import uuid
from datetime import date, datetime
from decimal import Decimal

from sqlalchemy import Boolean, Date, DateTime, ForeignKey, LargeBinary, Numeric, String, Text
from sqlalchemy.dialects.postgresql import ARRAY, JSONB, UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db.base import Base


class Transaction(Base):
    __tablename__ = "transactions"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    account_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("accounts.id"), nullable=False, index=True)
    transfer_account_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("accounts.id"), nullable=True)
    category_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("categories.id"), nullable=True, index=True)
    type: Mapped[str] = mapped_column(String(20), nullable=False)    # income|expense|transfer|investment
    status: Mapped[str] = mapped_column(String(20), default="cleared", nullable=False)
    amount: Mapped[Decimal] = mapped_column(Numeric(20, 8), nullable=False)
    amount_base: Mapped[Decimal | None] = mapped_column(Numeric(20, 8), nullable=True)
    currency: Mapped[str] = mapped_column(String(10), nullable=False)
    base_currency: Mapped[str] = mapped_column(String(10), nullable=False)
    exchange_rate: Mapped[Decimal | None] = mapped_column(Numeric(20, 10), nullable=True)
    date: Mapped[date] = mapped_column(Date, nullable=False, index=True)
    description_enc: Mapped[bytes] = mapped_column("description", LargeBinary, nullable=False)
    merchant_enc: Mapped[bytes | None] = mapped_column("merchant", LargeBinary, nullable=True)
    notes_enc: Mapped[bytes | None] = mapped_column("notes", LargeBinary, nullable=True)
    tags: Mapped[list[str]] = mapped_column(ARRAY(Text), default=list, nullable=False)
    is_recurring: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    recurring_rule: Mapped[dict | None] = mapped_column(JSONB, nullable=True)
    attachment_refs: Mapped[list] = mapped_column(JSONB, default=list, nullable=False)
    import_hash: Mapped[str | None] = mapped_column(Text, nullable=True, index=True)
    meta: Mapped[dict] = mapped_column(JSONB, default=dict, nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

    account: Mapped["Account"] = relationship(foreign_keys=[account_id], back_populates="transactions", lazy="noload")  # type: ignore[name-defined]
    category: Mapped["Category | None"] = relationship(lazy="noload")  # type: ignore[name-defined]