import math
import tkinter as tk
from tkinter import ttk, messagebox
from datetime import date
import re

# Updated exchange rates for 2024 (example values)
exchange_rates = {'NZD': {'USD': 0.60, 'CAD': 0.81},
                  'USD': {'NZD': 1.67, 'CAD': 1.36},
                  'CAD': {'NZD': 1.23, 'USD': 0.74}}

# Button colors
BUTTON_COLOR = "#fefae0"
HELP_BUTTON_COLOR = "#fefae0"

# Input Box Colours
INPUT_BOX_COLOUR = "#fefae0"

class CurrencyConverterApp:
    def display_help(self):
        self.root.withdraw()  # Hide the main window

    def __init__(self, root):
        self.root = root
        self.root.title("Currency Converter")
        self.root.configure(bg="#dda15e")  # Set background color for the entire window
        # Create Frames
        self.input_frame = tk.Frame(root, padx=10, pady=10, bg="#dda15e")
        self.input_frame.grid(row=0, column=0)

        self.result_frame = tk.Frame(root, padx=10, pady=10, bg="#dda15e")
        self.result_frame.grid(row=1, column=0)

        # Labels and Entry
        self.from_currency_label = tk.Label(self.input_frame, text="From Currency:", fg="#361d18",
                                            font=("Arial", 12, "bold"), bg="#dda15e")
        self.from_currency_label.grid(row=0, column=0, padx=5, pady=5)

        self.from_currency_var = tk.StringVar()
        self.from_currency_menu = ttk.Combobox(self.input_frame, textvariable=self.from_currency_var,
                                                values=list(exchange_rates.keys()), style="My.TCombobox")
        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:", fg="#361d18",
                                          font=("Arial", 12, "bold"), bg="#dda15e")
        self.to_currency_label.grid(row=1, column=0, padx=5, pady=5)

        self.to_currency_var = tk.StringVar()
        self.to_currency_menu = ttk.Combobox(self.input_frame, textvariable=self.to_currency_var,
                                              values=list(exchange_rates.keys()), style="My.TCombobox")
        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:", bg="#dda15e",  font=("Arial", 12, "bold"))
        self.amount_label.grid(row=2, column=0, padx=5, pady=5)

        self.amount_entry = tk.Entry(self.input_frame, bg="#fefae0")
        self.amount_entry.grid(row=2, column=1, padx=5, pady=5)

        # Result Label
        self.result_label = tk.Label(self.result_frame, text="", padx=10, pady=10, fg="#361d18",
                                     font=("Arial", 16, "bold"), bg="#dda15e")
        self.result_label.pack()
        # Convert Button
        self.convert_button = tk.Button(self.input_frame, text="Convert", command=self.convert_currency,
                                        bg=BUTTON_COLOR, fg="#361d18", font=("Arial", 12, "bold"))
        self.convert_button.grid(row=3, column=0, columnspan=2, padx=5, pady=5)



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

        if not amount:
            messagebox.showerror("Error", "Amount field cannot be empty!")
            self.amount_entry.config(bg="#e65f5c")
            return

        try:
            amount = float(amount)
            if amount <= 0 or math.copysign(1, amount) == 0:
                raise ValueError("Amount must be above 0!")
        except ValueError as e:
            messagebox.showerror("Error", "Invalid input! Please enter a positive number.")
            self.amount_entry.config(bg="#e65f5c")
            return
        else:
            self.amount_entry.config(bg="#fefae0")

        if from_currency == to_currency:
            messagebox.showerror("Error", "Please select different currencies.")
            self.amount_entry.config(bg="#e65f5c")
            return
        else:
            self.amount_entry.config(bg="#fefae0")

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


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