using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.BL.Entities;
using Tango.Integration.Operation;
using Tango.PPC.Common;
using Tango.PPC.Common.Navigation;
using Tango.PPC.Jobs.AppBarItems;
using Tango.PPC.Jobs.Views;

namespace Tango.PPC.Jobs.ViewModels
{
    /// <summary>
    /// Represents the job progress view model.
    /// </summary>
    /// <seealso cref="Tango.PPC.Common.PPCViewModel" />
    public class JobProgressViewVM : PPCViewModel
    {
        #region Properties

        private Job _job;
        /// <summary>
        /// Gets or sets the job.
        /// </summary>
        public Job Job
        {
            get { return _job; }
            set { _job = value; RaisePropertyChangedAuto(); }
        }

        private RunningJobStatus _runningJobStatus;
        /// <summary>
        /// Gets or sets the running job status.
        /// </summary>
        public RunningJobStatus RunningJobStatus
        {
            get { return _runningJobStatus; }
            set { _runningJobStatus = value; RaisePropertyChangedAuto(); }
        }

        #endregion

        #region Override Methods

        /// <summary>
        /// Called when the application has been started.
        /// </summary>
        public override void OnApplicationStarted()
        {
            MachineProvider.MachineOperator.PrintingStarted += MachineOperator_PrintingStarted;
        }

        /// <summary>
        /// Called when the navigation system has navigated from this VM view.
        /// </summary>
        public override void OnNavigatedFrom()
        {
            base.OnNavigatedFrom();

            if (MachineProvider.MachineOperator.IsPrinting)
            {
                NotificationProvider.PushAppBarItem<JobProgressAppBarItem>().Pressed += (_, __) =>
                {
                    NotificationProvider.CurrentAppBarItem.Close();
                    NavigationManager.NavigateTo<JobsModule>(nameof(JobProgressView));
                };
            }
        }

        /// <summary>
        /// Called when the navigation system has navigated to this VM view.
        /// </summary>
        public override void OnNavigatedTo()
        {
            base.OnNavigatedTo();

            if (NotificationProvider.HasAppBarItem && NotificationProvider.CurrentAppBarItem is JobProgressAppBarItem)
            {
                NotificationProvider.CurrentAppBarItem.Close();
            }
        }

        #endregion

        #region Event Handlers

        /// <summary>
        /// Handles the PrintingStarted event of the MachineOperator.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="PrintingEventArgs"/> instance containing the event data.</param>
        private void MachineOperator_PrintingStarted(object sender, PrintingEventArgs e)
        {
            Job = e.Job;
            e.JobHandler.StatusChanged += JobHandler_StatusChanged;
            e.JobHandler.Stopped += JobHandler_Stopped;
        }

        /// <summary>
        /// Handles the Stopped event of the JobHandler.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
        private void JobHandler_Stopped(object sender, EventArgs e)
        {
            if (NotificationProvider.HasAppBarItem && NotificationProvider.CurrentAppBarItem is JobProgressAppBarItem)
            {
                NotificationProvider.CurrentAppBarItem.Close();
            }
        }

        /// <summary>
        /// Handles the JobHandler StatusChanged event.
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The e.</param>
        private void JobHandler_StatusChanged(object sender, RunningJobStatus e)
        {
            InvokeUI(() =>
            {
                RunningJobStatus = e;
            });
        }

        #endregion
    }
}