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

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

        private readonly OperationExecutionState state = state;
        private readonly ExecutorFactory executorFactory = executorFactory;
        private readonly IServiceScopeFactory scopeFactory = scopeFactory;

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

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

            InitializeClient();

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

                    if (stoppingToken.IsCancellationRequested) return;

                    var scope = scopeFactory.CreateScope();
                    var headquartersService = scope.ServiceProvider.GetRequiredService<HeadquartersService>();
                    var messageGuid = string.Empty;
                    try
                    {
                        var startedAt = DateTime.UtcNow;
                        await headquartersService.SetOperationStartedAsync(operation.Id, startedAt);

                        state.InvokeOnOperationStarted(operation.Id, operation.CampaignId, startedAt);

                        var executor = executorFactory.CreateExecutor(scope, client, operation);
                        messageGuid = await executor.ExecuteAsync(stoppingToken);
                    }
                    catch (Exception e)
                    {
                        var endedAt = DateTime.UtcNow;
                        var failureReason = e.CombineMessages();
                        await headquartersService.SetOperationEndedWithFailAsync(operation.Id, endedAt, failureReason);

                        state.InvokeOnOperationEnded(operation.Id, operation.CampaignId, endedAt, failureReason);
                    }

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

                        state.InvokeOnOperationExecuted(operation.Id, operation.CampaignId, messageGuid);
                    }

                    state.UnsetProcessingOperation(operation);
                }

                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.GetNotExecutedOperationsAsync();
            foreach (var operation in operations)
            {
                state.EnqueueOperation(operation);
            }

            state.Ready = true;
        }

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