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 IAuthorTable _author;
    private IIconsRepository _icons;
    private ILogger _logger;
    private IDiscordQueueRepository _queue;
    private ISourcesRepository _source;

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

    public void InitAndExecute(YoutubeWatcherJobOptions options)
    {
        _articles = new ArticlesTable(options.DatabaseConnectionString ?? "");
        _author = new AuthorsTable(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 = FindMissingPosts(url, source);
            _logger.Debug($"{JobName} - Collected {newVideos.Count} new videos");
            
            foreach (var video in newVideos)
            {
                var author = _author.GetById(video.AuthorId);
                author.Wait();

                if (author.Result is null)
                {
                    _logger.Warning("Missing author record for article id {VideoId}", video.Id);
                }
                else
                {
                    _logger.Debug("{JobName} - {ResultName} \'{VideoTitle}\' was found", JobName, author.Result.Name, video.Title);
                }
                
                _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"), "");

        return id;
    }

    private List<ArticlesEntity> FindMissingPosts(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 article = CheckFeedItem(post, source.Id);
            if (article is null) continue;
            videos.Add(article);
        }

        return videos;
    }

    private ArticlesEntity? CheckFeedItem(SyndicationItem post, Guid sourceId)
    {
        var articleUrl = post.Links[0].Uri.AbsoluteUri;
        if (IsThisUrlKnown(articleUrl)) return null;

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

        var author = _author.CreateIfMissingAsync(new AuthorEntity
        {
            Image = post.Authors[0].Uri,
            Name = post.Authors[0].Name
        });
        author.Wait();

        var article = new ArticlesEntity
        {
            //Todo add the icon 
            AuthorId = author.Result.Id,
            Title = post.Title.Text,
            Tags = FetchTags(post),
            Url = articleUrl,
            PubDate = post.PublishDate.DateTime,
            Thumbnail = videoDetails.Data.Header.Image,
            Description = videoDetails.Data.Header.Description,
            SourceId = sourceId,
            Video = "true"
        };

        return article;
    }
    
    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;
    }
}