import time
import typing

import pygame

from config import font, MESSAGE_HEIGHT, WIDTH, CHAT_SELECTOR_WIDTH, HEIGHT, WHITE, DARKER_BLUE, GREY
from utils import render_text

from dataclasses import dataclass


@dataclass
class TextField:
    """
    Field for message input
    """
    value: str = ''
    width: int = WIDTH - CHAT_SELECTOR_WIDTH - 140
    height: int = MESSAGE_HEIGHT * 1.5
    top_left_corner: typing.Tuple[int, int] = (CHAT_SELECTOR_WIDTH, HEIGHT - MESSAGE_HEIGHT * 2)
    is_focused: bool = False
    placeholder: str = ''
    cursor_position: int = 0

    def render(self) -> pygame.Surface:
        """
        Render the text field onto a pygame surface
        :return: a surface with the field
        """
        surface = pygame.Surface((self.width, self.height))
        surface.fill(WHITE)
        padding = 5
        pygame.draw.rect(surface, DARKER_BLUE, (padding, padding, self.width - padding * 2, self.height - padding * 2))
        if not self.value and self.placeholder:
            placeholder_text: pygame.Surface = font.render(self.placeholder, True, (GREY + WHITE) // 2)
            surface.blit(
                placeholder_text,
                (
                    (self.width - placeholder_text.get_width()) // 2,
                    (self.height - placeholder_text.get_height()) // 2
                )
            )
        if self.value:
            render_text(surface, (10, 10), font, self.value, WHITE, self.cursor_position if time.time() % 1 < 0.5 else None)
        return surface

    def process_event(self, event: pygame.event.Event):
        """
        Handle a typing event or a click (to focus)
        :param event: a pygame event
        """
        # If we have a click, we should focus the field if the click was inside or unfocus if it was outside
        if event.type == pygame.MOUSEBUTTONUP:
            self.is_focused = self.top_left_corner[0] <= event.pos[0] < self.top_left_corner[0] + self.width \
                              and self.top_left_corner[1] <= event.pos[1] < self.top_left_corner[1] + self.height
        if self.is_focused and hasattr(event, 'key') and event.type == 768:
            if event.key == pygame.K_BACKSPACE:
                self.value = self.value[:-1]
                self.cursor_position -= 1
            elif event.key == pygame.K_LEFT:
                self.cursor_position -= 1
            elif event.key == pygame.K_RIGHT:
                self.cursor_position += 1
            elif event.unicode:
                self.value = self.value[:self.cursor_position] + event.unicode + self.value[self.cursor_position:]
                self.cursor_position += 1
            self.cursor_position = max(0, min(self.cursor_position, len(self.value)))

    def collect(self) -> str:
        """
        Get the current value and clear the field
        :return: the value of the text input
        """
        value = self.value
        self.value = ''
        self.cursor_position = 0
        return value