import tkinter as tk
from tkinter import messagebox

# Fixed exchange rates
exchange_rates = {'NZD': {'USD': 0.68, 'CAD': 0.86},
                  'USD': {'NZD': 1.47, 'CAD': 1.27},
                  'CAD': {'NZD': 1.17, 'USD': 0.79}}

# Button colors
BUTTON_COLOR = "#4CAF50"  # Green
HELP_BUTTON_COLOR = "#FFD700"  # Gold

class CurrencyConverterApp:
    def __init__(self, root):
        self.root = root
        self.root.title("Currency Converter")

        # Create Frames
        self.input_frame = tk.Frame(root, padx=10, pady=10)
        self.input_frame.grid(row=0, column=0)

        self.result_frame = tk.Frame(root, padx=10, pady=10)
        self.result_frame.grid(row=1, column=0)

        # Labels and Entry
        self.from_currency_label = tk.Label(self.input_frame, text="From Currency:")
        self.from_currency_label.grid(row=0, column=0, padx=5, pady=5)

        self.from_currency_var = tk.StringVar()
        self.from_currency_menu = tk.OptionMenu(self.input_frame, self.from_currency_var, *exchange_rates.keys())
        self.from_currency_menu.grid(row=0, column=1, padx=5, pady=5)
        self.from_currency_var.set("NZD")

        self.to_currency_label = tk.Label(self.input_frame, text="To Currency:")
        self.to_currency_label.grid(row=1, column=0, padx=5, pady=5)

        self.to_currency_var = tk.StringVar()
        self.to_currency_menu = tk.OptionMenu(self.input_frame, self.to_currency_var, *exchange_rates.keys())
        self.to_currency_menu.grid(row=1, column=1, padx=5, pady=5)
        self.to_currency_var.set("USD")

        self.amount_label = tk.Label(self.input_frame, text="Amount:")
        self.amount_label.grid(row=2, column=0, padx=5, pady=5)

        self.amount_entry = tk.Entry(self.input_frame)
        self.amount_entry.grid(row=2, column=1, padx=5, pady=5)

        # Convert Button
        self.convert_button = tk.Button(self.input_frame, text="Convert", command=self.convert_currency, bg=BUTTON_COLOR)
        self.convert_button.grid(row=3, column=0, columnspan=2, padx=5, pady=5)

        # Result Label
        self.result_label = tk.Label(self.result_frame, text="", padx=10, pady=10)
        self.result_label.pack()

        # Help Button
        self.help_button = tk.Button(root, text="Help", command=self.display_help, bg=HELP_BUTTON_COLOR)
        self.help_button.grid(row=2, column=0, padx=5, pady=5)

    def convert_currency(self):
        from_currency = self.from_currency_var.get()
        to_currency = self.to_currency_var.get()

        try:
            amount = float(self.amount_entry.get())
        except ValueError:
            messagebox.showerror("Error", "Please enter a valid amount.")
            return

        converted_amount = amount * exchange_rates[from_currency][to_currency]
        self.result_label.config(text=f"{amount} {from_currency} equals {converted_amount:.2f} {to_currency}")

    def display_help(self):
        help_text = ("Welcome to the Currency Converter!\n\n"
                     "1. Select the 'From Currency' and 'To Currency' from the dropdown menus.\n"
                     "2. Enter the amount you want to convert in the 'Amount' field.\n"
                     "3. Click the 'Convert' button to see the conversion result.\n\n"
                     "Thank you for using our Currency Converter!")
        messagebox.showinfo("Help", help_text)


root = tk.Tk()
app = CurrencyConverterApp(root)
root.mainloop()