from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey, Enum
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func
import enum
from database import Base

class TaskStatus(str, enum.Enum):
    pending = "pending"
    completed = "completed"

class RecurrenceType(str, enum.Enum):
    none = "none"
    daily = "daily"
    weekly = "weekly"
    monthly = "monthly"
    custom = "custom"

class Task(Base):
    __tablename__ = "tasks"

    id = Column(Integer, primary_key=True, index=True)
    title = Column(String, index=True, nullable=False)
    description = Column(String, nullable=True)
    telegram_user_id = Column(String, index=True, nullable=False)
    status = Column(Enum(TaskStatus), default=TaskStatus.pending, nullable=False)
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

    reminders = relationship("Reminder", back_populates="task", cascade="all, delete-orphan")

class Reminder(Base):
    __tablename__ = "reminders"

    id = Column(Integer, primary_key=True, index=True)
    task_id = Column(Integer, ForeignKey("tasks.id"), nullable=False)
    trigger_time = Column(DateTime(timezone=True), nullable=False)
    recurrence_type = Column(Enum(RecurrenceType), default=RecurrenceType.none, nullable=False)
    recurrence_interval = Column(Integer, nullable=True) # E.g. every X minutes/hours if custom
    remind_count_limit = Column(Integer, default=0, nullable=False) # 0 for infinite
    remind_count_current = Column(Integer, default=0, nullable=False)
    notify_push = Column(Boolean, default=False, nullable=False)
    notify_telegram = Column(Boolean, default=False, nullable=False)
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

    task = relationship("Task", back_populates="reminders")