using System.ServiceModel.Syndication;
using System.Xml;
using Newsbot.Collector.Database.Repositories;
using Newsbot.Collector.Domain.Consts;
using Newsbot.Collector.Domain.Interfaces;
using Newsbot.Collector.Domain.Models;
using Newsbot.Collector.Domain.Models.Config;
using Newsbot.Collector.Services.HtmlParser;
using Serilog;

namespace Newsbot.Collector.Services.Jobs;

public class YoutubeWatcherJobOptions
{
    public ConfigSectionConnectionStrings? ConnectionStrings { get; set; }
    public int SleepTimer { get; set; } = 3000;
}

public class YoutubeWatcherJob
{
    private readonly YoutubeWatcherJobOptions _options;
    private IArticlesRepository _articles;
    private IIconsRepository _icons;
    private ILogger _logger;
    private IDiscordQueueRepository _queue;
    private ISourcesRepository _source;

    public YoutubeWatcherJob()
    {
        _options = new YoutubeWatcherJobOptions();
        _articles = new ArticlesTable("");
        _queue = new DiscordQueueTable("");
        _source = new SourcesTable("");
        _icons = new IconsTable("");
        _logger = JobLogger.GetLogger("", "YoutubeWatcherJob");
    }

    public void InitAndExecute(YoutubeWatcherJobOptions options)
    {
        options.ConnectionStrings ??= new ConfigSectionConnectionStrings();

        _articles = new ArticlesTable(options.ConnectionStrings.Database ?? "");
        _queue = new DiscordQueueTable(options.ConnectionStrings.Database ?? "");
        _source = new SourcesTable(options.ConnectionStrings.Database ?? "");
        _icons = new IconsTable(options.ConnectionStrings.Database ?? "");
        _logger = JobLogger.GetLogger(options.ConnectionStrings.OpenTelemetry ?? "", "YoutubeWatcherJob");

        Execute();
    }

    private void Execute()
    {
        var videos = new List<ArticlesModel>();

        var sources = _source.ListByType(SourceTypes.YouTube, 100);

        foreach (var source in sources) CheckSource(source);
    }

    private void CheckSource(SourceModel source)
    {
        var channelId = "";

        if (source.YoutubeId == "")
        {
            channelId = GetChannelId(source.Url);
            _source.UpdateYoutubeId(source.ID, channelId);
        }
        else
        {
            channelId = source.YoutubeId;
        }

        // Make sure we have a Icon for the channel
        var icon = _icons.GetBySourceId(source.ID);
        if (icon.Id == Guid.Empty)
        {
        }

        var url = $"https://www.youtube.com/feeds/videos.xml?channel_id={channelId}";

        var newVideos = CheckFeed(url, source);
        foreach (var video in newVideos) _articles.New(video);
    }

    private string GetChannelId(string url)
    {
        // Collect the Channel ID and store it for later.
        var pageReader = new HtmlPageReader(new HtmlPageReaderOptions
        {
            Url = url
        });
        pageReader.Parse();

        var id = pageReader.Data.Header.YoutubeChannelID ?? "";
        if (id == "") _logger.Error(new Exception("Unable to find the Youtube Channel ID for the requested url."), url);

        return id;
    }

    private List<ArticlesModel> CheckFeed(string url, SourceModel source)
    {
        var videos = new List<ArticlesModel>();

        using var reader = XmlReader.Create(url);
        var feed = SyndicationFeed.Load(reader);
        foreach (var post in feed.Items.ToList())
        {
            var articleUrl = post.Links[0].Uri.AbsoluteUri;
            if (IsThisUrlKnown(articleUrl)) continue;

            var videoDetails = new HtmlPageReader(new HtmlPageReaderOptions
            {
                Url = articleUrl
            });
            videoDetails.Parse();

            var article = new ArticlesModel
            {
                //Todo add the icon 
                AuthorName = post.Authors[0].Name,
                Title = post.Title.Text,
                Tags = FetchTags(post),
                URL = articleUrl,
                PubDate = post.PublishDate.DateTime,
                Thumbnail = videoDetails.Data.Header.Image,
                Description = videoDetails.Data.Header.Description,
                SourceID = source.ID,
                Video = "true"
            };

            videos.Add(article);
            Thread.Sleep(_options.SleepTimer);
        }

        return videos;
    }

    private bool IsThisUrlKnown(string url)
    {
        var isKnown = _articles.GetByUrl(url);
        if (isKnown.URL == url) return true;
        return false;
    }

    private static string FetchTags(SyndicationItem post)
    {
        var result = "";
        foreach (var tag in post.Categories) result += $"{tag.Name},";
        return result;
    }
}