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

namespace Newsbot.Collector.Services.Jobs;

public class YoutubeWatcherJobOptions
{
    public string? DatabaseConnectionString { get; set; }
    public string? OpenTelemetryConnectionString { get; set; }

    public int SleepTimer { get; set; } = 3000;
    public bool IsEnabled { get; set; } = true;
}

public class YoutubeWatcherJob
{
    private const string JobName = "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("", JobName);
    }

    public void InitAndExecute(YoutubeWatcherJobOptions options)
    {
        _articles = new ArticlesTable(options.DatabaseConnectionString ?? "");
        _queue = new DiscordQueueTable(options.DatabaseConnectionString ?? "");
        _source = new SourcesTable(options.DatabaseConnectionString ?? "");
        _icons = new IconsTable(options.DatabaseConnectionString ?? "");
        _logger = JobLogger.GetLogger(options.OpenTelemetryConnectionString ?? "", JobName);

        Execute();
    }

    private void Execute()
    {
        var sources = _source.ListByType(SourceTypes.YouTube, 100);

        foreach (var source in sources)
        {
            if (!source.Enabled)
            {
                _logger.Debug($"{JobName} - {source.Name} was disabled and will be skipped.");
                continue;
            }
            
            var channelId = source.YoutubeId;
            if (channelId == "")
            {
                channelId = GetChannelId(source.Url);
                _source.UpdateYoutubeId(source.Id, channelId);
            }
            
            // Make sure we have a Icon for the channel
            var icon = _icons.GetBySourceId(source.Id);
            if (icon.Id == Guid.Empty) Console.WriteLine("I was triggered :V");

            _logger.Information($"{JobName} - Checking '{source.Name}'");
            var url = $"https://www.youtube.com/feeds/videos.xml?channel_id={channelId}";

            var newVideos = CheckFeed(url, source);
            _logger.Debug($"{JobName} - Collected {newVideos.Count} new videos");
            foreach (var video in newVideos)
            {
                _logger.Debug($"{JobName} - {video.AuthorName} '{video.Title}' was found");
                _articles.New(video);
                _queue.New(new DiscordQueueEntity
                {
                    ArticleId = video.Id
                });
            }
        }
        
        _logger.Information($"{JobName} - Done");
    }

    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($"{JobName} - Unable to find the Youtube Channel ID for the requested url."),
                url);

        return id;
    }

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

        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 ArticlesEntity
            {
                //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;
    }
}