// (c) Copyright Ascensio System SIA 2010-2022
//
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namespace ASC.ActiveDirectory.ComplexOperations;

[Singletone(Additional = typeof(LdapOperationExtension))]
public class LdapSaveSyncOperation
{
    public const string CUSTOM_DISTRIBUTED_TASK_QUEUE_NAME = "ldapOperation";

    private readonly DistributedTaskQueue _progressQueue;
    private readonly IServiceProvider _serviceProvider;

    public LdapSaveSyncOperation(
        IServiceProvider serviceProvider,
         IDistributedTaskQueueFactory queueFactory)
    {
        _serviceProvider = serviceProvider;
        _progressQueue = queueFactory.CreateQueue(CUSTOM_DISTRIBUTED_TASK_QUEUE_NAME);
    }

    public void RunJob(LdapSettings settings, Tenant tenant, LdapOperationType operationType, LdapLocalization resource = null, string userId = null)
    {
        var item = _progressQueue.GetAllTasks<LdapOperationJob>().FirstOrDefault(t => t.TenantId == tenant.Id);
        if (item != null && item.IsCompleted)
        {
            _progressQueue.DequeueTask(item.Id);
            item = null;
        }
        if (item == null)
        {
            using var scope = _serviceProvider.CreateScope();
            item = scope.ServiceProvider.GetRequiredService<LdapOperationJob>();
            item.InitJob(settings, tenant, operationType, resource, userId);
            _progressQueue.EnqueueTask(item);
        }

        item.PublishChanges();
    }

    public LdapOperationStatus TestLdapSave(LdapSettings ldapSettings, Tenant tenant, string userId)
    {
        var (hasStarted, operations) = HasStarterdForTenant(tenant.Id, LdapOperationType.SyncTest, LdapOperationType.SaveTest);

        if (hasStarted)
        {
            return ToLdapOperationStatus(tenant.Id);
        }

        if (operations.Any(o => o.Status <= DistributedTaskStatus.Running))
        {
            return GetStartProcessError();
        }

        var ldapLocalization = new LdapLocalization();
        ldapLocalization.Init(Resource.ResourceManager);

        RunJob(ldapSettings, tenant, LdapOperationType.SaveTest, ldapLocalization, userId);
        return ToLdapOperationStatus(tenant.Id);
    }

    public LdapOperationStatus SaveLdapSettings(LdapSettings ldapSettings, Tenant tenant, string userId)
    {
        var operations = GetOperationsForTenant(tenant.Id);

        if (operations.Any(o => o.Status <= DistributedTaskStatus.Running))
        {
            return GetStartProcessError();
        }

        //ToDo
        ldapSettings.AccessRights.Clear();

        if (!ldapSettings.LdapMapping.ContainsKey(LdapSettings.MappingFields.MailAttribute) || string.IsNullOrEmpty(ldapSettings.LdapMapping[LdapSettings.MappingFields.MailAttribute]))
        {
            ldapSettings.SendWelcomeEmail = false;
        }

        var ldapLocalization = new LdapLocalization();
        ldapLocalization.Init(Resource.ResourceManager, WebstudioNotifyPatternResource.ResourceManager);

        RunJob(ldapSettings, tenant, LdapOperationType.Save, ldapLocalization, userId);
        return ToLdapOperationStatus(tenant.Id);
    }

    public LdapOperationStatus SyncLdap(LdapSettings ldapSettings, Tenant tenant, string userId)
    {
        var (hasStarted, operations) = HasStarterdForTenant(tenant.Id, LdapOperationType.Sync, LdapOperationType.Save);

        if (hasStarted)
        {
            return ToLdapOperationStatus(tenant.Id);
        }

        if (operations.Any(o => o.Status <= DistributedTaskStatus.Running))
        {
            return GetStartProcessError();
        }

        var ldapLocalization = new LdapLocalization();
        ldapLocalization.Init(Resource.ResourceManager);

        RunJob(ldapSettings, tenant, LdapOperationType.Sync, ldapLocalization, userId);
        return ToLdapOperationStatus(tenant.Id);
    }

    public LdapOperationStatus TestLdapSync(LdapSettings ldapSettings, Tenant tenant)
    {
        var (hasStarted, operations) = HasStarterdForTenant(tenant.Id, LdapOperationType.SyncTest, LdapOperationType.SaveTest);

        if (hasStarted)
        {
            return ToLdapOperationStatus(tenant.Id);
        }

        if (operations.Any(o => o.Status <= DistributedTaskStatus.Running))
        {
            return GetStartProcessError();
        }

        var ldapLocalization = new LdapLocalization();
        ldapLocalization.Init(Resource.ResourceManager);

        RunJob(ldapSettings, tenant, LdapOperationType.SyncTest, ldapLocalization);
        return ToLdapOperationStatus(tenant.Id);
    }

    public LdapOperationStatus ToLdapOperationStatus(int tenantId)
    {
        var operations = _progressQueue.GetAllTasks<LdapOperationJob>().ToList();

        foreach (var o in operations)
        {
            if (Process.GetProcesses().Any(p => p.Id == o.InstanceId))
            {
                continue;
            }

            o[LdapTaskProperty.PROGRESS] = 100;
            _progressQueue.DequeueTask(o.Id);
        }

        var operation =
            operations
                .FirstOrDefault(t => t[LdapTaskProperty.OWNER] == tenantId);

        if (operation == null)
        {
            return null;
        }

        if (DistributedTaskStatus.Running < operation.Status)
        {
            operation[LdapTaskProperty.PROGRESS] = 100;
            _progressQueue.DequeueTask(operation.Id);
        }

        var result = new LdapOperationStatus
        {
            Id = operation.Id,
            Completed = operation[LdapTaskProperty.FINISHED],
            Percents = operation[LdapTaskProperty.PROGRESS],
            Status = operation[LdapTaskProperty.RESULT],
            Error = operation[LdapTaskProperty.ERROR],
            CertificateConfirmRequest = operation[LdapTaskProperty.CERT_REQUEST] != "" ? operation[LdapTaskProperty.CERT_REQUEST] : null,
            Source = operation[LdapTaskProperty.SOURCE],
            OperationType = operation[LdapTaskProperty.OPERATION_TYPE],
            Warning = operation[LdapTaskProperty.WARNING]
        };

        if (!(string.IsNullOrEmpty(result.Warning)))
        {
            operation[LdapTaskProperty.WARNING] = ""; // "mark" as read
        }

        return result;
    }

    private static LdapOperationStatus GetStartProcessError()
    {
        var result = new LdapOperationStatus
        {
            Id = null,
            Completed = true,
            Percents = 0,
            Status = "",
            Error = Resource.LdapSettingsTooManyOperations,
            CertificateConfirmRequest = null,
            Source = ""
        };

        return result;
    }

    private (bool hasStarted, List<LdapOperationJob> operations) HasStarterdForTenant(int tenantId, LdapOperationType arg1, LdapOperationType arg2)
    {
        var operations = GetOperationsForTenant(tenantId);

        var hasStarted = operations.Any(o =>
        {
            var opType = o[LdapTaskProperty.OPERATION_TYPE];

            return o.Status <= DistributedTaskStatus.Running &&
                   (opType == arg1.ToString() || opType == arg2.ToString());
        });

        return (hasStarted, operations);
    }

    private List<LdapOperationJob> GetOperationsForTenant(int tenantId)
    {
        return _progressQueue.GetAllTasks<LdapOperationJob>()
            .Where(t => t[LdapTaskProperty.OWNER] == tenantId)
            .ToList();
    }

    public static class LdapOperationExtension
    {
        public static void Register(DIHelper services)
        {
            services.TryAdd<LdapOperationJob>();
        }
    }
}