"""Pagination keyboards for reminder lists."""

from typing import List
from aiogram.types import InlineKeyboardMarkup, InlineKeyboardButton
from aiogram.filters.callback_data import CallbackData

from bot.db.models import Reminder


class PaginationCallback(CallbackData, prefix="page"):
    """Callback for pagination."""
    action: str  # prev, next, select
    page: int
    reminder_id: int = 0


def get_reminders_list_keyboard(
    reminders: List[Reminder],
    page: int = 0,
    page_size: int = 5,
) -> InlineKeyboardMarkup:
    """
    Get keyboard with paginated reminders list.

    Args:
        reminders: List of all reminders
        page: Current page number (0-indexed)
        page_size: Number of items per page

    Returns:
        InlineKeyboardMarkup with reminder buttons and navigation
    """
    total_pages = (len(reminders) + page_size - 1) // page_size
    start_idx = page * page_size
    end_idx = min(start_idx + page_size, len(reminders))

    buttons = []

    # Add buttons for reminders on current page
    for reminder in reminders[start_idx:end_idx]:
        status_icon = "✅" if reminder.is_active else "⏸"
        button_text = f"{status_icon} #{reminder.id} {reminder.text[:30]}..."

        buttons.append([
            InlineKeyboardButton(
                text=button_text,
                callback_data=PaginationCallback(
                    action="select",
                    page=page,
                    reminder_id=reminder.id
                ).pack()
            )
        ])

    # Add navigation buttons if needed
    nav_buttons = []

    if page > 0:
        nav_buttons.append(
            InlineKeyboardButton(
                text="⬅️ Назад",
                callback_data=PaginationCallback(
                    action="prev",
                    page=page - 1
                ).pack()
            )
        )

    # Page counter
    if total_pages > 1:
        nav_buttons.append(
            InlineKeyboardButton(
                text=f"{page + 1}/{total_pages}",
                callback_data="noop"
            )
        )

    if page < total_pages - 1:
        nav_buttons.append(
            InlineKeyboardButton(
                text="Далее ➡️",
                callback_data=PaginationCallback(
                    action="next",
                    page=page + 1
                ).pack()
            )
        )

    if nav_buttons:
        buttons.append(nav_buttons)

    keyboard = InlineKeyboardMarkup(inline_keyboard=buttons)
    return keyboard