"""Pydantic schemas for vehicle-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, field_validator, model_validator


VEHICLE_TYPES = Literal["lkw", "pkw", "baumaschine", "stapler", "transporter"]
CONDITIONS = Literal["new", "used"]
AVAILABILITY = Literal["available", "reserved", "sold"]
HOURS_UNITS = Literal["h", "min"]


class VehicleBase(BaseModel):
    """Base vehicle fields shared across schemas."""

    make: str = Field(..., min_length=1, max_length=100)
    model: str = Field(..., min_length=1, max_length=100)
    fin: str = Field(..., min_length=17, max_length=17)
    year: Optional[int] = Field(None, ge=1900, le=2100)
    first_registration: Optional[date] = None
    power_kw: Optional[int] = Field(None, ge=0)
    power_hp: Optional[int] = Field(None, ge=0)
    fuel_type: Optional[str] = Field(None, max_length=50)
    transmission: Optional[str] = Field(None, max_length=20)
    color: Optional[str] = Field(None, max_length=50)
    condition: CONDITIONS = "used"
    location: Optional[str] = Field(None, max_length=255)
    availability: AVAILABILITY = "available"
    price: Decimal = Field(..., ge=0)
    vehicle_type: VEHICLE_TYPES
    lkw_type: Optional[str] = Field(None, max_length=50)
    machine_type: Optional[str] = Field(None, max_length=50)
    body_type: Optional[str] = Field(None, max_length=100)
    operating_hours: Optional[Decimal] = Field(None, ge=0)
    operating_hours_unit: Optional[HOURS_UNITS] = None
    mileage_km: Optional[int] = Field(None, ge=0)
    description: Optional[str] = None

    @model_validator(mode="after")
    def compute_power_hp(self) -> "VehicleBase":
        """Auto-compute power_hp from power_kw if not provided."""
        if self.power_kw is not None and self.power_hp is None:
            self.power_hp = round(self.power_kw * 1.35962)
        return self


class VehicleCreate(VehicleBase):
    """POST /api/v1/vehicles request body."""
    pass


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

    make: Optional[str] = Field(None, min_length=1, max_length=100)
    model: Optional[str] = Field(None, min_length=1, max_length=100)
    fin: Optional[str] = Field(None, min_length=17, max_length=17)
    year: Optional[int] = Field(None, ge=1900, le=2100)
    first_registration: Optional[date] = None
    power_kw: Optional[int] = Field(None, ge=0)
    power_hp: Optional[int] = Field(None, ge=0)
    fuel_type: Optional[str] = Field(None, max_length=50)
    transmission: Optional[str] = Field(None, max_length=20)
    color: Optional[str] = Field(None, max_length=50)
    condition: Optional[CONDITIONS] = None
    location: Optional[str] = Field(None, max_length=255)
    availability: Optional[AVAILABILITY] = None
    price: Optional[Decimal] = Field(None, ge=0)
    vehicle_type: Optional[VEHICLE_TYPES] = None
    lkw_type: Optional[str] = Field(None, max_length=50)
    machine_type: Optional[str] = Field(None, max_length=50)
    body_type: Optional[str] = Field(None, max_length=100)
    operating_hours: Optional[Decimal] = Field(None, ge=0)
    operating_hours_unit: Optional[HOURS_UNITS] = None
    mileage_km: Optional[int] = Field(None, ge=0)
    description: Optional[str] = None

    @model_validator(mode="after")
    def compute_power_hp(self) -> "VehicleUpdate":
        """Auto-compute power_hp from power_kw if not provided."""
        if self.power_kw is not None and self.power_hp is None:
            self.power_hp = round(self.power_kw * 1.35962)
        return self


class VehicleResponse(BaseModel):
    """Vehicle response schema."""

    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID
    make: str
    model: str
    fin: str
    year: Optional[int] = None
    first_registration: Optional[date] = None
    power_kw: Optional[int] = None
    power_hp: Optional[int] = None
    fuel_type: Optional[str] = None
    transmission: Optional[str] = None
    color: Optional[str] = None
    condition: str
    location: Optional[str] = None
    availability: str
    price: Decimal
    vehicle_type: str
    lkw_type: Optional[str] = None
    machine_type: Optional[str] = None
    body_type: Optional[str] = None
    operating_hours: Optional[Decimal] = None
    operating_hours_unit: Optional[str] = None
    mileage_km: Optional[int] = None
    description: Optional[str] = None
    created_at: Optional[datetime] = None
    updated_at: Optional[datetime] = None
    deleted_at: Optional[datetime] = None


class VehicleListResponse(BaseModel):
    """Paginated vehicle list response."""

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


class MobileDeStatusResponse(BaseModel):
    """mobile.de sync status for a vehicle."""

    synced: bool
    ad_id: Optional[str] = None
    synced_at: Optional[datetime] = None
    sync_status: str = "pending"
    error_log: Optional[str] = None


class MobileDePushResponse(BaseModel):
    """Response for mobile.de push request."""

    message: str = "Push queued"
    vehicle_id: uuid.UUID
    listing_id: Optional[uuid.UUID] = None