"""
用戶郵件別名 Model
支援員工在不同網域擁有多個郵件地址
"""
from datetime import datetime
from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey, UniqueConstraint, Index
from sqlalchemy.orm import relationship

from app.db.base import Base


class UserEmailAlias(Base):
    """用戶郵件別名表 (一個用戶可以有多個郵件地址)"""

    __tablename__ = "user_email_aliases"
    __table_args__ = (
        # 每個用戶只能有一個主要郵件
        Index("idx_user_primary_email", "user_id", unique=True, postgresql_where=Column("is_primary") == True),
        # 一般索引
        Index("idx_email_aliases_user", "user_id"),
        Index("idx_email_aliases_tenant", "tenant_id"),
        Index("idx_email_aliases_domain", "domain_id"),
    )

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("employees.id", ondelete="CASCADE"), nullable=False, index=True)
    tenant_id = Column(Integer, ForeignKey("organizes.id", ondelete="CASCADE"), nullable=False, index=True)
    domain_id = Column(Integer, ForeignKey("tenant_domains.id", ondelete="CASCADE"), nullable=False, index=True)

    email = Column(String(150), unique=True, nullable=False, index=True, comment="郵件地址 (sales@brand-a.com)")
    is_primary = Column(Boolean, default=False, nullable=False, comment="是否為主要郵件地址")

    # 時間記錄
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)

    # 關聯
    user = relationship("Employee", back_populates="email_aliases")
    domain = relationship("TenantDomain", back_populates="email_aliases")

    def __repr__(self):
        return f"<UserEmailAlias {self.email} ({'主要' if self.is_primary else '別名'})>"

    @property
    def local_part(self) -> str:
        """郵件前綴 (@ 之前的部分)"""
        return self.email.split('@')[0] if '@' in self.email else self.email

    @property
    def domain_part(self) -> str:
        """網域部分 (@ 之後的部分)"""
        return self.email.split('@')[1] if '@' in self.email else ""