import pygame
import typing

from config import font_large, WHITE, BLUE, BLACK
from dataclasses import dataclass


@dataclass
class Button:
    """
    Just a button element for pygame
    Attributes:
        :param text (str): Text on the button
        :param top_left ((int, int)): the coordinates of the top-left point of the button
        :param width (int): the width of the button
        :param height (int): the height of the button
        :param padding (int): padding - the distance between rectangle border and button content
        :param bg_color (Color): the background color
        :param text_color (Color): color of the text
        :param hovered_color (Color): the background color when the button is hovered
        :param hovered_text_color (Color): the text color when the button is hovered
        :param pressed_color (Color): the background color when the button is pressed
        :param pressed_text_color (Color): the text color when the button is pressed
    """
    text: str
    top_left: typing.Tuple[int, int]
    width: int
    height: int
    padding: int = 13
    bg_color: pygame.Color = BLUE
    text_color: pygame.Color = WHITE
    hovered_color: pygame.Color = (BLUE * 3 + WHITE) // 4
    hovered_text_color: pygame.Color = BLACK
    pressed_color: pygame.Color = (BLUE + WHITE * 3) // 4
    pressed_text_color: pygame.Color = BLACK
    is_hovered: bool = False
    is_pressed: bool = False

    @property
    def bottom(self) -> int:
        """
        Return the y coordinate of the bottom of the button
        :return: y_bottom
        """
        return self.top_left[1] + self.height

    @property
    def right(self) -> int:
        """
        Return the x coordinate of the right edge of the button
        :return: x_right
        """
        return self.top_left[0] + self.width

    def get_colors(self) -> typing.Tuple[pygame.Color, pygame.Color]:
        """
        Get background and text color considering hovered and pressed states
        :return: the button's background color and the button's text color
        """
        if self.is_pressed:
            return self.pressed_color, self.pressed_text_color
        if self.is_hovered:
            return self.hovered_color, self.hovered_text_color
        return self.bg_color, self.text_color

    def render(self) -> pygame.Surface:
        """
        Draw the button
        :return: a pygame surface with the button
        """
        surface: pygame.Surface = pygame.Surface((self.width, self.height))
        bg_color, text_color = self.get_colors()
        surface.fill(bg_color)
        text_surface: pygame.Surface = font_large.render(self.text, True, text_color)
        text_height: int = self.height - 2 * self.padding
        text_width: int = round(text_surface.get_width() * text_height / text_surface.get_height())
        text_surface: pygame.Surface = pygame.transform.scale(text_surface, (text_width, text_height))
        surface.blit(text_surface, ((self.width - text_width) // 2, self.padding))
        return surface

    def process_event(self, event: pygame.event.Event) -> bool:
        """
        Process a pygame event. If it's a click on this button, return true
        :param event: a pygame event
        :return: True if there was a click on the button
        """
        # if this is a mouse event
        if event.type in [pygame.MOUSEBUTTONUP, pygame.MOUSEMOTION, pygame.MOUSEBUTTONDOWN]:
            # if the mouse event is inside the button
            if self.top_left[0] <= event.pos[0] < self.right and self.top_left[1] <= event.pos[1] < self.bottom:
                if event.type == pygame.MOUSEBUTTONUP:
                    self.is_pressed = False
                    return True
                elif event.type == pygame.MOUSEBUTTONDOWN:
                    self.is_hovered = False
                    self.is_pressed = True
                elif event.type == pygame.MOUSEMOTION:
                    self.is_hovered = True
            else:
                self.is_hovered = False
        return False