StockMarket

// main:
using System;

namespace StockMarket
{
    public class StartUp
    {
        static void Main(string[] args)
        {
            // Sample Code Usage:

            // Initialize Investor
            Investor investor = new Investor("Peter Lynch", "p.lynch@gmail.com", 2000m, "Fidelity");

            // Initialize Stock
            Stock ibmStock = new Stock("IBM", "Arvind Krishna", 138.50m, 5000);

            // Print a stock
            Console.WriteLine(ibmStock.ToString());

            // Company: IBM
            // Director: Arvind Krishna
            // Price per share: $138.50
            // Market capitalization: $692500.00

            // Buy a stock
            investor.BuyStock(ibmStock);

            // Sell a stock
            Console.WriteLine(investor.SellStock("IBM", 150.00m)); // "IBM was sold."
                                                                   // Add stocks
            Stock teslaStock = new Stock("Tesla", "Elon Musk", 743.17m, 6520);
            Stock amazonStock = new Stock("Amazon", "Jeff Bezos", 3457.17m, 8500);
            Stock twitterStock = new Stock("Twitter", "Jack Dorsey", 59.66m, 11200);
            Stock blizzardStock = new Stock("Activision Blizzard", "Bobby Kotick", 78.53m, 5520);

            // Buy more stocks
            investor.BuyStock(teslaStock);
            investor.BuyStock(amazonStock);
            investor.BuyStock(twitterStock);
            investor.BuyStock(blizzardStock);

            // FindBiggestCompany
            Console.WriteLine(investor.FindBiggestCompany());

            // Company: Tesla
            // Director: Elon Musk
            // Price per share: $743.17
            // Market capitalization: $4845468.40

            // Print investor information
            Console.WriteLine(investor.InvestorInformation());

            // The investor Peter Lynch with a broker Fidelity has stocks:
            // Company: Tesla
            // Director: Elon Musk
            // Price per share: $743.17
            // Market capitalization: $4845468.40
            // Company: Twitter
            // Director: Jack Dorsey
            // Price per share: $59.66
            // Market capitalization: $668192.00
            // Company: Activision Blizzard
            // Director: Bobby Kotick
            // Price per share: $78.53
            // Market capitalization: $433485.60

        }
    }
}


// class Stock:
using System;

namespace StockMarket
{
    public class Stock
    {
        public Stock(string companyName, string director, decimal pricePerShare, int totalNumberOfShares)
        {
            CompanyName = companyName;
            Director = director;
            PricePerShare = pricePerShare;
            TotalNumberOfShares = totalNumberOfShares;
        }

        public string CompanyName { get; set; }
        public string Director { get; set; }
        public decimal PricePerShare { get; set; }
        public int TotalNumberOfShares { get; set; }
        public decimal MarketCapitalization
        {
            get
            {
                return PricePerShare * TotalNumberOfShares;
            }
        }

        public override string ToString()
        {
            return $"Company: {CompanyName}{Environment.NewLine}" +
                $"Director: {Director}{Environment.NewLine}" +
                $"Price per share: ${PricePerShare}{Environment.NewLine}" +
                $"Market capitalization: ${ MarketCapitalization}";

        }
    }
}


//repository class Investor:

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

namespace StockMarket
{
    public class Investor
    {
        private readonly Dictionary<string, Stock> portfolio;

        public Investor(string fullName, string emailAddress, decimal moneyToInvest, string brokerName)
        {
            FullName = fullName;
            EmailAddress = emailAddress;
            MoneyToInvest = moneyToInvest;
            BrokerName = brokerName;
            this.portfolio = new Dictionary<string, Stock>();
        }

        public string FullName { get; set; }
        public string EmailAddress { get; set; }
        public decimal MoneyToInvest { get; set; }
        public string BrokerName { get; set; }

        public int Count
        {
            get
            {
                return portfolio.Count;
            }
        }


        public void BuyStock(Stock stock)
        {
            if(stock.MarketCapitalization > 10000 &&
                this.MoneyToInvest >= stock.PricePerShare)
            {
                if (!portfolio.ContainsKey(stock.CompanyName))
                {
                    portfolio.Add(stock.CompanyName, stock);

                    this.MoneyToInvest -= stock.PricePerShare;
                }
            }
        }

        public string SellStock(string companyName, decimal sellPrice)
        {
            if (portfolio.ContainsKey(companyName))
            {
                if(sellPrice < portfolio[companyName].PricePerShare)
                {
                    return $"Cannot sell {companyName}.";
                }
                else
                {
                    this.MoneyToInvest += sellPrice;
                    portfolio.Remove(companyName);
                    return $"{companyName} was sold.";
                }
            }
            else
            {
                return $"{companyName} does not exist.";
            }
        }

        public Stock FindStock(string companyName)
        {
            if (portfolio.ContainsKey(companyName))
            {
                return portfolio[companyName];
            }
            else
            {
                return null;
            }
        }

        public Stock FindBiggestCompany()
        {
            return portfolio.OrderByDescending(x => x.Value.MarketCapitalization).FirstOrDefault().Value;
        }

        public string InvestorInformation()
        {
            StringBuilder sb = new StringBuilder();

            sb.AppendLine($"The investor {this.FullName} with a broker {this.BrokerName} has stocks:");

            foreach (var stock in portfolio)
            {
                sb.AppendLine(stock.Value.ToString());
            }

            return sb.ToString().TrimEnd();
        }
    }
}