import uuid
from datetime import datetime
from sqlalchemy import Column, String, Date, DateTime, ForeignKey, UniqueConstraint, Index, Enum as SqlEnum
from sqlalchemy.orm import relationship
from utils.utils import Base


class Crewmember(Base):
    __tablename__ = "crew_members"

    id = Column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
    employee_number = Column(String(50), unique=True, nullable=False, index=True)
    first_name = Column(String(100), nullable=False)
    last_name = Column(String(100), nullable=False)
    email = Column(String(255), unique=True, nullable=False, index=True)
    phone = Column(String(50), nullable=False)
    date_of_birth = Column(Date, nullable=False)
    hire_date = Column(Date, nullable=False)
    role = Column(String(50), nullable=False)
    certification_number = Column(String(100), nullable=True)
    certification_expiry = Column(Date, nullable=True)
    status = Column(String(50), nullable=False, default="Active")
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)

    flight_crew_assignments = relationship("Flightcrewassignment", back_populates="crew_member", cascade="all, delete-orphan", passive_deletes=True)

    __table_args__ = (
        Index("ix_crew_members_status", "status"),
        Index("ix_crew_members_role", "role"),
    )


class Flightcrewassignment(Base):
    __tablename__ = "flight_crew_assignments"

    id = Column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
    flight_id = Column(String(36), ForeignKey("flights.id", ondelete="CASCADE"), nullable=False, index=True)
    crew_member_id = Column(String(36), ForeignKey("crew_members.id", ondelete="CASCADE"), nullable=False, index=True)
    assigned_role = Column(String(50), nullable=False)
    assignment_status = Column(String(50), nullable=False, default="Assigned")
    notes = Column(String(500), nullable=True)
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)

    flight = relationship("Flight", back_populates="flight_crew_assignments")
    crew_member = relationship("Crewmember", back_populates="flight_crew_assignments")

    __table_args__ = (
        UniqueConstraint("flight_id", "crew_member_id", name="uq_flight_crew_member"),
        Index("ix_flight_crew_assignments_status", "assignment_status"),
    )