from sqlalchemy import create_engine, Column, Integer, String, Boolean, DateTime, JSON, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relationship
from datetime import datetime

DATABASE_URL = "sqlite:///./mailer.db"

engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

class User(Base):
    __tablename__ = "users"
    id = Column(Integer, primary_key=True, index=True)
    email = Column(String, unique=True, index=True)
    sender_name = Column(String, nullable=True)
    reply_to = Column(String, nullable=True)
    google_token = Column(JSON)  # Stores credentials object as JSON
    created_at = Column(DateTime, default=datetime.utcnow)

class Campaign(Base):
    __tablename__ = "campaigns"
    id = Column(Integer, primary_key=True, index=True)
    name = Column(String)
    subject = Column(String)
    user_id = Column(Integer, ForeignKey("users.id"))
    steps = Column(JSON)  # List of {day: int, message: str}
    status = Column(String, default="active")  # active, paused, finished
    created_at = Column(DateTime, default=datetime.utcnow)

class Lead(Base):
    __tablename__ = "leads"
    id = Column(Integer, primary_key=True, index=True)
    email = Column(String, index=True)
    campaign_id = Column(Integer, ForeignKey("campaigns.id"))
    data = Column(JSON)  # Placeholders like {name: "John", company: "Google"}
    current_step = Column(Integer, default=0)
    last_contact_at = Column(DateTime)
    thread_id = Column(String, nullable=True) # Gmail Thread ID
    status = Column(String, default="pending")  # pending, emailed, replied, bounced
    created_at = Column(DateTime, default=datetime.utcnow)

def init_db():
    Base.metadata.create_all(bind=engine)