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using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using XenAdmin.Dialogs;
using XenAPI;
using XenAdmin.Commands;

namespace XenAdmin.Dialogs
{
    /// <summary>
    /// A confirmation dialog for Commands. Primarily used for displaying the subset of items from the multiple-selection
    /// which are not going to be actioned by the Command.
    /// </summary>
    internal partial class CommandErrorDialog : XenDialogBase
    {
        public enum DialogMode { Close, OKCancel };

        public DialogMode Mode { get; private set; }

        private ListSortDirection m_direction;
        private DataGridViewColumn m_oldSortedColumn;


        /// <summary>
        /// Gets a new <see cref="CommandErrorDialog"/> using the specified parameters.
        /// </summary>
        /// <typeparam name="TXenObject">The type of the xen object.</typeparam>
        /// <param name="title">The title for the confirmation dialog.</param>
        /// <param name="text">The text for the confirmation dialog.</param>
        /// <param name="cantExecuteReasons">A dictionary of names of the objects which will be ignored with assoicated reasons.</param>
        public static CommandErrorDialog Create<TXenObject>(string title, string text, IDictionary<TXenObject, string> cantExecuteReasons) where TXenObject : IXenObject
        {
            Dictionary<SelectedItem, string> d = new Dictionary<SelectedItem, string>();
            foreach (TXenObject x in cantExecuteReasons.Keys)
            {
                d[new SelectedItem(x)] = cantExecuteReasons[x];
            }
            return new CommandErrorDialog(title, text, d);

        }

        /// <summary>
        /// Initializes a new instance of the <see cref="CommandErrorDialog"/> class.
        /// </summary>
        /// <param name="title">The title for the confirmation dialog.</param>
        /// <param name="text">The text for the confirmation dialog.</param>
        /// <param name="cantExecuteReasons">A dictionary of names of the objects which will be ignored with assoicated reasons.</param>
        public CommandErrorDialog(string title, string text, IDictionary<SelectedItem, string> cantExecuteReasons)
            : this(title, text, cantExecuteReasons, DialogMode.Close)
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="CommandErrorDialog"/> class.
        /// </summary>
        /// <param name="title">The title for the confirmation dialog.</param>
        /// <param name="text">The text for the confirmation dialog.</param>
        /// <param name="cantExecuteReasons">A dictionary of names of the objects which will be ignored with assoicated reasons.</param>
        /// <param name="mode">Whether the dialog should show a Close button, or OK and Cancel buttons.</param>
        public CommandErrorDialog(string title, string text, IDictionary<SelectedItem, string> cantExecuteReasons, DialogMode mode)
        {
            Util.ThrowIfParameterNull(cantExecuteReasons, "cantExecuteReasons");
            Util.ThrowIfParameterNull(title, "title");
            Util.ThrowIfParameterNull(text, "text");

            InitializeComponent();
            pbQuestion.Image = SystemIcons.Error.ToBitmap();

            Text = title;
            lblText.Text = text;
            Mode = mode;

            btnCancel.Visible = mode == DialogMode.OKCancel;
            btnOK.Visible = mode == DialogMode.OKCancel;
            btnClose.Visible = mode == DialogMode.Close;

            foreach (SelectedItem selectedItem in cantExecuteReasons.Keys)
            {
                DataGridViewRow row = new DataGridViewRow {Tag = selectedItem.XenObject};
                row.Cells.AddRange(new DataGridViewCell[]
                                       {
                                           new DataGridViewImageCell {Value = Images.GetImage16For(selectedItem.XenObject)},
                                           new DataGridViewTextBoxCell {Value = selectedItem.XenObject.ToString()},
                                           new DataGridViewTextBoxCell {Value = cantExecuteReasons[selectedItem]}
                                       });
                m_dataGridView.Rows.Add(row);
            }

            m_direction = ListSortDirection.Ascending;
            m_oldSortedColumn = colName;
            m_dataGridView.Sort(new RowComparer(colName.Index, m_direction));
        }

        private void btnOK_Click(object sender, EventArgs e)
        {
            DialogResult = DialogResult.OK;
            Close();
        }

        private void btnCancel_Click(object sender, EventArgs e)
        {
            DialogResult = DialogResult.Cancel;
            Close();
        }

        private void m_dataGridView_ColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            if (e.ColumnIndex < colName.Index || e.ColumnIndex > colReason.Index)
                return;

            var newColumn = m_dataGridView.Columns[e.ColumnIndex];

            if (m_oldSortedColumn == null)
            {
                // the DataGridView is not currently sorted
                m_direction = ListSortDirection.Ascending;
                m_oldSortedColumn = newColumn;
            }
            else
            {
                if (m_oldSortedColumn == newColumn)
                {
                    // Sort the same column again, reversing the SortOrder.
                    m_direction = (m_direction == ListSortDirection.Ascending)
                                    ? ListSortDirection.Descending
                                    : ListSortDirection.Ascending;
                }
                else
                {
                    // Sort a new column and remove the SortGlyph from the old column
                    m_direction = ListSortDirection.Ascending;
                    m_oldSortedColumn.HeaderCell.SortGlyphDirection = SortOrder.None;
                    m_oldSortedColumn = newColumn;
                }
            }

            m_dataGridView.Sort(new RowComparer(newColumn.Index, m_direction));
            newColumn.HeaderCell.SortGlyphDirection = m_direction == ListSortDirection.Ascending
                                                          ? SortOrder.Ascending
                                                          : SortOrder.Descending;
        }

        private class RowComparer : IComparer
        {
            private readonly int m_columnIndex;
            private readonly ListSortDirection m_direction;
            private const int COL_NAME = 1;
            private const int COL_REASON = 2;

            public RowComparer(int columnIndex, ListSortDirection direction)
            {
                m_columnIndex = columnIndex;
                m_direction = direction;
            }

            public int Compare(object x, object y)
            {
                var row1 = (DataGridViewRow)x;
                var row2 = (DataGridViewRow)y;

                int result = 0;

                if (m_columnIndex == COL_NAME)
                    result = ((IXenObject)row1.Tag).CompareTo(row2.Tag);
                else if (m_columnIndex == COL_REASON)
                    result = string.Compare(row1.Cells[COL_REASON].Value.ToString(), row2.Cells[COL_REASON].Value.ToString());

                if (m_direction == ListSortDirection.Descending)
                    return -1 * result;

                return result;
            }
        }
    }
}