using System;
using System.Linq.Expressions;
using Luticate2.Auth.Utils.Dbo;
using Luticate2.Auth.Utils.Dbo.Pagination;
using Luticate2.Auth.Utils.Dbo.Result;
using Microsoft.CodeAnalysis.CSharp.Scripting;
using Microsoft.CodeAnalysis.Scripting;

namespace Luticate2.Auth.Utils.Business.Pagination
{
    public class LuFilterParser
    {
        public static LuResult<LuFilterDbo> Parse<T>(string data)
        {
            if (string.IsNullOrWhiteSpace(data))
            {
                return LuResult<LuFilterDbo>.Ok(new LuFilterDbo
                {
                    Expression = null
                });
            }
            var completeData = $"(x) => ({data})";
            try
            {
                var options = ScriptOptions.Default.AddReferences(typeof(LuFilterParser).Assembly, typeof(Expression<>).Assembly);
                var expr = CSharpScript.EvaluateAsync<Expression<Func<T, bool>>>(completeData, options).Result;
                return LuResult<LuFilterDbo>.Ok(new LuFilterDbo
                {
                    Expression = expr
                });
            }
            catch (Exception e)
            {
                return LuResult<LuFilterDbo>.Error(LuStatus.InputError.ToInt(), e, "Failed to parse filter expression");
            }
        }
    }
}