@using System;
@using Sandbox.UI;
@namespace Sandbox
@inherits PanelComponent
@implements Component.INetworkListener
<root>

	<div class="output">
		@foreach (var entry in Entries)
		{
			<div class="chat_entry"> 
				@if (entry.steamid > 0)
				{
					<div class="avatar" style="background-image: url( avatar:@entry.steamid )"></div>
				}
				<div class="author">@entry.author</div>
				<div class="message">@entry.message</div>
			</div>
		}
	</div>

	<div class="input">
		<TextEntry @ref="InputBox" onsubmit="@ChatFinished"></TextEntry>
	</div>

</root>

@code
{

	public static Chat Instance;
	public Chat() => Instance = this;
	public static bool IsActive => Instance.InputBox.HasFocus;

	public static void Open()
	{
		Instance.InputBox.Focus();
	}

	public static void AddText(string text)
	{
		Instance.AddTextInternal(text);
	}

	public event Action<string> OnChat;
	public TextEntry InputBox;

	public record Entry(ulong steamid, string author, string message, RealTimeSince timeSinceAdded);
	List<Entry> Entries = new();

	protected override void OnUpdate()
	{
		if (InputBox is null)
			return;

		Panel.AcceptsFocus = false;

		if (Input.Pressed("chat"))
			Open();

		if (Entries.RemoveAll(x => x.timeSinceAdded > 20.0f) > 0)
		{
			StateHasChanged();
		}

		if (InputBox.HasFocus && Input.EscapePressed)
		{
			Input.EscapePressed = false;
			ChatClosed();
		}

		SetClass("open", InputBox.HasFocus);
	}

	void ChatFinished()
	{
		var text = InputBox.Text;
		Mouse.Visibility = MouseVisibility.Auto;

		OnChat?.Invoke(text);
		OnChat = null;
		if (string.IsNullOrWhiteSpace(text))
			return;

		AddTextInternal(InputBox.Text);
		InputBox.Text = "";
	}

	void ChatClosed()
	{
		var text = InputBox.Text;
		InputBox.Text = "";
		OnChat = null;
	}

	[Rpc.Broadcast]
	public void AddTextInternal(string message)
	{
		message = message.Truncate(300);

		if (string.IsNullOrWhiteSpace(message))
			return;

		var author = Rpc.Caller.DisplayName;
		var steamid = Rpc.Caller.SteamId;

		Log.Info($"{author}: {message}");

		Entries.Add(new Entry(steamid, author, message, 0.0f));
		StateHasChanged();
	}

	[Rpc.Broadcast]
	void AddSystemText(string message)
	{
		message = message.Truncate(300);

		if (string.IsNullOrWhiteSpace(message))
			return;

		Entries.Add(new Entry(0, "ℹ️", message, 0.0f));
		StateHasChanged();
	}

	void Component.INetworkListener.OnConnected(Connection channel)
	{
		if (IsProxy) return;

		AddSystemText($"{channel.DisplayName} has joined the game");
	}

	void Component.INetworkListener.OnDisconnected(Connection channel)
	{
		if (IsProxy) return;

		AddSystemText($"{channel.DisplayName} has left the game");
	}
}