"""Phase ops — lightweight business documents for Sales/Purchase/Inventory UI."""
from __future__ import annotations

import uuid
from datetime import date
from decimal import Decimal

from sqlalchemy import Boolean, Date, Index, Numeric, String, Text, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column

from app.core.database import Base
from app.models.base import TenantMixin, TimestampMixin, UUIDPrimaryKeyMixin
from app.models.types import GUID


class BusinessDocument(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    """Generic operational document used by Sales / Purchase / Inventory screens."""

    __tablename__ = "business_documents"

    module: Mapped[str] = mapped_column(String(40), nullable=False)
    doc_type: Mapped[str] = mapped_column(String(50), nullable=False)
    number: Mapped[str] = mapped_column(String(50), nullable=False)
    doc_date: Mapped[date] = mapped_column(Date, nullable=False)
    party_name: Mapped[str | None] = mapped_column(String(255), nullable=True)
    party_id: Mapped[uuid.UUID | None] = mapped_column(GUID(), nullable=True)
    amount: Mapped[Decimal] = mapped_column(Numeric(18, 4), default=Decimal("0"), nullable=False)
    status: Mapped[str] = mapped_column(String(30), default="draft", nullable=False)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    meta_json: Mapped[str | None] = mapped_column(Text, nullable=True)

    __table_args__ = (
        UniqueConstraint("tenant_id", "module", "number", name="uq_biz_doc_tenant_module_number"),
        Index("ix_biz_doc_tenant_module_type", "tenant_id", "module", "doc_type"),
    )


class InventoryItem(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "inventory_items"

    code: Mapped[str] = mapped_column(String(50), nullable=False)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    item_type: Mapped[str] = mapped_column(String(30), default="goods", nullable=False)
    unit: Mapped[str] = mapped_column(String(30), default="عدد", nullable=False)
    quantity_on_hand: Mapped[Decimal] = mapped_column(Numeric(18, 4), default=Decimal("0"), nullable=False)
    unit_cost: Mapped[Decimal] = mapped_column(Numeric(18, 4), default=Decimal("0"), nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)

    __table_args__ = (
        UniqueConstraint("tenant_id", "code", name="uq_inventory_item_tenant_code"),
    )


class Warehouse(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "warehouses"

    code: Mapped[str] = mapped_column(String(50), nullable=False)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)

    __table_args__ = (
        UniqueConstraint("tenant_id", "code", name="uq_warehouse_tenant_code"),
    )