using System.Text.RegularExpressions;
using SpacetimeDB;

public static partial class Module
{
    [Table(Name = "User", Public = true)]
    public partial class User
    {
        [PrimaryKey]
        public Identity Identity;
        public string? Name;
        public string? Color;
        public bool Online;
    }

    /// Takes a name and checks if it's acceptable as a user's name.
    private static string ValidateName(string name)
    {
        if (string.IsNullOrEmpty(name))
        {
            throw new Exception("Names must not be empty");
        }
        return name;
    }

    [Reducer]
    public static void SetName(ReducerContext ctx, string name)
    {
        name = ValidateName(name);

        var user = ctx.Db.User.Identity.Find(ctx.Sender);
        if (user is not null)
        {
            user.Name = name;
            ctx.Db.User.Identity.Update(user);
        }
    }

    private static string ValidateColor(string color)
    {
        var regex = new Regex("^([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$");
        if (!regex.IsMatch(color))
        {
            throw new Exception("Invalid color code");
        }
        return color;
    }

    [Reducer]
    public static void SetColor(ReducerContext ctx, string color)
    {
        color = ValidateColor(color);

        var user = ctx.Db.User.Identity.Find(ctx.Sender);
        if (user is not null)
        {
            user.Color = color;
            ctx.Db.User.Identity.Update(user);
        }
    }
}