"""
Ticket Model - ServiceManagerWeb
"""
from sqlalchemy import String, ForeignKey, Text
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.dialects.postgresql import UUID, ENUM
from typing import Optional, TYPE_CHECKING
import enum
import uuid

from app.core.database import Base
from .tenant import Tenant
from .system import System
from .user import User

if TYPE_CHECKING:
    from app.models.category import Category

class TicketStatus(str, enum.Enum):
    NEW = "NEW"
    TRIAGE = "TRIAGE"
    IN_PROGRESS = "IN_PROGRESS"
    WAITING_FOR_CLIENT = "WAITING_FOR_CLIENT"
    RESOLVED = "RESOLVED"
    CLOSED = "CLOSED"
    REOPENED = "REOPENED"

class TicketPriority(str, enum.Enum):
    LOW = "LOW"
    MEDIUM = "MEDIUM"
    HIGH = "HIGH"
    URGENT = "URGENT"

class Ticket(Base):
    __tablename__ = "tickets"
    
    # Note: id, created_at, updated_at are inherited from Base
    
    tenant_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("tenants.id", ondelete="CASCADE"), nullable=False)
    
    ticket_number: Mapped[str] = mapped_column(String(20), nullable=False)
    subject: Mapped[str] = mapped_column(String(255), nullable=False)
    description: Mapped[str] = mapped_column(Text, nullable=False)
    
    status: Mapped[TicketStatus] = mapped_column(ENUM(TicketStatus, name="ticket_status_enum", create_type=False), default=TicketStatus.NEW)
    priority: Mapped[TicketPriority] = mapped_column(ENUM(TicketPriority, name="ticket_priority_enum", create_type=False), default=TicketPriority.MEDIUM)
    
    # Foreign Keys
    created_by: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=False)
    assigned_to: Mapped[Optional[uuid.UUID]] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
    
    affected_system_id: Mapped[Optional[uuid.UUID]] = mapped_column(UUID(as_uuid=True), ForeignKey("systems.id"), nullable=True)
    category_id: Mapped[Optional[uuid.UUID]] = mapped_column(UUID(as_uuid=True), ForeignKey("categories.id"), nullable=True)

    # Relationships
    tenant: Mapped["Tenant"] = relationship("Tenant", back_populates="tickets")
    
    system: Mapped["System"] = relationship("System", back_populates="tickets")
    category: Mapped["Category"] = relationship("Category", back_populates="tickets")
    
    created_by_user: Mapped["User"] = relationship(
        "User", 
        foreign_keys=[created_by], 
        back_populates="created_tickets"
    )
    
    assigned_to_user: Mapped[Optional["User"]] = relationship(
        "User", 
        foreign_keys=[assigned_to], 
        back_populates="assigned_tickets"
    )