using System;
using System.Collections.Generic;
using Luticate2.Auth.Utils.Business.Utils;
using Luticate2.Auth.Utils.Dbo.Pagination;
using Luticate2.Auth.Utils.Dbo.Result;

namespace Luticate2.Auth.Utils.Business.Pagination
{
    public static class LuOrderByParser
    {
        public static LuResult<LuOrderByDbo> Parse<TDbo>(IEnumerable<string> data, LuExpressionUtils.LuExpressionParserOptions options)
        {
            var orderByDbo = new LuOrderByDbo
            {
                OrderByFields = new List<LuOrderByFieldDbo>()
            };
            foreach (var orderByFieldStr in data)
            {
                var orderByFieldResult = Parse<TDbo>(orderByFieldStr, options);
                if (!orderByFieldResult)
                {
                    return orderByFieldResult.To<LuOrderByDbo>();
                }
                var orderByFieldDbo = orderByFieldResult.Data;

                orderByDbo.OrderByFields.Add(orderByFieldDbo);
            }

            return LuResult<LuOrderByDbo>.Ok(orderByDbo);
        }

        public static LuResult<LuOrderByFieldDbo> Parse<TDbo>(string data, LuExpressionUtils.LuExpressionParserOptions options)
        {
            var orderByFieldDbo = new LuOrderByFieldDbo();
            if (data.EndsWith(":desc", StringComparison.OrdinalIgnoreCase))
            {
                orderByFieldDbo.Asc = false;
                data = data.Substring(0, data.Length - 5);
            }
            else
            {
                orderByFieldDbo.Asc = true;

                if (data.EndsWith(":asc", StringComparison.OrdinalIgnoreCase))
                {
                    data = data.Substring(0, data.Length - 4);
                }
            }

            var completeData = $"(x) => ({data})";
            var expressionResult = LuExpressionUtils.Parse<TDbo, object>(completeData, options);
            if (!expressionResult)
            {
                return expressionResult.To<LuOrderByFieldDbo>();
            }
            orderByFieldDbo.Expression = expressionResult.Data;

            return LuResult<LuOrderByFieldDbo>.Ok(orderByFieldDbo);
        }
    }
}