import uuid
from datetime import datetime

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

from app.core.database import Base

import enum


class CaseStatus(str, enum.Enum):
    pending = "pending"
    uploading = "uploading"
    analyzing = "analyzing"
    reviewing = "reviewing"
    completed = "completed"


class Case(Base):
    __tablename__ = "cases"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    case_no: Mapped[str] = mapped_column(String(64), unique=True, index=True)
    title: Mapped[str] = mapped_column(String(256))
    victim_name: Mapped[str] = mapped_column(String(128))
    handler: Mapped[str] = mapped_column(String(128), default="")
    status: Mapped[CaseStatus] = mapped_column(SAEnum(CaseStatus), default=CaseStatus.pending)
    image_count: Mapped[int] = mapped_column(Integer, default=0)
    total_amount: Mapped[float] = mapped_column(Numeric(14, 2), default=0)
    created_by: Mapped[str] = mapped_column(String(128), default="")
    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())
    deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

    images = relationship("EvidenceImage", back_populates="case", lazy="selectin")
    transactions = relationship("TransactionRecord", back_populates="case", lazy="selectin")
    assessments = relationship("FraudAssessment", back_populates="case", lazy="selectin")
    reports = relationship("ExportReport", back_populates="case", lazy="selectin")