"""Schemata für Konten."""

from datetime import date, datetime
from decimal import Decimal

from pydantic import Field

from app.models.enums import AccountType
from app.schemas.common import ApiModel, HexColor, InputModel, Money


class AccountBase(InputModel):
    name: str = Field(min_length=1, max_length=120, examples=["Girokonto"])
    type: AccountType = AccountType.CHECKING
    iban_last4: str | None = Field(
        default=None, pattern=r"^\d{4}$", description="Letzte vier Stellen der IBAN."
    )
    opening_balance: Money = Field(
        default=Decimal("0.00"), description="Saldo zum Stichtag `opening_balance_date`."
    )
    opening_balance_date: date
    color: HexColor = "#3b82f6"
    icon: str = Field(default="wallet", max_length=64, description="Name eines lucide-Icons.")
    is_active: bool = True
    sort_order: int = 0


class AccountCreate(AccountBase):
    pass


class AccountUpdate(InputModel):
    """Alle Felder optional – gesetzt wird nur, was mitgeschickt wurde."""

    name: str | None = Field(default=None, min_length=1, max_length=120)
    type: AccountType | None = None
    iban_last4: str | None = Field(default=None, pattern=r"^\d{4}$")
    opening_balance: Money | None = None
    opening_balance_date: date | None = None
    color: HexColor | None = None
    icon: str | None = Field(default=None, max_length=64)
    is_active: bool | None = None
    sort_order: int | None = None


class AccountOut(ApiModel):
    id: int
    name: str
    type: AccountType
    iban_last4: str | None
    opening_balance: Money
    opening_balance_date: date
    color: str
    icon: str
    is_active: bool
    sort_order: int
    created_at: datetime
    updated_at: datetime


class AccountBalanceOut(ApiModel):
    """Fortgeschriebener Saldo zu einem Stichtag."""

    account_id: int
    as_of: date
    opening_balance: Money
    booked_transactions: Money = Field(description="Summe der einmaligen Buchungen.")
    booked_occurrences: Money = Field(description="Summe der bestätigten Fälligkeiten.")
    balance: Money = Field(description="Eröffnungssaldo zuzüglich aller Bewegungen.")