import tkinter as tk
from tkinter import ttk
import threading

from .serial_reader import WeightReader
from .config import DEFAULT_CALIB, DISPLAY_TYPES

class WeightApp(tk.Tk):
    def __init__(self, weight_reader):
        super().__init__()
        self.weight_reader: WeightReader = weight_reader
        
        self.toolbar = tk.Frame(self, padx=10)
        self.toolbar.pack(side=tk.LEFT)
        
        #### Connection Settings ####
        self.connection_settings = tk.Frame(self.toolbar, pady=10)
        self.scan_ports_button = ttk.Button(self.connection_settings, text="Scan Devices", command=self.update_devices)
        self.scan_ports_button.pack()
        self.port_label = ttk.Label(self.connection_settings, text="Port:")
        self.port_label.pack(side=tk.LEFT)
        self.port = ttk.Combobox(self.connection_settings, values=[])
        self.update_devices()
        self.port.pack(side=tk.LEFT)
        self.connection_settings.pack()
        self.connect_button = ttk.Button(self.toolbar, text="Connect", command=self.connect)
        self.connect_button.pack()

        #### Weight Reader Settings ####
        self.reader_settings = tk.Frame(self.toolbar, pady=30)
        self.reader_settings.pack()
        
        self.calib_factor = tk.Frame(self.reader_settings)
        self.calib_factor.pack()
        self.calib_label = ttk.Label(self.calib_factor, text="Calibration Factor:")
        self.calib_label.pack()
        self.calib_weight = ttk.Combobox(self.calib_factor, values=[100], width=5)
        self.calib_weight.set(100)
        self.calib_weight.pack(side=tk.LEFT)
        self.calib_measurements = ttk.Entry(self.calib_factor)
        self.calib_measurements.insert(0, DEFAULT_CALIB)
        self.calib_measurements.pack(side=tk.LEFT)
        self.update_calib_button = ttk.Button(self.reader_settings, text="Update Calibration", command=self.update_calib)
        self.update_calib_button.pack()
        
        self.display_type = tk.Frame(self.toolbar, pady=20)
        self.display_type.pack()
        self.display_type_label = ttk.Label(self.display_type, text="Visual:")
        self.display_type_label.pack(side=tk.LEFT)
        self.display_type_select = ttk.Combobox(self.display_type, values=[t.value for t in DISPLAY_TYPES])
        self.display_type_select.set(DISPLAY_TYPES.NUMBER.value)
        self.display_type_select.pack(side=tk.LEFT)

        
        #### Display ####
        self.main_frame = tk.Frame(self, width=144, height=168, padx=50)
        self.main_frame.pack(side=tk.RIGHT)
        
        #### Actions ####
        self.actions = tk.Frame(self.main_frame)
        self.actions.pack()
        self.tare_button = ttk.Button(self.actions, text="Tare", command=self.weight_reader.tare)
        self.tare_button.pack()
        
        self.canvas = tk.Canvas(self.main_frame, width=144, height=168, background='white')
        self.canvas.pack()
        
        self.label = self.canvas.create_text(50, 68, text="0.0 g", font=("Arial", 18), fill='black', justify='left')

        self.update_weight_display()

        self.focus_force()

    
    def connect(self):
        if self.weight_reader.serial is None:
            port = self.port.get()
            self.weight_reader.connect(port)
            self.connect_button.config(text="Disconnect")
            self.connection_settings.pack_forget()
        else:
            self.weight_reader.disconnect()
            self.connect_button.config(text="Connect")
            self.connect_button.pack_forget()
            self.reader_settings.pack_forget()
            self.actions.pack_forget()
            self.connection_settings.pack()
            self.connect_button.pack()
            self.reader_settings.pack()
            self.actions.pack()
    
    def update_devices(self):
        self.weight_reader.scan_devices()
        self.port.config(values=self.weight_reader.ports)
        if len(self.weight_reader.ports) > 0:
            self.port.set(self.weight_reader.ports[0])
    
    def update_calib(self):
        self.weight_reader.calib_factor = self.calib_weight.get() / float(self.calib_measurements.get())

    
    def update_weight_display(self):
        weight = self.weight_reader.value
        self.canvas.itemconfig(self.label, text=f"{weight:.1f} g")
        self.after(100, self.update_weight_display)

def main():
    weight_reader = WeightReader()
    threading.Thread(target=weight_reader.read_weights, daemon=True).start()

    app = WeightApp(weight_reader)
    app.protocol("WM_DELETE_WINDOW", lambda: on_closing(app, weight_reader))
    app.mainloop()

def on_closing(app, weight_reader):
    weight_reader.stop()
    app.destroy()

if __name__ == "__main__":
    main()