"""
Connection dialog for connecting to a live Sedona device.

Modal Toplevel with host, port, username, password fields.
Connect runs in a background thread; progress and errors shown inline.
"""

import configparser
import threading
import tkinter as tk
from tkinter import ttk

import app_state


class ConnectDialog:
    """Modal dialog for entering device connection parameters."""

    def __init__(self, parent, on_connect_callback):
        self._callback = on_connect_callback
        self._thread = None
        self._cancelled = False

        self._dlg = tk.Toplevel(parent)
        self._dlg.title("Connect to Device")
        self._dlg.resizable(False, False)
        self._dlg.transient(parent)
        self._dlg.grab_set()

        host, port, user = _load_last_connection()

        frame = ttk.Frame(self._dlg, padding=16)
        frame.pack(fill=tk.BOTH, expand=True)

        row = 0
        ttk.Label(frame, text="Host:").grid(row=row, column=0, sticky="e", padx=(0, 8), pady=4)
        self._host_var = tk.StringVar(value=host)
        self._host_entry = ttk.Entry(frame, textvariable=self._host_var, width=28)
        self._host_entry.grid(row=row, column=1, columnspan=2, sticky="ew", pady=4)

        row += 1
        ttk.Label(frame, text="Port:").grid(row=row, column=0, sticky="e", padx=(0, 8), pady=4)
        self._port_var = tk.StringVar(value=port)
        ttk.Entry(frame, textvariable=self._port_var, width=8).grid(
            row=row, column=1, sticky="w", pady=4)

        row += 1
        ttk.Label(frame, text="Username:").grid(row=row, column=0, sticky="e", padx=(0, 8), pady=4)
        self._user_var = tk.StringVar(value=user)
        ttk.Entry(frame, textvariable=self._user_var, width=28).grid(
            row=row, column=1, columnspan=2, sticky="ew", pady=4)

        row += 1
        ttk.Label(frame, text="Password:").grid(row=row, column=0, sticky="e", padx=(0, 8), pady=4)
        self._pass_var = tk.StringVar()
        ttk.Entry(frame, textvariable=self._pass_var, width=28, show="*").grid(
            row=row, column=1, columnspan=2, sticky="ew", pady=4)

        row += 1
        self._status_label = ttk.Label(frame, text="", foreground="#666666")
        self._status_label.grid(row=row, column=0, columnspan=3, sticky="w", pady=(8, 4))

        row += 1
        btn_frame = ttk.Frame(frame)
        btn_frame.grid(row=row, column=0, columnspan=3, sticky="e", pady=(8, 0))

        self._btn_connect = ttk.Button(btn_frame, text="Connect", command=self._do_connect)
        self._btn_connect.pack(side=tk.RIGHT, padx=(8, 0))

        self._btn_cancel = ttk.Button(btn_frame, text="Cancel", command=self._do_cancel)
        self._btn_cancel.pack(side=tk.RIGHT)

        self._host_entry.focus_set()
        self._dlg.bind("<Return>", lambda e: self._do_connect())
        self._dlg.bind("<Escape>", lambda e: self._do_cancel())

        self._dlg.update_idletasks()
        x = parent.winfo_x() + (parent.winfo_width() - self._dlg.winfo_width()) // 2
        y = parent.winfo_y() + (parent.winfo_height() - self._dlg.winfo_height()) // 2
        self._dlg.geometry(f"+{x}+{y}")

    def _do_connect(self):
        host = self._host_var.get().strip()
        port = self._port_var.get().strip()
        user = self._user_var.get().strip()
        password = self._pass_var.get()

        if not host:
            self._status_label.config(text="Host is required", foreground="#c00000")
            return

        try:
            port_int = int(port)
        except ValueError:
            self._status_label.config(text="Invalid port number", foreground="#c00000")
            return

        self._btn_connect.config(state="disabled")
        self._status_label.config(text="Connecting...", foreground="#666666")

        self._cancelled = False
        self._thread = threading.Thread(
            target=self._connect_worker,
            args=(host, port_int, user, password),
            daemon=True
        )
        self._thread.start()
        self._poll_connect()

    def _connect_worker(self, host, port, user, password):
        try:
            result = self._callback(host, port, user, password)
            self._result = ("ok", result, host, port, user)
        except Exception as e:
            self._result = ("error", str(e), host, port, user)

    def _poll_connect(self):
        if self._cancelled:
            return
        if self._thread is not None and self._thread.is_alive():
            self._dlg.after(100, self._poll_connect)
            return

        status, *rest = self._result
        if status == "ok":
            _, host, port, user = rest
            _save_last_connection(host, str(port), user)
            self._dlg.destroy()
        else:
            msg = rest[0]
            self._status_label.config(text=f"Error: {msg}", foreground="#c00000")
            self._btn_connect.config(state="normal")

    def _do_cancel(self):
        self._cancelled = True
        self._dlg.destroy()


def _load_last_connection():
    """Reads last connection params from editor.properties."""
    config = configparser.ConfigParser()
    host = "192.168.1.100"
    port = "1876"
    user = "admin"
    try:
        if app_state.PROPERTIES_FILE:
            config.read(app_state.PROPERTIES_FILE)
            host = config.get("Device", "host", fallback=host)
            port = config.get("Device", "port", fallback=port)
            user = config.get("Device", "user", fallback=user)
    except Exception:
        pass
    return host, port, user


def _save_last_connection(host, port, user):
    """Saves connection params to editor.properties."""
    config = configparser.ConfigParser()
    try:
        config.read(app_state.PROPERTIES_FILE)
        if "Device" not in config:
            config["Device"] = {}
        config["Device"]["host"] = host
        config["Device"]["port"] = port
        config["Device"]["user"] = user
        with open(app_state.PROPERTIES_FILE, "w") as f:
            config.write(f)
    except Exception:
        pass