import sys
from pathlib import Path

import typer
from rich.console import Console
from rich.table import Table

from ai.assistant import AssistantService
from cashflow_model import CurrencyConverter, FinancialModel
from cli.config import app as config_app
from engine.forecast import ForecastService
from engine.scenarios import DEFAULT_SCENARIOS, ScenarioService
from sync.excel_sync import ExcelSync

try:
    sys.stdout.reconfigure(encoding="utf-8")
except (AttributeError, OSError):
    pass

app = typer.Typer(name="cf", help="CashFlow Forecast - personal finance model")
console = Console()

DATA_DIR = Path("data")
MODEL_PATH = DATA_DIR / "model.json"

CURRENCY_HELP = "Валюта отображения (по умолчанию — базовая валюта модели)"
CURRENCY_OPTION = typer.Option(None, "--currency", "-c", help=CURRENCY_HELP)


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


def _save_model(model: FinancialModel) -> None:
    model.save(MODEL_PATH)


def _get_converter(model: FinancialModel) -> CurrencyConverter:
    return CurrencyConverter(model.exchange_rates)


def _fmt(amount: float, currency: str, symbol: str) -> str:
    return f"{symbol}{amount:,.2f}"


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


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


@app.command()
def init() -> None:
    """Создать пустую финансовую модель"""
    model = FinancialModel()
    _save_model(model)
    console.print(f"[green]OK[/green] Пустая модель создана в {MODEL_PATH}")


@app.command()
def forecast(
    months: int = typer.Option(12, "--months", "-m", help="Количество месяцев прогноза"),
    currency: str | None = CURRENCY_OPTION,
) -> None:
    """Запустить прогноз денежных потоков"""
    model = _load_model()
    target_curr, symbol = _resolve_currency(model, currency)
    converter = _get_converter(model)
    base_curr = model.base_currency
    service = ForecastService(model)
    results = service.forecast_cashflow(months)
    summary = service.summary(months)

    def _cv(val):
        return _convert_value(converter, val, base_curr, target_curr)

    def _f(val):
        return _fmt(val, target_curr, symbol)

    if results:
        table = Table(title=f"Прогноз на {months} мес. ({target_curr})")
        table.add_column("Счёт", style="cyan")
        table.add_column("Месяц", style="white")
        table.add_column("Баланс", justify="right", style="green")
        table.add_column("Доход", justify="right")
        table.add_column("Расход", justify="right")

        for r in results:
            table.add_row(
                r["account"], str(r["month"]),
                _f(_cv(r["balance"])),
                _f(_cv(r["income"])),
                _f(_cv(r["expenses"])),
            )
        console.print(table)

    cb = _cv(summary["total_balance"])
    ci = _cv(summary["total_income"])
    ce = _cv(summary["total_expenses"])
    console.print(f"\n[bold]Итог:[/bold] Баланс: {_f(cb)} | Доход: {_f(ci)} | Расход: {_f(ce)}")


@app.command()
def scenario(
    name: str = typer.Argument("baseline", help="Имя сценария: baseline, optimistic, pessimistic"),
    months: int = typer.Option(12, "--months", "-m", help="Количество месяцев"),
    currency: str | None = CURRENCY_OPTION,
) -> None:
    """Применить сценарий и показать прогноз"""
    model = _load_model()
    target_curr, symbol = _resolve_currency(model, currency)
    converter = _get_converter(model)
    base_curr = model.base_currency
    service = ScenarioService(model)

    if name in DEFAULT_SCENARIOS:
        scenario_obj = DEFAULT_SCENARIOS[name]
    else:
        console.print(f"[red]Неизвестный сценарий: {name}[/red]")
        console.print(f"Доступны: {', '.join(DEFAULT_SCENARIOS.keys())}")
        raise typer.Exit(1)

    result = service.apply(scenario_obj, months)
    balance = _convert_value(converter, result["total_balance"], base_curr, target_curr)
    income = _convert_value(converter, result["total_income"], base_curr, target_curr)
    expenses = _convert_value(converter, result["total_expenses"], base_curr, target_curr)
    console.print(f"[bold]Сценарий:[/bold] {result['scenario']}")
    console.print(f"[dim]{result['scenario_description']}[/dim]")
    console.print(f"Баланс: {_fmt(balance, target_curr, symbol)}")
    console.print(f"Доход: {_fmt(income, target_curr, symbol)}")
    console.print(f"Расход: {_fmt(expenses, target_curr, symbol)}")


@app.command()
def whatif(
    income_mult: float = typer.Option(1.0, "--income", "-i", help="Множитель дохода"),
    expense_mult: float = typer.Option(1.0, "--expense", "-e", help="Множитель расхода"),
    growth_mult: float = typer.Option(1.0, "--growth", "-g", help="Множитель роста активов"),
    months: int = typer.Option(12, "--months", "-m", help="Количество месяцев"),
    currency: str | None = CURRENCY_OPTION,
) -> None:
    """What-if анализ с произвольными множителями"""
    model = _load_model()
    target_curr, symbol = _resolve_currency(model, currency)
    converter = _get_converter(model)
    base_curr = model.base_currency
    service = ScenarioService(model)
    result = service.what_if(income_mult, expense_mult, growth_mult, months)

    balance = _convert_value(converter, result["total_balance"], base_curr, target_curr)
    income = _convert_value(converter, result["total_income"], base_curr, target_curr)
    expenses = _convert_value(converter, result["total_expenses"], base_curr, target_curr)
    console.print("[bold]What-if анализ[/bold]")
    console.print(f"Доход x{income_mult} | Расход x{expense_mult} | Рост x{growth_mult}")
    console.print(f"Баланс: {_fmt(balance, target_curr, symbol)}")
    console.print(f"Доход: {_fmt(income, target_curr, symbol)}")
    console.print(f"Расход: {_fmt(expenses, target_curr, symbol)}")


@app.command()
def compare(
    months: int = typer.Option(12, "--months", "-m", help="Количество месяцев"),
    currency: str | None = CURRENCY_OPTION,
) -> None:
    """Сравнить все сценарии"""
    model = _load_model()
    target_curr, symbol = _resolve_currency(model, currency)
    converter = _get_converter(model)
    base_curr = model.base_currency
    service = ScenarioService(model)
    results = service.compare(months)

    table = Table(title=f"Сравнение сценариев ({target_curr})")
    table.add_column("Сценарий", style="cyan")
    table.add_column("Баланс", justify="right")
    table.add_column("Доход", justify="right")
    table.add_column("Расход", justify="right")

    for name, r in results.items():
        b = _convert_value(converter, r["total_balance"], base_curr, target_curr)
        i = _convert_value(converter, r["total_income"], base_curr, target_curr)
        e = _convert_value(converter, r["total_expenses"], base_curr, target_curr)
        fb = _fmt(b, target_curr, symbol)
        fi = _fmt(i, target_curr, symbol)
        fe = _fmt(e, target_curr, symbol)
        table.add_row(name, fb, fi, fe)
    console.print(table)


@app.command()
def import_xlsx(
    path: str = typer.Argument(..., help="Путь к .xlsx файлу"),
) -> None:
    """Импорт данных из Excel"""
    sync = ExcelSync()
    try:
        model = sync.import_model(path)
        _save_model(model)
        console.print(f"[green]OK[/green] Импортировано: {len(model.accounts)} счетов, "
                      f"{len(model.transactions)} транзакций, "
                      f"{len(model.recurring)} регулярных платежей, "
                      f"{len(model.assets)} активов, "
                      f"{len(model.liabilities)} обязательств")
        console.print(f"[dim]Базовая валюта: {model.base_currency}[/dim]")
    except Exception as e:
        console.print(f"[red]Ошибка импорта: {e}[/red]")
        raise typer.Exit(1)


@app.command()
def export_xlsx(
    path: str = typer.Argument("exports/forecast.xlsx", help="Путь для .xlsx файла"),
) -> None:
    """Экспорт модели в Excel"""
    model = _load_model()
    sync = ExcelSync()
    try:
        sync.export_model(model, path)
        console.print(f"[green]OK[/green] Модель экспортирована в {path}")
    except Exception as e:
        console.print(f"[red]Ошибка экспорта: {e}[/red]")
        raise typer.Exit(1)


@app.command()
def analyze(
    months: int = typer.Option(12, "--months", "-m", help="Количество месяцев для анализа"),
    currency: str | None = CURRENCY_OPTION,
) -> None:
    """AI-анализ финансовой модели"""
    model = _load_model()
    target_curr, _ = _resolve_currency(model, currency)
    converter = _get_converter(model)
    assistant = AssistantService(model, converter=converter, display_currency=target_curr)
    result = assistant.analyze(months)

    console.print("[bold]Промпт для AI:[/bold]")
    console.print(result["prompt"][:500] + "...\n")

    console.print("[bold]Сводка:[/bold]")
    console.print(f"Базовая валюта: {model.base_currency}")
    console.print(
        "\n[yellow]AI-ответ: заглушка. Подключите реальный API в ai/assistant.py[/yellow]"
    )


@app.command()
def info() -> None:
    """Сводка всей финансовой модели"""
    model = _load_model()
    converter = _get_converter(model)
    symbol = converter.get_symbol(model.base_currency)

    console.print("[bold]Метаданные[/bold]")
    console.print(f"  Базовая валюта: {model.base_currency} ({symbol})")
    console.print(f"  Счетов: {len(model.accounts)}")
    console.print(f"  Транзакций: {len(model.transactions)}")
    console.print(f"  Регулярных платежей: {len(model.recurring)}")
    console.print(f"  Активов: {len(model.assets)}")
    console.print(f"  Обязательств: {len(model.liabilities)}")
    console.print(f"  Курсов валют: {len(model.exchange_rates)}")

    if model.accounts:
        t = Table(title="Счета")
        t.add_column("Название", style="cyan")
        t.add_column("Валюта")
        t.add_column("Баланс", justify="right")
        for a in model.accounts:
            t.add_row(a.name, a.currency, f"{a.balance:,.2f}")
        console.print(t)

    if model.transactions:
        t = Table(title="Транзакции")
        t.add_column("Дата")
        t.add_column("Категория")
        t.add_column("Сумма", justify="right")
        t.add_column("Описание")
        for tx in model.transactions[:10]:
            t.add_row(tx.date, tx.category, f"{tx.amount:,.2f}", tx.description)
        if len(model.transactions) > 10:
            console.print(t)
            console.print(f"[dim]... и ещё {len(model.transactions) - 10} транзакций[/dim]")
        else:
            console.print(t)

    if model.recurring:
        t = Table(title="Регулярные платежи")
        t.add_column("Период")
        t.add_column("Сумма", justify="right")
        t.add_column("Категория")
        for r in model.recurring:
            t.add_row(r.frequency, f"{r.amount:,.2f}", r.category)
        console.print(t)

    if model.assets:
        t = Table(title="Активы")
        t.add_column("Название", style="cyan")
        t.add_column("Стоимость", justify="right")
        t.add_column("Рост", justify="right")
        for a in model.assets:
            t.add_row(a.name, f"{a.value:,.2f}", f"{a.growth_rate:.1f}%")
        console.print(t)

    if model.liabilities:
        t = Table(title="Обязательства")
        t.add_column("Название", style="cyan")
        t.add_column("Долг", justify="right")
        t.add_column("Ставка", justify="right")
        t.add_column("Платёж", justify="right")
        for li in model.liabilities:
            t.add_row(li.name, f"{li.balance:,.2f}", f"{li.interest:.1f}%", f"{li.payment:,.2f}")
        console.print(t)


app.add_typer(config_app)

if __name__ == "__main__":
    app()