CTK_PARENT_CLASS, CTkAppearanceModeBaseClass, CTkScalingBaseClass):
    """
    Main app window with dark titlebar on Windows and macOS.
    For detailed information check out the documentation.
    """

    _valid_tk_constructor_arguments: set = {"screenName", "baseName", "className", "useTk", "sync", "use"}

    _valid_tk_configure_arguments: set = {'bd', 'borderwidth', 'class', 'menu', 'relief', 'screen',
                                          'use', 'container', 'cursor', 'height',
                                          'highlightthickness', 'padx', 'pady', 'takefocus', 'visual', 'width'}

    _deactivate_macos_window_header_manipulation: bool = False
    _deactivate_windows_window_header_manipulation: bool = False

    def __init__(self,
                 fg_color: Optional[Union[str, Tuple[str, str]]] = None,
                 **kwargs):

        self._enable_macos_dark_title_bar()

        # call init methods of super classes
        CTK_PARENT_CLASS.__init__(self, **pop_from_dict_by_set(kwargs, self._valid_tk_constructor_arguments))
        CTkAppearanceModeBaseClass.__init__(self)
        CTkScalingBaseClass.__init__(self, scaling_type="window")
        check_kwargs_empty(kwargs, raise_error=True)

        self._current_width = 600  # initial window size, independent of scaling
        self._current_height = 500
        self._min_width: int = 0
        self._min_height: int = 0
        self._max_width: int = 1_000_000
        self._max_height: int = 1_000_000
        self._last_resizable_args: Union[Tuple[list, dict], None] = None  # (args, kwargs)

        self._fg_color = ThemeManager.theme["CTk"]["fg_color"] if fg_color is None else self._check_color_type(fg_color)

        # set bg of tkinter.Tk
        super().configure(bg=self._apply_appearance_mode(self._fg_color))

        # set title
        self.title("CTk")

        # indicator variables
        self._iconbitmap_method_called = False  # indicates if wm_iconbitmap method got called
        self._state_before_windows_set_titlebar_color = None
        self._window_exists = False  # indicates if the window is already shown through update() or mainloop() after init
        self._withdraw_called_before_window_exists = False  # indicates if withdraw() was called before window is first shown through update() or mainloop()
        self._iconify_called_before_window_exists = False  # indicates if iconify() was called before window is first shown through update() or mainloop()
        self._block_update_dimensions_event = False

        # save focus before calling withdraw
        self.focused_widget_before_widthdraw = None

        # set CustomTkinter titlebar icon (Windows only)
        if sys.platform.startswith("win"):
            self.after(200, self._windows_set_titlebar_icon)

        # set titlebar color (Windows only)
        if sys.platform.startswith("win"):
            self._windows_set_titlebar_color(self._get_appearance_mode())

        self.bind('<Configure>', self._update_dimensions_event)
        self.bind('<FocusIn>', self._focus_in_event)
        #allows CTkEntry and CTkTextbox to lose focus
        def set_focus(event: tkinter.Event):
            if hasattr(event.widget, "focus_set"):
                event.widget.focus_set()
        self.bind_all("<Button-1>", set_focus, add=True)

    def destroy(self):
        self._disable_macos_dark_title_bar()

        # call destroy methods of super classes
        tkinter.Tk.destroy(self)
        CTkAppearanceModeBaseClass.destroy(self)
        CTkScalingBaseClass.destroy(self)

    def _focus_in_event(self, event):
        # sometimes window looses jumps back on macOS if window is selected from Mission Control, so has to be lifted again
        if sys.platform == "darwin":
            self.lift()

    def _update_dimensions_event(self, event=None):
        if not self._block_update_dimensions_event:

            detected_width = super().winfo_width()  # detect current window size
            detected_height = super().winfo_height()

            # detected_width = event.width
            # detected_height = event.height

            if self._current_width != self._reverse_window_scaling(detected_width) or self._current_height != self._reverse_window_scaling(detected_height):
                self._current_width = self._reverse_window_scaling(detected_width)  # adjust current size according to new size given by event
                self._current_height = self._reverse_window_scaling(detected_height)  # _current_width and _current_height are independent of the scale

    def _set_scaling(self, new_widget_scaling, new_window_scaling):
        super()._set_scaling(new_widget_scaling, new_window_scaling)

        # Force new dimensions on window by using min, max, and geometry. Without min, max it won't work.
        super().minsize(self._apply_window_scaling(self._current_width), self._apply_window_scaling(self._current_height))
        super().maxsize(self._apply_window_scaling(self._current_width), self._apply_window_scaling(self._current_height))

        super().geometry(f"{self._apply_window_scaling(self._current_width)}x{self._apply_window_scaling(self._current_height)}")

        # set new scaled min and max with delay (delay prevents weird bug where window dimensions snap to unscaled dimensions when mouse releases window)
        self.after(1000, self._set_scaled_min_max)  # Why 1000ms delay? Experience! (Everything tested on Windows 11)

    def block_update_dimensions_event(self):
        self._block_update_dimensions_event = False

    def unblock_update_dimensions_event(self):
        self._block_update_dimensions_event = False

    def _set_scaled_min_max(self):
        if self._min_width is not None or self._min_height is not None:
            super().minsize(self._apply_window_scaling(self._min_width), self._apply_window_scaling(self._min_height))
        if self._max_width is not None or self._max_height is not None:
            super().maxsize(self._apply_window_scaling(self._max_width), self._apply_window_scaling(self._max_height))

    def withdraw(self):
        if self._window_exists is False:
            self._withdraw_called_before_window_exists = True
        super().withdraw()

    def iconify(self):
        if self._window_exists is False:
            self._iconify_called_before_window_exists = True
        super().iconify()

    def update(self):
        if self._window_exists is False:
            if sys.platform.startswith("win"):
                if not self._withdraw_called_before_window_exists and not self._iconify_called_before_window_exists:
                    # print("window dont exists -> deiconify in update")
                    self.deiconify()

            self._window_exists = True

        super().update()

    def mainloop(self, *args, **kwargs):
        if not self._window_exists:
            if sys.platform.startswith("win"):
                self._windows_set_titlebar_color(self._get_appearance_mode())

                if not self._withdraw_called_before_window_exists and not self._iconify_called_before_window_exists:
                    # print("window dont exists -> deiconify in mainloop")
                    self.deiconify()

            self._window_exists = True

        super().mainloop(*args, **kwargs)

    def resizable(self, width: bool = None, height: bool = None):
        current_resizable_values = super().resizable(width, height)
        self._last_resizable_args = ([], {"width": width, "height": height})

        if sys.platform.startswith("win"):
            self._windows_set_titlebar_color(self._get_appearance_mode())

        return current_resizable_values

    def minsize(self, width: int = None, height: int = None):
        self._min_width = width
        self._min_height = height
        if self._current_width < width:
            self._current_width = width
        if self._current_height < height:
            self._current_height = height
        super().minsize(self._apply_window_scaling(self._min_width), self._apply_window_scaling(self._min_height))

    def maxsize(self, width: int = None, height: int = None):
        self._max_width = width
        self._max_height = height
        if self._current_width > width:
            self._current_width = width
        if self._current_height > height:
            self._current_height = height
        super().maxsize(self._apply_window_scaling(self._max_width), self._apply_window_scaling(self._max_height))

    def geometry(self, geometry_string: str = None):
        if geometry_string is not None:
            super().geometry(self._apply_geometry_scaling(geometry_string))

            # update width and height attributes
            width, height, x, y = self._parse_geometry_string(geometry_string)
            if width is not None and height is not None:
                self._current_width = max(self._min_width, min(width, self._max_width))  # bound value between min and max
                self._current_height = max(self._min_height, min(height, self._max_height))
        else:
            return self._reverse_geometry_scaling(super().geometry())

    def configure(self, **kwargs):
        if "fg_color" in kwargs:
            self._fg_color = self._check_color_type(kwargs.pop("fg_color"))
            super().configure(bg=self._apply_appearance_mode(self._fg_color))

            for child in self.winfo_children():
                try:
                    child.configure(bg_color=self._fg_color)
                except Exception:
                    pass

        super().configure(**pop_from_dict_by_set(kwargs, self._valid_tk_configure_arguments))
        check_kwargs_empty(kwargs)

    def cget(self, attribute_name: str) -> any:
        if attribute_name == "fg_color":
            return self._fg_color

        else:
            return super().cget(attribute_name)

    def wm_iconbitmap(self, bitmap=None, default=None):
        self._iconbitmap_method_called = True
        super().wm_iconbitmap(bitmap, default)

    def iconbitmap(self, bitmap=None, default=None):
        self._iconbitmap_method_called = True
        super().wm_iconbitmap(bitmap, default)

    def _windows_set_titlebar_icon(self):
        try:
            # if not the user already called iconbitmap method, set icon
            if not self._iconbitmap_method_called:
                customtkinter_directory = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
                self.iconbitmap(os.path.join(customtkinter_directory, "assets", "icons", "CustomTkinter_icon_Windows.ico"))
        except Exception:
            pass

    @classmethod
    def _enable_macos_dark_title_bar(cls):
        if sys.platform == "darwin" and not cls._deactivate_macos_window_header_manipulation:  # macOS
            if version.parse(platform.python_version()) < version.parse("3.10"):
                if version.parse(tkinter.Tcl().call("info", "patchlevel")) >= version.parse("8.6.9"):  # Tcl/Tk >= 8.6.9
                    os.system("defaults write -g NSRequiresAquaSystemAppearance -bool No")
                    # This command allows dark-mode for all programs

    @classmethod
    def _disable_macos_dark_title_bar(cls):
        if sys.platform == "darwin" and not cls._deactivate_macos_window_header_manipulation:  # macOS
            if version.parse(platform.python_version()) < version.parse("3.10"):
                if version.parse(tkinter.Tcl().call("info", "patchlevel")) >= version.parse("8.6.9"):  # Tcl/Tk >= 8.6.9
                    os.system("defaults delete -g NSRequiresAquaSystemAppearance")
                    # This command reverts the dark-mode setting for all programs.

    def _windows_set_titlebar_color(self, color_mode: str):
        """
        Set the titlebar color of the window to light or dark theme on Microsoft Windows.

        Credits for this function:
        https://stackoverflow.com/questions/23836000/can-i-change-the-title-bar-in-tkinter/70724666#70724666

        MORE INFO:
        https://docs.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwmwindowattribute
        """

        if sys.platform.startswith("win") and not self._deactivate_windows_window_header_manipulation:

            if self._window_exists:
                self._state_before_windows_set_titlebar_color = self.state()
                # print("window_exists -> state_before_windows_set_titlebar_color: ", self.state_before_windows_set_titlebar_color)

                if self._state_before_windows_set_titlebar_color != "iconic" or self._state_before_windows_set_titlebar_color != "withdrawn":
                    self.focused_widget_before_widthdraw = self.focus_get()
                    super().withdraw()  # hide window so that it can be redrawn after the titlebar change so that the color change is visible
            else:
                # print("window dont exists -> withdraw and update")
                self.focused_widget_before_widthdraw = self.focus_get()
                super().withdraw()
                super().update()

            if color_mode.lower() == "dark":
                value = 1
            elif color_mode.lower() == "light":
                value = 0
            else:
                return

            try:
                hwnd = ctypes.windll.user32.GetParent(self.winfo_id())
                DWMWA_USE_IMMERSIVE_DARK_MODE = 20
                DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1 = 19

                # try with DWMWA_USE_IMMERSIVE_DARK_MODE
                if ctypes.windll.dwmapi.DwmSetWindowAttribute(hwnd, DWMWA_USE_IMMERSIVE_DARK_MODE,
                                                              ctypes.byref(ctypes.c_int(value)),
                                                              ctypes.sizeof(ctypes.c_int(value))) != 0:

                    # try with DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20h1
                    ctypes.windll.dwmapi.DwmSetWindowAttribute(hwnd, DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1,
                                                               ctypes.byref(ctypes.c_int(value)),
                                                               ctypes.sizeof(ctypes.c_int(value)))

            except Exception as err:
                print(err)

            if self._window_exists or True:
                # print("window_exists -> return to original state: ", self.state_before_windows_set_titlebar_color)
                if self._state_before_windows_set_titlebar_color == "normal":
                    self.deiconify()
                elif self._state_before_windows_set_titlebar_color == "iconic":
                    self.iconify()
                elif self._state_before_windows_set_titlebar_color == "zoomed":
                    self.state("zoomed")
                else:
                    self.state(self._state_before_windows_set_titlebar_color)  # other states
            else:
                pass  # wait for update or mainloop to be called

            if self.focused_widget_before_widthdraw is not None:
                self.after(1, self.focused_widget_before_widthdraw.focus)
                self.focused_widget_before_widthdraw = None

    def _set_appearance_mode(self, mode_string: str):
        super()._set_appearance_mode(mode_string)

        if sys.platform.startswith("win"):
            self._windows_set_titlebar_color(mode_string)

        super().configure(bg=self._apply_appearance_mode(self._fg_color))
