using Microsoft.AspNet.Identity;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Threading.Tasks;
using System.Text.RegularExpressions;

namespace EnVisage.Code.Validation
{
    public class PrevuPasswordValidator : IIdentityValidator<string>
    {
        public int MinimumLength { get; set; }
        public int MaximumLength { get; set; }
        public PrevuPasswordValidator(int minLength, int maxLength)
        {
            MinimumLength = minLength;
            MaximumLength = maxLength;
        }

        public Task<IdentityResult> ValidateAsync(string item)
        {
            if (String.IsNullOrEmpty(item) || item.Length < MinimumLength)
            {
                return Task.FromResult(IdentityResult.Failed(String.Format("Password should be at least of length {0}", MinimumLength)));
            }
            if (!String.IsNullOrEmpty(item) && item.Length > MaximumLength)
            {
                return Task.FromResult(IdentityResult.Failed(String.Format("Password should be maxiimum of length {0}", MaximumLength)));
            }
            string pattern = @"^(?=.{" + (MinimumLength - 1) + "," + (MaximumLength - 1) + "})(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~]).*$";
            if (!Regex.IsMatch(item, pattern))
            {
                return Task.FromResult(IdentityResult.Failed("Password should have at least one lower letter, one upper letter, one numeral and one special character, but it should not start with special character"));
            }
            return Task.FromResult(IdentityResult.Success);
        }
    }
}