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using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using XenAdmin.Actions;
using XenAdmin.Core;
using XenAdmin.Properties;
using XenAPI;
using XenAdmin.Dialogs;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Shuts down the selected hosts. Shows a confirmation dialog.
    /// </summary>
    internal class ShutDownHostCommand : Command
    {
        /// <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 ShutDownHostCommand()
        {
        }

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

        public ShutDownHostCommand(IMainWindow mainWindow, Host host, Control parent)
            : base(mainWindow, host)
        {
            SetParent(parent);
        }

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            List<AsyncAction> actions = new List<AsyncAction>();
            foreach (Host host in selection.AsXenObjects<Host>(CanExecute))
            {
                this.MainWindowCommandInterface.CloseActiveWizards(host.Connection);
                ShutdownHostAction action = new ShutdownHostAction(host,AddHostToPoolCommand.NtolDialog);
                action.Completed += e => MainWindowCommandInterface.RequestRefreshTreeView();
                actions.Add(action);
            }
            RunMultipleActions(actions, null, Messages.ACTION_HOSTS_SHUTTING_DOWN, Messages.ACTION_HOSTS_SHUTDOWN, true);
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            return selection.AllItemsAre<Host>() && selection.AtLeastOneXenObjectCan<Host>(CanExecute);
        }

        private static bool CanExecute(Host host)
        {
            return host != null && host.IsLive && !HelpersGUI.HasActiveHostAction(host) ;
        }

        public override string MenuText
        {
            get
            {
                return Messages.MAINWINDOW_SHUTDOWN;
            }
        }

        public override Image MenuImage
        {
            get
            {
                return Resources._001_ShutDown_h32bit_16;
            }
        }

        protected override bool ConfirmationRequired
        {
            get
            {
                return true;
            }
        }

        protected override string ConfirmationDialogTitle
        {
            get
            {
                SelectedItemCollection selection = GetSelection();

                if (selection.Count == 1)
                {
                    return Messages.CONFIRM_SHUTDOWN_SERVER_TITLE;
                }

                return Messages.CONFIRM_SHUTDOWN_SERVERS_TITLE;
            }
        }

        protected override string ConfirmationDialogText
        {
            get
            {
                List<Host> hosts = GetSelection().AsXenObjects<Host>();
                bool hasRunningVMs = false;
                var hciHosts = new List<Host>();

                foreach (Host h in hosts)
                {
                    if (h.HasRunningVMs)
                        hasRunningVMs = true;

                    if (h.Connection.ResolveAll(h.resident_VMs).Exists(v => v.HciWarnBeforeShutdown))
                        hciHosts.Add(h);
                }

                if (hciHosts.Count > 0)
                    return hciHosts.Count == 1
                        ? string.Format(Messages.CONFIRM_SHUTDOWN_HCI_WARN_SERVER, hciHosts[0].Name)
                        : string.Format(Messages.CONFIRM_SHUTDOWN_HCI_WARN_SERVERS, string.Join("\n", hciHosts.Select(h => h.Name)));

                if (hasRunningVMs)
                    return hosts.Count == 1
                        ? string.Format(Messages.CONFIRM_SHUTDOWN_SERVER, hosts[0].Name)
                        : Messages.CONFIRM_SHUTDOWN_SERVERS;

                return hosts.Count == 1
                    ? string.Format(Messages.CONFIRM_SHUTDOWN_SERVER_NO_VMS, hosts[0].Name)
                    : Messages.CONFIRM_SHUTDOWN_SERVERS_NO_VMS;
            }
        }

        protected override CommandErrorDialog GetErrorDialogCore(IDictionary<SelectedItem, string> cantExecuteReasons)
        {
            foreach (Host host in GetSelection().AsXenObjects<Host>())
            {
                if (!CanExecute(host) && host.IsLive)
                {
                    return new CommandErrorDialog(Messages.ERROR_DIALOG_SHUTDOWN_HOST_TITLE, Messages.ERROR_DIALOG_SHUTDOWN_HOST_TEXT, cantExecuteReasons);
                }
            }
            return null;
        }

        protected override string GetCantExecuteReasonCore(SelectedItem item)
        {
            Host host = item.XenObject as Host;
            if (host == null)
            {
                return base.GetCantExecuteReasonCore(item);
            }
            if (!host.IsLive)
            {
                return Messages.HOST_ALREADY_SHUT_DOWN;
            }
            else if (HelpersGUI.HasActiveHostAction(host))
            {
                return Messages.HOST_ACTION_IN_PROGRESS;
            }
            return base.GetCantExecuteReasonCore(item);
        }

        protected override string ConfirmationDialogYesButtonLabel
        {
            get
            {
                return Messages.CONFIRM_SHUTDOWN_SERVER_YES_BUTTON_LABEL;
            }
        }

        protected override bool ConfirmationDialogNoButtonSelected
        {
            get
            {
                return true;
            }
        }
    }
}