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

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

        public override string Execute()
        {
            var output = new StringBuilder();

            string key = "firstname";
            string order = "asc";
            if (this.Committee.Olympians.Count == 0)
            {
                return "NO OLYMPIANS ADDED";
            }
            if (this.CommandParameters.Count == 0)
            {
                Console.WriteLine(($"Sorted by [{key}] in [order: {order}]"));
                this.Committee.Olympians.OrderBy(o => o.FirstName);
            }
           else  if (this.CommandParameters.Count == 1)
            {
                if (this.CommandParameters[0] == "firstname" || this.CommandParameters[0] == "lastname" || this.CommandParameters[0] == "country")
                {
                    key = CommandParameters[0];
                    Console.WriteLine(($"Sorted by [{key}] in [order: {order}]"));
                    if (key == "firstname")
                    {
                        this.Committee.Olympians.OrderBy(o => o.FirstName);
                    }
                    else if (key == "lastname")
                    {
                        this.Committee.Olympians.OrderBy(o => o.LastName);
                    }
                    else
                    {
                        this.Committee.Olympians.OrderBy(o => o.Country);
                    }
                }
                else if (this.CommandParameters[0] == "asc" || this.CommandParameters[0] == "dsc")
                {
                    order = CommandParameters[0];
                    Console.WriteLine(($"Sorted by [{key}] in [order: {order}]"));
                    if (order == "asc")
                    {
                        this.Committee.Olympians.OrderBy(o => o.FirstName);
                    }
                    else
                    {
                        this.Committee.Olympians.OrderByDescending(o => o.FirstName);
                    }
                }
            }
            else if (this.CommandParameters.Count == 2)
            {
                if (this.CommandParameters[0] == "firstname" || this.CommandParameters[0] == "lastname" || this.CommandParameters[0] == "country")
                {
                    key = CommandParameters[0];
                    if (key == "firstname")
                    {
                        this.Committee.Olympians.OrderBy(o => o.FirstName);
                    }
                    else if (key == "lastname")
                    {
                        this.Committee.Olympians.OrderBy(o => o.LastName);
                    }
                    else
                    {
                        this.Committee.Olympians.OrderBy(o => o.Country);
                    }
                }
                if (this.CommandParameters[0] == "asc" || this.CommandParameters[0] == "dsc")
                {
                    order = CommandParameters[0];
                    if (order == "asc")
                    {
                        this.Committee.Olympians.OrderBy(o => o.FirstName);
                    }
                    else
                    {
                        this.Committee.Olympians.OrderByDescending(o => o.FirstName);
                    }
                }
                Console.WriteLine(($"Sorted by [{key}] in [order: {order}]"));

            }
            foreach (var item in Committee.Olympians)
            {
                output.AppendLine(item.Print());
            }
            return output.ToString().Trim();
        }



    }
}