# -*- coding: utf-8 -*-
"""
Диалози за съобщения, центрирани спрямо прозореца на приложението (parent),
а не спрямо физическия екран.
"""

import tkinter as tk
from tkinter import ttk


def _center_on_parent(dialog, parent):
    """Поставя диалога в центъра на parent (размер и позиция на приложението)."""
    if parent is None:
        return
    dialog.update_idletasks()
    parent.update_idletasks()
    w = dialog.winfo_reqwidth()
    h = dialog.winfo_reqheight()
    rw = parent.winfo_width()
    rh = parent.winfo_height()
    rx = parent.winfo_rootx()
    ry = parent.winfo_rooty()
    x = rx + max(0, (rw - w) // 2)
    y = ry + max(0, (rh - h) // 2)
    dialog.geometry(f"+{x}+{y}")


def _dialog(parent, title, message, dialog_type="info", ask_yes_no=False):
    """
    Показва модален диалог (Toplevel), центриран спрямо parent.
    dialog_type: "info" | "warning" | "error"
    ask_yes_no: ако True, бутони Да/Не и връща True/False.
    """
    root = parent.winfo_toplevel() if parent else tk._default_root
    d = tk.Toplevel(root)
    d.title(title)
    d.transient(parent or root)
    d.resizable(False, False)

    # рамка с отстъп
    f = ttk.Frame(d, padding=16)
    f.pack(fill=tk.BOTH, expand=True)

    # иконка + текст (опционално различни цветове за error/warning)
    msg_label = ttk.Label(f, text=message, wraplength=400, justify=tk.LEFT)
    msg_label.pack(anchor=tk.W, fill=tk.X, pady=(0, 12))

    result = [None]

    def ok():
        result[0] = True
        d.destroy()

    def no():
        result[0] = False
        d.destroy()

    btn_frame = ttk.Frame(f)
    btn_frame.pack(anchor=tk.E)
    if ask_yes_no:
        ttk.Button(btn_frame, text="Да", command=ok).pack(side=tk.LEFT, padx=4)
        ttk.Button(btn_frame, text="Не", command=no).pack(side=tk.LEFT, padx=4)
    else:
        ttk.Button(btn_frame, text="OK", command=ok).pack(side=tk.LEFT, padx=4)

    d.protocol("WM_DELETE_WINDOW", no if ask_yes_no else ok)
    if parent:
        d.after_idle(lambda: _center_on_parent(d, parent))
    d.grab_set()
    d.focus_set()
    d.wait_window()
    return result[0] if ask_yes_no else None


def showinfo(title, message, parent=None):
    _dialog(parent, title, message, "info", ask_yes_no=False)


def showwarning(title, message, parent=None):
    _dialog(parent, title, message, "warning", ask_yes_no=False)


def showerror(title, message, parent=None):
    _dialog(parent, title, message, "error", ask_yes_no=False)


def askyesno(title, message, parent=None):
    return _dialog(parent, title, message, "info", ask_yes_no=True) is True