using Core;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Client
{
	delegate void InvokedMethod();

	public partial class RoomListForm : Form
	{
		public RoomListForm()
		{
			InitializeComponent();
			InitInstance();
		}

		private void InitInstance()
		{
			Singleton.Instance.CreateRoomResponsed += CreateRoomResponsed;
			Singleton.Instance.RoomListResponsed += RoomListResponsed;
			Singleton.Instance.EnterRoomResponsed += EnterRoomResponsed;
		}

		private async void btnEnter_Click(object sender, EventArgs e)
		{
			if (lbxRoom.SelectedItem == null)
			{
				MessageBox.Show("Please select a room.");
				return;
			}

			EnterRoomRequestPacket packet = new EnterRoomRequestPacket(lbxRoom.SelectedItem.ToString());
			await Singleton.Instance.SendAsync(packet.Serialize(), SocketFlags.None);
		}

		private async void btnCreate_Click(object sender, EventArgs e)
		{
			string roomName = tbxRoomName.Text;
			if (string.IsNullOrEmpty(roomName))
			{
				MessageBox.Show("Please input a room name.");
				return;
			}

			CreateRoomRequestPacket packet = new CreateRoomRequestPacket(roomName);
			await Singleton.Instance.SendAsync(packet.Serialize(), SocketFlags.None);
		}

		private void RoomListForm_Activated(object sender, EventArgs e)
		{
			btnRefresh_Click(sender, e);
		}

		private void InvokeMethod(InvokedMethod method)
		{
			if (this.InvokeRequired)
			{
				this.Invoke(new MethodInvoker(() =>
				{
					method();
				}));
			}
			else
			{
				method();
			}
		}

		private void CreateRoomResponsed(object? sender, EventArgs e)
		{
			if (sender == null)
				return;

			CreateRoomResponsePacket packet = (CreateRoomResponsePacket)sender;
			if (packet.Code == StatusCode.Success)
			{
				string roomName = tbxRoomName.Text;
				InvokeMethod(() =>
				{
					lbxRoom.Items.Add(roomName);
					tbxRoomName.Text = "";
				});

				IAsyncResult ar = null;
				ar = BeginInvoke(() =>
				{
					ChatRoomForm chatRoomForm = new ChatRoomForm();
					chatRoomForm.Text = roomName;
					chatRoomForm.ShowDialog();
					EndInvoke(ar);
				});
			}
		}

		private void RoomListResponsed(object? sender, EventArgs e)
		{
			if (sender == null)
				return;

			RoomListResponsePacket packet = (RoomListResponsePacket)sender;
			InvokeMethod(() =>
			{
				foreach (string item in packet.RoomNames)
				{
					lbxRoom.Items.Add(item);
				}
			});
		}

		private void EnterRoomResponsed(object? sender, EventArgs e)
		{
			if (sender == null)
				return;

			EnterRoomResponsePacket packet = (EnterRoomResponsePacket)sender;
			InvokeMethod(() =>
			{
				IAsyncResult ar = null;
				ar = BeginInvoke(() =>
				{
					ChatRoomForm chatRoomForm = new ChatRoomForm();
					chatRoomForm.Text = lbxRoom.SelectedItem.ToString();
					chatRoomForm.ShowDialog();
					EndInvoke(ar);
				});
			});
		}

		private async void btnRefresh_Click(object sender, EventArgs e)
		{
			lbxRoom.Items.Clear();
			RoomListRequestPacket packet = new RoomListRequestPacket();
			await Singleton.Instance.SendAsync(packet.Serialize(), SocketFlags.None);
		}

		private void RoomListForm_FormClosing(object sender, FormClosingEventArgs e)
		{
			Singleton.Instance.CreateRoomResponsed -= CreateRoomResponsed;
			Singleton.Instance.RoomListResponsed -= RoomListResponsed;
			Singleton.Instance.EnterRoomResponsed -= EnterRoomResponsed;

			Singleton.Instance.Socket.Shutdown(SocketShutdown.Send);
		}
	}
}