# File: db_schema.py
import sqlite3

DB_NAME = "swiggy_orders.db"


def init_db(db_path: str = DB_NAME) -> None:
    """
    Initialize the SQLite database with the necessary tables.
    """
    conn = sqlite3.connect(db_path)
    c = conn.cursor()
    # Orders metadata
    c.execute(
        """
        CREATE TABLE IF NOT EXISTS orders (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            email_number INTEGER,
            order_date TEXT,
            order_time TEXT,
            restaurant_name TEXT,
            delivery_address TEXT,
            total_price REAL
        )
        """
    )
    # Individual items per order
    c.execute(
        """
        CREATE TABLE IF NOT EXISTS order_items (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            order_id INTEGER,
            item_name TEXT,
            quantity INTEGER,
            price REAL,
            FOREIGN KEY(order_id) REFERENCES orders(id)
        )
        """
    )
    conn.commit()
    conn.close()


def get_db_connection(db_path: str = DB_NAME) -> sqlite3.Connection:
    """Return a new connection to the database."""
    return sqlite3.connect(db_path)


def get_orders_by_date_from_db(date_str: str) -> list[dict]:
    """
    Fetch all orders and their items for a given date from the database.
    """
    conn = get_db_connection()
    c = conn.cursor()
    c.execute(
        "SELECT id, email_number, order_time, restaurant_name, delivery_address, total_price"
        " FROM orders WHERE order_date = ?",
        (date_str,)
    )
    orders = []
    for order_id, email_number, order_time, restaurant_name, delivery_address, total_price in c.fetchall():
        # fetch items for this order
        c.execute(
            "SELECT item_name, quantity, price FROM order_items WHERE order_id = ?",
            (order_id,)
        )
        items = [
            {"name": name, "quantity": qty, "price": price}
            for name, qty, price in c.fetchall()
        ]
        orders.append({
            "email_number": email_number,
            "order_date": date_str,
            "order_time": order_time,
            "restaurant_name": restaurant_name,
            "delivery_address": delivery_address,
            "items": items,
            "total_price": total_price
        })
    conn.close()
    return orders


def save_orders_to_db(date_str: str, orders: list[dict]) -> None:
    """
    Insert scraped orders and their items for a given date into the database.
    """
    conn = get_db_connection()
    c = conn.cursor()
    for order in orders:
        c.execute(
            """
            INSERT INTO orders
                (email_number, order_date, order_time, restaurant_name, delivery_address, total_price)
            VALUES (?, ?, ?, ?, ?, ?)
            """,
            (
                order["email_number"],
                date_str,
                order["order_time"],
                order["restaurant_name"],
                order["delivery_address"],
                order["total_price"]
            )
        )
        order_id = c.lastrowid
        for item in order.get("items", []):
            c.execute(
                """
                INSERT INTO order_items
                    (order_id, item_name, quantity, price)
                VALUES (?, ?, ?, ?)
                """,
                (
                    order_id,
                    item["name"],
                    item["quantity"],
                    item["price"]
                )
            )
    conn.commit()
    conn.close()