Andrey and Billiard2

using System;
using System.Collections.Generic;
using System.Linq;

namespace Last_Exe
{
    class Client
    {
        public string Name { get; set; }
        public Dictionary<string, int> Order { get; set; }
        public decimal Bill { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            Dictionary<string, decimal> priceList = new Dictionary<string, decimal>(); // всички продукти и цени
            List<Client> clients = new List<Client>(); // всички клиенти + техните поръчки и сметка

            for (int i = 0; i < n; i++)
            {
                string[] beverige = Console.ReadLine().Split('-').ToArray();
                if (!priceList.ContainsKey(beverige[0]))
                {
                    priceList.Add(beverige[0], decimal.Parse(beverige[1]));
                }
                priceList[beverige[0]] = decimal.Parse(beverige[1]);
            }

            string[] currentOrder = Console.ReadLine().Split(new char[] { '-', ',', ' ' }, StringSplitOptions.RemoveEmptyEntries).ToArray();
            while (currentOrder[0] != "end")
            {
                string name = currentOrder[0];
                string product = currentOrder[1];
                int quantity = int.Parse(currentOrder[2]);

                Dictionary<string, int> current = new Dictionary<string, int>(); // текуща поръчка - продукт и брой

                if (priceList.ContainsKey(product)) // проверка дали продуктът съществува
                {
                    var clientIneed = clients.FirstOrDefault(x => x.Name == name); // проверка дали клиентът съществува

                    if (clientIneed == null)
                    {
                        var client = new Client();
                        client.Name = name;
                        current.Add(product, quantity);
                        client.Order = current;

                        foreach (var item in priceList.Where(x => x.Key == product))
                        {
                            client.Bill += quantity * item.Value;
                        }
                        clients.Add(client);
                    }

                    else
                    {
                        var productIneedKVP = clientIneed.Order.FirstOrDefault(x => x.Key == product); // проверка дали клиентът е поръчвал от същия продукт
                        var productIneed = productIneedKVP.Key;

                        if (productIneed == null)
                        {
                            clientIneed.Order.Add(product, quantity);
                            foreach (var item in priceList.Where(x => x.Key == product))
                            {
                                clientIneed.Bill += quantity * item.Value;
                            }
                        }

                        else
                        {
                            clientIneed.Order[productIneed] += quantity;
                            foreach (var item in priceList.Where(x => x.Key == product))
                            {
                                clientIneed.Bill += quantity * item.Value;
                            }
                        }
                    }
                }
                currentOrder = Console.ReadLine().Split(new char[] { '-', ',', ' ' }, StringSplitOptions.RemoveEmptyEntries).ToArray();
            }

            decimal totalBill = 0;
            foreach (var item in clients.OrderBy(x => x.Name))
            {
                Console.WriteLine($"{item.Name}");

                foreach (var itemm in item.Order)
                {
                    Console.WriteLine($"-- {itemm.Key} - { itemm.Value}");
                }

                Console.WriteLine($"Bill: {item.Bill:f2}");
                totalBill += item.Bill;
            }
            Console.WriteLine($"Total bill: {totalBill:f2}");
        }
    }
}