import pygame
import math
from .colors import *

FADE_COUNT_DOWN = 150

class Knob:
    
    def __init__(self, group, name, radius, position, value = 0):
        self.group = group
        self.name = name
        self.color = color_primary
        self.radius = radius
        self.position = position
        self.value = value
        self.focused = False
        self.count_down = FADE_COUNT_DOWN
        self.vanish_label_path = False
        self.label_path = []

    def set_value(self, value):
        self.value = value
        self.count_down = FADE_COUNT_DOWN

    def set_color(self, color):
        self.color = color

    def set_focused(self, focused):
        if focused:
            self.focused = True
            self.color = color_primary_light
        else:
            self.focused = False
            self.color = color_primary
            self.count_down = FADE_COUNT_DOWN
            if not self.vanish_label_path: self.label_path = []

    def get_position(self):
        return self.position
    
    def get_index(self, knobs):
        return knobs.index(self)

    def __eq__(self, other): 
        if other is None: return False
        return self.name == other.name

    def get_pointer_position(self):
        angle = (self.value * 0.8 * 2 + 0.7) * math.pi
        x = (self.radius - 5) * math.cos(angle) + self.position[0]
        y = (self.radius - 5) * math.sin(angle) + self.position[1]
        return(x, y)

    def display(self, surface):
        m1, m2, m3 = pygame.mouse.get_pressed(3)
        if m1:
            pos = pygame.mouse.get_pos()
            if math.sqrt(math.pow(pos[0]-self.position[0],2) + math.pow(pos[1]-self.position[1],2)) < self.radius:
                self.group.set_focused(self)
        if self.focused: self.count_down -= 1

        if self.count_down == 0:
            self.vanish_label_path = True
            self.set_focused(False)
        pygame.draw.circle(surface, self.color + (self.group.opacity,), self.position, self.radius)
        pygame.draw.line(surface, "black", self.position, self.get_pointer_position(), 4)