using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Http.ModelBinding;

namespace BuddyFinance.WebApi.Extensions
{
    /// <summary>
    /// Model State Extensions
    /// </summary>
    public static class ModelStateExtensions
    {
        /// <summary>
        /// Gets ModelState Errors
        /// </summary>
        /// <param name="modelState"></param>
        /// <returns></returns>
        public static string GetValidationErrors(this ModelStateDictionary modelState)
        {
            var errorString = "";

            if (!modelState.IsValid)
            {
                var errorsDictionary = modelState.Where(m => m.Value.Errors.Any())
                                                 .Select(m => new { m.Key, m.Value.Errors });

                foreach (var item in errorsDictionary)
                {
                    foreach (var error in item.Errors)
                    {
                        errorString += $"{item.Key}: {error.ErrorMessage}\n";
                    }
                }
            }

            return errorString;
        }
    }
}