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using System;
using System.Collections.Generic;
using System.Text;
using XenAdmin.Actions;
using XenAdmin.Dialogs;
using XenAdmin.Dialogs.VMProtection_Recovery;
using XenAdmin.Dialogs.VMAppliances;
using XenAdmin.Network;
using XenAdmin.Wizards;
using XenAdmin.Wizards.NewPolicyWizard;
using XenAdmin.Wizards.NewVMApplianceWizard;

using XenAPI;

namespace XenAdmin.Core
{
    /// <summary>
    /// A helper class for dealing with a group of VMs (currently either a VMPP or a vApp);
    /// it contains all the functions necessary to abstract away what type of group it is.
    /// 
    /// In C++, we would use template specialization for this, but C# generics don't have that, so we
    /// end up switching on T. It's ugly, but it's the way that maximises the amount of shared code.
    /// </summary>

    internal static class VMGroup<T> where T : XenObject<T>
    {
        // This section covers all the functions that depend on the type of group we're talking about.

        internal static T[] GroupsInCache(ICache cache)
        {
            return typeof(T) == typeof(VMPP) ? cache.VMPPs as T[] : cache.VM_appliances as T[];
        }

        internal static XenRef<T> VmToGroup(VM vm)
        {
            return typeof(T) == typeof(VMPP) ? vm.protection_policy as XenRef<T> : vm.appliance as XenRef<T>;
        }

        internal static List<XenRef<VM>> GroupToVMs(T group)
        {
            return typeof(T) == typeof(VMPP) ? (group as VMPP).VMs : (group as VM_appliance).VMs;
        }

        internal static string ChangeOneWarningString
        {
            get { return typeof(T) == typeof(VMPP) ? Messages.CHANGE_VMS_POLICY_WARNING : Messages.CHANGE_VMS_APPLIANCE_WARNING; }
        }

        internal static string ChangeMultipleWarningString
        {
            get { return typeof(T) == typeof(VMPP) ? Messages.CHANGE_VMS_POLICIES_WARNING : Messages.CHANGE_VMS_APPLIANCES_WARNING; }
        }

        internal static string NewGroupString
        {
            get { return typeof(T) == typeof(VMPP) ? Messages.NEW_POLICY : Messages.NEW_VM_APPLIANCE; }
        }

        internal static string ChangeVMsGroupString
        {
            get { return typeof(T) == typeof(VMPP) ? Messages.CHANGE_VMS_POLICY : Messages.CHANGE_VMS_APPLIANCE; }
        }

        internal static string AssignMainMenuString
        {
            get { return typeof(T) == typeof(VMPP) ? Messages.ASSIGN_PROTECTION_POLICY : Messages.ASSIGN_VM_APPLIANCE; }
        }

        internal static string AssignContextMenuString
        {
            get { return typeof(T) == typeof(VMPP) ? Messages.ASSIGN_PROTECTION_POLICY_CONTEXT_MENU : Messages.ASSIGN_VM_APPLIANCE; }
        }

        internal static string ManageMainMenuString
        {
            get { return typeof(T) == typeof(VMPP) ? Messages.VM_PROTECTION_MAIN_MENU : Messages.VM_APPLIANCES_MENU; }
        }

        internal static string ManageContextMenuString
        {
            get { return typeof(T) == typeof(VMPP) ? Messages.VM_PROTECTION_CONTEXT_MENU : Messages.VM_APPLIANCES_MENU; }
        }

        internal static string ChooseVMsPage_Text
        {
            get { return typeof(T) == typeof(VMPP) ? Messages.PROTECTED_VMS : Messages.NEWVMAPPLIANCE_VMSPAGE_TEXT; }
        }

        internal static string ChooseVMsPage_Title
        {
            get { return typeof(T) == typeof(VMPP) ? Messages.PROTECTED_VMS_TITLE : Messages.NEWVMAPPLIANCE_VMSPAGE_TITLE; }
        }

        internal static string ChooseVMsPage_Rubric
        {
            get { return typeof(T) == typeof(VMPP) ? Messages.CHOOSE_VMS_VMPP_RUBRIC : Messages.CHOOSE_VMS_VAPP_RUBRIC; }
        }

        internal static string ChooseVMsPage_CurrentGroup
        {
            get { return typeof(T) == typeof(VMPP) ? Messages.CURRENT_POLICY : Messages.CURRENT_VAPP; }
        }

        internal static string ChooseVMsPage_HelpID
        {
            get { return typeof(T) == typeof(VMPP) ? "VirtualMachines" : "VMs"; }  // these are only different for historical reasons
        }

        internal static string UpsellBlurb
        {
            get { return typeof(T) == typeof(VMPP) ? Messages.UPSELL_BLURB_VM_PROTECTION : Messages.UPSELL_BLURB_VM_APPLIANCES; }
        }

        internal static string UpsellLearnMoreUrl
        {
            get { return typeof(T) == typeof(VMPP) ? InvisibleMessages.UPSELL_LEARNMOREURL_VM_PROTECTION : InvisibleMessages.UPSELL_LEARNMOREURL_VM_APPLIANCES; }
        }

        internal static AsyncAction AssignVMsToGroupAction(T group, List<XenRef<VM>> vms, bool suppressHistory)
        {
            return typeof(T) == typeof(VMPP) ?
                (AsyncAction)(new AssignVMsToPolicyAction(group as VMPP, vms, suppressHistory)) :
                (AsyncAction)(new AssignVMsToVMApplianceAction(group as VM_appliance, vms, suppressHistory));
        }

        internal static AsyncAction RemoveVMsFromGroupAction(T group, List<XenRef<VM>> vms)
        {
            return typeof(T) == typeof(VMPP) ?
                (AsyncAction)(new RemoveVMsFromPolicyAction(group as VMPP, vms)) :
                (AsyncAction)(new RemoveVMsFromVMApplianceAction(group as VM_appliance, vms));
        }

        internal static XenWizardBase NewGroupWizard(Pool pool)
        {
            return typeof(T) == typeof(VMPP) ? (XenWizardBase)(new NewPolicyWizard(pool)) : (XenWizardBase)(new NewVMApplianceWizard(pool));
        }

        internal static XenWizardBase NewGroupWizard(Pool pool, List<VM> vms)
        {
            return typeof(T) == typeof(VMPP) ? (XenWizardBase)(new NewPolicyWizard(pool, vms)) : (XenWizardBase)(new NewVMApplianceWizard(pool, vms));
        }

        internal static XenDialogBase ManageGroupsDialog(Pool pool)
        {
            return typeof(T) == typeof(VMPP) ? (XenDialogBase)(new VMProtectionPoliciesDialog(pool)) : (XenDialogBase)(new VMAppliancesDialog(pool));
        }

        internal static bool FeaturePossible(IXenConnection connection)
        {
            if (typeof(T) == typeof(VMPP) && Helpers.ClearwaterOrGreater(connection))
                return false;

            return typeof(T) == typeof(VMPP) ?
                Registry.VMPRFeatureEnabled :
                true;
        }

        internal static Predicate<Host> FeatureRestricted
        {
            get { return typeof(T) == typeof(VMPP) ? (Predicate<Host>)Host.RestrictVMProtection : (Predicate<Host>)Host.RestrictVMAppliances; }
        }
    }
}