"""Composition root + общие хелперы для CLI-команд."""
from __future__ import annotations

from decimal import Decimal

from rich.console import Console

from application.forecast import ForecastService
from application.scenarios import ScenarioService
from domain import CurrencyConverter, FinancialModel
from infrastructure.ai.assistant import AssistantService
from infrastructure.cli.paths import MODEL_PATH
from infrastructure.repositories import JsonFileRepository


console = Console()

_json_repo = JsonFileRepository()


def load_model() -> FinancialModel:
    if MODEL_PATH.exists():
        return _json_repo.load(MODEL_PATH)
    return FinancialModel()


def save_model(model: FinancialModel) -> None:
    _json_repo.save(model, MODEL_PATH)


def build_services(model: FinancialModel) -> tuple[ForecastService, ScenarioService, AssistantService, CurrencyConverter]:
    """Composition root: собрать граф сервисов с зависимостями."""
    converter = CurrencyConverter(model.exchange_rates)
    forecast_service = ForecastService(model)
    scenario_service = ScenarioService(model)
    assistant_service = AssistantService(
        model, forecast_service=forecast_service, converter=converter
    )
    return forecast_service, scenario_service, assistant_service, converter


def resolve_currency(model: FinancialModel, currency: str | None) -> tuple[str, str]:
    target = currency or model.base_currency
    converter = CurrencyConverter(model.exchange_rates)
    symbol = converter.get_symbol(target)
    return target, symbol


def convert_value(
    converter: CurrencyConverter, amount: Decimal, from_curr: str, to_curr: str
) -> Decimal:
    if to_curr == from_curr:
        return amount
    return converter.convert(amount, from_curr, to_curr)


def fmt_amount(amount: Decimal | float, currency: str, symbol: str) -> str:
    if isinstance(amount, Decimal):
        return f"{symbol}{amount:,.2f}"
    return f"{symbol}{amount:,.2f}"