# import sqlite3
# import os
# from flask import g
# # --- Database Functions ---
# DATABASE = "chat.db"

# def init_db():
#     if not os.path.exists(DATABASE):
#         with sqlite3.connect(DATABASE) as conn:
#             # Assuming schema.sql exists and is correctly defined
#             with open("schema.sql", "r") as f:
#                 conn.executescript(f.read())

# def get_db():
#     if "db" not in g:
#         g.db = sqlite3.connect(DATABASE)
#         g.db.row_factory = sqlite3.Row
#     return g.db

# def close_db(e=None):
#     db = g.pop("db", None)
#     if db is not None:
#         db.close()




import sqlite3
import os


# --- Database Constants ---
DATABASE = "/tmp/chat.db"

# --- Database Functions ---
def init_db():
    """Initializes the database if it doesn't exist."""
    if not os.path.exists(DATABASE):
        # Use a context manager to ensure the connection is closed
        with sqlite3.connect(DATABASE) as conn:
            # Check if schema.sql exists before trying to open it
            if os.path.exists("schema.sql"):
                with open("schema.sql", "r") as f:
                    conn.executescript(f.read())
            else:
                print("WARNING: schema.sql not found. Database will be created but will be empty.")
                # You might want to define the schema here directly if schema.sql is not guaranteed
                # For example:
                # conn.executescript("""
                # CREATE TABLE users (...);
                # CREATE TABLE conversations (...);
                # CREATE TABLE messages (...);
                # """)


def get_db():
    """
    Dependency function to get a database connection.
    This will be called for each request that needs a DB connection.
    """
    db = sqlite3.connect(DATABASE)
    db.row_factory = sqlite3.Row
    try:
        yield db
    finally:
        db.close()

# The close_db function is no longer needed as the `finally` block in `get_db` handles it.