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 * with or without modification, are permitted provided 
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 * 
 * *   Redistributions of source code must retain the above 
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 *     following disclaimer. 
 * *   Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using XenAdmin.Core;
using XenAPI;
using XenAdmin.Controls;
using XenAdmin.Actions;
using XenAdmin.SettingsPanels;
using System.Drawing;


namespace XenAdmin.Wizards.NewVMWizard
{
    public partial class Page_CloudConfigParameters : XenTabPage, IEditPage
    {
        private VM vmOrTemplate;
        private string existingConfig;

        public Host Affinity { get; set; }

        public Page_CloudConfigParameters()
        {
            InitializeComponent();
        }

        void ConfigDriveTemplateTextBox_TextChanged(object sender, EventArgs e)
        {
            OnPageUpdated();
        }

        public override string Text
        {
            get { return Messages.NEWVMWIZARD_CLOUD_CONFIG_PARAMETERS_PAGE; }
        }

        public string SubText
        {
            get { return IncludeConfigDriveCheckBox.Checked ? Messages.VM_CLOUD_CONFIG_DRIVE_INCLUDED : Messages.VM_CLOUD_CONFIG_DRIVE_NOT_INCLUDED; }
        }

        public Image Image
        {
            get { return Properties.Resources.coreos_globe_icon; }
        }

        public override string PageTitle
        {
            get { return Messages.NEWVMWIZARD_CLOUD_CONFIG_PARAMETERS_PAGE_TITLE; }
        }

        public override string HelpID
        {
            get { return "CloudConfigParameters"; } 
        }

        public override bool EnableNext()
        {
            return true;
        }

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

            if (SelectedTemplate == vmOrTemplate)
                return;

            vmOrTemplate = SelectedTemplate;

            GetCloudConfigParameters();
            ShowHideButtonsAndWarnings(true);
        }

        public VM SelectedTemplate { private get; set; }


        public string ConfigDriveTemplateText
        {
            get
            {
                return IncludeConfigDriveCheckBox.Checked ? ConfigDriveTemplateTextBox.Text.Trim() : string.Empty;
            }
        }

        public override List<KeyValuePair<string, string>> PageSummary
        {
            get
            {
                List<KeyValuePair<string, string>> sum = new List<KeyValuePair<string, string>>();
                sum.Add(new KeyValuePair<string, string>(Messages.NEWVMWIZARD_CLOUD_CONFIG_PARAMETERS_PAGE, SubText));
                return sum;
            }
        }

        private void IncludeConfigDriveCheckBox_CheckedChanged(object sender, EventArgs e)
        {
            ConfigDriveTemplateTextBox.Enabled = IncludeConfigDriveCheckBox.Checked;
        }
        
        private void GetCloudConfigParameters()
        {
            var configDrive = vmOrTemplate.CloudConfigDrive;
            GetCloudConfigParameters(configDrive);
        }
        
        private void GetCloudConfigParameters(VDI configDrive)
        {
            var defaultConfig = configDrive == null;
            var parameters = new Dictionary<string, string>();
            if (defaultConfig)
                parameters.Add("templateuuid", vmOrTemplate.uuid);
            else
                parameters.Add("vdiuuid", configDrive.uuid);
            
            var action = new ExecutePluginAction(Connection, Affinity ?? Helpers.GetMaster(Connection),
                        "xscontainer",//plugin
                        defaultConfig ? "get_config_drive_default" : "get_config_drive_configuration",//function
                        parameters,
                        true); //hidefromlogs

            action.RunExternal(Connection.Session);
            var result = action.Result.Replace("\n", Environment.NewLine);

            ConfigDriveTemplateTextBox.Text = result;
            existingConfig = result;
        }

        private void GetDefaultParameters()
        {
            GetCloudConfigParameters(null);
        }

        public void ShowHideButtonsAndWarnings(bool inNewVmWizard)
        {
            // IncludeConfigDriveCheckBox and reloadDefaults only visible in the New VM Wizard
            IncludeConfigDriveCheckBox.Visible = reloadDefaults.Visible = inNewVmWizard;

            // the cloud config cannot be edited on non-halted VMs
            bool canEdit = inNewVmWizard || vmOrTemplate.is_a_template ||
                           vmOrTemplate.power_state == vm_power_state.Halted;

            ConfigDriveTemplateLabel.Enabled = ConfigDriveTemplateTextBox.Enabled = canEdit;
            warningsTable.Visible = !canEdit;
        }

        private void reloadDefaults_Click(object sender, EventArgs e)
        {
            GetDefaultParameters();
        }

        #region Implementation of IEditPage

        public AsyncAction SaveSettings()
        {
            var configDrive = vmOrTemplate.CloudConfigDrive;
            if (configDrive == null || string.IsNullOrEmpty(ConfigDriveTemplateText))
                return null;
            
            SR sr = vmOrTemplate.Connection.Resolve(configDrive.SR);
            if (sr == null)
                return null;

            var parameters = new Dictionary<string, string>();
            parameters.Add("vmuuid", vmOrTemplate.uuid);
            parameters.Add("sruuid", sr.uuid);
            parameters.Add("configuration", ConfigDriveTemplateText.Replace("\r\n", "\n"));

            return new ExecutePluginAction(Connection, vmOrTemplate.Home() ?? Helpers.GetMaster(Connection),
                                           "xscontainer", //plugin
                                           "create_config_drive", //function
                                           parameters,
                                           true); //hidefromlogs
        }

        public void SetXenObjects(IXenObject orig, IXenObject clone)
        {
            vmOrTemplate = (VM)clone;

            if (Connection == null) // on the PropertiesDialog
                Connection = vmOrTemplate.Connection;

            GetCloudConfigParameters();
            ShowHideButtonsAndWarnings(false);
        }

        public bool ValidToSave
        {
            get { return true; }
        }

        public void ShowLocalValidationMessages()
        {
        }

        public void Cleanup()
        {
        }

        public bool HasChanged
        {
            get { return existingConfig != ConfigDriveTemplateText; }
        }

        #endregion
    }
}