using System.Collections.Generic;
using xCommons.Extensions;
using xExceptions.Constants;
using xIdentityModels.Constants;
using xIdentityModels.Models;

namespace xIdentityModels.Extensions {
    public static class XIdentityExtensions {
        public static XUserSelectBy GetUserSelectByType (
            this string source,
            bool forceUserSelectByParamNotEmpty = true,
            bool forceUserSelectByTypeMustSpecified = false
        ) {
            //
            // Validate Args ...
            if (source.IsNullOrEmpty () &&
                forceUserSelectByParamNotEmpty) {
                XException.InvalidArgs.Throw ();
            }

            //
            var result = XUserSelectBy.NotSpecified;
            var userSelectByParam = source.ToNormalString ();
            if (userSelectByParam.IsValidEmail ()) {
                //
                // Find User by Email ...
                result = XUserSelectBy.Email;
            } else if (userSelectByParam.IsValidMobileNumber ()) {
                //
                // Find User by Mobile Number ...
                result = XUserSelectBy.MobileNumber;
            } else if (userSelectByParam.IsGuid ()) {
                //
                // Find User By it's ID ...
                result = XUserSelectBy.ID;
            } else {
                //
                // UserName ...
                result = XUserSelectBy.Username;
            }

            //
            // Validation Result ...
            if (forceUserSelectByTypeMustSpecified &&
                result == XUserSelectBy.NotSpecified) {
                XException.InvalidData.Throw ();
            }

            //
            return result;
        }

        public static string GetUserSelectByParam (
            this XActionRequest source,
            bool forceNotNull = true,
            ICollection<XUserSelectBy> excludes = null
        ) {
            //
            // Validate Args ...
            if (source.IsNull ()) {
                XException.InvalidArgs.Throw ();
            }

            //
            var id = source.UserId;
            var userName = source.UserName;
            var email = source.Email;
            var phoneNumber = source.MobileNumber;

            //
            if (excludes != null) {
                //
                if (excludes.Contains (XUserSelectBy.ID)) {
                    id = null;
                }
                if (excludes.Contains (XUserSelectBy.Email)) {
                    email = null;
                }
                if (excludes.Contains (XUserSelectBy.MobileNumber)) {
                    phoneNumber = null;
                }
                if (excludes.Contains (XUserSelectBy.Username)) {
                    userName = null;
                }
            }

            //
            var selectByParam =
                id.IsNullOrEmpty () ?
                userName.IsNullOrEmpty () ?
                email.IsNullOrEmpty () ?
                phoneNumber.IsNullOrEmpty () ? null : phoneNumber : email : userName : id;

            //
            // Check result ...
            if (forceNotNull &&
                selectByParam.IsNullOrEmpty ()) {
                XException.InvalidData.Throw ();
            }

            //
            return selectByParam;
        }
    }
}