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


namespace XenAdmin.Commands
{
    /// <summary>
    /// Resumes the selected VMs.
    /// </summary>
    internal class ResumeVMCommand : 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 ResumeVMCommand()
        {
        }

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

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

        }

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

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

        protected override bool CanRun(VM vm)
        {
            ReadOnlyCollection<SelectedItem> selection = GetSelection();

            if (vm != null && !vm.is_a_template && vm.allowed_operations != null && vm.allowed_operations.Contains(vm_operations.resume) && vm.power_state == vm_power_state.Suspended)
            {
                if (Helpers.EnabledTargetExists(selection[0].HostAncestor, selection[0].Connection))
                {
                    return true;
                }
            }
            return false;
        }

        public override string MenuText => Messages.MAINWINDOW_RESUME;

        public override string ContextMenuText => Messages.MAINWINDOW_RESUME_CONTEXT_MENU;

        public override Image MenuImage => Images.StaticImages._000_Resumed_h32bit_16;

        public override Image ToolBarImage => Images.StaticImages._000_Resumed_h32bit_24;

        public override string EnabledToolTipText => Messages.MAINWINDOW_TOOLBAR_RESUMEVM;

        public override string ToolBarText => Messages.MAINWINDOW_TOOLBAR_RESUME;

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

        public override string ShortcutKeyDisplayString => Messages.MAINWINDOW_CTRL_Y;

        public override Keys ShortcutKeys => Keys.Control | Keys.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.Suspended)
            {
                return Messages.VM_NOT_SUSPENDED;
            }

            return GetCantRunNoToolsOrDriversReasonCore(item) ?? base.GetCantRunReasonCore(item);
        }

        protected override AsyncAction BuildAction(VM vm)
        {
            return new VMResumeAction(vm, VMOperationCommand.WarningDialogHAInvalidConfig, VMOperationCommand.StartDiagnosisForm);
        }
    }
}