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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core.Commands;
using Tango.Core.DI;
using Tango.Integration.Operation;
using Tango.PPC.Common;
using Tango.PPC.Common.Modules;
using Tango.PPC.Common.Navigation;
using Tango.PPC.UI.ViewsContracts;
using Tango.SharedUI;

namespace Tango.PPC.UI.ViewModels
{
    /// <summary>
    /// Represents the layout view containing the main menu and all modules.
    /// </summary>
    /// <seealso cref="Tango.PPC.Common.PPCViewModel{Tango.PPC.UI.ViewsContracts.ILayoutView}" />
    public class LayoutViewVM : PPCViewModel<ILayoutView>
    {
        private JobHandler _jobHandler;

        /// <summary>
        /// Gets or sets the module loader.
        /// </summary>
        [TangoInject]
        public IPPCModuleLoader ModuleLoader { get; set; }

        private bool _isMenuOpened;
        /// <summary>
        /// Gets or sets a value indicating whether the side menu is opened.
        /// </summary>
        public bool IsMenuOpened
        {
            get { return _isMenuOpened; }
            set { _isMenuOpened = value; RaisePropertyChangedAuto(); }
        }

        private bool _isNotificationsOpened;
        /// <summary>
        /// Gets or sets a value indicating whether to display all notifications.
        /// </summary>
        public bool IsNotificationsOpened
        {
            get { return _isNotificationsOpened; }
            set { _isNotificationsOpened = value; RaisePropertyChangedAuto(); }
        }

        /// <summary>
        /// Gets or sets the module navigation command.
        /// </summary>
        public RelayCommand<String> ModuleNavigationCommand { get; set; }

        /// <summary>
        /// Gets or sets the menu or back command.
        /// </summary>
        public RelayCommand MenuOrBackCommand { get; set; }

        /// <summary>
        /// Gets or sets the home command.
        /// </summary>
        public RelayCommand HomeCommand { get; set; }

        /// <summary>
        /// Gets or sets the notifications area pressed command.
        /// </summary>
        public RelayCommand NotificationsAreaPressedCommand { get; set; }

        /// <summary>
        /// Gets or sets the stop printing command.
        /// </summary>
        public RelayCommand StopPrintingCommand { get; set; }

        /// <summary>
        /// Gets or sets the sign-out command.
        /// </summary>
        public RelayCommand SignOutCommand { get; set; }

        /// <summary>
        /// Initializes a new instance of the <see cref="LayoutViewVM"/> class.
        /// </summary>
        public LayoutViewVM()
        {
            ModuleNavigationCommand = new RelayCommand<string>(NavigateToModule);
            HomeCommand = new RelayCommand(NavigateHome);
            MenuOrBackCommand = new RelayCommand(OpenMenuOrNavigateBack);
            NotificationsAreaPressedCommand = new RelayCommand(OpenFirstNotificationOrDisplayAll);

            StopPrintingCommand = new RelayCommand(StopPrinting);
            SignOutCommand = new RelayCommand(SignOut);
        }

        private void StopPrinting()
        {
            if (_jobHandler != null)
            {
                _jobHandler.Cancel();
            }
        }

        /// <summary>
        /// Opens the menu or navigate back.
        /// </summary>
        private void OpenMenuOrNavigateBack()
        {
            if (NavigationManager.CanNavigateBack)
            {
                NavigationManager.NavigateBack();
            }
            else
            {
                IsMenuOpened = true;
            }
        }

        /// <summary>
        /// Handles the module navigation command.
        /// </summary>
        /// <param name="moduleName">Name of the module.</param>
        private void NavigateToModule(string moduleName)
        {
            IsMenuOpened = false;
            NavigationManager.NavigateTo(moduleName);
        }

        /// <summary>
        /// Handles the home command.
        /// </summary>
        private void NavigateHome()
        {
            IsMenuOpened = false;
            NavigationManager.NavigateTo(NavigationView.HomeModule);
        }

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

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

        /// <summary>
        /// Handles the ModulesLoaded event of the ModuleLoader.
        /// </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 ModuleLoader_ModulesLoaded(object sender, EventArgs e)
        {
            View.ApplyModules(ModuleLoader.UserModules);
        }

        /// <summary>
        /// Called when the instance of IPPCView is available.
        /// </summary>
        public override void OnViewAttached()
        {

        }

        /// <summary>
        /// Represents an event that is raised when the sign-out operation is complete.
        /// </summary>
        private void SignOut()
        {
            AuthenticationProvider.LogOut();
            IsMenuOpened = false;
        }

        /// <summary>
        /// Opens the first notification or display all.
        /// </summary>
        private void OpenFirstNotificationOrDisplayAll()
        {
            if (NotificationProvider.NotificationItems.Count == 1)
            {
                //Open first
            }
            else
            {
                IsNotificationsOpened = true;
            }
        }
    }
}
an>== Empty) return this; OffsetChangeMap newMap = new OffsetChangeMap(this.Count); for (int i = this.Count - 1; i >= 0; i--) { OffsetChangeMapEntry entry = this[i]; // swap InsertionLength and RemovalLength newMap.Add(new OffsetChangeMapEntry(entry.Offset, entry.InsertionLength, entry.RemovalLength)); } return newMap; } /// <inheritdoc/> protected override void ClearItems() { CheckFrozen(); base.ClearItems(); } /// <inheritdoc/> protected override void InsertItem(int index, OffsetChangeMapEntry item) { CheckFrozen(); base.InsertItem(index, item); } /// <inheritdoc/> protected override void RemoveItem(int index) { CheckFrozen(); base.RemoveItem(index); } /// <inheritdoc/> protected override void SetItem(int index, OffsetChangeMapEntry item) { CheckFrozen(); base.SetItem(index, item); } void CheckFrozen() { if (isFrozen) throw new InvalidOperationException("This instance is frozen and cannot be modified."); } /// <summary> /// Gets if this instance is frozen. Frozen instances are immutable and thus thread-safe. /// </summary> public bool IsFrozen { get { return isFrozen; } } /// <summary> /// Freezes this instance. /// </summary> public void Freeze() { isFrozen = true; } } /// <summary> /// An entry in the OffsetChangeMap. /// This represents the offset of a document change (either insertion or removal, not both at once). /// </summary> [Serializable] public struct OffsetChangeMapEntry : IEquatable<OffsetChangeMapEntry> { readonly int offset; // MSB: DefaultAnchorMovementIsBeforeInsertion readonly uint insertionLengthWithMovementFlag; // MSB: RemovalNeverCausesAnchorDeletion; other 31 bits: RemovalLength readonly uint removalLengthWithDeletionFlag; /// <summary> /// The offset at which the change occurs. /// </summary> public int Offset { get { return offset; } } /// <summary> /// The number of characters inserted. /// Returns 0 if this entry represents a removal. /// </summary> public int InsertionLength { get { return (int)(insertionLengthWithMovementFlag & 0x7fffffff); } } /// <summary> /// The number of characters removed. /// Returns 0 if this entry represents an insertion. /// </summary> public int RemovalLength { get { return (int)(removalLengthWithDeletionFlag & 0x7fffffff); } } /// <summary> /// Gets whether the removal should not cause any anchor deletions. /// </summary> public bool RemovalNeverCausesAnchorDeletion { get { return (removalLengthWithDeletionFlag & 0x80000000) != 0; } } /// <summary> /// Gets whether default anchor movement causes the anchor to stay in front of the caret. /// </summary> public bool DefaultAnchorMovementIsBeforeInsertion { get { return (insertionLengthWithMovementFlag & 0x80000000) != 0; } } /// <summary> /// Gets the new offset where the specified offset moves after this document change. /// </summary> public int GetNewOffset(int oldOffset, AnchorMovementType movementType) { int insertionLength = this.InsertionLength; int removalLength = this.RemovalLength; if (!(removalLength == 0 && oldOffset == offset)) { // we're getting trouble (both if statements in here would apply) // if there's no removal and we insert at the offset // -> we'd need to disambiguate by movementType, which is handled after the if // offset is before start of change: no movement if (oldOffset <= offset) return oldOffset; // offset is after end of change: movement by normal delta if (oldOffset >= offset + removalLength) return oldOffset + insertionLength - removalLength; } // we reach this point if // a) the oldOffset is inside the deleted segment // b) there was no removal and we insert at the caret position if (movementType == AnchorMovementType.AfterInsertion) return offset + insertionLength; else if (movementType == AnchorMovementType.BeforeInsertion) return offset; else return this.DefaultAnchorMovementIsBeforeInsertion ? offset : offset + insertionLength; } /// <summary> /// Creates a new OffsetChangeMapEntry instance. /// </summary> public OffsetChangeMapEntry(int offset, int removalLength, int insertionLength) { ThrowUtil.CheckNotNegative(offset, "offset"); ThrowUtil.CheckNotNegative(removalLength, "removalLength"); ThrowUtil.CheckNotNegative(insertionLength, "insertionLength"); this.offset = offset; this.removalLengthWithDeletionFlag = (uint)removalLength; this.insertionLengthWithMovementFlag = (uint)insertionLength; } /// <summary> /// Creates a new OffsetChangeMapEntry instance. /// </summary> public OffsetChangeMapEntry(int offset, int removalLength, int insertionLength, bool removalNeverCausesAnchorDeletion, bool defaultAnchorMovementIsBeforeInsertion) : this(offset, removalLength, insertionLength) { if (removalNeverCausesAnchorDeletion) this.removalLengthWithDeletionFlag |= 0x80000000; if (defaultAnchorMovementIsBeforeInsertion) this.insertionLengthWithMovementFlag |= 0x80000000; } /// <inheritdoc/> public override int GetHashCode() { unchecked { return offset + 3559 * (int)insertionLengthWithMovementFlag + 3571 * (int)removalLengthWithDeletionFlag; } } /// <inheritdoc/> public override bool Equals(object obj) { return obj is OffsetChangeMapEntry && this.Equals((OffsetChangeMapEntry)obj); } /// <inheritdoc/> public bool Equals(OffsetChangeMapEntry other) { return offset == other.offset && insertionLengthWithMovementFlag == other.insertionLengthWithMovementFlag && removalLengthWithDeletionFlag == other.removalLengthWithDeletionFlag; } /// <summary> /// Tests the two entries for equality. /// </summary> public static bool operator ==(OffsetChangeMapEntry left, OffsetChangeMapEntry right) { return left.Equals(right); } /// <summary> /// Tests the two entries for inequality. /// </summary> public static bool operator !=(OffsetChangeMapEntry left, OffsetChangeMapEntry right) { return !left.Equals(right); } } }