"""Pydantic schemas for sale-related request and response bodies."""

import uuid
from datetime import date, datetime
from decimal import Decimal
from typing import Literal, Optional

from pydantic import BaseModel, ConfigDict, Field


SALE_STATUSES = Literal["draft", "completed", "cancelled"]


class SaleCreate(BaseModel):
    """POST /api/v1/sales request body."""

    vehicle_id: uuid.UUID
    buyer_contact_id: uuid.UUID
    seller_contact_id: Optional[uuid.UUID] = None
    sale_price: Decimal = Field(..., ge=0)
    sale_date: Optional[date] = None
    status: SALE_STATUSES = "draft"
    is_gwg: bool = False


class SaleUpdate(BaseModel):
    """PUT /api/v1/sales/:id request body (all fields optional)."""

    sale_price: Optional[Decimal] = Field(None, ge=0)
    sale_date: Optional[date] = None
    status: Optional[SALE_STATUSES] = None
    is_gwg: Optional[bool] = None
    seller_contact_id: Optional[uuid.UUID] = None


class VehicleNested(BaseModel):
    """Nested vehicle info in sale response."""

    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID
    make: str
    model: str
    fin: str
    vehicle_type: str
    availability: str
    price: Decimal


class ContactNested(BaseModel):
    """Nested contact info in sale response."""

    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID
    company_name: str
    address_city: Optional[str] = None
    address_country: str
    vat_id: Optional[str] = None
    email: Optional[str] = None
    phone: Optional[str] = None


class SaleResponse(BaseModel):
    """Sale response schema with nested vehicle and contacts."""

    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID
    vehicle_id: uuid.UUID
    buyer_contact_id: uuid.UUID
    seller_contact_id: Optional[uuid.UUID] = None
    sale_price: Decimal
    sale_date: date
    status: str
    is_gwg: bool
    contract_pdf_path: Optional[str] = None
    created_at: Optional[datetime] = None
    updated_at: Optional[datetime] = None
    vehicle: Optional[VehicleNested] = None
    buyer: Optional[ContactNested] = None
    seller: Optional[ContactNested] = None


class SaleListResponse(BaseModel):
    """Paginated sale list response."""

    items: list[SaleResponse]
    total: int
    page: int
    page_size: int


class ContractResponse(BaseModel):
    """Response for contract PDF generation/download."""

    sale_id: uuid.UUID
    contract_pdf_path: str
    message: str = "Contract generated"


class UstIdVerifyResponse(BaseModel):
    """Response for USt-IdNr. verification."""

    verified: bool
    message: str
    vat_id: Optional[str] = None