using Godot;
using SpacetimeDB;
using SpacetimeDB.Types;

public partial class ChatLog : RichTextLabel
{
    const string SystemColor = "#747474";

    public override void _EnterTree()
    {
        ClearLog();
    }

    public override void _Ready()
    {
        DbConnection conn = Spacetime.Instance.Connection;
        RegisterSubscriptions(conn);
    }

    string UserNameOrIdentity(User user)
    {
        return user != null ? user.Name ?? user.Identity.ToString()[..8] : "unknown";
    }

    void PushMessage(string name, string message, string color)
    {
        string entry = $"[color={color}]{name}:[/color] {message}";
        this.Text += $"{entry}\n";
    }

    void ClearLog()
    {
        Text = "";
    }

    void RegisterSubscriptions(DbConnection conn)
    {
        conn.Db.User.OnInsert += User_OnInsert;
        conn.Db.User.OnUpdate += User_OnUpdate;

        conn.Db.Message.OnInsert += Message_OnInsert;
    }

    void User_OnInsert(EventContext ctx, User insertedValue)
    {
        if (ctx.Event is Event<Reducer>.SubscribeApplied)
        {
            return;
        }
        PushMessage("System", $"{UserNameOrIdentity(insertedValue)} connected", SystemColor);
    }

    void User_OnUpdate(EventContext ctx, User oldValue, User newValue)
    {
        if (oldValue.Name != newValue.Name)
        {
            PushMessage(
                "System",
                $"{UserNameOrIdentity(oldValue)} renamed to {UserNameOrIdentity(newValue)}",
                SystemColor
            );
        }
        if (oldValue.Online != newValue.Online)
        {
            if (newValue.Online)
            {
                PushMessage("System", $"{UserNameOrIdentity(newValue)} connected", SystemColor);
            }
            else
            {
                PushMessage("System", $"{UserNameOrIdentity(newValue)} disconnected", SystemColor);
            }
        }
    }

    void Message_OnInsert(EventContext ctx, Message insertedValue)
    {
        User sender = ctx.Db.User.Identity.Find(insertedValue.Sender);
        string color = sender.Identity.Equals(Spacetime.Instance.Identity) ? "blue" : "red";
        if (ctx.Event is Event<Reducer>.SubscribeApplied)
        {
            PushMessage(UserNameOrIdentity(sender), insertedValue.Text, color);
            return;
        }
        PushMessage(UserNameOrIdentity(sender), insertedValue.Text, color);
    }
}