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


namespace XenAdmin.Commands
{
    /// <summary>
    /// Reboots the selected VM. Shows a confirmation dialog.
    /// </summary>
    internal class RebootVMCommand : 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 RebootVMCommand()
        {
        }

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

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

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

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

            if (vm != null && vm.allowed_operations != null && vm.allowed_operations.Contains(vm_operations.clean_reboot) && !vm.is_a_template && !vm.Locked)
            {
                var host = selection[0].HostAncestor;
                if (host != null && host.enabled)
                    return true;

                var connection = selection[0].Connection;
                if (connection == null)
                    return false;

                var hosts = connection.Cache.Hosts;
                if (hosts.Any(h => h != null && h.enabled))
                    return true;
            }
            return false;
        }

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

        public override Image MenuImage => Images.StaticImages._001_Reboot_h32bit_16;

        public override string MenuText => Messages.MAINWINDOW_REBOOT;

        protected override bool ConfirmationRequired => true;

        protected override string ConfirmationDialogTitle =>
            GetSelection().Count == 1 ? Messages.CONFIRM_REBOOT_VM_TITLE : Messages.CONFIRM_REBOOT_VMS_TITLE;

        protected override string ConfirmationDialogText =>
            GetSelection().Count == 1 ? Messages.CONFIRM_REBOOT_VM : Messages.CONFIRM_REBOOT_VMS;

        protected override string ConfirmationDialogHelpId => "WarningVmLifeCycleReboot";

        protected override CommandErrorDialog GetErrorDialogCore(IDictionary<IXenObject, string> cantRunReasons)
        {
            return new CommandErrorDialog(Messages.ERROR_DIALOG_REBOOT_VM_TITLE, Messages.ERROR_DIALOG_REBOOT_VM_TEXT, cantRunReasons);
        }

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

        public override string ShortcutKeyDisplayString => Messages.MAINWINDOW_CTRL_R;

        protected override string GetCantRunReasonCore(IXenObject item)
        {
            VM vm = item as VM;
            if (vm == null)
            {
                return base.GetCantRunReasonCore(item);
            }

            switch (vm.power_state)
            {
                case vm_power_state.Halted:
                    return Messages.VM_SHUT_DOWN;
                case vm_power_state.Paused:
                    return Messages.VM_PAUSED;
                case vm_power_state.Suspended:
                    return Messages.VM_SUSPENDED;
                case vm_power_state.unknown:
                    return base.GetCantRunReasonCore(item);
            }

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

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

        public override string ContextMenuText => Messages.MAINWINDOW_REBOOT_CONTEXT_MENU;
    }
}