"""Pydantic-Schemas für Anfragen/Antworten (Phase 0: Auth, Benutzer, Einstellungen)."""

from datetime import date as date_t, datetime, time as time_t

from pydantic import BaseModel, ConfigDict, Field, field_validator

from .models import (
    AccountType,
    BudgetTreatment,
    CategoryKind,
    IdentifierKind,
    Role,
    TxnType,
)

ALLOWED_CURRENCIES = {"EUR", "CHF"}


def _check_currency(v: str) -> str:
    v = v.upper()
    if v not in ALLOWED_CURRENCIES:
        raise ValueError("Währung muss EUR oder CHF sein")
    return v


class UserOut(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: int
    username: str
    role: Role
    display_name: str | None = None
    is_active: bool
    must_change_password: bool
    created_at: datetime


class UserCreate(BaseModel):
    username: str = Field(min_length=1, max_length=64)
    password: str = Field(min_length=1, max_length=1024)
    role: Role = Role.user
    display_name: str | None = Field(default=None, max_length=120)


class UserUpdate(BaseModel):
    password: str | None = Field(default=None, min_length=1, max_length=1024)
    role: Role | None = None
    display_name: str | None = Field(default=None, max_length=120)
    is_active: bool | None = None


class PasswordChange(BaseModel):
    current_password: str = Field(min_length=1, max_length=1024)
    new_password: str = Field(min_length=1, max_length=1024)


class SettingOut(BaseModel):
    key: str
    value: str | None = None


# --- Konten ----------------------------------------------------------------


class AccountIdentifierIn(BaseModel):
    kind: IdentifierKind = IdentifierKind.iban
    value: str = Field(min_length=1, max_length=64)


class AccountIdentifierOut(BaseModel):
    id: int
    kind: IdentifierKind
    value: str


class AccountCreate(BaseModel):
    name: str = Field(min_length=1, max_length=120)
    type: AccountType = AccountType.girokonto
    currency: str = "EUR"
    icon: str = "wallet"
    color: str = "#3f51b5"
    opening_balance_cents: int = 0
    opening_date: date_t | None = None
    identifiers: list[AccountIdentifierIn] = Field(default_factory=list)

    @field_validator("currency")
    @classmethod
    def _cur(cls, v: str) -> str:
        return _check_currency(v)


class AccountUpdate(BaseModel):
    name: str | None = Field(default=None, min_length=1, max_length=120)
    type: AccountType | None = None
    currency: str | None = None
    icon: str | None = None
    color: str | None = None
    opening_balance_cents: int | None = None
    opening_date: date_t | None = None
    is_archived: bool | None = None
    position: int | None = None
    # Wenn gesetzt, ersetzt die komplette Identifikator-Liste.
    identifiers: list[AccountIdentifierIn] | None = None

    @field_validator("currency")
    @classmethod
    def _cur(cls, v: str | None) -> str | None:
        return _check_currency(v) if v is not None else None


class AccountOut(BaseModel):
    id: int
    name: str
    type: AccountType
    currency: str
    icon: str
    color: str
    opening_balance_cents: int
    opening_date: date_t | None
    is_archived: bool
    position: int
    identifiers: list[AccountIdentifierOut]
    balance_cents: int
    balance_base_cents: int


# --- Kategorien ------------------------------------------------------------


class CategoryOut(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: int
    group_id: int
    name: str
    type: CategoryKind
    icon: str
    color: str
    position: int
    is_builtin: bool
    is_archived: bool


class CategoryGroupOut(BaseModel):
    id: int
    name: str
    kind: CategoryKind
    icon: str
    color: str
    position: int
    is_builtin: bool
    categories: list[CategoryOut]


class CategoryGroupCreate(BaseModel):
    name: str = Field(min_length=1, max_length=120)
    kind: CategoryKind = CategoryKind.expense
    icon: str = "list"
    color: str = "#6b7480"


class CategoryGroupUpdate(BaseModel):
    name: str | None = Field(default=None, min_length=1, max_length=120)
    icon: str | None = None
    color: str | None = None
    position: int | None = None


class CategoryCreate(BaseModel):
    group_id: int
    name: str = Field(min_length=1, max_length=120)
    icon: str = "more-horizontal"
    color: str = "#6b7480"


class CategoryUpdate(BaseModel):
    name: str | None = Field(default=None, min_length=1, max_length=120)
    group_id: int | None = None
    icon: str | None = None
    color: str | None = None
    position: int | None = None
    is_archived: bool | None = None


# --- Transaktionen ---------------------------------------------------------


class TransactionCreate(BaseModel):
    type: TxnType
    date: date_t
    time: time_t | None = None
    account_id: int
    to_account_id: int | None = None
    amount_cents: int = Field(gt=0)
    to_amount_cents: int | None = Field(default=None, gt=0)
    fx_rate: float | None = Field(default=None, gt=0)
    category_id: int | None = None
    budget_treatment: BudgetTreatment | None = None
    budget_category_id: int | None = None
    payee: str | None = Field(default=None, max_length=255)
    description: str | None = Field(default=None, max_length=255)
    notes: str | None = None


class TransactionUpdate(BaseModel):
    type: TxnType | None = None
    date: date_t | None = None
    time: time_t | None = None
    account_id: int | None = None
    to_account_id: int | None = None
    amount_cents: int | None = Field(default=None, gt=0)
    to_amount_cents: int | None = Field(default=None, gt=0)
    fx_rate: float | None = Field(default=None, gt=0)
    category_id: int | None = None
    budget_treatment: BudgetTreatment | None = None
    budget_category_id: int | None = None
    payee: str | None = Field(default=None, max_length=255)
    description: str | None = Field(default=None, max_length=255)
    notes: str | None = None


class TransactionOut(BaseModel):
    id: int
    type: TxnType
    date: date_t
    time: time_t | None
    account_id: int
    to_account_id: int | None
    account_currency: str
    amount_cents: int
    to_amount_cents: int | None
    fx_rate: float | None
    amount_eur_cents: int
    amount_base_cents: int
    category_id: int | None
    budget_treatment: BudgetTreatment | None
    budget_category_id: int | None
    payee: str | None
    description: str | None
    notes: str | None


class RateStatus(BaseModel):
    currency: str
    count: int
    min_date: date_t | None
    max_date: date_t | None
    latest_rate: float | None


class ConversionOut(BaseModel):
    amount_cents: int
    from_currency: str
    to_currency: str
    date: date_t
    converted_cents: int | None
    rate: float | None