from __future__ import annotations

from dataclasses import dataclass
from decimal import Decimal
from typing import Protocol

from app.models.portfolio import PortfolioConfig
from app.services.boundary_values import boundary_decimal


class _SaveStatusConfig(Protocol):
    entry_basis_mode: str
    gold_value: float | None
    entry_price: float | None
    gold_ounces: float | None
    current_ltv: float
    margin_call_price: object


@dataclass(frozen=True, slots=True)
class SaveStatusSnapshot:
    entry_basis_mode: str
    gold_value: Decimal
    entry_price: Decimal
    gold_ounces: Decimal
    current_ltv: Decimal
    margin_call_price: Decimal


def _normalize_save_status_snapshot(config: PortfolioConfig | _SaveStatusConfig) -> SaveStatusSnapshot:
    margin_call_price = config.margin_call_price
    resolved_margin_call_price = margin_call_price() if callable(margin_call_price) else margin_call_price
    return SaveStatusSnapshot(
        entry_basis_mode=config.entry_basis_mode,
        gold_value=boundary_decimal(config.gold_value, field_name="config.gold_value"),
        entry_price=boundary_decimal(config.entry_price, field_name="config.entry_price"),
        gold_ounces=boundary_decimal(config.gold_ounces, field_name="config.gold_ounces"),
        current_ltv=boundary_decimal(config.current_ltv, field_name="config.current_ltv"),
        margin_call_price=boundary_decimal(
            resolved_margin_call_price,
            field_name="config.margin_call_price",
        ),
    )


def margin_call_price_value(config: PortfolioConfig | _SaveStatusConfig) -> float:
    return float(_normalize_save_status_snapshot(config).margin_call_price)


def save_status_text(config: PortfolioConfig | _SaveStatusConfig) -> str:
    snapshot = _normalize_save_status_snapshot(config)
    return (
        f"Saved: basis={snapshot.entry_basis_mode}, start=${float(snapshot.gold_value):,.0f}, "
        f"entry=${float(snapshot.entry_price):,.2f}/oz, weight={float(snapshot.gold_ounces):,.2f} oz, "
        f"LTV={float(snapshot.current_ltv):.1%}, trigger=${float(snapshot.margin_call_price):,.2f}/oz"
    )