"""
Modelos ORM para gestión de partes/componentes
"""
from sqlalchemy import Column, Integer, String, DateTime, Boolean, Text, Numeric, SmallInteger, ForeignKey
from sqlalchemy.sql import func
from sqlalchemy.orm import relationship
from core.database import Base
import enum

# Importar modelos relacionados para type hints y relationships
from typing import TYPE_CHECKING, Optional

if TYPE_CHECKING:
    from api.v1.modules.public.reference_data.countries.models import Country
    from api.v1.modules.public.reference_data.currency_types.models import CurrencyType
    from api.v1.modules.a76.classes.models import Class


class Part(Base):
    """
    Modelo para la tabla GPartes - Información de partes en los sistemas SCAII (N), SCAF (S) Y WINSAAI (W)
    """
    __tablename__ = "parts"
    __table_args__ = {"schema": "a76"}
    
    # Primary key compuesta
    client_key = Column(Integer, primary_key=True, nullable=False)
    part_number = Column(String(49), primary_key=True, nullable=False)
    
    # Basic information
    fraction = Column(String(10), nullable=True)
    description_spanish = Column(String(500), nullable=True)
    description_english = Column(String(500), nullable=True)
    part_class = Column(String(8), nullable=True)
    unit_of_measure = Column(String(5), nullable=True)
    commercial_part_number = Column(String(70), nullable=True)
    country_of_origin = Column(String(3), ForeignKey('public.countries.m3_key'), nullable=True)
    
    # Pricing and currency
    unit_cost = Column(Numeric(23, 8), nullable=True)
    currency_type = Column(String(2), nullable=True)
    currency_key = Column(String(3), ForeignKey('public.currency_types.code'), nullable=True)
    
    # Weight information
    unit_weight = Column(Numeric(19, 8), nullable=True)
    weight_type = Column(String(6), nullable=True)
    
    # Classification and regulatory
    us_fraction = Column(String(16), nullable=True)  # FRACCIONAME
    fda_key = Column(String(20), nullable=True)
    fcc_key = Column(String(30), nullable=True)
    license_code = Column(String(3), nullable=True)
    eccn = Column(String(20), nullable=True)  # Export Control Classification Number
    export_code = Column(String(2), nullable=True)
    exclusion_symbol = Column(String(19), nullable=True)  # SIMBOLOEXCLIC
    
    # Additional information
    supplier = Column(String(14), nullable=True)
    alternate_unit_measure = Column(String(14), nullable=True)
    added_value = Column(Numeric(23, 8), nullable=True)
    
    # Status and dates
    enabled_disabled = Column(SmallInteger, nullable=True)
    creation_date = Column(Integer, nullable=True)  # FECHACREACIONPARTE
    modification_date = Column(Integer, nullable=True)  # FECHAMODIFICA
    modification_date_iso = Column(DateTime(timezone=True), nullable=True)  # FECHAMODIFICA_ISO
    
    # Media
    part_photo = Column(String(255), nullable=True)
    
    # Relationships
    country = relationship("Country", foreign_keys=[country_of_origin])
    currency = relationship("CurrencyType", foreign_keys=[currency_key])
    
    # Relationship with Class through composite foreign key
    # Note: This requires both client_key and part_class to match client_key and class_code in Class
    part_class_info = relationship(
        "Class",
        primaryjoin="and_(Part.client_key == Class.client_key, Part.part_class == Class.class_code)",
        foreign_keys="[Part.client_key, Part.part_class]",
        viewonly=True,
        back_populates="parts"
    )
    
    tenant_id = Column(String, ForeignKey("a76.tenants.id"), nullable=False)

    def __repr__(self):
        return f"<Part(client_key={self.client_key}, part_number='{self.part_number}', description='{self.description_spanish}')>"