using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel.DataAnnotations;
using System.Web.Mvc;
using System.Globalization;
using Bowin.Common.JSON;

namespace EMIS.ViewModel
{
    public class TotalLengthAttribute : ValidationAttribute, IClientValidatable
    {
        public int Length { get; set; }
        public IList<string> RelateControls { get; set; }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="length"></param>
        /// <param name="relateControls"></param>
        public TotalLengthAttribute(int length, params string[] relateControls)
        {
            this.Length = length;
            if (relateControls == null)
            {
                RelateControls = new List<string>();
            }
            else
            {
                RelateControls = relateControls.ToList();
            }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="value"></param>
        /// <param name="validationContext"></param>
        /// <returns></returns>
        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            string totalString = "";
            List<string> errorMessage = new List<string>();
            foreach (var relateControl in RelateControls)
            {
                var property = validationContext.ObjectType.GetProperty(relateControl);
                if (property == null)
                {
                    errorMessage.Add(string.Format(CultureInfo.CurrentCulture, "{0} 不存在", relateControl));
                    continue;
                }

                //获取属性的值
                var otherValue = property.GetValue(validationContext.ObjectInstance, null);
                totalString += Convert.ToString(otherValue);
            }
            if (errorMessage.Count > 0)
            {
                return new ValidationResult(string.Join(",", errorMessage));
            }
            if (totalString.Length != this.Length)
            {
                return new ValidationResult(FormatErrorMessage(validationContext.DisplayName));
            }
            return null;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="metadata"></param>
        /// <param name="context"></param>
        /// <returns></returns>
        public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
        {
            var rule = new ModelClientValidationRule
            {
                ValidationType = "totallength",
                ErrorMessage = FormatErrorMessage(metadata.GetDisplayName())
            };
            rule.ValidationParameters["length"] = Length;
            rule.ValidationParameters["other"] = RelateControls.ToJson();
            yield return rule;

        }

    }
}