using System.Linq;
using xModels.Dtos;
using System.Threading;
using xCommons.Extensions;
using System.Threading.Tasks;
using System.Collections.Generic;
using xContentService.Interfaces;
using xContentService.Models.Dtos;
using xIdentityService.Interfaces;
using xIdentityService.Extensions;
using xContentService.Models.Entities;
using xContentService.Interfaces.Enrichers;

namespace xContentService.Providers.Enrichers
{
    public class XContentEnricher : IXContentEnricher
    {
        private readonly IXIdentityProvider identityProvider;
        private readonly IXContentTitleResourceProvider titleResourceProvider;
        private readonly IXContentDescriptionResourceProvider descriptionResourceProvider;

        public XContentEnricher(
            IXIdentityProvider identityProvider,
            IXContentTitleResourceProvider titleResourceProvider,
            IXContentDescriptionResourceProvider descriptionResourceProvider
        )
        {
            this.identityProvider = identityProvider;
            this.titleResourceProvider = titleResourceProvider;
            this.descriptionResourceProvider = descriptionResourceProvider;
        }

        //
        #region Enrichers ...
        /// <summary>
        /// Enrich Specified Item ...
        /// </summary>
        /// <param name="source"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<XContentDto> Enrich(
            XContent source,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Mapping Default ...
            var result = source.MapConvert<XContentDto, XContent>();
            result = await Enrich(
                source: result,
                cancellationToken: cancellationToken
            );

            //
            return result;
        }

        /// <summary>
        /// Enrich Specified Item ...
        /// </summary>
        /// <param name="source"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<XContentDto> Enrich(
            XContentDto source,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Handdle Owner ...
            XPersonDto owner = null;
            if (!source.OwnerId.IsNullOrEmpty())
            {
                //
                // Try to Retrieve User Info ...
                var device = identityProvider.GetDevice();
                var userInfo = await identityProvider.GetUserInfo(
                    device: device,
                    userSelectByParam: source.OwnerId
                );
                owner = userInfo.ToXPersonDto();
            }

            //
            // Hanlde Content Title ...
            string contentTitle = string.Empty;
            XResourceDto titleResource = await titleResourceProvider.GetResource(
                identifier: source.Id,
                cancellationToken: cancellationToken
            );
            if (!titleResource.IsNullOrDefault())
            {
                contentTitle = titleResource.Resource;
            }

            //
            // Hanlde Content Description ...
            string contentDescription = string.Empty;
            XResourceDto descriptionResource = await descriptionResourceProvider.GetResource(
                identifier: source.Id,
                cancellationToken: cancellationToken
            );
            if (!descriptionResource.IsNullOrDefault())
            {
                contentDescription = descriptionResource.Resource;
            }

            //
            // Attach Extracted Items ...
            var result = source.MapConvert();
            result.Owner = owner;
            result.Title = contentTitle;
            result.TitleResource = titleResource;
            result.Description = contentDescription;
            result.DescriptionResource = descriptionResource;

            //
            return result;
        }

        /// <summary>
        /// Enrich Specified Items ...
        /// </summary>
        /// <param name="sources"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<IEnumerable<XContentDto>> EnrichRange(
            IEnumerable<XContent> sources,
            CancellationToken cancellationToken = default
        )
        {
            //
            var tasks = sources
                .Select(x => Enrich(x, cancellationToken));

            //
            var result = await Task.WhenAll(tasks);
            return result;
        }

        /// <summary>
        /// Enrich Specified Items ...
        /// </summary>
        /// <param name="sources"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<IEnumerable<XContentDto>> EnrichRange(
            IEnumerable<XContentDto> sources,
            CancellationToken cancellationToken = default
        )
        {
            //
            var tasks = sources
                .Select(x => Enrich(x, cancellationToken));

            //
            var result = await Task.WhenAll(tasks);
            return result;
        }
        #endregion
    }
}