using System;
using System.Linq;
using xModels.Dtos;
using System.Threading;
using xCommons.Extensions;
using xTagService.Providers;
using xExceptions.Constants;
using xIdentityModels.Models;
using System.Threading.Tasks;
using xPushService.Constants;
using System.Linq.Expressions;
using xCommons.Configurations;
using xContentService.Constants;
using xContentService.Interfaces;
using System.Collections.Generic;
using xContentService.Extensions;
using xContentService.Models.Dtos;
using xContentService.Providers.Dtos;
using xContentService.Models.Entities;
using xContentService.Interfaces.Dtos;
using Microsoft.EntityFrameworkCore.Query;
using xContentService.Interfaces.Enrichers;

namespace xContentService.Providers
{
    public class XContentProvider : XBaseProvidedHasTag<XContent, XContentDto, Guid, XContentDtoHub>, IXContentProvider
    {
        private readonly IXContentEnricher enricher;
        private readonly XAppConfiguration configuration;
        private readonly IXContentTagProvider tagProvider;
        private readonly IXContentServiceProvider provider;
        private readonly IXContentTitleResourceProvider titleResourceProvider;
        private readonly IXContentDescriptionResourceProvider descriptionResourceProvider;

        public XContentProvider(
            IXContentEnricher enricher,
            XAppConfiguration configuration,
            IXContentTagProvider tagProvider,
            IXContentServiceProvider provider,
            IXContentTitleResourceProvider titleResourceProvider,
            IXContentDescriptionResourceProvider descriptionResourceProvider
        ) : base(
            provider: provider,
            tagProvider: tagProvider,
            permittedRoles: [XContentServiceConstants.XAdminRole]
        )
        {
            this.provider = provider;
            this.enricher = enricher;
            this.tagProvider = tagProvider;
            this.configuration = configuration;
            this.titleResourceProvider = titleResourceProvider;
            this.descriptionResourceProvider = descriptionResourceProvider;
        }

        public override bool IsOwned(
            XContent item,
            XUserClaimsInfoDto userInfo
        )
        {
            //
            var result =
                !item.IsNullOrDefault() &&
                !userInfo.IsNullOrDefault() &&
                !item.OwnerId.IsNullOrEmpty() &&
                userInfo.UserId == item.OwnerId;

            //
            return result;
        }

        public override bool IsOwned(
            XContentDto item,
            XUserClaimsInfoDto userInfo
        )
        {
            //
            var result =
                !item.IsNullOrDefault() &&
                !userInfo.IsNullOrDefault() &&
                !item.OwnerId.IsNullOrEmpty() &&
                userInfo.UserId == item.OwnerId;

            //
            return result;
        }

        //
        #region Overrides ...
        /// <summary>
        /// Get Specified Item by ID ...
        /// </summary>
        /// <param name="id"></param>
        /// <param name="includeBuilder"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public override async Task<XContentDto> Get(
            Guid id,
            Func<IQueryable<XContent>, IIncludableQueryable<XContent, object>> includeBuilder = null,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Retrieve Item ...
            var result = await provider.GetAsync(
                id: id,
                includeBuilder: null,
                ignoreSoftDeleteds: true,
                cancellationToken: cancellationToken
            );

            //
            // Handle Enrichment ...
            if (!result.IsNullOrDefault())
            {
                //
                result = await enricher.Enrich(
                    source: result,
                    cancellationToken: cancellationToken
                );
            }

            //
            return result;
        }

        /// <summary>
        /// Get All Exists Items ...
        /// </summary>
        /// <param name="orderBuilder"></param>
        /// <param name="includeBuilder"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public override async Task<IEnumerable<XContentDto>> GetAll(
            Func<IQueryable<XContent>, IOrderedQueryable<XContent>> orderBuilder = null,
            Func<IQueryable<XContent>, IIncludableQueryable<XContent, object>> includeBuilder = null,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Retrieve Items ...
            var result = await provider.GetAllAsync(
                ignoreSoftDeleteds: true,
                orderBuilder: orderBuilder,
                includeBuilder: includeBuilder,
                cancellationToken: cancellationToken
            );

            //
            // Handle Enrichment ...
            if (result.HasChild())
            {
                //
                result = await enricher.EnrichRange(
                    sources: result,
                    cancellationToken: cancellationToken
                );
            }

            //
            return result;
        }

        /// <summary>
        /// find an item by providing a Conditional Expression ...
        /// </summary>
        /// <param name="predicate"></param>
        /// <param name="includeBuilder"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public override async Task<XContentDto> FindOne(
            Expression<Func<XContent, bool>> predicate,
            Func<IQueryable<XContent>, IIncludableQueryable<XContent, object>> includeBuilder = null,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Detect Item ...
            var result = await provider.FindOneAsync(
                predicate: predicate,
                ignoreSoftDeleteds: true,
                includeBuilder: includeBuilder,
                cancellationToken: cancellationToken
            );

            //
            // Handle Enrichment ...
            if (!result.IsNullOrDefault())
            {
                //
                result = await enricher.Enrich(
                    source: result,
                    cancellationToken: cancellationToken
                );
            }

            //
            return result;
        }

        /// <summary>
        /// find a collection of Items by proving a Conditional Expression ...
        /// </summary>
        /// <param name="predicate"></param>
        /// <param name="orderBuilder"></param>
        /// <param name="includeBuilder"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public override async Task<IEnumerable<XContentDto>> FindMany(
            Expression<Func<XContent, bool>> predicate,
            Func<IQueryable<XContent>, IOrderedQueryable<XContent>> orderBuilder = null,
            Func<IQueryable<XContent>, IIncludableQueryable<XContent, object>> includeBuilder = null,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Detect Items ...
            var result = await provider.FindManyAsync(
                predicate: predicate,
                ignoreSoftDeleteds: true,
                orderBuilder: orderBuilder,
                includeBuilder: includeBuilder,
                cancellationToken: cancellationToken
            );

            //
            // Handle Enrichment ...
            if (result.HasChild())
            {
                //
                result = await enricher.EnrichRange(
                    sources: result,
                    cancellationToken: cancellationToken
                );
            }

            //
            return result;
        }

        /// <summary>
        /// retrieve Items based on XQuery Pagination structure ...
        /// </summary>
        /// <param name="query"></param>
        /// <param name="predicate"></param>
        /// <param name="orderBuilder"></param>
        /// <param name="includeBuilder"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public override async Task<XQueryResult<XContentDto>> Query(
            XQuery query,
            Expression<Func<XContent, bool>> predicate = null,
            Func<IQueryable<XContent>, IOrderedQueryable<XContent>> orderBuilder = null,
            Func<IQueryable<XContent>, IIncludableQueryable<XContent, object>> includeBuilder = null,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Query Items ...
            var result = await provider.QueryAsync(
                query: query,
                predicate: predicate,
                ignoreSoftDeleteds: true,
                orderBuilder: orderBuilder,
                includeBuilder: includeBuilder,
                cancellationToken: cancellationToken
            );

            //
            // Handle Enrichment ...
            if (!result.IsNullOrDefault() && result.Items.HasChild())
            {
                //
                result.Items = await enricher.EnrichRange(
                    sources: result.Items,
                    cancellationToken: cancellationToken
                );
            }

            //
            return result;
        }

        /// <summary>
        /// retrieve Owned Items based on XQuery Pagination structure ...
        /// if supported ...
        /// </summary>
        /// <param name="query"></param>
        /// <param name="userInfo"></param>
        /// <param name="predicate"></param>
        /// <param name="orderBuilder"></param>
        /// <param name="includeBuilder"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public override async Task<XQueryResult<XContentDto>> QueryOwned(
            XQuery query,
            XUserClaimsInfoDto userInfo = null,
            Expression<Func<XContent, bool>> predicate = null,
            Func<IQueryable<XContent>, IOrderedQueryable<XContent>> orderBuilder = null,
            Func<IQueryable<XContent>, IIncludableQueryable<XContent, object>> includeBuilder = null,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Prepare Predicator ...
            Expression<Func<XContent, bool>> predicateor = null;
            if (!predicate.IsNull())
            {
                //
                var predicateFnc = predicate.Compile();
                predicateor = x =>
                    predicateFnc(x) &&
                    IsOwned(x, userInfo);
            }
            else
            {
                predicateor = x => IsOwned(x, userInfo);
            }

            //
            // Query Items ...
            var result = await provider.QueryAsync(
                query: query,
                predicate: predicateor,
                ignoreSoftDeleteds: true,
                orderBuilder: orderBuilder,
                includeBuilder: includeBuilder,
                cancellationToken: cancellationToken
            );

            //
            // Handle Enrichment ...
            if (!result.IsNullOrDefault() && result.Items.HasChild())
            {
                //
                result.Items = await enricher.EnrichRange(
                    sources: result.Items,
                    cancellationToken: cancellationToken
                );
            }

            //
            return result;
        }

        /// <summary>
        /// Add an item values ...
        /// </summary>
        /// <param name="item"></param>
        /// <param name="userInfo"></param>
        /// <param name="connectionId"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public override async Task<XContentDto> Add(
            XContentDto item,
            XUserClaimsInfoDto userInfo = null,
            string connectionId = null,
            CancellationToken cancellationToken = default
        )
        {
            //
            var result = await Add(
                item: item,
                language: null,
                userInfo: userInfo,
                connectionId: connectionId,
                cancellationToken: cancellationToken
            );

            //
            return result;
        }

        /// <summary>
        /// Add an item values ...
        /// </summary>
        /// <param name="item"></param>
        /// <param name="userInfo"></param>
        /// <param name="connectionId"></param>
        /// <param name="language"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<XContentDto> Add(
            XContentDto item,
            XUserClaimsInfoDto userInfo = null,
            string connectionId = null,
            string language = null,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Validate ...
            var isValid = !item.IsNullOrDefault();
            if (!isValid)
            {
                XException.InvalidArgs.Throw();
            }

            //
            // Normalize ...

            //
            // Language ...
            if (language.IsNullOrEmpty())
            {
                language = configuration.DefaultLanguage;
            }

            //
            // Owner Id ...
            if (item.OwnerId.IsNullOrEmpty())
            {
                //
                if (!userInfo.IsNullOrDefault())
                {
                    item.OwnerId = userInfo.UserId;
                }
            }

            //
            // Created On ...
            item.CreatedOn = DateTime.UtcNow;

            //
            // Validate Normalized Items ...
            isValid = item.IsValid();
            if (!isValid)
            {
                XException.InvalidData.Throw();
            }

            //
            // Handle Insert Temp ...
            var result = await provider.AddAsync(
                item: item,
                saveChanges: true,
                connectionId: null, // Ignor Push Notifications ...,
                cancellationToken: cancellationToken
            );
            isValid = !result.IsNullOrDefault();
            if (!isValid)
            {
                XException.ActionFailed.Throw();
            }

            //
            // Handle Insert Title/Description ...

            //
            var titleResource = await titleResourceProvider.AddOrUpdateLocale(
                connectionId: null,
                identifier: result.Id,
                locale: new XLocaleResourceDto
                {
                    Language = language,
                    Value = result.Title,
                },
                cancellationToken: cancellationToken
            );

            //
            XResourceDto descriptionResource = null;
            if (!result.Description.IsNullOrEmpty())
            {
                //
                descriptionResource = await descriptionResourceProvider.AddOrUpdateLocale(
                    connectionId: null,
                    identifier: result.Id,
                    locale: new XLocaleResourceDto
                    {
                        Language = language,
                        Value = result.Description,
                    },
                    cancellationToken: cancellationToken
                );
            }

            //
            // Fill Item Title and Description ...
            if (titleResource.IsNullOrDefault())
            {
                result.Title = titleResource.Resource;
            }
            if (descriptionResource.IsNullOrDefault())
            {
                result.Description = descriptionResource.Resource;
            }

            //
            // Update Item ...
            result = await Update(
                item: result,
                id: result.Id,
                userInfo: userInfo,
                connectionId: null,
                cancellationToken: cancellationToken
            );
            isValid = !result.IsNullOrDefault();
            if (!isValid)
            {
                XException.ActionFailed.Throw();
            }

            //
            // Handle Enrichment ...
            if (isValid)
            {
                //
                result = await enricher.Enrich(
                    source: result,
                    cancellationToken: cancellationToken
                );
            }

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

            //
            return result;
        }

        /// <summary>
        /// Update an item values ...
        /// </summary>
        /// <param name="id"></param>
        /// <param name="item"></param>
        /// <param name="userInfo"></param>
        /// <param name="connectionId"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public override async Task<XContentDto> Update(
            Guid id,
            XContentDto item,
            XUserClaimsInfoDto userInfo = null,
            string connectionId = null,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Check Permission ...
            var hasPermission =
                IsOwned(item, userInfo) ||
                HasPermision(userInfo);
            if (!hasPermission)
            {
                XException.NotAllowed.Throw();
            }

            //
            // Handle Resources ...
            if (!item.TitleResource.IsNullOrDefault())
            {
                item.TitleResource = await titleResourceProvider.AddOrUpdateResource(
                    identifier: item.Id,
                    connectionId: connectionId,
                    resource: item.TitleResource,
                    cancellationToken: cancellationToken
                );
            }

            //
            // Handle Update on ...
            item.UpdatedAt = DateTime.UtcNow;

            //
            var result = await provider.UpdateAsync(
                id: id,
                item: item,
                saveChanges: true,
                connectionId: null,
                cancellationToken: cancellationToken
            );
            var isValid = !result.IsNullOrDefault();

            //
            // Handle Enrichment ...
            if (isValid)
            {
                //
                result = await enricher.Enrich(
                    source: result,
                    cancellationToken: cancellationToken
                );
            }

            //
            // Handle Notification ...
            if (isValid && !connectionId.IsNullOrEmpty())
            {
                //
                await provider.SendPush(
                    connectionId: connectionId,
                    cancellationToken: cancellationToken,
                    payLoad: result.ToJSON(camelCase: true),
                    action: XBaseEntityHubAction.Update.GetStringValue()
                );
            }

            //
            return result;
        }

        /// <summary>
        /// remove an Item ...
        /// </summary>
        /// <param name="id"></param>
        /// <param name="userInfo"></param>
        /// <param name="connectionId"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public override async Task<XContentDto> Remove(
            Guid id,
            XUserClaimsInfoDto userInfo = null,
            string connectionId = null,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Check Permission ...
            var item = await Get(
                id: id,
                cancellationToken: cancellationToken
            );
            var hasPermission =
                IsOwned(item, userInfo) ||
                HasPermision(userInfo);
            if (!hasPermission)
            {
                XException.NotAllowed.Throw();
            }

            //
            // Handle Item Remove ...
            var result = await provider.RemoveAsync(
                id: id,
                saveChanges: true,
                softDelete: false,
                connectionId: null,
                cancellationToken: cancellationToken
            );
            if (result.IsNullOrDefault())
            {
                XException.ActionFailed.Throw();
            }

            //
            // Remove Titles/Descriptions ...

            //
            // Titles ...
            await titleResourceProvider.RemoveLocales(
                connectionId: null,
                identifier: result.Id,
                cancellationToken: cancellationToken
            );

            //
            // Descriptions ...
            await descriptionResourceProvider.RemoveLocales(
                connectionId: null,
                identifier: result.Id,
                cancellationToken: cancellationToken
            );

            //
            // Handle Notifications ...
            if (!connectionId.IsNullOrEmpty())
            {
                //
                await provider.SendPush(
                    connectionId: connectionId,
                    cancellationToken: cancellationToken,
                    payLoad: result.ToJSON(camelCase: true),
                    action: XBaseEntityHubAction.Delete.GetStringValue()
                );
            }

            //
            return result;
        }
        #endregion
    }
}