/*

  Budget Management Application
  ____________________________________
  Sara Omar Ismail - 252000512

*/

import 'dart:io';

void main() {
  List<Map<String, double>> incomeList = [];
  List<Map<String, double>> expenseList = [];
  bool exit = false;

  print("Welcome to the Budget Management Application!");

  while (!exit) {
    print("""

  --- MENUE ---
Please choose an option:
_________________________________

1. Add income
2. Add expense
3. View summary
4. Exit
_________________________________

Enter Your Choise:""");

    String? user_choise = stdin.readLineSync();

    switch (user_choise) {
      case "1":
        // handel add income
        bool income_amount_added = false;
        print("Enter income description ");
        String? income_description = stdin.readLineSync();
        while (!income_amount_added) {
          print("Enter income amount ");

          String? input = stdin.readLineSync();

          if (input == null || input.trim().isEmpty) {
            print("⚠️ income amount is requierd");
            continue;
          }

          double? income_amount = double.tryParse(input);
          if (income_amount == null) {
            print("⚠️ Please Enter A vaild income ammount");
            continue;
          }

          if (income_amount < 0) {
            print("⚠️ Income Amount Should be grater than 0");
            continue;
          }

          incomeList.add({
            income_description ?? "No Description": income_amount,
          });
          income_amount_added = true;
        }

        print("✅ $income_description income ADDED");

        break;
      case "2":
        // handel add expense
        bool expense_amount_added = false;
        print("Enter expense description ");
        String? expense_description = stdin.readLineSync();
        while (!expense_amount_added) {
          print("Enter expense amount ");

          String? input = stdin.readLineSync();

          if (input == null || input.trim().isEmpty) {
            print("⚠️ expense amount is requierd");
            continue;
          }

          double? expense_amount = double.tryParse(input);
          if (expense_amount == null) {
            print("⚠️ Please Enter A vaild expense ammount");
            continue;
          }

          if (expense_amount < 0) {
            print("⚠️ expense Amount Should be grater than 0");
            continue;
          }

          expenseList.add({
            expense_description ?? "No Description": expense_amount,
          });
          expense_amount_added = true;
        }
        print("✅ $expense_description expense ADDED");

        break;
      case "3":
        //handel View summary
        double total_income = incomeList.fold(
          0.0,
          (sum, income) => sum + income.values.first,
        );
        double total_expense = expenseList.fold(
          0.0,
          (sum, expense) => sum + expense.values.first,
        );
        double net = total_income - total_expense;
        String net_status = "profit";
        bool tax_to_pay = true;
        if (total_expense > total_income) {
          net_status = "loss";
          tax_to_pay = false;
        }

        print("""
          Summary:
          Total income: $total_income
          Total expenses: $total_expense
          Net $net_status: $net
        """);
        if (tax_to_pay) {
          print("     💵 Tax to be paid: ${0.15 * net}");
        }
        break;
      case "4":
        // handel exit state
        exit = true;
        print("Exiting the system. Goodbye!");

        break;

      default:
        print("Enter Valid Choise!");
    }
    if (!exit) print("🚀 Going back to the main menu .....");
  }
}