from tkinter import *
from tkinter import messagebox
from random import choice, randint, shuffle
import pyperclip
import json


# ---------------------------- PASSWORD GENERATOR ------------------------------- #
def generate_password():
    """
    Generates a random password, with 8-10 letters, 2-4 symbols and 2-4 numbers.
    :return: Password as a string.
    """
    password_entry.delete(0, END)
    letters = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u',
               'v',
               'w', 'x', 'y', 'z', 'A', 'B',
               'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
               'X',
               'Y', 'Z']
    numbers = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
    symbols = ['!', '#', '$', '%', '&', '(', ')', '*', '+']

    p_letters = [choice(letters) for _ in range(randint(8, 10))]
    p_symbols = [choice(symbols) for _ in range(randint(2, 4))]
    p_numbers = [choice(numbers) for _ in range(randint(2, 4))]
    pwd = p_letters + p_symbols + p_numbers
    shuffle(pwd)

    password = "".join(pwd)
    password_entry.insert(0, password)
    pyperclip.copy(password)


# ---------------------------- SAVE PASSWORD ------------------------------- #
def save():
    website = website_entry.get()
    email = email_entry.get()
    password = password_entry.get()
    new_data = {
        website: {
            "email": email,
            "password": password,
        }
    }

    if len(website) == 0 or len(password) == 0:
        messagebox.showerror(title="Oops!", message="Please make sure you haven't left any fields empty.")

    else:
        ok_user = messagebox.askokcancel(title=website, message=f"These are the details entered:\nEmail: {email}"
                                                                    f"\nPassword: {password} \nIs it okay to save?")
        if ok_user:
            try:
                with open("data.json", "r") as data_file:
                    # Reading old data
                    data = json.load(data_file)
            except FileNotFoundError:
                with open("data.json", "w") as data_file:
                    json.dump(new_data, data_file, indent=4)
            except json.JSONDecodeError:
                data = dict()

            else:
                # Updating old data with new data
                data.update(new_data)

                with open("data.json", "w") as data_file:
                    # Saving updated data
                    json.dump(data, data_file, indent=4)

            finally:
                website_entry.delete(0, END)
                password_entry.delete(0, END)


# ---------------------------- SEARCH PASSWORD ------------------------------- #
def search_password():
    website = website_entry.get()
    password= password_entry.get()
    if len(website) == 0:
        messagebox.showerror(title="Oops!", message="Please make sure you haven't left any fields empty.")
    else:
        try:
            with open("data.json") as data_file:
                data = json.load(data_file)
        except FileNotFoundError:
            messagebox.showerror(title="Error!", message="No data file found" )
        else:
            if website in data:
                email = data[website]["email"]
                password = data[website]["password"]
                messagebox.showinfo(title=website, message=f"Email: {email} \nPassword: {password}")
            else:
                messagebox.showerror(title="Error!", message=f"No details for {website} exists.")

# ---------------------------- UI SETUP ------------------------------- #
window = Tk()
window.title("Password Manager")
window.config(padx=50, pady=50)

canvas = Canvas(width=220, height=220, highlightthickness=0)
logo_img = PhotoImage(file="GUI/logo.png")
canvas.create_image(100, 100, image=logo_img)
canvas.grid(column=1, row=0)

# Labels
website_label = Label(text="Website:")
website_label.grid(column=0, row=1)
email_label = Label(text="Email/Username:")
email_label.grid(column=0, row=2)
password_label = Label(text="Password:")
password_label.grid(column=0, row=3)

# Enteries
website_entry = Entry(width=23)
website_entry.grid(column=1, row=1)
website_entry.focus()
email_entry = Entry(width=40)
email_entry.grid(column=1, row=2, columnspan=2)
email_entry.insert(0, "hello@iamMontek.com")
password_entry = Entry(width=23)
password_entry.grid(column=1, row=3)

# Buttons
search_button = Button(text="Search", width=12, command=search_password)
search_button.grid(column=2, row=1)
generate_password_button = Button(text="Generate Password", command=generate_password)
generate_password_button.grid(column=2, row=3)
add_button = Button(text="Add", width=30, command=save)
add_button.grid(column=1, row=4, columnspan=2)

window.mainloop()