import uuid
from datetime import datetime
import enum

from sqlalchemy import (
    String, Numeric, Float, Boolean, DateTime, Text,
    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
from app.models.evidence_image import SourceApp


class Direction(str, enum.Enum):
    in_ = "in"
    out = "out"


class TransactionRecord(Base):
    __tablename__ = "transaction_records"

    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)
    evidence_image_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("evidence_images.id"), nullable=True)
    cluster_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("transaction_clusters.id"), nullable=True)
    source_app: Mapped[SourceApp] = mapped_column(SAEnum(SourceApp), default=SourceApp.other)
    trade_time: Mapped[datetime] = mapped_column(DateTime(timezone=True), index=True)
    amount: Mapped[float] = mapped_column(Numeric(14, 2), default=0)
    direction: Mapped[Direction] = mapped_column(SAEnum(Direction))
    counterparty_name: Mapped[str] = mapped_column(String(256), default="")
    counterparty_account: Mapped[str] = mapped_column(String(256), default="")
    self_account_tail_no: Mapped[str] = mapped_column(String(32), default="")
    order_no: Mapped[str] = mapped_column(String(128), default="", index=True)
    remark: Mapped[str] = mapped_column(Text, default="")
    confidence: Mapped[float] = mapped_column(Float, default=0.0)
    is_duplicate: Mapped[bool] = mapped_column(Boolean, default=False)
    is_transit: Mapped[bool] = mapped_column(Boolean, default=False)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    case = relationship("Case", back_populates="transactions")
    cluster = relationship("TransactionCluster", back_populates="transactions", foreign_keys=[cluster_id])