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using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using XenAdmin.Actions;
using XenAdmin.Actions.VMActions;
using XenAdmin.Dialogs;
using XenAPI;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Suspends the selected VMs. Shows a confirmation dialog.
    /// </summary>
    internal class SuspendVMCommand : VMLifeCycleCommand
    {
        /// <summary>
        /// Initializes a new instance of this Command. The parameter-less constructor is required if 
        /// this Command is to be attached to a ToolStrip menu item or button. It should not be used in any other scenario.
        /// </summary>
        public SuspendVMCommand()
        {
        }

        public SuspendVMCommand(IMainWindow mainWindow, IEnumerable<SelectedItem> selection)
            : base(mainWindow, selection)
        {
        }

        public SuspendVMCommand(IMainWindow mainWindow, VM vm)
            : base(mainWindow, vm)
        {
        }

        public SuspendVMCommand(IMainWindow mainWindow, VM vm, Control parent)
            : base(mainWindow, vm, parent)
        {
        }

        protected override bool CanRun(VM vm)
        {
            if (!vm.is_a_template && vm.power_state == vm_power_state.Running && vm.allowed_operations != null && vm.allowed_operations.Contains(vm_operations.suspend))
            {
                return true;
            }
            return false;
        }

        protected override void Run(List<VM> vms)
        {
            RunAction(vms, Messages.ACTION_VMS_SUSPENDING_TITLE, Messages.ACTION_VMS_SUSPENDING_TITLE, Messages.ACTION_VM_SUSPENDED, null);
        }

        public override string MenuText => Messages.MAINWINDOW_SUSPEND;

        public override Image MenuImage => Images.StaticImages._000_paused_h32bit_16;

        public override Image ToolBarImage => Images.StaticImages._000_Paused_h32bit_24;

        public override string ToolBarText => Messages.MAINWINDOW_TOOLBAR_SUSPEND;

        public override string EnabledToolTipText => Messages.MAINWINDOW_TOOLBAR_SUSPENDVM;

        protected override bool ConfirmationRequired => true;

        protected override string ConfirmationDialogTitle
        {
            get
            {
                if (GetSelection().Count == 1)
                {
                    return Messages.CONFIRM_SUSPEND_VM_TITLE;
                }
                return Messages.CONFIRM_SUSPEND_VMS_TITLE;
            }
        }

        protected override string ConfirmationDialogText
        {
            get
            {
                SelectedItemCollection selection = GetSelection();
                if (selection.Count == 1)
                {
                    VM vm = (VM)selection[0].XenObject;
                    return vm.HAIsProtected() ? Messages.HA_CONFIRM_SUSPEND_VM : Messages.CONFIRM_SUSPEND_VM;
                }
                return Messages.CONFIRM_SUSPEND_VMS;
            }
        }

        protected override string ConfirmationDialogHelpId => "WarningVmLifeCycleSuspend";

        protected override CommandErrorDialog GetErrorDialogCore(IDictionary<IXenObject, string> cantRunReasons)
        {
            foreach (VM vm in GetSelection().AsXenObjects<VM>())
            {
                if (!CanRun(vm) && vm.power_state == vm_power_state.Running)
                {
                    return new CommandErrorDialog(Messages.ERROR_DIALOG_SUSPEND_VM_TITLE, Messages.ERROR_DIALOG_SUSPEND_VM_TEXT, cantRunReasons);
                }
            }
            return null;
        }

        public override Keys ShortcutKeys => Keys.Control | Keys.Y;

        public override string ShortcutKeyDisplayString => Messages.MAINWINDOW_CTRL_Y;

        protected override string GetCantRunReasonCore(IXenObject item)
        {
            VM vm = item as VM;
            if (vm == null)
            {
                return base.GetCantRunReasonCore(item);
            }
            if (vm.power_state == vm_power_state.Halted)
            {
                return Messages.VM_SHUT_DOWN;
            }
            if (vm.power_state == vm_power_state.Suspended)
            {
                return Messages.VM_ALREADY_SUSPENDED;
            }

            var noToolsOrDriversReason = GetCantRunNoToolsOrDriversReasonCore(item);
            if (noToolsOrDriversReason != null)
            {
                return noToolsOrDriversReason;
            }

            if (vm.HasGPUPassthrough())
            {
                return Messages.VM_HAS_GPU_PASSTHROUGH;
            }

            return base.GetCantRunReasonCore(item);
        }

        protected override AsyncAction BuildAction(VM vm)
        {
            return new VMSuspendAction(vm);
        }
    }
}