from sqlalchemy import create_engine, Column, Integer, String, Boolean, DateTime, Text
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from datetime import datetime
import os
from dotenv import load_dotenv

load_dotenv()

# SQLite Database URL
SQLITE_DATABASE_URL = os.getenv("SQLITE_DATABASE_URL", "sqlite:///./smart_line_bot.db")

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

Base = declarative_base()

# Database Models
class User(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True, index=True)
    username = Column(String, unique=True, index=True)
    email = Column(String, unique=True, index=True)
    hashed_password = Column(String)
    is_active = Column(Boolean, default=True)
    is_admin = Column(Boolean, default=False)
    created_at = Column(DateTime, default=datetime.utcnow)

class APIKey(Base):
    __tablename__ = "api_keys"

    id = Column(Integer, primary_key=True, index=True)
    key = Column(String, unique=True, index=True)
    name = Column(String)
    user_id = Column(Integer)  # Foreign key to User.id (simplified for now)
    is_active = Column(Boolean, default=True)
    created_at = Column(DateTime, default=datetime.utcnow)
    expires_at = Column(DateTime, nullable=True)
    last_used_at = Column(DateTime, nullable=True)

class Settings(Base):
    __tablename__ = "settings"

    id = Column(Integer, primary_key=True, index=True)
    key = Column(String, unique=True, index=True)
    value = Column(Text)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

# Create tables
def create_tables():
    Base.metadata.create_all(bind=engine)

# Dependency
def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()