import uuid
from datetime import datetime
import enum

from sqlalchemy import String, Numeric, Text, DateTime, ForeignKey, Enum as SAEnum, func
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.core.database import Base


class ConfidenceLevel(str, enum.Enum):
    high = "high"
    medium = "medium"
    low = "low"


class ReviewStatus(str, enum.Enum):
    pending = "pending"
    confirmed = "confirmed"
    rejected = "rejected"
    needs_info = "needs_info"


class FraudAssessment(Base):
    __tablename__ = "fraud_assessments"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    case_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("cases.id"), index=True)
    transaction_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("transaction_records.id"))
    confidence_level: Mapped[ConfidenceLevel] = mapped_column(SAEnum(ConfidenceLevel))
    assessed_amount: Mapped[float] = mapped_column(Numeric(14, 2), default=0)
    reason: Mapped[str] = mapped_column(Text, default="")
    exclude_reason: Mapped[str] = mapped_column(Text, default="")
    review_status: Mapped[ReviewStatus] = mapped_column(SAEnum(ReviewStatus), default=ReviewStatus.pending)
    review_note: Mapped[str] = mapped_column(Text, default="")
    reviewed_by: Mapped[str] = mapped_column(String(128), default="")
    reviewed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    case = relationship("Case", back_populates="assessments")
    transaction = relationship("TransactionRecord")