using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using Landmark.OLA.Application.Controllers;
using Landmark.OLA.Models.Core;

namespace Landmark.OLA.Application.Services
{
    public class CoreAccessService
    {
        public CoreMemberOwner FindMatchingOwner(OnlineIdentityFormData document, List<CoreMemberOwner> owners)
        {
            if (owners != null && owners.Count != 0 && document != null)
            {
                foreach (var owner in owners)
                {
                    if (DoesOwnerMatch(owner, document))
                    {
                        return owner;
                    }
                }
            }

            return null;
        }

        // Expects birthdate in form YYYY-MM-DD and taxid in form ###-##-####
        // Expects dob in form MM/DD/YYYY and ssn in form #### (last 4)
        // Tries to match this owner and this document.
        public bool DoesOwnerMatch(CoreMemberOwner owner, OnlineIdentityFormData document)
        {
            if (string.IsNullOrEmpty(owner.BirthDate) || owner.TaxId == null || owner.TaxId.Length != 11)
            {
                return false;
            }
            if (owner.TaxId.Substring(7) != document.SocialSecurityNumber)
            {
                return false;
            }
            string[] formats = { "MM/dd/yyyy", "yyyy-MM-dd" };
            var dobEntered = DateTime.ParseExact(document.DateOfBirth, formats, new CultureInfo("en-US"), DateTimeStyles.None);
            var dobDesired = DateTime.ParseExact(owner.BirthDate, formats, new CultureInfo("en-US"), DateTimeStyles.None);
            return dobEntered == dobDesired;
        }
    }
}