from datetime import date, datetime
from decimal import Decimal

from sqlalchemy import Date, DateTime, ForeignKey, Integer, Numeric, String, Text, UniqueConstraint, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db.base import Base


class Car(Base):
    __tablename__ = "cars"

    id: Mapped[int] = mapped_column(primary_key=True)
    owner_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), index=True)
    name: Mapped[str] = mapped_column(String(160))
    make: Mapped[str | None] = mapped_column(String(80))
    model: Mapped[str | None] = mapped_column(String(80))
    trim: Mapped[str | None] = mapped_column(String(120))
    year: Mapped[int | None]
    plate_number: Mapped[str | None] = mapped_column(String(32))
    vin: Mapped[str | None] = mapped_column(String(32))
    fuel_type: Mapped[str | None] = mapped_column(String(32))
    target_consumption_l_per_100km: Mapped[Decimal | None] = mapped_column(Numeric(6, 2))
    fuel_tank_volume_l: Mapped[Decimal | None] = mapped_column(Numeric(6, 2))
    engine_oil_type: Mapped[str | None] = mapped_column(String(80))
    engine_oil_volume_l: Mapped[Decimal | None] = mapped_column(Numeric(5, 2))
    transmission_fluid_type: Mapped[str | None] = mapped_column(String(80))
    transmission_fluid_volume_l: Mapped[Decimal | None] = mapped_column(Numeric(5, 2))
    coolant_type: Mapped[str | None] = mapped_column(String(80))
    brake_fluid_type: Mapped[str | None] = mapped_column(String(80))
    tire_pressure_front_bar: Mapped[Decimal | None] = mapped_column(Numeric(4, 2))
    tire_pressure_rear_bar: Mapped[Decimal | None] = mapped_column(Numeric(4, 2))
    purchase_date: Mapped[date | None] = mapped_column(Date)
    purchase_price: Mapped[Decimal | None] = mapped_column(Numeric(12, 2))
    current_odometer: Mapped[int | None]
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )

    owner = relationship("User", back_populates="cars")
    fuel_entries = relationship("FuelEntry", back_populates="car", cascade="all, delete-orphan")
    service_entries = relationship("ServiceEntry", back_populates="car", cascade="all, delete-orphan")
    service_links = relationship("CarServiceLink", back_populates="car", cascade="all, delete-orphan")


class CarMake(Base):
    __tablename__ = "car_makes"

    id: Mapped[int] = mapped_column(primary_key=True)
    name: Mapped[str] = mapped_column(String(80), unique=True, index=True)
    country: Mapped[str | None] = mapped_column(String(80))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    models = relationship("CarModel", back_populates="make", cascade="all, delete-orphan")


class CarModel(Base):
    __tablename__ = "car_models"
    __table_args__ = (UniqueConstraint("make_id", "name", name="uq_car_models_make_name"),)

    id: Mapped[int] = mapped_column(primary_key=True)
    make_id: Mapped[int] = mapped_column(ForeignKey("car_makes.id", ondelete="CASCADE"), index=True)
    name: Mapped[str] = mapped_column(String(100), index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    make = relationship("CarMake", back_populates="models")
    trims = relationship("CarTrim", back_populates="model", cascade="all, delete-orphan")


class CarTrim(Base):
    __tablename__ = "car_trims"
    __table_args__ = (UniqueConstraint("model_id", "name", name="uq_car_trims_model_name"),)

    id: Mapped[int] = mapped_column(primary_key=True)
    model_id: Mapped[int] = mapped_column(ForeignKey("car_models.id", ondelete="CASCADE"), index=True)
    name: Mapped[str] = mapped_column(String(120), index=True)
    body_type: Mapped[str | None] = mapped_column(String(60))
    fuel_type: Mapped[str | None] = mapped_column(String(32))
    transmission: Mapped[str | None] = mapped_column(String(32))
    drive_type: Mapped[str | None] = mapped_column(String(32))
    year_from: Mapped[int | None] = mapped_column(Integer)
    year_to: Mapped[int | None] = mapped_column(Integer)
    market: Mapped[str | None] = mapped_column(String(80))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    model = relationship("CarModel", back_populates="trims")


class ServiceCenter(Base):
    __tablename__ = "service_centers"

    id: Mapped[int] = mapped_column(primary_key=True)
    name: Mapped[str] = mapped_column(String(160), unique=True, index=True)
    telegram_chat_id: Mapped[str | None] = mapped_column(String(80), unique=True, index=True)
    contact_phone: Mapped[str | None] = mapped_column(String(40))
    address: Mapped[str | None] = mapped_column(String(240))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    car_links = relationship("CarServiceLink", back_populates="service_center", cascade="all, delete-orphan")
    inbox_messages = relationship("ServiceInboxMessage", back_populates="service_center")


class CarServiceLink(Base):
    __tablename__ = "car_service_links"
    __table_args__ = (UniqueConstraint("car_id", "service_center_id", name="uq_car_service_link"),)

    id: Mapped[int] = mapped_column(primary_key=True)
    car_id: Mapped[int] = mapped_column(ForeignKey("cars.id", ondelete="CASCADE"), index=True)
    service_center_id: Mapped[int] = mapped_column(ForeignKey("service_centers.id", ondelete="CASCADE"), index=True)
    external_vehicle_ref: Mapped[str | None] = mapped_column(String(120), index=True)
    is_active: Mapped[bool] = mapped_column(default=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    car = relationship("Car", back_populates="service_links")
    service_center = relationship("ServiceCenter", back_populates="car_links")


class ServiceInboxMessage(Base):
    __tablename__ = "service_inbox_messages"

    id: Mapped[int] = mapped_column(primary_key=True)
    service_center_id: Mapped[int | None] = mapped_column(ForeignKey("service_centers.id", ondelete="SET NULL"), index=True)
    car_id: Mapped[int | None] = mapped_column(ForeignKey("cars.id", ondelete="SET NULL"), index=True)
    source_chat_id: Mapped[str | None] = mapped_column(String(80), index=True)
    raw_text: Mapped[str] = mapped_column(Text)
    parsed_status: Mapped[str] = mapped_column(String(32), default="pending", index=True)
    parsed_payload: Mapped[str | None] = mapped_column(Text)
    error: Mapped[str | None] = mapped_column(Text)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    service_center = relationship("ServiceCenter", back_populates="inbox_messages")