from __future__ import annotations

from datetime import datetime, timezone

from sqlalchemy import DateTime, Float, ForeignKey, Integer, String, Text, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column

from app.core.db.common import CommonBase


class AccountingSalesIncomeTransaction(CommonBase):
    __tablename__ = "accounting_sales_income_transactions"
    __table_args__ = (
        UniqueConstraint(
            "tenant_id",
            "client_id",
            "fingerprint",
            name="uq_accounting_sales_income_fingerprint",
        ),
    )

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    tenant_id: Mapped[int] = mapped_column(
        ForeignKey("tenants.id", ondelete="CASCADE"), nullable=False, index=True
    )
    client_id: Mapped[int] = mapped_column(
        ForeignKey("clients.id", ondelete="CASCADE"), nullable=False, index=True
    )

    source_type: Mapped[str] = mapped_column(String(30), nullable=False, default="outward_import", index=True)
    source_file_name: Mapped[str] = mapped_column(String(255), nullable=False, default="")
    fingerprint: Mapped[str] = mapped_column(String(80), nullable=False, index=True)

    return_period: Mapped[str] = mapped_column(String(20), nullable=False, default="", index=True)
    document_type: Mapped[str] = mapped_column(String(40), nullable=False, default="Invoice", index=True)
    invoice_number: Mapped[str] = mapped_column(String(120), nullable=False, default="", index=True)
    invoice_date: Mapped[str] = mapped_column(String(20), nullable=False, default="", index=True)

    customer_name: Mapped[str] = mapped_column(String(255), nullable=False, default="", index=True)
    customer_gstin: Mapped[str] = mapped_column(String(20), nullable=False, default="", index=True)
    place_of_supply: Mapped[str] = mapped_column(String(120), nullable=False, default="")
    supply_type: Mapped[str] = mapped_column(String(60), nullable=False, default="")
    export_type: Mapped[str] = mapped_column(String(60), nullable=False, default="")

    hsn_code: Mapped[str] = mapped_column(String(20), nullable=False, default="", index=True)
    description_text: Mapped[str] = mapped_column(Text, nullable=False, default="")

    taxable_value: Mapped[float] = mapped_column(Float, nullable=False, default=0)
    cgst: Mapped[float] = mapped_column(Float, nullable=False, default=0)
    sgst: Mapped[float] = mapped_column(Float, nullable=False, default=0)
    igst: Mapped[float] = mapped_column(Float, nullable=False, default=0)
    cess: Mapped[float] = mapped_column(Float, nullable=False, default=0)
    invoice_value: Mapped[float] = mapped_column(Float, nullable=False, default=0)

    suggested_nature_id: Mapped[int | None] = mapped_column(
        ForeignKey("accounting_natures.id", ondelete="SET NULL"), nullable=True, index=True
    )
    suggested_ledger_name: Mapped[str] = mapped_column(String(255), nullable=False, default="")
    suggested_confidence: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    suggestion_reason: Mapped[str | None] = mapped_column(Text, nullable=True)

    review_status: Mapped[str] = mapped_column(String(30), nullable=False, default="pending", index=True)
    final_nature_id: Mapped[int | None] = mapped_column(
        ForeignKey("accounting_natures.id", ondelete="SET NULL"), nullable=True, index=True
    )
    final_ledger_name: Mapped[str] = mapped_column(String(255), nullable=False, default="")
    review_note: Mapped[str | None] = mapped_column(Text, nullable=True)
    reviewed_by_user_id: Mapped[int | None] = mapped_column(
        ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )
    reviewed_at_utc: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

    created_by_user_id: Mapped[int | None] = mapped_column(
        ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )
    created_at_utc: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, default=lambda: datetime.now(timezone.utc), index=True
    )
    updated_at_utc: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
        default=lambda: datetime.now(timezone.utc),
        onupdate=lambda: datetime.now(timezone.utc),
    )