Newsbot.Collector/Newsbot.Collector.Services/Jobs/DiscordNotificationJob.cs

using Newsbot.Collector.Database.Repositories;
using Newsbot.Collector.Domain.Entities;
using Newsbot.Collector.Domain.Interfaces;
using Newsbot.Collector.Domain.Models;
using Newsbot.Collector.Services.Notifications.Discord;
using Serilog;

namespace Newsbot.Collector.Services.Jobs;

public class MessageTypeNotRequestedException : Exception
{
    public MessageTypeNotRequestedException()
    {
    }

    public MessageTypeNotRequestedException(string message) : base(message)
    {
    }

    public MessageTypeNotRequestedException(string message, Exception inner) : base(message, inner)
    {
    }
}

public class DiscordNotificationJobOptions
{
    public string? ConnectionString { get; init; }
    public string? OpenTelemetry { get; init; }
    public bool IsEnabled { get; init; }
}

public class DiscordNotificationJob
{
    private const string JobName = "DiscordNotifications";
    private IArticlesRepository _article;
    private IIconsRepository _icons;
    private ILogger _logger;

    private IDiscordQueueRepository _queue;
    private ISourcesRepository _sources;
    private ISubscriptionRepository _subs;
    private IDiscordWebHooksRepository _webhook;

    public DiscordNotificationJob()
    {
        _queue = new DiscordQueueTable("");
        _article = new ArticlesTable("");
        _webhook = new DiscordWebhooksTable("");
        _sources = new SourcesTable("");
        _subs = new SubscriptionsTable("");
        _icons = new IconsTable("");
        _logger = JobLogger.GetLogger("", JobName);
    }

    public void InitAndExecute(DiscordNotificationJobOptions options)
    {
        _queue = new DiscordQueueTable(options.ConnectionString ?? "");
        _article = new ArticlesTable(options.ConnectionString ?? "");
        _webhook = new DiscordWebhooksTable(options.ConnectionString ?? "");
        _sources = new SourcesTable(options.ConnectionString ?? "");
        _subs = new SubscriptionsTable(options.ConnectionString ?? "");
        _icons = new IconsTable(options.ConnectionString ?? "");

        _logger = JobLogger.GetLogger(options.OpenTelemetry ?? "", JobName);

        if (!options.IsEnabled)
        {
            _logger.Warning($"{JobName} - Going to exit because feature flag is off.");
            return;
        }

        _logger.Information($"{JobName} - Starting up the job.");
        Execute();
    }

    private void Execute()
    {
        //collect all the new requests
        var requests = _queue.List(100);
        _logger.Debug($"{JobName} - Collected {requests.Count} items to send");

        foreach (var request in requests) ProcessQueueItem(request);

        _logger.Information($"{JobName} - Loop has been completed.");
    }

    public void ProcessQueueItem(DiscordQueueEntity request)
    {
        _logger.Debug($"{JobName} - Processing {request.Id}");
        // Get all details on the article in the queue
        var articleDetails = _article.GetById(request.ArticleId);

        // Get the details of the source
        var sourceDetails = _sources.GetByID(articleDetails.SourceId);
        if (sourceDetails.ID == Guid.Empty)
        {
            _logger.Error(
                $"{JobName} - Article ({articleDetails.Id}) was linked to a empty Source ID.  Removing from the queue.");
            _queue.Delete(request.Id);
            return;
        }

        var sourceIcon = new IconModel();
        try
        {
            sourceIcon = _icons.GetBySourceId(sourceDetails.ID);
        }
        catch
        {
            _logger.Warning("{JobName} - Source ID \'{SourceDetailsId}\' is missing an icon", JobName,
                sourceDetails.ID);
        }

        // Find all the subscriptions for that source
        var allSubscriptions = _subs.ListBySourceID(sourceDetails.ID);

        foreach (var sub in allSubscriptions)
            SendSubscriptionNotification(request.Id, articleDetails, sourceDetails, sourceIcon, sub);

        _logger.Debug("{JobName} - Removing {RequestId} from the queue", JobName, request.Id);
        _queue.Delete(request.Id);
    }

    public void SendSubscriptionNotification(Guid requestId, ArticlesEntity articleDetails, SourceModel sourceDetails,
        IconModel sourceIcon, SubscriptionModel sub)
    {
        // Check if the subscription code flags
        // If the article is a code commit and the subscription does not want them, skip.
        if (articleDetails.CodeIsCommit && !sub.CodeAllowCommits) throw new MessageTypeNotRequestedException("Message was a code commit and was not requested by the subscription.");

        // same for releases
        if (articleDetails.CodeIsRelease && !sub.CodeAllowReleases) throw new MessageTypeNotRequestedException("Message was a code release and was not requested by the subscription");

        // find the discord webhooks we need to post to
        var discordDetails = _webhook.GetByID(sub.DiscordWebHookId);
        if (discordDetails.Enabled == false) return;

        var client = new DiscordWebhookClient(discordDetails.Url);
        try
        {
            client.SendMessage(GenerateDiscordMessage(sourceDetails, articleDetails, sourceIcon));
        }
        catch (Exception e)
        {
            _logger.Error("Failed to post message to Discord. {ErrorMessage}", e.Message);
            _logger.Debug("Queue Record: {RequestId}", requestId);
            _logger.Debug("Article: {ArticleDetailsId}", articleDetails.Id);
            _logger.Debug("Source: {SourceDetailsId}", sourceDetails.ID);
            _logger.Debug("Subscription: {SubId}", sub.Id);
        }

        Thread.Sleep(3000);
    }

    public DiscordMessage GenerateDiscordMessage(SourceModel source, ArticlesEntity article, IconModel icon)
    {
        var embed = new DiscordMessageEmbed
        {
            Title = article.Title,
            Color = DiscordMessageEmbedColors.Red,
            Description = MessageValidation.ConvertHtmlCodes(article.Description),
            Author = new DiscordMessageEmbedAuthor
            {
                Name = article.AuthorName,
                IconUrl = icon.FileName
            },
            Footer = new DiscordMessageEmbedFooter
            {
                Text = "Brought to you by Newsbot"
            },
            Fields = new DiscordMessageEmbedField[]
            {
                new()
                {
                    Name = "Link",
                    Value = article.Url,
                    Inline = false
                }
            }
        };

        if (article.Url is not null && article.Url != "") embed.Url = article.Url;

        if (article.Thumbnail != "")
            embed.Image = new DiscordMessageEmbedImage
            {
                Url = article.Thumbnail
            };

        if (article.AuthorImage is not null && article.AuthorImage != "") embed.Author.IconUrl = article.AuthorImage;

        return new DiscordMessage
        {
            Embeds = new[]
            {
                embed
            }
        };
    }
}