using System.Collections.Generic;
using System.Linq;
using System.Text;
using OlympicGames.Core.Commands.Abstracts;
using OlympicGames.Core.Contracts;

namespace OlympicGames.Core.Commands
{
    public class ListOlympiansCommand : Command
    {
        public ListOlympiansCommand(IList<string> commandLine, IOlympicCommittee committee)
            : base(commandLine, committee)
        {
        }

        public override string Execute()
        {
            if (this.Committee.Olympians.Count != 0)
            {
                var defaultOrder = this.Committee.Olympians.OrderBy(x => x.FirstName).ToList();
                if (this.CommandParameters.Count > 0)
                {
                    if (this.CommandParameters[0] == "lastname")
                        defaultOrder = defaultOrder.OrderBy(c => c.LastName).ToList();
                    if (this.CommandParameters[0] == "country")
                        defaultOrder = defaultOrder.OrderBy(c => c.Country).ToList();
                }
                if (this.CommandParameters.Count > 1)
                {
                    if (this.CommandParameters[1] == "desc")
                        defaultOrder.Reverse();
                }

                StringBuilder printer = new StringBuilder();
                foreach (var item in defaultOrder)
                {
                    printer.Append(item.Print());
                }
                return printer.ToString();
            }
            else
                return "NO OLYMPIANS ADDED";
        }
    }
}