from datetime import datetime
from decimal import Decimal

from sqlalchemy import (
    JSON,
    Boolean,
    DateTime,
    ForeignKey,
    Integer,
    Numeric,
    String,
    UniqueConstraint,
    func,
)
from sqlalchemy.orm import Mapped, mapped_column

from app.db.base import Base


class Achievement(Base):
    __tablename__ = "achievements"

    id: Mapped[int] = mapped_column(primary_key=True)
    code: Mapped[str] = mapped_column(String(80), unique=True, index=True)
    scope: Mapped[str] = mapped_column(String(24), default="user", server_default="user", index=True)
    title: Mapped[str] = mapped_column(String(120))
    description: Mapped[str] = mapped_column(String(260))
    icon: Mapped[str | None] = mapped_column(String(40))
    category: Mapped[str | None] = mapped_column(String(40), index=True)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, server_default="true", index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())


class UserAchievement(Base):
    __tablename__ = "user_achievements"
    __table_args__ = (
        UniqueConstraint(
            "user_id",
            "achievement_id",
            "vehicle_id",
            "service_center_id",
            name="uq_user_achievement_scope",
        ),
    )

    id: Mapped[int] = mapped_column(primary_key=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), index=True)
    achievement_id: Mapped[int] = mapped_column(ForeignKey("achievements.id", ondelete="CASCADE"), index=True)
    vehicle_id: Mapped[int | None] = mapped_column(ForeignKey("cars.id", ondelete="CASCADE"), index=True)
    service_center_id: Mapped[int | None] = mapped_column(ForeignKey("service_centers.id", ondelete="CASCADE"), index=True)
    unlocked_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), index=True)
    metadata_json: Mapped[dict | None] = mapped_column(JSON)


class VehicleScore(Base):
    __tablename__ = "vehicle_scores"

    id: Mapped[int] = mapped_column(primary_key=True)
    vehicle_id: Mapped[int] = mapped_column(ForeignKey("cars.id", ondelete="CASCADE"), unique=True, index=True)
    completeness_score: Mapped[int] = mapped_column(Integer, default=0, server_default="0")
    verified_history_score: Mapped[int] = mapped_column(Integer, default=0, server_default="0")
    maintenance_health_score: Mapped[int] = mapped_column(Integer, default=100, server_default="100")
    maintenance_status: Mapped[str] = mapped_column(String(24), default="unknown", server_default="unknown", index=True)
    profile_quality: Mapped[str] = mapped_column(String(40), default="basic", server_default="basic", index=True)
    verified_history_status: Mapped[str] = mapped_column(String(40), default="self_reported", server_default="self_reported", index=True)
    missing_items: Mapped[list | None] = mapped_column(JSON)
    computed_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())


class ServiceCenterScore(Base):
    __tablename__ = "service_center_scores"

    id: Mapped[int] = mapped_column(primary_key=True)
    service_center_id: Mapped[int] = mapped_column(
        ForeignKey("service_centers.id", ondelete="CASCADE"), unique=True, index=True
    )
    trust_score: Mapped[int] = mapped_column(Integer, default=0, server_default="0")
    trust_level: Mapped[str] = mapped_column(String(40), default="new_service", server_default="new_service", index=True)
    confirmed_visits_count: Mapped[int] = mapped_column(Integer, default=0, server_default="0")
    confirmation_rate: Mapped[Decimal] = mapped_column(Numeric(5, 2), default=0, server_default="0")
    dispute_rate: Mapped[Decimal] = mapped_column(Numeric(5, 2), default=0, server_default="0")
    computed_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())


class EngagementEvent(Base):
    __tablename__ = "engagement_events"

    id: Mapped[int] = mapped_column(primary_key=True)
    user_id: Mapped[int | None] = mapped_column(ForeignKey("users.id", ondelete="SET NULL"), index=True)
    vehicle_id: Mapped[int | None] = mapped_column(ForeignKey("cars.id", ondelete="CASCADE"), index=True)
    service_center_id: Mapped[int | None] = mapped_column(ForeignKey("service_centers.id", ondelete="CASCADE"), index=True)
    event_type: Mapped[str] = mapped_column(String(80), index=True)
    metadata_json: Mapped[dict | None] = mapped_column(JSON)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), index=True)