using System.Collections.Generic;
using Luticate2.Auth.Dbo;
using Luticate2.Auth.Dbo.Fields;
using Luticate2.Auth.Dbo.Pagination;
using Luticate2.Auth.Dbo.Result;

namespace Luticate2.Auth.Business.Pagination
{
    public class LuOrderByParser
    {
        public static LuResult<LuOrderByDbo> Parse(string data)
        {
            if (data == null)
            {
                data = "";
            }
            data = data.Trim();
            if (data != "")
            {
                var dbo = new LuOrderByDbo {OrderByFields = new List<LuOrderByFieldDbo>()};
                var fields = data.Split(',');
                foreach (var field in fields)
                {
                    if (field == "")
                    {
                        return LuResult<LuOrderByDbo>.Error(LuStatus.InputError.ToInt(),
                            $"LuOrderByParser: {data}", "Empty order by field");
                    }
                    var orderByField = new LuOrderByFieldDbo();
                    var split = field.Split(':');
                    if (split.Length > 2 || split.Length == 0)
                    {
                        return LuResult<LuOrderByDbo>.Error(LuStatus.InputError.ToInt(),
                            $"LuOrderByParser: {data}", "Invalid order by field syntax");
                    }
                    orderByField.Field = LuFieldDbo.Make(split[0]);
                    var order = split.Length == 2 ? split[1].ToLower() : "asc";
                    if (order == "asc")
                    {
                        orderByField.Asc = true;
                    }
                    else if (order == "desc")
                    {
                        orderByField.Asc = false;
                    }
                    else
                    {
                        return LuResult<LuOrderByDbo>.Error(LuStatus.InputError.ToInt(),
                            $"LuOrderByParser: {data}", "Empty order by field order");
                    }
                    dbo.OrderByFields.Add(orderByField);
                }
                return LuResult<LuOrderByDbo>.Ok(dbo);
            }
            return LuResult<LuOrderByDbo>.Error(LuStatus.InputError.ToInt(), "Order by is empty or missing", "");
        }
    }
}