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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. 
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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.Windows.Forms;
using XenAdmin.Controls;
using XenAPI;
using XenAdmin.Actions;
using XenAdmin.Help;
using System.Linq;
using System.Globalization;
using XenAdmin.Core;

namespace XenAdmin.Wizards.NewSRWizard_Pages.Frontends
{
    public partial class StorageProvisioning : XenTabPage
    {
        private string previousUnitsValueInitAlloc;
        private string previousUnitsValueIncrAlloc;
        private const int DecimalPlacesMB = 0;
        private const int DecimalPlacesGB = 3;
        private const int IncrementMB = 256;
        private const int IncrementGB = 1;

        public StorageProvisioning()
        {
            InitializeComponent();
            incremental_allocation_units.SelectedItem = previousUnitsValueIncrAlloc = Messages.VAL_MEGB;
            initial_allocation_units.SelectedItem = previousUnitsValueInitAlloc = Messages.VAL_MEGB;
        }

        #region Accessors



        public Dictionary<string, string> SMConfig
        {
            get
            {
                var smconfig = new Dictionary<string, string>();

                if (radioButtonThinProvisioning.Checked)
                {
                    smconfig["allocation"] = "xlvhd";
                    smconfig["allocation_quantum"] = (incremental_allocation_units.SelectedItem.ToString() == Messages.VAL_MEGB ? (long)(allocationQuantumNumericUpDown.Value * Util.BINARY_MEGA)
                                                                                                                                : (long)(allocationQuantumNumericUpDown.Value * Util.BINARY_GIGA))
                                                                                                                                .ToString(CultureInfo.InvariantCulture);
                    smconfig["initial_allocation"] = (initial_allocation_units.SelectedItem.ToString() == Messages.VAL_MEGB ? (long)(initialAllocationNumericUpDown.Value * Util.BINARY_MEGA)
                                                                                                                            : (long)(initialAllocationNumericUpDown.Value * Util.BINARY_GIGA))
                                                                                                                            .ToString(CultureInfo.InvariantCulture); 
                }

                return smconfig;
            }
        }

        public long SRSize { get; set; }

        #endregion



        #region XenTabPage overrides

        public override void PopulatePage()
        {
            InitializeNumericUpDowns();

            UpdateControls();

            OnPageUpdated();
        }

        private void InitializeNumericUpDowns()
        {
            // Because we do not initialize the NumericUpDown with values from an existing sm_config
            // the value passed to the setup functions is -1. 
            SetUpInitAllocationNumericUpDown(-1);
            SetUpIncrAllocationNumericUpDown(-1);
        }

        private void SetNumUpDownIncrementAndDecimals(NumericUpDown upDown, string units)
        {
            if (units == Messages.VAL_GIGB)
            {
                upDown.DecimalPlaces = DecimalPlacesGB;
                upDown.Increment = IncrementGB;
            }
            else
            {
                upDown.DecimalPlaces = DecimalPlacesMB;
                upDown.Increment = IncrementMB;
            }
        }    


        // The value parameter is -1 if we do not use an existing SM Config. Otherwise  
        // it is the value of the initial_allocation in the SM config. The value received is in bytes.
        private void SetUpInitAllocationNumericUpDown(decimal value)
        {
            Helpers.AllocationBounds allocBounds = Helpers.SRInitialAllocationBounds(SRSize);

            if(value != -1)
            {
                allocBounds = new Helpers.AllocationBounds(allocBounds.Min, allocBounds.Max, value);                
            }
            initialAllocationNumericUpDown.Minimum = allocBounds.MinInUnits;
            initialAllocationNumericUpDown.Maximum = allocBounds.MaxInUnits;
            initialAllocationNumericUpDown.Value = allocBounds.DefaultValueInUnits;
            
            initial_allocation_units.SelectedItem = previousUnitsValueInitAlloc = allocBounds.Unit;
            SetNumUpDownIncrementAndDecimals(initialAllocationNumericUpDown, allocBounds.Unit);
        }

        // The value parameter is -1 if we do not use an existing SM Config. Otherwise  
        // it is the value of the allocation_quantum in the SM config. 
        private void SetUpIncrAllocationNumericUpDown(decimal value)
        {
            Helpers.AllocationBounds allocBounds = Helpers.SRIncrementalAllocationBounds(SRSize);
            if (value != -1)
            {
                allocBounds = new Helpers.AllocationBounds(allocBounds.Min, allocBounds.Max, value);                        
            }
            allocationQuantumNumericUpDown.Minimum = allocBounds.MinInUnits;
            allocationQuantumNumericUpDown.Maximum = allocBounds.MaxInUnits;
            allocationQuantumNumericUpDown.Value = allocBounds.DefaultValueInUnits;             

            incremental_allocation_units.SelectedItem = previousUnitsValueInitAlloc = allocBounds.Unit;
            SetNumUpDownIncrementAndDecimals(allocationQuantumNumericUpDown, allocBounds.Unit);
        }

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

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

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

        public override bool EnableNext()
        {
            return true;
        }

        #endregion

        private void radioButton_CheckedChanged(object sender, EventArgs e)
        {
            UpdateControls();

        }

        public void DisableControls()
        {
            foreach (Control c in Controls)
                c.Enabled = false;
        }

        public void ResetControls()
        {
            foreach (Control c in Controls)
                c.Enabled = true;

            UpdateControls();
        }

        public void SetControlsUsingExistingSMConfig(Dictionary<string, string> smConfig)
        {
            long temp = 0;

            if (smConfig.ContainsKey("allocation") && smConfig["allocation"] == "xlvhd")
            {
                radioButtonThickProvisioning.Checked = false;
                radioButtonThinProvisioning.Checked = true;

                if (smConfig.ContainsKey("initial_allocation") && long.TryParse(smConfig["initial_allocation"], out temp))
                {
                    SetUpInitAllocationNumericUpDown(temp);
                }

                if (smConfig.ContainsKey("allocation_quantum") && long.TryParse(smConfig["allocation_quantum"], out temp))
                {
                    SetUpIncrAllocationNumericUpDown(temp);
                }
            }
            else
            {
                radioButtonThickProvisioning.Checked = true;
                radioButtonThinProvisioning.Checked = false;
                initialAllocationNumericUpDown.ResetText();
                allocationQuantumNumericUpDown.ResetText();
            }
        }

        private void UpdateControls()
        {
            labelAllocationQuantum.Enabled =
            labelInitialAllocation.Enabled =
            allocationQuantumNumericUpDown.Enabled =
            initial_allocation_units.Enabled =
            incremental_allocation_units.Enabled =
            initialAllocationNumericUpDown.Enabled = radioButtonThinProvisioning.Checked;
        }

        private void initial_allocation_units_SelectedIndexChanged(object sender, EventArgs e)
        {
            UpdateValuesWhenUnitsChanged(initialAllocationNumericUpDown, 
                                         previousUnitsValueInitAlloc, 
                                         initial_allocation_units.SelectedItem.ToString());
            previousUnitsValueInitAlloc = initial_allocation_units.SelectedItem.ToString();
        }

        private void incremental_allocation_units_SelectedIndexChanged(object sender, EventArgs e)
        {
            UpdateValuesWhenUnitsChanged(allocationQuantumNumericUpDown,
                                         previousUnitsValueIncrAlloc,
                                         incremental_allocation_units.SelectedItem.ToString());
            previousUnitsValueIncrAlloc = incremental_allocation_units.SelectedItem.ToString(); 
        }

        public static void UpdateValuesWhenUnitsChanged(NumericUpDown upDown, string previousUnits, string newUnits)
        {
            if (previousUnits == newUnits)
                return;

            if (newUnits == Messages.VAL_MEGB)
            {                
                upDown.Maximum *= Util.BINARY_KILO;
                upDown.Value *= Util.BINARY_KILO;
                upDown.Minimum *= Util.BINARY_KILO;
                upDown.DecimalPlaces = DecimalPlacesMB;
                upDown.Increment = IncrementMB;
            }
            else
            {
                upDown.Minimum /= Util.BINARY_KILO;
                upDown.Value /= Util.BINARY_KILO;
                upDown.Maximum /= Util.BINARY_KILO;
                upDown.DecimalPlaces = DecimalPlacesGB;
                upDown.Increment = IncrementGB;
            }            
        }
    }
}