using Hcs.Broker;
using Hcs.Broker.Logger;
using Hcs.Broker.MessageCapturer;
using Hcs.WebApp.BackgroundServices.OperationExecutors;
using Hcs.WebApp.Config;
using Hcs.WebApp.Services;

namespace Hcs.WebApp.BackgroundServices
{
    public class OperationExecutionService(OperationExecutionState state, IServiceScopeFactory scopeFactory) : BackgroundService
    {
        private const int SLEEP_TIME = 30000;

        private readonly OperationExecutionState state = state;
        private readonly IServiceScopeFactory scopeFactory = scopeFactory;
        private readonly ExecutorFactory executorFactory = new();

        private Broker.Logger.ILogger logger;
        private IMessageCapturer messageCapturer;
        private IClient client;

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            await InitializeStateAsync();

            InitializeClient();

            var scope = scopeFactory.CreateScope();
            var headquartersService = scope.ServiceProvider.GetRequiredService<HeadquartersService>();

            while (!stoppingToken.IsCancellationRequested)
            {
                while (state.TryDequeueOperation(out var operation))
                {
                    if (stoppingToken.IsCancellationRequested) return;

                    var messageGuid = string.Empty;
                    try
                    {
                        var executor = executorFactory.CreateExecutor(client, operation);
                        messageGuid = await executor.ExecuteAsync(stoppingToken);
                    }
                    catch
                    {
                        // TODO: Добавить таймауты и макс количество попыток выполнения операции
                        state.EnqueueOperation(operation);
                    }

                    if (!string.IsNullOrEmpty(messageGuid))
                    {
                        await headquartersService.SetOperationMessageGuidAsync(operation.Id, messageGuid);
                    }
                }

                await Task.Delay(SLEEP_TIME, stoppingToken);
            }
        }

        private async Task InitializeStateAsync()
        {
            using var scope = scopeFactory.CreateScope();
            var headquartersService = scope.ServiceProvider.GetRequiredService<HeadquartersService>();

            var operations = await headquartersService.GetInitiatedOperationsAsync();
            foreach (var operation in operations)
            {
                state.EnqueueOperation(operation);
            }
        }

        private void InitializeClient()
        {
            logger = new ActionLogger();
            messageCapturer = new FileMessageCapturer("messages", logger);

            using var scope = scopeFactory.CreateScope();
            var configuration = scope.ServiceProvider.GetRequiredService<IConfiguration>();
            var config = configuration.GetSection("BrokerConfig").Get<BrokerConfig>()!;
            var clientProvider = scope.ServiceProvider.GetRequiredService<IClientProvider>();
            client = clientProvider.CreateClient(config, logger, messageCapturer);
        }
    }
}