# target_simulator/gui/settings_window.py

"""
A Toplevel window for configuring application settings, like serial connection.
"""

import tkinter as tk
from tkinter import ttk, messagebox

from core.serial_communicator import SerialCommunicator


class SettingsWindow(tk.Toplevel):
    """
    A dialog window for connection settings.
    """

    def __init__(self, master, communicator: SerialCommunicator):
        super().__init__(master)
        self.master_view = master
        self.communicator = communicator
        
        # --- Window Configuration ---
        self.title("Connection Settings")
        self.transient(master) # Keep this window on top of the main one
        self.grab_set()        # Modal: block interaction with the main window
        self.resizable(False, False)
        
        self.selected_port = tk.StringVar()

        # --- UI Creation ---
        main_frame = ttk.Frame(self, padding="10")
        main_frame.pack(fill=tk.BOTH, expand=True)

        ttk.Label(main_frame, text="Select Serial Port:").grid(row=0, column=0, sticky=tk.W, pady=5)
        
        self.port_combobox = ttk.Combobox(main_frame, textvariable=self.selected_port, state="readonly")
        self.port_combobox.grid(row=0, column=1, padx=5, sticky=tk.EW)
        
        self._populate_ports()

        # --- Buttons ---
        button_frame = ttk.Frame(main_frame)
        button_frame.grid(row=2, column=0, columnspan=2, pady=10)

        ttk.Button(button_frame, text="Test Connection", command=self._on_test_connection).pack(side=tk.LEFT, padx=5)
        ttk.Button(button_frame, text="Save", command=self._on_save).pack(side=tk.LEFT, padx=5)
        ttk.Button(button_frame, text="Cancel", command=self.destroy).pack(side=tk.LEFT, padx=5)
        
        # Center the window
        self.update_idletasks()
        x = master.winfo_x() + (master.winfo_width() // 2) - (self.winfo_width() // 2)
        y = master.winfo_y() + (master.winfo_height() // 2) - (self.winfo_height() // 2)
        self.geometry(f"+{x}+{y}")
        
    def _populate_ports(self):
        """Fetches and displays available serial ports."""
        available_ports = self.communicator.list_available_ports()
        if available_ports:
            self.port_combobox['values'] = available_ports
            self.selected_port.set(available_ports[0])
        else:
            self.port_combobox['values'] = ['No ports found']
            self.selected_port.set('No ports found')

    def _on_test_connection(self):
        """Tests the connection to the selected port."""
        port = self.selected_port.get()
        if not port or "No ports" in port:
            messagebox.showerror("Error", "No serial port selected.", parent=self)
            return

        if self.communicator.connect(port):
            messagebox.showinfo("Success", f"Successfully connected to {port}.", parent=self)
            self.communicator.disconnect()
        else:
            messagebox.showerror("Failure", f"Failed to connect to {port}.", parent=self)

    def _on_save(self):
        """Saves the selected settings and closes the window."""
        port_to_save = self.selected_port.get()
        if not port_to_save or "No ports" in port_to_save:
             messagebox.showerror("Error", "Cannot save, no valid port selected.", parent=self)
             return
        
        # Call back to the main view to update its configuration
        self.master_view.update_connection_settings(port_to_save)
        self.destroy()