import uuid
from datetime import datetime

from sqlalchemy import String, Numeric, Integer, DateTime, ForeignKey, func
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.database import Base


class FundFlowEdge(Base):
    __tablename__ = "fund_flow_edges"

    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)
    source_node: Mapped[str] = mapped_column(String(256))
    target_node: Mapped[str] = mapped_column(String(256))
    source_type: Mapped[str] = mapped_column(String(32), default="unknown")
    target_type: Mapped[str] = mapped_column(String(32), default="unknown")
    amount: Mapped[float] = mapped_column(Numeric(14, 2), default=0)
    tx_count: Mapped[int] = mapped_column(Integer, default=1)
    earliest_time: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())