import uuid
import enum
from sqlalchemy import Column, String, Text, Boolean, DateTime, ForeignKey, Enum, JSON, Integer
from sqlalchemy.sql import func
from sqlalchemy.orm import relationship
from app.core.database import Base


class FieldType(str, enum.Enum):
    TEXT = "text"
    NUMBER = "number"
    DROPDOWN = "dropdown"
    DATE = "date"
    PERSON = "person"
    FORMULA = "formula"


class CustomField(Base):
    __tablename__ = "pjctrl_custom_fields"

    id = Column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
    project_id = Column(String(36), ForeignKey("pjctrl_projects.id", ondelete="CASCADE"), nullable=False)
    name = Column(String(100), nullable=False)
    field_type = Column(
        Enum("text", "number", "dropdown", "date", "person", "formula", name="field_type_enum"),
        nullable=False
    )
    options = Column(JSON, nullable=True)  # For dropdown: list of options
    formula = Column(Text, nullable=True)  # For formula: formula expression
    is_required = Column(Boolean, default=False, nullable=False)
    position = Column(Integer, default=0, nullable=False)  # For ordering fields
    created_at = Column(DateTime, server_default=func.now(), nullable=False)
    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now(), nullable=False)

    # Relationships
    project = relationship("Project", back_populates="custom_fields")
    values = relationship("TaskCustomValue", back_populates="field", cascade="all, delete-orphan")