"""SQLAlchemy models for vehicles and mobile.de listings."""

import enum
import uuid
from datetime import date, datetime
from decimal import Decimal
from typing import TYPE_CHECKING

from sqlalchemy import (
    CheckConstraint,
    Date,
    DateTime,
    ForeignKey,
    Integer,
    Numeric,
    String,
    Text,
    func,
)
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database import Base

if TYPE_CHECKING:
    from app.models.file import File


class VehicleCondition(str, enum.Enum):
    new = "new"
    used = "used"


class VehicleAvailability(str, enum.Enum):
    available = "available"
    reserved = "reserved"
    sold = "sold"


class VehicleType(str, enum.Enum):
    lkw = "lkw"
    pkw = "pkw"
    baumaschine = "baumaschine"
    stapler = "stapler"
    transporter = "transporter"


class SyncStatus(str, enum.Enum):
    pending = "pending"
    synced = "synced"
    fehler = "fehler"


class Vehicle(Base):
    """Vehicle entity for the ERP inventory."""

    __tablename__ = "vehicles"
    __table_args__ = (
        CheckConstraint("char_length(fin) = 17", name="ck_vehicles_fin_length"),
        CheckConstraint("condition IN ('new', 'used')", name="ck_vehicles_condition"),
        CheckConstraint(
            "availability IN ('available', 'reserved', 'sold')",
            name="ck_vehicles_availability",
        ),
        CheckConstraint(
            "vehicle_type IN ('lkw', 'pkw', 'baumaschine', 'stapler', 'transporter')",
            name="ck_vehicles_vehicle_type",
        ),
        CheckConstraint(
            "operating_hours_unit IS NULL OR operating_hours_unit IN ('h', 'min')",
            name="ck_vehicles_operating_hours_unit",
        ),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
    )
    make: Mapped[str] = mapped_column(String(100), nullable=False)
    model: Mapped[str] = mapped_column(String(100), nullable=False)
    fin: Mapped[str] = mapped_column(
        String(17), unique=True, nullable=False, index=True
    )
    year: Mapped[int | None] = mapped_column(Integer, nullable=True)
    first_registration: Mapped[date | None] = mapped_column(Date, nullable=True)
    power_kw: Mapped[int | None] = mapped_column(Integer, nullable=True)
    power_hp: Mapped[int | None] = mapped_column(Integer, nullable=True)
    fuel_type: Mapped[str | None] = mapped_column(String(50), nullable=True)
    transmission: Mapped[str | None] = mapped_column(String(20), nullable=True)
    color: Mapped[str | None] = mapped_column(String(50), nullable=True)
    condition: Mapped[str] = mapped_column(String(20), nullable=False, default="used")
    location: Mapped[str | None] = mapped_column(String(255), nullable=True)
    availability: Mapped[str] = mapped_column(
        String(20), nullable=False, default="available"
    )
    price: Mapped[Decimal] = mapped_column(Numeric(12, 2), nullable=False)
    vehicle_type: Mapped[str] = mapped_column(String(20), nullable=False)
    lkw_type: Mapped[str | None] = mapped_column(String(50), nullable=True)
    machine_type: Mapped[str | None] = mapped_column(String(50), nullable=True)
    body_type: Mapped[str | None] = mapped_column(String(100), nullable=True)
    operating_hours: Mapped[Decimal | None] = mapped_column(
        Numeric(12, 1), nullable=True
    )
    operating_hours_unit: Mapped[str | None] = mapped_column(String(5), nullable=True)
    mileage_km: Mapped[int | None] = mapped_column(Integer, nullable=True)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
        server_default=func.now(),
        onupdate=func.now(),
    )
    deleted_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )

    mobile_de_listings: Mapped[list["MobileDeListing"]] = relationship(
        back_populates="vehicle", cascade="all, delete-orphan"
    )
    files: Mapped[list["File"]] = relationship(
        "File", back_populates="vehicle", cascade="all, delete-orphan"
    )

    def __repr__(self) -> str:
        return f"<Vehicle id={self.id} fin={self.fin} make={self.make}>"

    def to_dict(self) -> dict:
        """Serialize vehicle for API responses."""
        return {
            "id": str(self.id),
            "make": self.make,
            "model": self.model,
            "fin": self.fin,
            "year": self.year,
            "first_registration": (
                self.first_registration.isoformat() if self.first_registration else None
            ),
            "power_kw": self.power_kw,
            "power_hp": self.power_hp,
            "fuel_type": self.fuel_type,
            "transmission": self.transmission,
            "color": self.color,
            "condition": self.condition,
            "location": self.location,
            "availability": self.availability,
            "price": float(self.price) if self.price is not None else None,
            "vehicle_type": self.vehicle_type,
            "lkw_type": self.lkw_type,
            "machine_type": self.machine_type,
            "body_type": self.body_type,
            "operating_hours": (
                float(self.operating_hours)
                if self.operating_hours is not None
                else None
            ),
            "operating_hours_unit": self.operating_hours_unit,
            "mileage_km": self.mileage_km,
            "description": self.description,
            "created_at": (self.created_at.isoformat() if self.created_at else None),
            "updated_at": (self.updated_at.isoformat() if self.updated_at else None),
            "deleted_at": (self.deleted_at.isoformat() if self.deleted_at else None),
        }


class MobileDeListing(Base):
    """mobile.de listing sync tracking for a vehicle."""

    __tablename__ = "mobile_de_listings"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
    )
    vehicle_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("vehicles.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    ad_id: Mapped[str | None] = mapped_column(String(100), nullable=True)
    sync_status: Mapped[str] = mapped_column(
        String(20), nullable=False, default="pending"
    )
    synced_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )
    error_log: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
        server_default=func.now(),
        onupdate=func.now(),
    )

    vehicle: Mapped["Vehicle"] = relationship(back_populates="mobile_de_listings")

    def __repr__(self) -> str:
        return f"<MobileDeListing id={self.id} vehicle_id={self.vehicle_id} status={self.sync_status}>"

    def to_dict(self) -> dict:
        """Serialize listing for API responses."""
        return {
            "id": str(self.id),
            "vehicle_id": str(self.vehicle_id),
            "ad_id": self.ad_id,
            "sync_status": self.sync_status,
            "synced_at": (self.synced_at.isoformat() if self.synced_at else None),
            "error_log": self.error_log,
            "created_at": (self.created_at.isoformat() if self.created_at else None),
            "updated_at": (self.updated_at.isoformat() if self.updated_at else None),
        }