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

public class Engine
{
    private bool isRunning;
    private DungeonMaster dungeonMaster;
    private IReader reader;
    private IWriter writer;

    public Engine(IReader reader, IWriter writer)
    {
        this.dungeonMaster = new DungeonMaster();
        this.reader = reader;
        this.writer = writer;
    }

    public void Run()
    {
        this.isRunning = true;

        while (this.isRunning)
        {
            List<string> inputArgs = reader.ReadLine().Split().ToList();
            var command = inputArgs[0];

            if (string.IsNullOrEmpty(command))
            {
                this.isRunning = false;
                return;
            }

            var args = inputArgs.Skip(1).ToArray();
            try
            {
                switch (command)
                {
                    case "JoinParty":
                        writer.WriteLine(dungeonMaster.JoinParty(args));
                        break;
                    case "AddItemToPool":
                        writer.WriteLine(dungeonMaster.AddItemToPool(args));
                        break;
                    case "PickUpItem":
                        writer.WriteLine(dungeonMaster.PickUpItem(args));
                        break;
                    case "UseItem":
                        writer.WriteLine(dungeonMaster.UseItem(args));
                        break;
                    case "UseItemOn":
                        writer.WriteLine(dungeonMaster.UseItemOn(args));
                        break;
                    case "GiveCharacterItem":
                        writer.WriteLine(dungeonMaster.GiveCharacterItem(args));
                        break;
                    case "GetStats":
                        writer.WriteLine(dungeonMaster.GetStats());
                        break;
                    case "Attack":
                        writer.WriteLine(dungeonMaster.Attack(args));
                        break;
                    case "Heal":
                        writer.WriteLine(dungeonMaster.Heal(args));
                        break;
                    case "EndTurn":
                        writer.WriteLine(dungeonMaster.EndTurn(args));
                        break;
                }
            }
            catch (System.ArgumentException e)
            {
                this.writer.WriteLine("Parameter Error: " + e.Message);
            }
            catch (System.InvalidOperationException e)
            {
                this.writer.WriteLine("Invalid Operation: " + e.Message);
            }

            if (this.dungeonMaster.IsGameOver() || this.isRunning == false)
            {
                this.writer.WriteLine("Final stats:");
                this.writer.WriteLine(this.dungeonMaster.GetStats());
                this.isRunning = false;
            }
        }
    }
}