from sqlalchemy import Column, Integer, String, Float, DateTime, ForeignKey, Enum as SQLEnum
from sqlalchemy.orm import relationship
from datetime import datetime
from app.database import Base
import enum

class ItemType(str, enum.Enum):
    GROCERY = "grocery"
    MEDICATION = "medication"
    SUPPLEMENT = "supplement"

class InventoryStatus(str, enum.Enum):
    NORMAL = "normal"
    LOW = "low"
    OUT = "out"

class UserMedicationProfile(Base):
    __tablename__ = "user_medication_profiles"
    
    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(String, index=True, default="default_user")
    allergies = Column(String, nullable=True)
    
    dose_events = relationship("DoseEvent", back_populates="profile")
    medication_items = relationship("MedicationItem", back_populates="profile")

class DoseEvent(Base):
    __tablename__ = "dose_events"
    
    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(String, index=True, default="default_user")
    profile_id = Column(Integer, ForeignKey("user_medication_profiles.id"))
    item_name = Column(String, index=True)
    amount_mg = Column(Float)
    timestamp = Column(DateTime, default=datetime.utcnow)
    source = Column(String, default="manual")
    
    profile = relationship("UserMedicationProfile", back_populates="dose_events")

class MedicationItem(Base):
    __tablename__ = "medication_items"
    
    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(String, index=True, default="default_user")
    profile_id = Column(Integer, ForeignKey("user_medication_profiles.id"))
    display_name = Column(String, index=True)
    strength = Column(String, nullable=True)
    form = Column(String, nullable=True)
    indication_plain = Column(String, nullable=True)
    instructions_plain = Column(String, nullable=True)
    warnings_plain = Column(String, nullable=True)
    barcode = Column(String, nullable=True)
    last_reviewed = Column(DateTime, default=datetime.utcnow)
    max_daily_dose_mg = Column(Float, nullable=True)
    
    profile = relationship("UserMedicationProfile", back_populates="medication_items")
    inventory_links = relationship("InventoryItem", back_populates="linked_item")

class InventoryItem(Base):
    __tablename__ = "inventory_items"
    
    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(String, index=True, default="default_user")
    name = Column(String, index=True)
    type = Column(SQLEnum(ItemType), default=ItemType.GROCERY)
    linked_item_id = Column(Integer, ForeignKey("medication_items.id"), nullable=True)
    quantity_estimate = Column(Integer, default=1)
    last_purchased_at = Column(DateTime, default=datetime.utcnow)
    status = Column(SQLEnum(InventoryStatus), default=InventoryStatus.NORMAL)
    
    linked_item = relationship("MedicationItem", back_populates="inventory_links")