using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.BL;
using Tango.BL.Builders;
using Tango.BL.Entities;
using Tango.BL.Enumerations;
using Tango.Integration.Operation;
using Tango.PPC.Common;
using Tango.PPC.Common.Notifications;
using Tango.PPC.Common.Notifications.NotificationItems;
using Tango.PPC.Jobs.AppBarItems;
using Tango.PPC.Jobs.Messages;
using Tango.PPC.Jobs.NavigationObjects;
using Tango.PPC.Jobs.Views;

namespace Tango.PPC.Jobs.ViewModels
{
    /// <summary>
    /// Represents the main view ViewModel.
    /// </summary>
    /// <seealso cref="Tango.PPC.Common.PPCViewModel" />
    public class MainViewVM : PPCViewModel
    {
        private NotificationItem _last_failed_job_notification;
        private JobHandler _handler;
        private bool resuming;
        private JobProgressAppBarItem _appBarItem;

        /// <summary>
        /// Called when the application has been started.
        /// </summary>
        public override void OnApplicationStarted()
        {
            MachineProvider.MachineOperator.PrintingCompleted += MachineOperator_PrintingCompleted;
            MachineProvider.MachineOperator.PrintingFailed += MachineOperator_PrintingFailed;
            MachineProvider.MachineOperator.ResumingJob += MachineOperator_ResumingJob;
            MachineProvider.MachineOperator.PrintingStarted += MachineOperator_PrintingStarted;
            MachineProvider.MachineOperator.PrintingEnded += MachineOperator_PrintingEnded;
            NavigationManager.CurrentVMChanged += NavigationManager_CurrentVMChanged;
        }

        private void MachineOperator_PrintingEnded(object sender, PrintingEventArgs e)
        {
            _appBarItem?.Close();
            _appBarItem = null;
        }

        private void NavigationManager_CurrentVMChanged(object sender, PPCViewModel vm)
        {
            if (vm.GetType() == typeof(JobProgressViewVM))
            {
                _appBarItem?.Close();
                _appBarItem = null;
            }
            else if (vm.GetType() != typeof(JobSummeryViewVM) && _appBarItem == null && MachineProvider.MachineOperator.IsPrinting && _handler != null && !_handler.IsCanceled)
            {
                _appBarItem = NotificationProvider.PushAppBarItem<JobProgressAppBarItem>();
                _appBarItem.Pressed += (_, __) =>
                {
                    _appBarItem?.Close();
                    NavigationManager.NavigateTo<JobsV2Module>(nameof(JobProgressView));
                };
            }
        }

        private void MachineOperator_PrintingStarted(object sender, PrintingEventArgs e)
        {
            _handler = e.JobHandler;

            if (!BuildProvider.MachineType.IsXMachine())
            {
                if (resuming)
                {
                    resuming = false;

                    InvokeUI(() =>
                    {
                        NavigationManager.NavigateTo<JobsV2Module>(nameof(JobProgressView));

                        if (_last_failed_job_notification != null)
                        {
                            _last_failed_job_notification.Close();
                            _last_failed_job_notification = null;
                        }
                    });
                }
            }
        }

        private async void MachineOperator_ResumingJob(object sender, ResumingJobEventArgs e)
        {
            LogManager.Log($"Job resume request '{e.JobGuid}' approving...");

            try
            {
                using (ObservablesContext db = ObservablesContext.CreateDefault())
                {
                    var job = await new JobBuilder(db).Set(e.JobGuid).WithRML(null).WithConfiguration().WithSegments().WithBrushStops().BuildAsync();
                    e.Approve(job);
                    resuming = true;
                }
            }
            catch (Exception ex)
            {
                LogManager.Log(ex, "An error occurred while trying to resume the job.");
                InvokeUI(() =>
                {
                    NotificationProvider.ShowError("An error occurred while trying to resume a job in progress.");
                });
            }
        }

        /// <summary>
        /// Handles the PrintingFailed event of the MachineOperator.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="Integration.Operation.PrintingFailedEventArgs"/> instance containing the event data.</param>
        private void MachineOperator_PrintingFailed(object sender, PrintingFailedEventArgs e)
        {
            String message = $"{e.Exception.FlattenMessage()}";

            _last_failed_job_notification = NotificationProvider.PushNotification(new MessageNotificationItem(
                $"'{e.Job.Name}' failed at position {e.JobHandler.Status.ProgressMinusSettingUp.ToString("0.0")} out of {e.JobHandler.Status.TotalProgressMinusSettingUp.ToString("0.0")} meters.",
                message, MessageNotificationItem.MessageNotificationItemTypes.Error, () =>
                 {
                     NavigationManager.NavigateWithObject<JobsV2Module, JobView, Job>(e.Job);
                     NavigationManager.ClearHistoryExcept<JobsView>();
                 }, NotificationItem.NotificationPriority.VeryHigh));
        }

        /// <summary>
        /// Handles the PrintingCompleted event of the MachineOperator.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="Integration.Operation.PrintingEventArgs"/> instance containing the event data.</param>
        private void MachineOperator_PrintingCompleted(object sender, PrintingEventArgs e)
        {
            LogManager.Log($"'{e.Job.Name}' printing complete. Job designation is {e.Job.Designation}.");

            if (e.Job.Designation == BL.Enumerations.JobDesignations.SampleDye)
            {
                NotificationProvider.PushNotification(new MessageNotificationItem(String.Format("'{0}' sample dye completed successfully", e.Job.Name), "Tap to approve or repeat.", MessageNotificationItem.MessageNotificationItemTypes.Success, () =>
                   {
                       NavigationManager.NavigateWithObject<JobsV2Module, JobView, JobNavigationObject>(new JobNavigationObject() { Job = e.Job, Intent = JobNavigationIntent.SampleDye });
                       NavigationManager.ClearHistoryExcept<JobsView>();
                   }));
            }
            else if (e.Job.Designation == BL.Enumerations.JobDesignations.FineTuning)
            {
                //NotificationProvider.PushNotification(new MessageNotificationItem(String.Format("'{0}' fine tuning completed successfully", e.Job.Name), "Tap to approve or repeat.", MessageNotificationItem.MessageNotificationItemTypes.Success, () =>
                //{
                //    NavigationManager.NavigateWithObject<JobsV2Module, JobView, JobNavigationObject>(new JobNavigationObject() { Job = e.Job, Intent = JobNavigationIntent.FineTuning });
                //    NavigationManager.ClearHistoryExcept<JobsView>();
                //}));
            }
            else
            {
                if (BuildProvider.MachineType.IsXMachine())
                {
                    foreach (var item in NotificationProvider.NotificationItems.Where(x => x.CanClose).ToList())
                    {
                        NotificationProvider.PopNotification(item);
                    }
                }

                NotificationProvider.PushNotification(new MessageNotificationItem(String.Format("'{0}' completed successfully", e.Job.Name), "Tap to view this job details.", MessageNotificationItem.MessageNotificationItemTypes.Success, () =>
                {
                    NavigationManager.NavigateWithObject<JobsV2Module, JobView, JobNavigationObject>(new JobNavigationObject() { Job = e.Job });
                    NavigationManager.ClearHistoryExcept<JobsView>();
                }, NotificationItem.NotificationPriority.VeryHigh));
            }
        }

        public override void OnNavigatedTo()
        {
            base.OnNavigatedTo();
            RaiseMessage<NavigatedToJobsModuleMessage>();
        }
    }
}