"""User-facing prints: flavor list, cost warnings (no invented ₽)."""

from __future__ import annotations

from collections.abc import Callable
from typing import Any

from gpu_rent.config import Config
from gpu_rent.inventory import FlavorInfo, looks_like_gpu, rank_flavors, resolve_flavor

Log = Callable[[str], None]


def list_ranked_flavors(flavors: list[Any], cfg: Config) -> list[FlavorInfo]:
    gpu = [f for f in flavors if looks_like_gpu(f)]
    return rank_flavors(gpu or flavors, cfg.flavor_preference)


def format_flavor_lines(ranked: list[FlavorInfo], picked: FlavorInfo | None = None) -> list[str]:
    if not ranked:
        return ["flavors: пусто (проверь регион / FLAVOR_PREFERENCE)"]
    lines = ["flavors (по FLAVOR_PREFERENCE):"]
    for i, info in enumerate(ranked, 1):
        mark = " ← выберем" if picked and info.id == picked.id else ""
        ram = f"{info.ram_mb // 1024}GB" if info.ram_mb else "?"
        vcpu = str(info.vcpus) if info.vcpus is not None else "?"
        label = info.label or "—"
        lines.append(f"  {i}. [{label}] {info.name}  vCPU={vcpu} RAM={ram}  id={info.id}{mark}")
    return lines


def cost_and_risk_lines(cfg: Config, *, spot: bool, flavor_name: str) -> list[str]:
    """Honest billing notes — OpenStack has no ₽ prices."""
    return [
        f"план: {'preemptible ' if spot else ''}{flavor_name}, data {cfg.data_volume_size_gb} GB",
        "₽: цены в OpenStack API нет — смотри панель Selectel (GPU ₽/час + диск ₽/мес).",
        "диск data тарифицируется 24/7, даже когда GPU выключен (stop).",
        f"idle-killer: {cfg.idle_grace_minutes} мин льготы после boot, потом "
        f"{cfg.idle_minutes} мин пустой очереди → delete compute. Отложить: gpu-rent hold",
        "preemptible: хостер может усыпить (~24 ч окно) → EXPIRED; tunnel сам unshelve, "
        "или gpu-rent up",
        "Ctrl+C на tunnel GPU не гасит — только gpu-rent stop или idle-killer. "
        "Опционально: gpu-rent watchdog install — аварийное закрытие окна/ребут "
        "после grace тоже stop (Ctrl+C по-прежнему detach)",
    ]


def print_up_preview(
    cfg: Config,
    flavors: list[Any],
    *,
    picked: FlavorInfo,
    spot: bool,
    log: Log,
) -> None:
    ranked = list_ranked_flavors(flavors, cfg)
    for line in format_flavor_lines(ranked, picked):
        log(line)
    log("")
    for line in cost_and_risk_lines(cfg, spot=spot, flavor_name=picked.name):
        log(f"! {line}")


def resolve_and_preview(
    cfg: Config,
    flavors: list[Any],
    *,
    explicit: str | None,
    spot: bool,
    log: Log,
) -> FlavorInfo:
    picked = resolve_flavor(
        flavors,
        cfg.flavor_preference,
        explicit=explicit,
        default_id=cfg.default_flavor_id or None,
        fallback=cfg.flavor_fallback,
    )
    print_up_preview(cfg, flavors, picked=picked, spot=spot, log=log)
    return picked