import enum

from sqlalchemy import (
    Boolean,
    Column,
    DateTime,
    Enum,
    ForeignKey,
    Integer,
    String,
    Text,
)
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func

from app.db.session import Base


class TaskPriority(str, enum.Enum):
    """
    Enum for task priority levels
    """
    LOW = "low"
    MEDIUM = "medium"
    HIGH = "high"


class TaskStatus(str, enum.Enum):
    """
    Enum for task status
    """
    TODO = "todo"
    IN_PROGRESS = "in_progress"
    DONE = "done"


class Task(Base):
    """
    Task model for storing task information
    """
    __tablename__ = "tasks"

    id = Column(Integer, primary_key=True, index=True)
    title = Column(String, index=True, nullable=False)
    description = Column(Text, nullable=True)
    status = Column(Enum(TaskStatus), default=TaskStatus.TODO, nullable=False)
    priority = Column(Enum(TaskPriority), default=TaskPriority.MEDIUM, nullable=False)
    due_date = Column(DateTime(timezone=True), nullable=True)
    is_deleted = Column(Boolean, default=False)
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now()
    )

    # Foreign keys
    user_id = Column(
        Integer,
        ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False
    )

    # Relationships
    user = relationship("User", backref="tasks")