using CollabVMSharp;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CollabVMClient.ViewModels
{
    internal class UserListViewModel : ViewModelBase
    {
        public ObservableCollection<UserViewModel> Users { get; } = new ObservableCollection<UserViewModel>();
        private string id;
        public string Title => $"CollabVM - Users ({id})";

        public UserListViewModel(string id)
        {
            this.id = id;
        }

        public void AddUser(string username, Rank rank)
        {
            // Needed if a user ranks up
            RemoveUser(username);
            Users.Add(new UserViewModel(username, rank));
        }

        public void RenameUser(string username, string newName)
        {
            var user = Users.First(u =>  u.Username == username);
            user.Rename(newName);
        }
        
        public void RemoveUser(string username)
        {
            UserViewModel user;
            try
            {
               user = Users.First(u => u.Username == username);
            } catch (InvalidOperationException ex)
            {
                // just ignore it
                return;
            }
            Users.Remove(user);
        }

        public void ParseTurnUpdate(TurnUpdateEventArgs e)
        {
            foreach (var user in Users)
            {
                user.SetTurnStatus(TurnStatus.None);
            }
            if (e.Queue.Length == 0) return;
            var currentTurningUser = Users.First(u => u.Username == e.Queue[0].Username);
            currentTurningUser.SetTurnStatus(TurnStatus.HasTurn);
            for (int i = 1; i < e.Queue.Length; i++) { 
                var user = Users.First(u => u.Username == e.Queue[i].Username);
                user.SetTurnStatus(TurnStatus.Waiting);
            }
            var newUsers = Users.OrderByDescending(i => GetSortIndex(i, e.Queue)).ToArray();
            Users.Clear();
            foreach (UserViewModel u in newUsers)
            {
                Users.Add(u);
            }
        }
        
        public int GetSortIndex(UserViewModel u, User[] queue)
        {
            int i = Array.FindIndex(queue, x => x.Username == u.Username);
            if (i == -1) return -1;
            else return queue.Length - i;
        }
    }
}