"""Numbered interactive menus (Enter = default index)."""

from __future__ import annotations

from collections.abc import Callable, Sequence
from dataclasses import dataclass

from rich.markup import escape

Ask = Callable[[str, str], str]
Show = Callable[[str], None]


@dataclass(frozen=True)
class MenuItem:
    key: str
    label: str


def resolve_menu_choice(
    raw: str,
    items: Sequence[MenuItem],
    *,
    default_key: str,
) -> str:
    """Accept 1-based index or exact key (case-insensitive). Empty → default."""
    text = (raw or "").strip().lower()
    if not text:
        return default_key
    if text.isdigit():
        idx = int(text)
        if 1 <= idx <= len(items):
            return items[idx - 1].key
        raise ValueError(f"выбор: жду 1…{len(items)}, получили {idx}")
    for item in items:
        if item.key.lower() == text:
            return item.key
    keys = ", ".join(f"{i}:{it.key}" for i, it in enumerate(items, 1))
    raise ValueError(f"выбор: жду номер или ключ ({keys}), получили {raw!r}")


def prompt_menu(
    title: str,
    items: Sequence[MenuItem],
    *,
    default: str,
    ask: Ask,
    show: Show | None = None,
) -> str:
    """Print numbered list, ask for index (default = current recommendation)."""
    if not items:
        raise ValueError(f"{title}: пустое меню")
    default_idx = 1
    for i, item in enumerate(items, 1):
        if item.key == default:
            default_idx = i
            break
    safe_title = escape(title)
    lines = [f"[bold cyan]{safe_title}[/bold cyan]"]
    for i, item in enumerate(items, 1):
        label = escape(item.label)
        if i == default_idx:
            lines.append(f"  [cyan]{i}.[/cyan] {label} [green]←[/green]")
        else:
            lines.append(f"  [dim]{i}.[/dim] {label}")
    emit = show
    if emit is None:
        from gpu_rent.term import log as emit  # type: ignore[assignment]
    for line in lines:
        emit(line)
    raw = ask(f"{title} [1-{len(items)}]", str(default_idx))
    return resolve_menu_choice(raw, items, default_key=items[default_idx - 1].key)