import tkinter as tk
from tkinter import ttk
from PIL import Image, ImageDraw, ImageChops

from .base import View

class CircleView(View):

    def __init__(self, parent, size, center, radius_offset=10, **kwargs):
        self.target_radius = min(center) - radius_offset
        super().__init__(parent, size, center, **kwargs)

    def init_ui(self, parent):
        self.ui = tk.Frame(parent)
        self.ui.pack()
        self.target_label = ttk.Label(self.ui, text="Target (g)")
        self.target_label.pack(side=tk.LEFT)
        self.target = ttk.Entry(self.ui)
        self.target.insert(0, 100.0)
        self.target.pack(side=tk.LEFT)

    def _init_im(self):
        im = Image.new('1', self.size, 'white')
        draw = ImageDraw.Draw(im)
        draw.circle(self.center, self.target_radius,
                     outline="#000000")
        return im
    
    def update_weight(self, weight):
        weight_radius = 0.0
        bkg_im = self.bkg_im.copy()
        try:
            target = float(self.target.get())
            weight_radius = weight / target * self.target_radius

            im = Image.new('1', self.size, 'black')
            draw = ImageDraw.Draw(im)

            if weight_radius > 0.1:
                draw.circle(self.center, weight_radius, fill="#FFFFFF")
            
                return ImageChops.logical_xor(bkg_im, im)

        except Exception as e:
            print('Invalid target value:', e)
            pass
        return bkg_im