#!/usr/bin/env python3
# This script will clone all entries from the database. I ised this to show what happens with extreme database sizes.
#The output will be in excel-style CSV (";" instead of "," as column seperator.)

import sqlite3
from tqdm import tqdm

create_table = """
    CREATE TABLE WEB_URL(
    ID INTEGER PRIMARY KEY AUTOINCREMENT,
    LONG_URL TEXT NOT NULL, SHORT_URL TEXT NOT NULL
    );
    """
with sqlite3.connect('db/urls.db') as conn:
    cursor = conn.cursor()
    try: #Try making the database structure, if succeeded, exit, because there can't be any data.
        cursor.execute(create_table)
        raise Exception('No database Found', "Can't find the database ==> No data to clone")
    except sqlite3.OperationalError:
        pass

conn = sqlite3.connect('db/urls.db')
cursor = conn.cursor()
res = cursor.execute('SELECT LONG_URL, SHORT_URL FROM WEB_URL WHERE 1') #read all data from database
with sqlite3.connect('db/urls.db') as conn2:
    cursor2 = conn2.cursor()
    for entries in tqdm(res.fetchall()):
        cursor2.execute( #Insert the data in the SQL table
            'INSERT INTO WEB_URL (LONG_URL, SHORT_URL) VALUES (?, ?)',
            [entries[0], entries[1]]
        )
print("Database duplicated")