using NoticeBoard.Data;
using Microsoft.EntityFrameworkCore;

namespace NoticeBoard.Routing;

public class DeviceSlugConstraint : IRouteConstraint
{
    // Reserved paths that should NOT be treated as device slugs
    private static readonly HashSet<string> ReservedPaths = new(StringComparer.OrdinalIgnoreCase)
    {
        "admin", "api", "d", "error", "css", "js", "lib", "uploads", "favicon.ico"
    };

    public bool Match(HttpContext? httpContext, IRouter? route, string routeKey,
        RouteValueDictionary values, RouteDirection routeDirection)
    {
        if (values.TryGetValue(routeKey, out var value) && value is string slug)
        {
            // Block reserved paths
            if (ReservedPaths.Contains(slug))
                return false;

            // Only match lowercase alphanumeric + hyphens
            return slug.All(c => char.IsLetterOrDigit(c) || c == '-');
        }
        return false;
    }
}