#!/usr/bin/env python3
import sqlite3
import os

def withdraw(a):
    connDb = sqlite3.connect(a)
    cur = connDb.cursor()
    withUser = input("User?: ")
    userIn = int(input(f'{withUser}: Amount to withdraw: '))
    cur.execute("SELECT id FROM account where username=?", (withUser, ))
    userId = cur.fetchone()[0]
    cur.execute("SELECT balance from balance where id=?", (userId, ))
    prevAmt = cur.fetchone()[0]
    if (prevAmt - userIn) < 0:
        print("*** User cannot have a negative balance. ")
        withdraw(a)
    else:
        cur.execute("UPDATE balance SET balance=(?-?) WHERE id=?", (prevAmt, userIn, userId, ))
        connDb.commit()
        connDb.close()

def manBankin(a):
    while True:
        bankNam = a.split(".")[0]
        print("""
        1. Withdraw
        2. Deposit
        3. Transfer
        4. User Balance check
        Q. Go Back
        """)
        userIn = input(f"Bank/{bankNam}: ")
        if userIn == "1":
            withdraw(a)
        elif userIn == "2":
            print("Deposit")
        elif userIn == "3":
            print("Transfer")
        elif userIn == "4":
            print("User balance")
        elif userIn == "q" or userIn == "Q":
            break
        else:
            print('*** Option not understood. Please try again.')

def deluser(a):
    userIn = input("Which user would you like to delete? ")
    connDb = sqlite3.connect(a)
    cur = connDb.cursor()
    cur.execute("""UPDATE account SET active = 0 where username = ?""", (userIn,))
    connDb.commit()
    connDb.close()

def listuser(a):
    connDb = sqlite3.connect(a)
    cur = connDb.cursor()
    userQuery = cur.execute("SELECT username FROM account;")
    userQuery = cur.fetchone()
    connDb.close()
    matchs = userQuery
    print()
    print("User list: ")
    print("__________________________")
    for i in matchs:
        print(i.split(".")[0])
    print("__________________________")

def addUser(a):
    connDb = sqlite3.connect(a)
    cur = connDb.cursor()
    userIn = input('What user would you like to add? ')
    cur.execute("INSERT INTO account (username,active) VALUES(?,1)", (userIn,))
    cur.execute("INSERT INTO balance (balance) VALUES(0.00)")
    cur.execute("INSERT INTO banktrans (username,amount) VALUES(?,0.00)", (userIn,))
    connDb.commit()
    connDb.close()

def manageBankmenu(a):
    while True:
        print("""
        1. Add a user.
        2. Delete a user.
        3. List users.
        4. Banking Menu.
        Q. Go Back.
        """)
        menuOption = input("Bank: Choose from the menu: ")
        if menuOption == '1':
            addUser(a)
        elif menuOption == '2':
            deluser(a)
        elif menuOption == '3':
            listuser(a)
        elif menuOption == '4':
            manBankin(a)
        elif menuOption == 'q' or menuOption == 'Q':
            break
        else:
            print('*** Option not understood. Please try again.')

def selectBank():
    dirOutput = os.listdir()
    matchs = [match for match in dirOutput if 'db.sqlite' in match]
    #banks = dict(zip(matchs, range(len(matchs))))
    for i in matchs:
          print(i.split(".")[0])
    print()
    manBank = input('Choose which bank you would like to manage: ')
    manBank = manBank+".db.sqlite"
    manageBankmenu(manBank)

def addBank():
    bankName = input("What would you like to call this bank? ")
    bankName = bankName+".db.sqlite"
    connDb = sqlite3.connect(bankName)
    connDb.execute('''CREATE TABLE account
         (ID INTEGER PRIMARY KEY AUTOINCREMENT,
         USERNAME           TEXT    NOT NULL,
         TIMESTAMP  DATETIME DEFAULT CURRENT_TIMESTAMP, ACTIVE BOOLEAN NOT NULL);''')
    connDb.execute('''CREATE TABLE balance
         (ID INTEGER PRIMARY KEY AUTOINCREMENT,
         BALANCE           INTEGER    CHECK(BALANCE >= 0),
         TIMESTAMP  DATETIME DEFAULT CURRENT_TIMESTAMP);''')
    connDb.execute('''CREATE TABLE banktrans
         (ID INTEGER PRIMARY KEY,
         USERNAME           TEXT    NOT NULL,
         AMOUNT             INTEGER NOT NULL,
         TIMESTAMP  DATETIME DEFAULT CURRENT_TIMESTAMP);''')
    connDb.close()
    os.system('clear')
    print()
    print(f'*** Added bank {bankName}')
    print()

def listBank():
    dirOutput = os.listdir()
    matchs = [match for match in dirOutput if 'db.sqlite' in match]
    print()
    print('Banks found: ')
    print("__________________________")
    for i in matchs:
        print(i.split(".")[0])
    print("__________________________")

while True:
    print("""
        1. Select a Bank.
        2. Add new bank.
        3. List banks.
        4. Delete a bank.
        Q to quit.
        """) 
    mainOption = input("Choose an option: ")
    if mainOption == '1':
        selectBank()
    elif mainOption == '2':
        addBank()
    elif mainOption == '3':
        listBank()
    elif mainOption == '4':
        print('Place function here.')
    elif mainOption == 'Q' or mainOption == 'q':
        break
    else:
        print()
        print('*** Option not understood. Please try again.')