using System.IO;
using System.Net;
using Azaion.Common.Database;
using Azaion.Common.DTO;
using Azaion.Common.DTO.Config;
using Azaion.Common.DTO.Queue;
using Azaion.Common.Extensions;
using LinqToDB;
using MessagePack;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Newtonsoft.Json;
using RabbitMQ.Stream.Client;
using RabbitMQ.Stream.Client.AMQP;
using RabbitMQ.Stream.Client.Reliable;

namespace Azaion.Common.Services;

public class FailsafeAnnotationsProducer
{
    private readonly ILogger<FailsafeAnnotationsProducer> _logger;
    private readonly IDbFactory _dbFactory;
    private readonly IAzaionApi _azaionApi;
    private readonly QueueConfig _queueConfig;
    private readonly UIConfig _uiConfig;

    private Producer _annotationProducer = null!;


    public FailsafeAnnotationsProducer(ILogger<FailsafeAnnotationsProducer> logger,
        IDbFactory dbFactory,
        IOptions<QueueConfig> queueConfig,
        IOptions<UIConfig> uiConfig,
        IAzaionApi azaionApi)
    {
        _logger = logger;
        _dbFactory = dbFactory;
        _azaionApi = azaionApi;
        _queueConfig = queueConfig.Value;
        _uiConfig = uiConfig.Value;
        Task.Run(async () => await ProcessQueue());
    }

    private async Task<StreamSystem> GetProducerQueueConfig()
    {
        return await StreamSystem.Create(new StreamSystemConfig
        {
            Endpoints = new List<EndPoint> { new IPEndPoint(IPAddress.Parse(_queueConfig.Host), _queueConfig.Port) },
            UserName = _queueConfig.ProducerUsername,
            Password = _queueConfig.ProducerPassword
        });
    }

    private async Task ProcessQueue(CancellationToken ct = default)
    {
        _annotationProducer = await Producer.Create(new ProducerConfig(await GetProducerQueueConfig(), Constants.MQ_ANNOTATIONS_QUEUE));
        var currentUser = await _azaionApi.GetCurrentUserAsync();
        while (!ct.IsCancellationRequested)
        {
            var sent = false;
            while (!sent || !ct.IsCancellationRequested) //Waiting for send
            {
                try
                {
                    var (records, annotationsDict) = await _dbFactory.Run(async db =>
                    {
                        var records = await db.AnnotationsQueueRecords.OrderBy(x => x.DateTime).ToListAsync(token: ct);
                        var editedCreatedNames = records
                            .Where(x => x.Operation.In(AnnotationStatus.Created, AnnotationStatus.Edited))
                            .Select(x => x.AnnotationNames.FirstOrDefault())
                            .ToList();

                        var annotationsDict = await db.Annotations.LoadWith(x => x.Detections)
                            .Where(x => editedCreatedNames.Contains(x.Name))
                            .ToDictionaryAsync(a => a.Name, token: ct);
                        return (records, annotationsDict);
                    });

                    var messages = new List<Message>();
                    foreach (var record in records)
                    {
                        var appProperties = new ApplicationProperties
                        {
                            { nameof(AnnotationStatus), record.Operation.ToString() },
                            { nameof(User.Email), currentUser.Email }
                        };

                        if (record.Operation.In(AnnotationStatus.Validated, AnnotationStatus.Deleted))
                        {
                            var message = new Message(MessagePackSerializer.Serialize(new AnnotationBulkMessage
                            {
                                AnnotationNames = record.AnnotationNames.ToArray(),
                                AnnotationStatus = record.Operation,
                                Email = currentUser.Email,
                                CreatedDate = record.DateTime
                            })) { ApplicationProperties = appProperties };

                            messages.Add(message);
                        }
                        else
                        {
                            var annotation = annotationsDict!.GetValueOrDefault(record.AnnotationNames.FirstOrDefault());
                            if (annotation == null)
                                continue;

                            var image = record.Operation == AnnotationStatus.Created
                                ? await File.ReadAllBytesAsync(annotation.ImagePath, ct)
                                : null;

                            var annMessage = new AnnotationMessage
                            {
                                Name = annotation.Name,
                                OriginalMediaName = annotation.OriginalMediaName,
                                Time = annotation.Time,
                                Role = annotation.CreatedRole,
                                Email = annotation.CreatedEmail,
                                CreatedDate = annotation.CreatedDate,
                                Status = annotation.AnnotationStatus,

                                ImageExtension = annotation.ImageExtension,
                                Image = image,
                                Detections = JsonConvert.SerializeObject(annotation.Detections),
                                Source = annotation.Source,
                            };
                            var message = new Message(MessagePackSerializer.Serialize(annMessage)) { ApplicationProperties = appProperties };

                            messages.Add(message);
                        }
                    }

                    if (messages.Any())
                    {
                        await _annotationProducer.Send(messages, CompressionType.Gzip);
                        var ids = records.Select(x => x.Id).ToList();
                        var removed = await _dbFactory.RunWrite(async db => await db.AnnotationsQueueRecords.DeleteAsync(x => ids.Contains(x.Id), token: ct));
                        sent = true;
                    }
                }
                catch (Exception e)
                {
                    _logger.LogError(e, e.Message);
                    await Task.Delay(TimeSpan.FromSeconds(10), ct);
                }
                await Task.Delay(TimeSpan.FromSeconds(10), ct);
            }
        }
        await Task.Delay(TimeSpan.FromSeconds(5), ct);
    }

    public async Task SendToInnerQueue(List<string> annotationNames, AnnotationStatus status, CancellationToken cancellationToken = default)
    {
        if (_uiConfig.SilentDetection)
            return;
        await _dbFactory.RunWrite(async db =>
            await db.InsertAsync(new AnnotationQueueRecord
            {
                Id = Guid.NewGuid(),
                DateTime = DateTime.UtcNow,
                Operation = status,
                AnnotationNames = annotationNames
            }, token: cancellationToken));
    }
}