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 cli.i18n import setup_i18n, t
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

setup_i18n()

app = typer.Typer(name="cf", help=t("app.help"))
console = Console()

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

CURRENCY_OPTION = typer.Option(None, "--currency", "-c", help=t("cmd.forecast.opt.currency"))


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(t("cmd.init.ok", path=str(MODEL_PATH)))


@app.command()
def forecast(
    months: int = typer.Option(12, "--months", "-m", help=t("cmd.forecast.opt.months")),
    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=t("cmd.forecast.title", months=months, currency=target_curr))
        table.add_column(t("cmd.forecast.col.account"), style="cyan")
        table.add_column(t("cmd.forecast.col.month"), style="white")
        table.add_column(t("cmd.forecast.col.balance"), justify="right", style="green")
        table.add_column(t("cmd.forecast.col.income"), justify="right")
        table.add_column(t("cmd.forecast.col.expenses"), 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(t("cmd.forecast.total", balance=_f(cb), income=_f(ci), expenses=_f(ce)))


@app.command()
def scenario(
    name: str = typer.Argument("baseline", help=t("cmd.scenario.arg.name")),
    months: int = typer.Option(12, "--months", "-m", help=t("cmd.scenario.opt.months")),
    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]{t('cmd.scenario.err.unknown', name=name)}[/red]")
        console.print(t("cmd.scenario.err.available", scenarios=", ".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]{t('cmd.scenario.label')}:[/bold] {result['scenario']}")
    console.print(f"[dim]{result['scenario_description']}[/dim]")
    console.print(f"{t('cmd.scenario.label.balance')}: {_fmt(balance, target_curr, symbol)}")
    console.print(f"{t('cmd.scenario.label.income')}: {_fmt(income, target_curr, symbol)}")
    console.print(f"{t('cmd.scenario.label.expenses')}: {_fmt(expenses, target_curr, symbol)}")


@app.command()
def whatif(
    income_mult: float = typer.Option(1.0, "--income", "-i", help=t("cmd.whatif.opt.income")),
    expense_mult: float = typer.Option(1.0, "--expense", "-e", help=t("cmd.whatif.opt.expense")),
    growth_mult: float = typer.Option(1.0, "--growth", "-g", help=t("cmd.whatif.opt.growth")),
    months: int = typer.Option(12, "--months", "-m", help=t("cmd.whatif.opt.months")),
    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(f"[bold]{t('cmd.whatif.title')}[/bold]")
    console.print(t("cmd.whatif.params", income=income_mult, expense=expense_mult, growth=growth_mult))
    console.print(f"{t('cmd.scenario.label.balance')}: {_fmt(balance, target_curr, symbol)}")
    console.print(f"{t('cmd.scenario.label.income')}: {_fmt(income, target_curr, symbol)}")
    console.print(f"{t('cmd.scenario.label.expenses')}: {_fmt(expenses, target_curr, symbol)}")


@app.command()
def compare(
    months: int = typer.Option(12, "--months", "-m", help=t("cmd.compare.opt.months")),
    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=t("cmd.compare.title", currency=target_curr))
    table.add_column(t("cmd.compare.col.scenario"), style="cyan")
    table.add_column(t("cmd.forecast.col.balance"), justify="right")
    table.add_column(t("cmd.forecast.col.income"), justify="right")
    table.add_column(t("cmd.forecast.col.expenses"), 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=t("cmd.import.arg.path")),
) -> None:
    """Импорт данных из Excel"""
    sync = ExcelSync()
    try:
        model = sync.import_model(path)
        _save_model(model)
        console.print(t("cmd.import.ok",
                         accounts=len(model.accounts),
                         transactions=len(model.transactions),
                         recurring=len(model.recurring),
                         assets=len(model.assets),
                         liabilities=len(model.liabilities)))
        console.print(t("cmd.import.base_currency", currency=model.base_currency))
    except Exception as e:
        console.print(f"[red]{t('cmd.import.err', error=str(e))}[/red]")
        raise typer.Exit(1)


@app.command()
def export_xlsx(
    path: str = typer.Argument("exports/forecast.xlsx", help=t("cmd.export.arg.path")),
) -> None:
    """Экспорт модели в Excel"""
    model = _load_model()
    sync = ExcelSync()
    try:
        sync.export_model(model, path)
        console.print(t("cmd.export.ok", path=path))
    except Exception as e:
        console.print(f"[red]{t('cmd.export.err', error=str(e))}[/red]")
        raise typer.Exit(1)


@app.command()
def analyze(
    months: int = typer.Option(12, "--months", "-m", help=t("cmd.analyze.opt.months")),
    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(f"[bold]{t('cmd.analyze.title.prompt')}:[/bold]")
    console.print(result["prompt"][:500] + "...\n")

    console.print(f"[bold]{t('cmd.analyze.title.summary')}:[/bold]")
    console.print(t("cmd.analyze.base_currency", currency=model.base_currency))
    console.print(f"\n[yellow]{t('cmd.analyze.stub')}[/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(f"[bold]{t('cmd.info.metadata')}[/bold]")
    console.print(f"  {t('cmd.info.base_currency', currency=model.base_currency, symbol=symbol)}")
    console.print(f"  {t('cmd.info.accounts', count=len(model.accounts))}")
    console.print(f"  {t('cmd.info.transactions', count=len(model.transactions))}")
    console.print(f"  {t('cmd.info.recurring', count=len(model.recurring))}")
    console.print(f"  {t('cmd.info.assets', count=len(model.assets))}")
    console.print(f"  {t('cmd.info.liabilities', count=len(model.liabilities))}")
    console.print(f"  {t('cmd.info.rates', count=len(model.exchange_rates))}")

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

    if model.transactions:
        tbl = Table(title=t("table.transactions.title"))
        tbl.add_column(t("table.transactions.col.date"))
        tbl.add_column(t("table.transactions.col.category"))
        tbl.add_column(t("table.transactions.col.amount"), justify="right")
        tbl.add_column(t("table.transactions.col.description"))
        for tx in model.transactions[:10]:
            tbl.add_row(tx.date, tx.category, f"{tx.amount:,.2f}", tx.description)
        if len(model.transactions) > 10:
            console.print(tbl)
            console.print(t("cmd.info.more", count=len(model.transactions) - 10))
        else:
            console.print(tbl)

    if model.recurring:
        tbl = Table(title=t("table.recurring.title"))
        tbl.add_column(t("table.recurring.col.period"))
        tbl.add_column(t("table.recurring.col.amount"), justify="right")
        tbl.add_column(t("table.recurring.col.category"))
        for r in model.recurring:
            tbl.add_row(r.frequency, f"{r.amount:,.2f}", r.category)
        console.print(tbl)

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

    if model.liabilities:
        tbl = Table(title=t("table.liabilities.title"))
        tbl.add_column(t("table.liabilities.col.name"), style="cyan")
        tbl.add_column(t("table.liabilities.col.balance"), justify="right")
        tbl.add_column(t("table.liabilities.col.rate"), justify="right")
        tbl.add_column(t("table.liabilities.col.payment"), justify="right")
        for li in model.liabilities:
            tbl.add_row(li.name, f"{li.balance:,.2f}", f"{li.interest:.1f}%", f"{li.payment:,.2f}")
        console.print(tbl)


app.add_typer(config_app)

if __name__ == "__main__":
    app()