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 * *   Redistributions of source code must retain the above 
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 *     following disclaimer. 
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 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

using XenAdmin.Controls;
using XenAdmin.Core;
using XenAdmin.Network;
using XenAdmin.Wizards.GenericPages;
using XenAdmin.Wizards.ImportWizard.Filters;
using XenAPI;
using XenOvf;
using XenOvf.Definitions;


namespace XenAdmin.Wizards.ImportWizard
{
    class ImportSelectHostPage : SelectMultipleVMDestinationPage
    {
        public EnvelopeType SelectedOvfEnvelope { private get; set; }
        private List<Xen_ConfigurationSettingData_Type> vgpuSettings = new List<Xen_ConfigurationSettingData_Type>();
        private List<Xen_ConfigurationSettingData_Type> hardwarePlatformSettings = new List<Xen_ConfigurationSettingData_Type>();
        private List<Xen_ConfigurationSettingData_Type> vendorDeviceSettings = new List<Xen_ConfigurationSettingData_Type>();

        public event Action<IXenConnection> ConnectionSelectionChanged;

        #region XenTabPage overrides

        /// <summary>
        /// Gets the page's title (headline)
        /// </summary>
        public override string PageTitle { get { return Messages.IMPORT_SELECT_HOST_PAGE_TITLE; } }

		/// <summary>
		/// Gets the page's label in the (left hand side) wizard progress panel
		/// </summary>
		public override string Text { get { return Messages.NEWSR_LOCATION; } }

        protected override bool ImplementsIsDirty()
        {
            return true;
        }

        public override void PageLoaded(PageLoadedDirection direction)
        {
            base.PageLoaded(direction);

            if (direction == PageLoadedDirection.Forward)
            {
                ShowWarning(null);

                vgpuSettings.Clear();
                hardwarePlatformSettings.Clear();
                vendorDeviceSettings.Clear();

                if (SelectedOvfEnvelope != null)
                {
                    foreach (var vsType in ((VirtualSystemCollection_Type)SelectedOvfEnvelope.Item).Content)
                    {
                        var vhs = OVF.FindVirtualHardwareSectionByAffinity(SelectedOvfEnvelope, vsType.id, "xen");
                        var data = vhs.VirtualSystemOtherConfigurationData;
                        if (data == null)
                            continue;

                        foreach (var s in data)
                        {
                            if (s.Name == "vgpu")
                                vgpuSettings.Add(s);
                            else if (s.Name == "hardware_platform_version")
                                hardwarePlatformSettings.Add(s);
                            else if (s.Name == "VM_has_vendor_device")
                                vendorDeviceSettings.Add(s);
                        }
                    }
                }
            }

            PopulateComboBox();
        }

        #endregion

        protected override string InstructionText { get { return Messages.IMPORT_WIZARD_DESTINATION_INSTRUCTIONS; } }

        protected override string TargetServerText { get { return Messages.IMPORT_WIZARD_DESTINATION_DESTINATION; } }

        protected override string TargetServerSelectionIntroText { get { return Messages.IMPORT_WIZARD_DESTINATION_TABLE_INTRO; } }

        protected override void OnChosenItemChanged()
        {
            var warnings = new List<string>();

            if (ChosenItem != null)
            {
                if (!CheckDestinationSupportsVendorDevice())
                {
                    //it shouldn't come to this as the hardware incompatibility filter
                    //will have already caught it but just to be on the safe side
                    if (VmMappings.Count == 1)
                        warnings.Add(Messages.IMPORT_VM_WITH_VENDOR_DEVICE_WARNING_ONE);
                    else if (VmMappings.Count > 1)
                        warnings.Add(Messages.IMPORT_VM_WITH_VENDOR_DEVICE_WARNING_MANY);
                }
                
                if (!CheckRightGpuExists())
                {
                    if (VmMappings.Count == 1)
                        warnings.Add(Messages.IMPORT_VM_WITH_VGPU_WARNING_ONE);
                    else if (VmMappings.Count > 1)
                        warnings.Add(Messages.IMPORT_VM_WITH_VGPU_WARNING_MANY);
                }
            }

            ShowWarning(string.Join("\n", warnings));

            if (ConnectionSelectionChanged != null)
                ConnectionSelectionChanged(ChosenItem != null ? ChosenItem.Connection : null);
        }

        protected override DelayLoadingOptionComboBoxItem CreateDelayLoadingOptionComboBoxItem(IXenObject xenItem)
        {
            var filters = new List<ReasoningFilter>
            {
                new HardwareCompatibilityFilter(xenItem, hardwarePlatformSettings)
            };
            return new DelayLoadingOptionComboBoxItem(xenItem, filters);
        }

        protected override List<ReasoningFilter> CreateTargetServerFilterList(IEnableableXenObjectComboBoxItem item, List<string> vmOpaqueRefs)
        {
            var filters = new List<ReasoningFilter>();

            if (item != null)
                filters.Add(new HardwareCompatibilityFilter(item.Item, hardwarePlatformSettings));

            return filters;
        }

        private bool CheckRightGpuExists()
        {
            foreach (var vgpuSetting in vgpuSettings)
            {
                Match m = XenOvfTransport.Import.VGPU_REGEX.Match(vgpuSetting.Value.Value);
                if (!m.Success)
                    continue;

                var types = m.Groups[1].Value.Split(';');

                var gpuGroup = ChosenItem.Connection.Cache.GPU_groups.FirstOrDefault(g =>
                    g.GPU_types.Length == types.Length &&
                    g.GPU_types.Intersect(types).Count() == types.Length);

                if (gpuGroup == null)
                    return false;

                string vendorName = m.Groups[2].Value;
                string modelName = m.Groups[3].Value;

                var vgpuType = ChosenItem.Connection.Cache.VGPU_types.FirstOrDefault(v =>
                    v.vendor_name == vendorName && v.model_name == modelName);

                if (vgpuType == null)
                    return false;
            }

            return true;
        }

        private bool CheckDestinationSupportsVendorDevice()
        {
            var dundeeOrNewerHosts = Helpers.DundeeOrGreater(ChosenItem.Connection) ? ChosenItem.Connection.Cache.Hosts : new Host[] {};

            foreach (var setting in vendorDeviceSettings)
            {
                bool hasVendorDevice;
                if (!bool.TryParse(setting.Value.Value, out hasVendorDevice))
                    continue;
                
                if (hasVendorDevice && dundeeOrNewerHosts.Length == 0)
                    return false;
            }
            return true;
        }
    }
}