using System.Collections.Generic;
using System.Threading.Tasks;
using xCommons.Extensions;
using xIdentityModels.Dtos;

namespace xIds.Providers
{
    public partial class XIdentityManager
    {
        #region Admin Actions ...
        /// <summary>
        /// Retrieve All UnBanned Users Identifiers
        /// </summary>
        /// <param name="userSelectByParam">caller user identifier</param>
        /// <returns>a collection of user identifiers</returns>
        public async Task<ICollection<string>> GetAllUnbanned(
            ICollection<string> userSelectByParam
        )
        {
            //
            var result = new List<string>();
            if (!userSelectByParam.HasChild())
            {
                return result;
            }

            //
            foreach (var uParam in userSelectByParam)
            {
                //
                var destUser = await ValidateUserExistsAndRetrieve(uParam, checkIsBanned: false);
                if (!destUser.IsBanned)
                {
                    result.Add(uParam);
                }
            }

            //
            return result;
        }

        /// <summary>
        /// Get All Banned Users Identifiers
        /// </summary>
        /// <param name="userSelectByParam">caller user identifier</param>
        /// <returns>a collection of user identifiers</returns>
        public async Task<ICollection<string>> GetAllBanned(
            ICollection<string> userSelectByParam
        )
        {
            //
            var result = new List<string>();
            if (!userSelectByParam.HasChild())
            {
                return result;
            }

            //
            foreach (var uParam in userSelectByParam)
            {
                //
                var destUser = await ValidateUserExistsAndRetrieve(uParam, checkIsBanned: false);
                if (destUser.IsBanned)
                {
                    result.Add(uParam);
                }
            }

            //
            return result;
        }

        /// <summary>
        /// Ban a Collection of Users
        /// </summary>
        /// <param name="userSelectByParam">caller user identifier</param>
        /// <param name="model">an instance of <see>XUserNameIdRequest</see> which represents user identifier list to Ban</param>
        /// <returns>a collection of user identifiers</returns>
        public async Task<ICollection<string>> Ban(
            string userSelectByParam,
            XUserNameIdRequest model
        )
        {
            //
            // Validate Args ...
            ValidationProvider.NotEmpty(userSelectByParam);
            ValidationProvider.NotNull(model);
            ValidationProvider.NotZeroChilds(model.Ids);

            //
            var user = await ValidateUserExistsAndRetrieve(
                userSelectByParam,
                forceAdmin: true,
                checkIsBanned: true,
                containDetails: false,
                ignoreDisabledUser: false,
                checkCanLoginPolicies: true
            );

            //
            var result = new List<string>();
            foreach (var uParam in model.Ids)
            {
                //
                var destUser = await ValidateUserExistsAndRetrieve(uParam, checkIsBanned: false);

                //
                var isBanned = destUser.IsBanned;
                if (!isBanned)
                {
                    //
                    destUser.IsBanned = true;

                    //
                    await UpdateUserAsync(
                        user,
                        checkCanLoginPolicies: false,
                        checkIsBanned: false
                    );

                    //
                    result.Add(destUser.Id);
                }
            }

            //
            return result;
        }

        /// <summary>
        /// UnBan a Collection of Users
        /// </summary>
        /// <param name="userSelectByParam">caller user identifier</param>
        /// <param name="model">an instance of <see>XUserNameIdRequest</see> which represents user identifier list to Ban</param>
        /// <returns>a collection of user identifiers</returns>
        public async Task<ICollection<string>> UnBan(
            string userSelectByParam,
            XUserNameIdRequest model
        )
        {
            //
            // Validate Args ...
            ValidationProvider.NotEmpty(userSelectByParam);
            ValidationProvider.NotNull(model);
            ValidationProvider.NotZeroChilds(model.Ids);

            //
            var user = await ValidateUserExistsAndRetrieve(
                userSelectByParam,
                forceAdmin: true,
                checkIsBanned: true,
                containDetails: false,
                ignoreDisabledUser: false,
                checkCanLoginPolicies: true
            );

            //
            var result = new List<string>();
            foreach (var uParam in model.Ids)
            {
                //
                var destUser = await ValidateUserExistsAndRetrieve(uParam, checkIsBanned: false);

                //
                var isBanned = destUser.IsBanned;
                if (isBanned)
                {
                    //
                    destUser.IsBanned = false;

                    //
                    await UpdateUserAsync(
                        user,
                        checkCanLoginPolicies: false,
                        checkIsBanned: false
                    );

                    //
                    result.Add(destUser.Id);
                }
            }

            //
            return result;
        }

        /// <summary>
        /// Detrmines a User is Banned or not
        /// </summary>
        /// <param name="userSelectByParam">caller user identifier</param>
        /// <param name="destUserSelectByParam">destination user identifier which checked is banned or not</param>
        /// <returns>a boolean value which represent user banned or not</returns>
        public async Task<bool> IsBanned(
            string userSelectByParam,
            string destUserSelectByParam
        )
        {
            //
            // Validate Args ...
            ValidationProvider.NotEmpty(
                userSelectByParam,
                destUserSelectByParam
            );

            //
            var user = await ValidateUserExistsAndRetrieve(
                userSelectByParam,
                forceAdmin: false,
                checkIsBanned: true,
                containDetails: false,
                ignoreDisabledUser: false,
                checkCanLoginPolicies: true
            );
            var destUser = await ValidateUserExistsAndRetrieve(destUserSelectByParam, checkIsBanned: false);

            //
            var result = destUser.IsBanned;

            //
            return result;
        }
        #endregion                
    }
}