import json
from sqlalchemy import create_engine, Column, Integer, String, Text, DateTime, ForeignKey, func
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relationship
from sqlalchemy.types import TypeDecorator, TEXT

# Custom type for JSON storage
class JSONText(TypeDecorator):
    impl = TEXT

    def process_bind_param(self, value, dialect):
        if value is not None:
            return json.dumps(value)
        return None

    def process_result_value(self, value, dialect):
        if value is not None:
            return json.loads(value)
        return None

# Database connection URL (using SQLite)
DATABASE_URL = "sqlite:///./api_proxy.db"

# Create SQLAlchemy engine
engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})

# Create a configured "Session" class
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# Base class for declarative models
Base = declarative_base()

# Define the KeyCategory model
class KeyCategory(Base):
    __tablename__ = "key_categories"

    id = Column(Integer, primary_key=True, index=True)
    name = Column(String, unique=True, index=True, nullable=False)
    type = Column(String, nullable=False)
    tags = Column(JSONText) # Stored as JSON string
    metadata_ = Column(JSONText, name="metadata") # Map to 'metadata' column in DB

    api_keys = relationship("APIKey", back_populates="category")

    created_at = Column(DateTime, server_default=func.now())
    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())

# Define the APIKey model
class APIKey(Base):
    __tablename__ = "api_keys"

    id = Column(Integer, primary_key=True, index=True)
    value = Column(String, nullable=False)
    category_id = Column(Integer, ForeignKey("key_categories.id"), nullable=False)
    status = Column(String, default="active", nullable=False) # 'active', 'inactive'
    usage_count = Column(Integer, default=0, nullable=False)
    last_used = Column(DateTime)
    metadata_ = Column(JSONText, name="metadata") # Map to 'metadata' column in DB

    category = relationship("KeyCategory", back_populates="api_keys")

    created_at = Column(DateTime, server_default=func.now())
    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())

# Function to create database tables
def create_db_tables():
    Base.metadata.create_all(bind=engine)

# Dependency to get DB session
def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()