using xStringService.Interfaces.Entities;
using xServices.TermsConditions.Interfaces;
using System.Threading.Tasks;
using xCommons.Extensions;
using xCommons.Configurations;
using xStringService.Models.Entities;
using xExceptions.Constants;
using xIdentityModels.Models;
using System.Linq;
using Microsoft.AspNetCore.SignalR;
using xServices.TermsConditions.Push;
using System.Collections.Generic;
using xPushService.Constants;

namespace xServices.TermsConditions.Provides
{
    public class XTermsComditionsProvider : IXTermsComditionsProvider
    {
        //
        #region Props ...
        private readonly string termsId;
        private readonly IHubContext<XTermsHub> hub;
        private readonly XAppConfiguration appConfiguration;
        private readonly IXStringRepository stringRepository;
        #endregion

        //
        #region Constructor ...
        public XTermsComditionsProvider(
            XAppConfiguration appConfiguration,
            IXStringRepository stringRepository,
            IHubContext<XTermsHub> hub = null,
            string termsId = "terms"
        )
        {
            //
            this.termsId = termsId;
            this.stringRepository = stringRepository;
            this.hub = hub;
            this.appConfiguration = appConfiguration;
        }
        #endregion

        //
        #region Actions ...
        /// <summary>
        /// Retrieved all Exists Languages Terms and Conditions ...
        /// </summary>
        /// <returns></returns>
        public async Task<IEnumerable<string>> TermsLanguages()
        {
            //
            var result = (await stringRepository
                .FindManyAsync(x => x.ResourceTitle == termsId))
                .Select(x => x.Language);
            return result;
        }

        /// <summary>
        /// Check Has Terms and Conditions based on Specified Language ...
        /// </summary>
        /// <param name="language">if null, used Default Language ...</param>
        /// <returns></returns>
        public async Task<bool> HasTerms(string language = null)
        {
            //
            // Normalize ...
            if (language.IsNullOrEmpty())
            {
                language = appConfiguration.DefaultLanguage;
            }

            //
            var result = !(await GetString(language: language))
                .IsNullOrDefault();

            //
            return result;
        }

        /// <summary>
        /// Retrieve Terms and Conditions for Specified Language ...
        /// </summary>
        /// <param name="language">if null, used Default Language ...</param>
        /// <returns></returns>
        public async Task<string> GetTerms(string language = null)
        {
            //
            var result = string.Empty;
            var entity = await GetString(language: language);

            //
            if (!entity.IsNullOrDefault())
            {
                result = entity.TranslatedValue;
            }

            //
            return result;
        }

        /// <summary>
        /// Add Terms and Conditions for Specified Language ...
        /// </summary>
        /// <param name="language"></param>
        /// <param name="terms"></param>
        /// <param name="userInfo"></param>
        /// <param name="connectionId"></param>
        /// <returns></returns>
        public async Task<string> AddTerms(
            string language,
            string terms,
            XUserClaimsInfoDto userInfo = null,
            string connectionId = null
        )
        {
            //
            // Validate ...
            var isValid =
                !language.IsNullOrEmpty() &&
                !terms.IsNullOrEmpty() &&
                !userInfo.IsNullOrDefault() &&
                language != appConfiguration.DefaultLanguage;
            if (!isValid)
            {
                XException.InvalidArgs.Throw();
            }

            //
            // Check Exists ...
            isValid = await HasTerms(language: language);
            if (isValid)
            {
                XException.Duplicate.Throw();
            }

            //
            // Check Permission ...
            isValid =
                !userInfo.IsNullOrDefault() &&
                userInfo.Roles.Any(r => r.ToNormalString().Contains("admin"));
            if (!isValid)
            {
                XException.NotAllowed.Throw();
            }

            //
            // Add Terms ...
            XString entity = null;
            try
            {
                //
                entity = new XString
                {
                    Language = language,
                    ResourceTitle = termsId,
                    TranslatedValue = terms,
                };
                entity = await stringRepository.AddAsync(entity);
            }
            catch { }

            //
            var result = string.Empty;
            if (!entity.IsNullOrDefault())
            {
                result = entity.TranslatedValue;
            }

            //
            if (!result.IsNullOrEmpty())
            {
                //
                await SendPush(
                    action: XBaseEntityHubAction.Add.GetStringValue(),
                    payLoad: entity.ToJSON(camelCase: true),
                    connectionId: connectionId
                );
            }

            //
            return result;
        }

        /// <summary>
        /// Remove Terms and Conditions of Specified Language ...
        /// </summary>
        /// <param name="language"></param>
        /// <param name="userInfo"></param>
        /// <param name="userInfo"></param>
        /// <param name="connectionId"></param>
        /// <returns></returns>
        public async Task<bool> RemoveTerms(
            string language,
            XUserClaimsInfoDto userInfo = null,
            string connectionId = null
        )
        {
            //
            var isValid =
                !language.IsNullOrEmpty() &&
                !userInfo.IsNullOrDefault() &&
                language != appConfiguration.DefaultLanguage;
            if (!isValid)
            {
                XException.InvalidArgs.Throw();
            }

            //
            // Check Exists ...
            XString entity = await GetString(language);
            isValid = !entity.IsNullOrDefault();
            if (!isValid)
            {
                XException.NotFound.Throw();
            }

            //
            // Check Permission ...
            isValid =
                !userInfo.IsNullOrDefault() &&
                userInfo.Roles.Any(r => r.ToNormalString().Contains("admin"));
            if (!isValid)
            {
                XException.NotAllowed.Throw();
            }

            //
            try
            {
                entity = await stringRepository.RemoveAsync(entity.Id);
            }
            catch
            {
                entity = null;
            }

            //
            var result = !entity.IsNullOrDefault();
            if (result)
            {
                //
                await SendPush(
                    action: XBaseEntityHubAction.Delete.GetStringValue(),
                    payLoad: entity.ToJSON(camelCase: true),
                    connectionId: connectionId
                );
            }

            //
            return result;
        }

        /// <summary>
        /// Update Terms and Conditions of Specified Language ...
        /// </summary>
        /// <param name="language"></param>
        /// <param name="terms"></param>
        /// <param name="userInfo"></param>
        /// <param name="connectionId"></param>
        /// <returns></returns>
        public async Task<bool> UpdateTerms(
            string language,
            string terms,
            XUserClaimsInfoDto userInfo = null,
            string connectionId = null
        )
        {
            //
            var isValid =
                !terms.IsNullOrEmpty() &&
                !language.IsNullOrEmpty() &&
                !userInfo.IsNullOrDefault();
            if (!isValid)
            {
                XException.InvalidArgs.Throw();
            }

            //
            // Check Exists ...
            XString entity = await GetString(language);
            isValid = !entity.IsNullOrDefault();
            if (!isValid)
            {
                XException.NotFound.Throw();
            }

            //
            // Check Permission ...
            isValid =
                !userInfo.IsNullOrDefault() &&
                userInfo.Roles.Any(r => r.ToNormalString().Contains("admin"));
            if (!isValid)
            {
                XException.NotAllowed.Throw();
            }

            // 
            try
            {
                //
                entity.TranslatedValue = terms;
                entity = await stringRepository.UpdateAsync(entity.Id, entity);
            }
            catch
            {
                entity = null;
            }

            //
            var result = !entity.IsNullOrDefault();
            if (result)
            {
                //
                await SendPush(
                    action: XBaseEntityHubAction.Update.GetStringValue(),
                    payLoad: entity.ToJSON(camelCase: true),
                    connectionId: connectionId
                );
            }

            //
            return result;
        }
        #endregion

        //
        #region Hub Actions ...
        /// <summary>
        /// Send Custom Push Message ...
        /// </summary>
        /// <param name="action"></param>
        /// <param name="payLoad"></param>
        /// <param name="connectionId"></param>
        /// <returns></returns>
        public async Task SendPush(
            string action,
            string payLoad,
            string connectionId = null
        )
        {
            //
            var actions = new List<string>
            {
                XBaseEntityHubAction.Add.GetStringValue(),
                XBaseEntityHubAction.Update.GetStringValue(),
                XBaseEntityHubAction.Delete.GetStringValue(),
            };

            //
            // Validate ...
            var isValid =
                !hub.IsNull() &&
                !action.IsNullOrEmpty() &&
                actions.Contains(action);
            if (!isValid)
            {
                return;
            }

            //
            var clients = hub.Clients.All;
            if (!connectionId.IsNullOrEmpty())
            {
                clients = hub.Clients.AllExcept(connectionId);
            }
            try
            {
                await clients.SendAsync(action, payLoad, connectionId);
            }
            catch { }
        }
        #endregion

        //
        #region Private ...
        /// <summary>
        /// Retrieve Terms and Conditions XString Entity ...
        /// </summary>
        /// <param name="language"></param>
        /// <returns></returns>
        private async Task<XString> GetString(string language = null)
        {
            //
            // Normalize ...
            if (language.IsNullOrEmpty())
            {
                language = appConfiguration.DefaultLanguage;
            }

            //
            // Retrieve ...
            XString result = null;
            try
            {
                //
                result = await stringRepository.FindOneAsync(x =>
                    x.Language == language &&
                    x.ResourceTitle == this.termsId
                );
            }
            catch
            {
            }

            //
            return result;
        }
        #endregion
    }
}