/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * 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 copyright
 *       notice, this list of conditions and the 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.
 *     * Neither the name of the OpenSim Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;

namespace OpenSim.GUI
{
    class InputTextBoxControl:System.Windows.Forms.TextBox
    {
        public InputTextBoxControl()
        {
            this.KeyDown += new System.Windows.Forms.KeyEventHandler(TextInputControl_KeyDown);
        }
  
        private List<string> CommandHistory = new List<string>();
        private bool InHistory = false;
        private int HistoryPosition = -1;

        void TextInputControl_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter && InHistory == false)
            {
                CommandHistory.Add(this.Text);
            }

            if (e.KeyCode == Keys.Up || e.KeyCode == Keys.Down)
            {
                // if not inside buffer, enter
                // InBuffer = true
                //Console.WriteLine("History: Check");
                if (InHistory == false)
                {
                    if (this.Text != "")
                    {
                        //Console.WriteLine("History: Add");
                        CommandHistory.Add(this.Text);
                        HistoryPosition = CommandHistory.Count;
                    }
                    else
                    {
                        //HistoryPosition = CommandHistory.Count + 1;
                    }
                    //Console.WriteLine("History: InHistory");
                    InHistory = true;
                }

                if (e.KeyCode == Keys.Up)
                    HistoryPosition -= 1;
                if (e.KeyCode == Keys.Down)
                    HistoryPosition += 1;

                if (HistoryPosition > CommandHistory.Count - 1)
                    HistoryPosition = -1;
                if (HistoryPosition < -1)
                    HistoryPosition = CommandHistory.Count - 1;

                //Console.WriteLine("History: Pos: " + HistoryPosition);
                //Console.WriteLine("History: HaveInHistCount: " + CommandHistory.Count);
                if (CommandHistory.Count != 0)
                {
                    if (HistoryPosition != -1)
                    {
                        //Console.WriteLine("History: Getting");
                        //this.Text = CommandHistory.Item(HistoryPosition);
                        this.Text = CommandHistory[HistoryPosition];
                        this.SelectionStart = this.Text.Length;
                        this.SelectionLength = 0;
                    }
                    else
                    {
                        //Console.WriteLine("History: Nothing");
                        this.Text = "";
                    }
                }
                e.Handled = true;
            }
            else
            {
                InHistory = false;
                HistoryPosition = -1;
            }
        }
    }
}
