using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using xCategoryService.Interfaces;
using xCategoryService.Interfaces.Dtos;
using xCategoryService.Models.Dtos;
using xCategoryService.Models.Entities;
using xCategoryService.Providers.Dtos;
using xCommons.Configurations;
using xCommons.Extensions;
using xExceptions.Constants;
using xIdentityModels.Models;
using xModels.Dtos;
using xPushService.Constants;
using xPushService.Providers;

namespace xCategoryService.Providers
{
    public class XCategoryProvider : XBaseProvided<XCategory, XCategoryDto, int, XCategoryDtoHub>, IXCategoryProvider
    {
        private readonly IXCategoryServiceProvider provider;
        private readonly XAppConfiguration appConfiguration;
        private readonly IXCategoryTitleResourceProvider titleResourceProvider;
        private readonly IXCategoryDescriptionResourceProvider descriptionResourceProvider;

        public XCategoryProvider(
            XAppConfiguration appConfiguration,
            IXCategoryServiceProvider provider,
            IXCategoryTitleResourceProvider titleResourceProvider,
            IXCategoryDescriptionResourceProvider descriptionResourceProvider
        ) : base(
            provider,
            permittedRoles: new string[] { }
        )
        {
            //
            this.provider = provider;
            this.appConfiguration = appConfiguration;
            this.titleResourceProvider = titleResourceProvider;
            this.descriptionResourceProvider = descriptionResourceProvider;
        }

        public override bool IsOwned(
            XCategoryDto item,
            XUserClaimsInfoDto userInfo
        )
        {
            return !item.IsNullOrDefault();
        }

        public override bool IsOwned(
            XCategory item,
            XUserClaimsInfoDto userInfo
        )
        {
            return !item.IsNullOrDefault();
        }

        /// <summary>
        /// Check a Category Has Specified Locale or not ...
        /// </summary>
        /// <param name="id"></param>
        /// <param name="language"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<bool> HasLocale(
            int id,
            string language,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Validate ...
            var isValid =
                id.IsValidIntId() &&
                !language.IsNullOrEmpty();
            if (isValid)
            {
                XException.InvalidArgs.Throw();
            }

            //
            // Retrieve Resource ...
            var resource = await GetResource(
                id: id,
                cancellationToken: cancellationToken
            );

            //
            // Check Result ...
            var result =
                !resource.IsNullOrDefault() &&
                resource.Titles.Locales
                    .Any(x => x.Language
                        .Equals(language, System.StringComparison.InvariantCultureIgnoreCase)) &&
                resource.Descriptions.Locales
                    .Any(x => x.Language
                        .Equals(language, System.StringComparison.InvariantCultureIgnoreCase));

            //
            return result;
        }

        /// <summary>
        /// Load an Item by all of it's Related Translations ...
        /// </summary>
        /// <param name="id"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<XCategoryResourceDto> GetResource(
            int id,
            CancellationToken cancellationToken = default
        )
        {
            //
            var category = await Get(
                id: id,
                includeBuilder: null,
                cancellationToken: cancellationToken
            );
            var titleResource = await titleResourceProvider.GetResource(
                identifier: id,
                cancellationToken: cancellationToken
            );
            var descriptionResource = await titleResourceProvider.GetResource(
                identifier: id,
                cancellationToken: cancellationToken
            );

            //
            var result = new XCategoryResourceDto
            {
                Item = category,
                Titles = titleResource,
                Descriptions = descriptionResource
            };

            //
            return result;
        }

        /// <summary>
        /// Add Category Item for Specified Language ...
        /// </summary>
        /// <param name="item"></param>
        /// <param name="langauge"></param>
        /// <param name="connectionId"></param>
        /// <param name="userInfo"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>        
        public async Task<XCategoryResourceDto> Add(
            XCategoryDto item,
            string langauge = null,
            string connectionId = null,
            XUserClaimsInfoDto userInfo = null,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Normalize ...
            langauge =
                !langauge.IsNullOrEmpty()
                    ? langauge
                    : appConfiguration.DefaultLanguage;

            //
            // Validate ...
            var isValid = !item.IsNullOrDefault();
            if (!isValid)
            {
                XException.InvalidArgs.Throw();
            }

            //
            var id = -1;
            try
            {
                //
                var title = item.Title;
                var description = item.Description;

                //
                // Add Item Pure for ID Generating ...
                item = await base.Add(
                    item: item,
                    userInfo: userInfo,
                    connectionId: null, // Since here We dont want notification ...
                    cancellationToken: cancellationToken
                );
                isValid = !item.IsNullOrDefault();
                if (!isValid)
                {
                    XException.ActionFailed.Throw();
                }

                //
                id = item.Id;
                var titleResource = await titleResourceProvider
                    .AddOrUpdateLocale(
                        identifier: id,
                        locale: new XLocaleResourceDto
                        {
                            Value = title,
                            Language = langauge
                        },
                        connectionId: connectionId,
                        cancellationToken: cancellationToken
                    );
                var descriptionResource = await descriptionResourceProvider
                    .AddOrUpdateLocale(
                        identifier: id,
                        locale: new XLocaleResourceDto
                        {
                            Value = description,
                            Language = langauge
                        },
                        connectionId: connectionId,
                        cancellationToken: cancellationToken
                    );

                //
                // Update Category Dto ...
                item.Title = titleResource.Resource;
                item.Description = descriptionResource.Resource;
                item = await base.Update(
                    id: id,
                    item: item,
                    userInfo: userInfo,
                    connectionId: null,
                    cancellationToken: cancellationToken
                );
            }
            catch
            {
                XException.InvalidArgs.Throw();
            }

            //  
            // Validate Id ...
            isValid = id.IsValidIntId();
            if (!isValid)
            {
                XException.ActionFailed.Throw();
            }

            //
            // Retrieve Category Resourv=ce ...
            var result = await GetResource(
                id: id,
                cancellationToken: cancellationToken
            );

            //
            // Sending Push Notification ...
            isValid =
                isValid &&
                !result.IsNullOrDefault();
            if (isValid)
            {
                //
                await provider.SendPush(
                    connectionId: connectionId,
                    cancellationToken: cancellationToken,
                    payLoad: result.ToJSON(camelCase: true),
                    action: XBaseEntityHubAction.Add.GetStringValue()
                );
            }

            //
            return result;
        }

        /// <summary>
        /// Update a Category Item for Specified Language ...
        /// </summary>
        /// <param name="id"></param>
        /// <param name="item"></param>
        /// <param name="language"></param>
        /// <param name="connectionId"></param>
        /// <param name="userInfo"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<XCategoryResourceDto> Update(
            int id,
            XCategoryDto item,
            string language = null,
            string connectionId = null,
            XUserClaimsInfoDto userInfo = null,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Validate ...
            var isValid =
                id.IsValidIntId() &&
                !item.IsNullOrDefault() &&
                !language.IsNullOrEmpty() &&
                !item.Title.IsNullOrEmpty();
            if (!isValid)
            {
                XException.InvalidArgs.Throw();
            }

            //
            // Check Category Exists ...
            isValid = await IsExists(
                id: id,
                cancellationToken: cancellationToken
            );
            if (!isValid)
            {
                XException.NotFound.Throw();
            }

            //
            // Check Locale Exists ...
            isValid = await HasLocale(
                id: id,
                language: language,
                cancellationToken: cancellationToken
            );
            if (!isValid)
            {
                XException.NotFound.Throw();
            }

            //
            // Retrieve Category Dto for Validate Owining ...
            var dto = await Get(
                id: id,
                includeBuilder: null,
                cancellationToken: cancellationToken
            );

            //
            // Check Permission ...
            isValid =
                !dto.IsNullOrDefault() &&
                !userInfo.IsNullOrDefault() &&
                IsOwned(
                    item: dto,
                    userInfo: userInfo
                );
            if (!isValid)
            {
                XException.NotAllowed.Throw();
            }

            //
            // Retrieve Exists Item Resource ...
            var resource = await GetResource(
                id: id,
                cancellationToken: cancellationToken
            );

            //
            var titleUpdated = false;
            var descriptionUpdated = false;

            //
            // Update Title ...
            resource.Titles.Locales
                .ToList()
                .ForEach(tl =>
                {
                    //
                    if (tl.Language.Equals(language, System.StringComparison.InvariantCultureIgnoreCase))
                    {
                        //
                        titleUpdated = true;
                        tl.Value = item.Title;
                    }
                });

            //
            // Update Description ...
            resource.Descriptions.Locales
                .ToList()
                .ForEach(dl =>
                {
                    //
                    if (dl.Language.Equals(language, System.StringComparison.InvariantCultureIgnoreCase))
                    {
                        //
                        descriptionUpdated = true;
                        dl.Value = item.Description;
                    }
                });

            //
            // Validate Title and Description Updated ...
            isValid = titleUpdated && descriptionUpdated;
            if (!isValid)
            {
                XException.ActionFailed.Throw();
            }

            //
            resource = await RefereshResource(
                resource: resource,
                userInfo: userInfo,
                connectionId: connectionId,
                cancellationToken: cancellationToken
            );

            //
            return resource;
        }

        /// <summary>
        /// Referesh a Resource ...
        /// </summary>
        /// <param name="resource"></param>
        /// <param name="connectionId"></param>
        /// <param name="userInfo"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<XCategoryResourceDto> RefereshResource(
            XCategoryResourceDto resource,
            string connectionId = null,
            XUserClaimsInfoDto userInfo = null,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Validate Args ...
            var isValid =
                !resource.IsNull() &&
                !resource.Item.IsNullOrDefault();
            if (!isValid)
            {
                XException.InvalidArgs.Throw();
            }

            //
            var id = -1;

            //
            // Check Item Exists ...
            XCategoryDto dto =
                !resource.Item.Id.IsValidIntId()
                ? null
                : await Get(
                    id: resource.Item.Id,
                    includeBuilder: null,
                    cancellationToken: cancellationToken
            );
            var isExists = !dto.IsNullOrDefault();

            //
            // Do Referesh Based on Existance ...
            var isNew =
                !isExists &&
                !resource.Item.Id.IsValidIntId();
            if (isNew)
            {
                //
                // Add ...
            }
            else if (isExists)
            {
                //
                // Re State ...
                id = resource.Item.Id;
            }

            //
            isValid = id.IsValidIntId();
            if (!isValid)
            {
                XException.ActionFailed.Throw();
            }

            //
            // Get Result ...
            var result = await GetResource(
                id: id,
                cancellationToken: cancellationToken
            );

            //
            return result;
        }
    }
}