import uuid
from datetime import datetime
from decimal import Decimal
from typing import Literal

from pydantic import BaseModel, Field

AccountType = Literal[
    "checking", "savings", "cash_isa", "stocks_shares_isa",
    "credit_card", "investment", "cash", "crypto_wallet",
    "loan", "mortgage", "pension", "other"
]


class AccountCreate(BaseModel):
    name: str = Field(..., min_length=1, max_length=100)
    institution: str | None = None
    type: AccountType
    currency: str = Field(default="GBP", min_length=3, max_length=10)
    credit_limit: Decimal | None = None
    interest_rate: Decimal | None = None
    include_in_net_worth: bool = True
    color: str = Field(default="#6366f1", pattern=r"^#[0-9a-fA-F]{6}$")
    icon: str | None = None
    notes: str | None = None
    opening_balance: Decimal = Field(default=Decimal("0"))


class AccountUpdate(BaseModel):
    name: str | None = Field(default=None, min_length=1, max_length=100)
    institution: str | None = None
    opening_balance: Decimal | None = None
    credit_limit: Decimal | None = None
    interest_rate: Decimal | None = None
    include_in_net_worth: bool | None = None
    is_active: bool | None = None
    color: str | None = Field(default=None, pattern=r"^#[0-9a-fA-F]{6}$")
    icon: str | None = None
    notes: str | None = None


class AccountResponse(BaseModel):
    id: uuid.UUID
    name: str
    institution: str | None
    type: str
    currency: str
    current_balance: Decimal
    credit_limit: Decimal | None
    interest_rate: Decimal | None
    is_active: bool
    include_in_net_worth: bool
    color: str
    icon: str | None
    notes: str | None
    created_at: datetime
    updated_at: datetime

    model_config = {"from_attributes": True}