/* Copyright (c) Citrix Systems Inc. 
 * All rights reserved. 
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met: 
 * 
 * *   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 
 *     materials provided with the distribution. 
 * 
 * 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.Drawing;
using System.Windows.Forms;
using XenAdmin.Actions;
using XenAdmin.Controls;
using XenAdmin.Wizards.NewPolicyWizard;
using XenAPI;
using System.ComponentModel;
using System.Threading;
using System.Diagnostics;
using XenAdmin.Core;
using XenAdmin.Dialogs.VMProtectionRecovery;
using XenCenterLib;


namespace XenAdmin.Dialogs.VMProtection_Recovery
{
    public partial class VMProtectionPoliciesDialog : XenDialogBase
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        public readonly Pool Pool;
        public VMProtectionPoliciesDialog(Pool pool)
        {
            Pool = pool;
            InitializeComponent();
            RefreshPoolTitle(pool);
            localServerTime1.Pool = pool;
            chevronButton1.Text = Messages.SHOW_RUN_HISTORY;
            chevronButton1.Image = Properties.Resources.PDChevronDown;
            policyHistory1.Visible = false;
            SetupDeprecationBanner();
        }

        private void RefreshPoolTitle(Pool pool)
        {
            int protectedVMs = 0;
            int realVMs = 0;
            foreach (var vm in pool.Connection.Cache.VMs)
            {
                if (vm.is_a_real_vm && vm.Show(Properties.Settings.Default.ShowHiddenVMs))
                {
                    realVMs++;
                    if (vm.Connection.Resolve(vm.protection_policy) != null)
                        protectedVMs++;
                }
            }
            labelPolicyTitle.Text = string.Format(Helpers.IsPool(pool.Connection)
                                                      ? Messages.SCHEDULED_SNAPSHOTS_DEFINED_FOR_POOL
                                                      : Messages.SCHEDULED_SNAPSHOTS_DEFINED_FOR_SERVER,
                                                  pool.Name.Ellipsise(45), protectedVMs, realVMs);
        }
      
        void VMPPCollectionChanged(object sender, EventArgs e)
        {
            LoadPolicies();
        }

        private void LoadPolicies()
        {
            dataGridView1.SuspendLayout();
            var selectedVMPP = currentSelected;
            dataGridView1.Rows.Clear();
            foreach (var policy in Pool.Connection.Cache.VMPPs)
            {
                if (dataGridView1.ColumnCount > 0)
                    dataGridView1.Rows.Add(new PolicyRow(policy));
            }
            RefreshButtons();
            if (selectedVMPP != null)
            {
                foreach (PolicyRow row in dataGridView1.Rows)
                {
                    if (row.VMPP.uuid == selectedVMPP.uuid)
                    {
                        dataGridView1.ClearSelection();
                        row.Selected = true;
                        break;
                    }
                }
            }
            RefreshPoolTitle(Pool);
            dataGridView1.ResumeLayout();
        }

        private class PolicyRow : DataGridViewRow
        {
            private DataGridViewTextBoxCell _name = new DataGridViewTextBoxCell();
            private DataGridViewTextBoxCell _numVMs = new DataGridViewTextBoxCell();
            private DataGridViewTextBoxCell _nextRunTime = new DataGridViewTextBoxCell();
            private DataGridViewTextBoxCell _status = new DataGridViewTextBoxCell();
            private DataGridViewTextBoxCell _nextArchiveRuntime = new DataGridViewTextBoxCell();
            private DataGridViewTextAndImageCell _lastResult = new DataGridViewTextAndImageCell();
            public readonly VMPP VMPP;
            public PolicyRow(VMPP policy)
            {
                Cells.Add(_name);
                Cells.Add(_status);
                Cells.Add(_numVMs);
                Cells.Add(_nextRunTime);
                Cells.Add(_nextArchiveRuntime);
                Cells.Add(_lastResult);
                VMPP = policy;
                RefreshRow();
            }

            private DateTime? GetVMPPDateTime(Func<DateTime> getDateTimeFunc)
            {
                try
                {
                    return getDateTimeFunc();
                }
                catch (Exception e)
                {
                    log.Error("An error occurred while obtaining VMPP date time: ", e);
                    return null;
                }
            }

            private void RefreshRow()
            {
                _name.Value = VMPP.Name;
                _numVMs.Value = VMPP.VMs.FindAll(vm => VMPP.Connection.Resolve(vm).is_a_real_vm).Count;
                _status.Value = VMPP.is_policy_enabled ? Messages.ENABLED : Messages.DISABLED;
                if (VMPP.is_backup_running)
                    _status.Value = Messages.RUNNING_SNAPSHOTS;
                if (VMPP.is_archive_running)
                    _status.Value = Messages.RUNNING_ARCHIVE;
                _lastResult.Value = VMPP.LastResult;
                if (VMPP.LastResult == Messages.FAILED)
                    _lastResult.Image = Properties.Resources._075_WarningRound_h32bit_16;
                else if (VMPP.LastResult == Messages.NOT_YET_RUN)
                    _lastResult.Image = null;
                else
                    _lastResult.Image = Properties.Resources._075_TickRound_h32bit_16;

                DateTime? nextRunTime = GetVMPPDateTime(() => VMPP.GetNextRunTime());
                _nextRunTime.Value = nextRunTime.HasValue
                                         ? HelpersGUI.DateTimeToString(nextRunTime.Value, Messages.DATEFORMAT_DMY_HM,
                                                                       true)
                                         : Messages.VM_PROTECTION_POLICY_HOST_NOT_LIVE;

                DateTime? nextArchiveRuntime = GetVMPPDateTime(() => VMPP.GetNextArchiveRunTime());
                _nextArchiveRuntime.Value = nextArchiveRuntime.HasValue
                                                ? nextArchiveRuntime == DateTime.MinValue
                                                      ? Messages.NEVER
                                                      : HelpersGUI.DateTimeToString(nextArchiveRuntime.Value,
                                                                                    Messages.DATEFORMAT_DMY_HM, true)
                                                : Messages.VM_PROTECTION_POLICY_HOST_NOT_LIVE;
            }
        }

        private void buttonNew_Click(object sender, System.EventArgs e)
        {
            new NewPolicyWizard(Pool).Show(this);
        }

        private void buttonCancel_Click(object sender, System.EventArgs e)
        {
            this.Close();
        }

        private void VMProtectionPoliciesDialog_Load(object sender, EventArgs e)
        {
            LoadPolicies();
            localServerTime1.GetServerTime();
            Pool.Connection.Cache.RegisterBatchCollectionChanged<VMPP>(VMPPCollectionChanged);
        }

        private void buttonDelete_Click(object sender, EventArgs e)
        {
            var selectedPolicies = new List<VMPP>();
            int numberOfProtectedVMs = 0;
            foreach (DataGridViewRow row in dataGridView1.SelectedRows)
            {
                var policy = ((PolicyRow)row).VMPP;
                selectedPolicies.Add(policy);
                numberOfProtectedVMs += policy.VMs.Count;

            }
            string text = "";
            if (selectedPolicies.Count == 1)
            {
                text = String.Format(numberOfProtectedVMs == 0 ? Messages.CONFIRM_DELETE_POLICY_0 : Messages.CONFIRM_DELETE_POLICY, selectedPolicies[0].Name, numberOfProtectedVMs);
            }
            else
            {
                text = string.Format(numberOfProtectedVMs == 0 ? Messages.CONFIRM_DELETE_POLICIES_0 : Messages.CONFIRM_DELETE_POLICIES, numberOfProtectedVMs);
            }

            if (new ThreeButtonDialog(
                    new ThreeButtonDialog.Details(SystemIcons.Warning, text, Messages.DELETE_VM_PROTECTION_TITLE),
                    ThreeButtonDialog.ButtonYes,
                    ThreeButtonDialog.ButtonNo).ShowDialog(this) == DialogResult.Yes)

                new DestroyPolicyAction(Pool.Connection, selectedPolicies).RunAsync();

        }

        private VMPP currentSelected = null;

        private void dataGridView1_SelectionChanged(object sender, EventArgs e)
        {
            RefreshButtons();
        }

        private void RefreshButtons()
        {
            if (dataGridView1.SelectedRows.Count == 1)
            {
                currentSelected = (VMPP)((PolicyRow)dataGridView1.SelectedRows[0]).VMPP;
                buttonEnable.Text = currentSelected.is_policy_enabled ? Messages.DISABLE : Messages.ENABLE;
                buttonEnable.Enabled = currentSelected.VMs.Count == 0 && !currentSelected.is_policy_enabled ? false : true;
                buttonProperties.Enabled = true;
                buttonRunNow.Enabled = currentSelected.is_policy_enabled && !currentSelected.is_backup_running && !currentSelected.is_archive_running;

            }
            else
            {
                currentSelected = null;
                buttonProperties.Enabled = buttonEnable.Enabled = buttonRunNow.Enabled = false;
                policyHistory1.Clear();
            }
            policyHistory1.RefreshTab(currentSelected);
            buttonDelete.Enabled = (dataGridView1.SelectedRows.Count != 0);
        }

        private void VMProtectionPoliciesDialog_FormClosed(object sender, FormClosedEventArgs e)
        {
            Pool.Connection.Cache.DeregisterBatchCollectionChanged<VMPP>(VMPPCollectionChanged);
        }

        private void buttonEnable_Click(object sender, EventArgs e)
        {
            if (currentSelected != null)
            {
                var action = new ChangePolicyEnabledAction(currentSelected);
                action.RunAsync();
            }
        }


        private void button1_Click(object sender, EventArgs e)
        {
            if (dataGridView1.SelectedRows.Count == 1)
            {
                var vmpp = ((PolicyRow)dataGridView1.SelectedRows[0]).VMPP;
                var action = new RunPolicyNowAction(vmpp);
                action.Completed += action_Completed;
                buttonRunNow.Enabled = false;
                action.RunAsync();
            }
        }

        void action_Completed(ActionBase sender)
        {
            Program.Invoke(Program.MainWindow, RefreshButtons);
        }

        private void SetupDeprecationBanner()
        {
            if(deprecationBanner != null && !Helpers.ClearwaterOrGreater(Pool.Connection))
            {
                deprecationBanner.AppliesToVersion = Messages.XENSERVER_6_2;
                deprecationBanner.BannerType = DeprecationBanner.Type.Removal;
                deprecationBanner.FeatureName = Messages.VMPP;
                deprecationBanner.LinkUri = new Uri(InvisibleMessages.VMPR_DEPRECATION_URL);
                deprecationBanner.Visible = true;
            }
        }

        private void buttonProperties_Click(object sender, EventArgs e)
        {
            using (PropertiesDialog propertiesDialog = new PropertiesDialog(currentSelected))
            {
                propertiesDialog.ShowDialog(this);
            }
        }


        private void chevronButton1_ButtonClick(object sender, EventArgs e)
        {
            if (chevronButton1.Text == Messages.HIDE_RUN_HISTORY)
            {
                chevronButton1.Text=Messages.SHOW_RUN_HISTORY;
                chevronButton1.Image=Properties.Resources.PDChevronDown;
                policyHistory1.Visible = false;
            }
            else
            {
                chevronButton1.Text=Messages.HIDE_RUN_HISTORY;
                chevronButton1.Image=Properties.Resources.PDChevronUp;
                policyHistory1.Visible = true;
            }
        }

        private void chevronButton1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter || e.KeyCode == Keys.Space)
                chevronButton1_ButtonClick(sender, e);
        }
    }


}