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

namespace ST.Library.UI.STTextBox
{
 partial class STTextBox
 {
 private struct ScrollIncrement
 {
 public int Time;
 public int Value;

 public ScrollIncrement(int nTime, int nValue) {
 this.Time = nTime;
 this.Value = nValue;
 }
 }

 private DateTime m_dt_last_scroll_h = DateTime.Now;
 private DateTime m_dt_last_scroll_v = DateTime.Now;
 private ScrollIncrement[] m_arr_si = new ScrollIncrement[]{
 new ScrollIncrement(20, 6),
 new ScrollIncrement(30, 5),
 new ScrollIncrement(40, 4),
 new ScrollIncrement(50, 3),
 new ScrollIncrement(60, 2),
 };

 protected override void OnMouseDown(MouseEventArgs e) {
 base.OnMouseDown(e);
 var c = m_core;
 this.Select();
 if (c.Scroll.HoverScrollBar != STTextBoxScrollInfo.ScrollBarType.None) {
 if (c.Scroll.HBackRect.Contains(e.Location)) {
 c.Scroll.DownScrollBar = STTextBoxScrollInfo.ScrollBarType.H;
 c.ITextView.ScrollXToMuosePoint(e.X);
 this.Invalidate();
 } else if (c.Scroll.VBackRect.Contains(e.Location)) {
 c.Scroll.DownScrollBar = STTextBoxScrollInfo.ScrollBarType.V;
 c.ITextView.ScrollYToMousePoint(e.Y);
 this.Invalidate();
 }
 return;
 }

 var fi = c.ITextView.SetCaretPostion(e.Location);// c.ITextView.FindFromPoint(e.Location);
 //c.Caret.CopyFromFindInfo(fi);
 if (Control.ModifierKeys != Keys.Shift) {
 c.Selection.SetIndex(c.Caret.IndexOfChar);
 } else {
 //if (c.Caret.IndexOfChar < c.Selection.AnchorIndex) {
 // //c.Selection.StartIndex = c.Caret.IndexOfChar;
 // //c.Selection.EndIndex = c.Selection.AnchorIndex;
 // c.Selection.SetSelection(c.Selection.AnchorIndex, c.Caret.IndexOfChar);
 //} else {
 // c.Selection.StartIndex = c.Selection.AnchorIndex;
 // c.Selection.EndIndex = c.Caret.IndexOfChar;
 //}
 c.Selection.SetSelection(c.Selection.AnchorIndex, c.Caret.IndexOfChar);
 }
 //c.ITextView.SetCaretPostion(c.Caret.X, c.Caret.Y);
 this.Invalidate();
 }

 protected override void OnMouseMove(MouseEventArgs e) {
 base.OnMouseMove(e);
 var c = m_core;
 switch (c.Scroll.DownScrollBar) {
 case STTextBoxScrollInfo.ScrollBarType.V:
 c.ITextView.ScrollYToMousePoint(e.Y);
 this.Invalidate();
 return;
 case STTextBoxScrollInfo.ScrollBarType.H:
 c.ITextView.ScrollXToMuosePoint(e.X);
 this.Invalidate();
 return;
 }
 if (e.Button == System.Windows.Forms.MouseButtons.Left) {
 //var sw = new System.Diagnostics.Stopwatch();
 //sw.Start();
 var fi = c.ITextView.FindFromPoint(e.Location);
 if (!fi.Find) return;
 c.Caret.CopyFromFindInfo(fi);
 int nIndex = c.Caret.IndexOfChar;
 //if (nIndex > c.Selection.AnchorIndex) {
 // c.Selection.SetSelection(c.Selection.AnchorIndex, nIndex);
 // //c.Selection.StartIndex = c.Selection.AnchorIndex;
 // //c.Selection.EndIndex = nIndex;
 //} else {
 // c.Selection.SetSelection(nIndex, c.Selection.AnchorIndex);
 // //c.Selection.StartIndex = nIndex;
 // //c.Selection.EndIndex = c.Selection.AnchorIndex;
 //}
 c.Selection.SetSelection(c.Selection.AnchorIndex, nIndex);
 c.ITextView.SetCaretPostion(fi.IndexOfChar);
 c.ITextView.ScrollToCaret();
 //sw.Stop();
 //Console.WriteLine("CheckSelection: - " + sw.ElapsedMilliseconds);
 this.Invalidate();
 return;
 }
 if (e.Button == MouseButtons.None && c.Scroll.CountDown != 0) {
 if (c.Scroll.VBackRect.Contains(e.Location)) {
 c.Scroll.HoverScrollBar = STTextBoxScrollInfo.ScrollBarType.V;
 } else if (c.Scroll.HBackRect.Contains(e.Location)) {
 c.Scroll.HoverScrollBar = STTextBoxScrollInfo.ScrollBarType.H;
 } else {
 c.Scroll.HoverScrollBar = STTextBoxScrollInfo.ScrollBarType.None;
 }
 if (c.Scroll.HoverScrollBar != STTextBoxScrollInfo.ScrollBarType.None) {
 this.ShowScrollBar(c.Scroll.DisplayTime);
 if (this.SetCursor(Cursors.Arrow)) {
 this.Invalidate();
 }
 } else {
 if (this.SetCursor(Cursors.IBeam)) {
 this.Invalidate();
 }
 }
 } else {
 c.ITextView.OnSetCursor(e);
 }
 }

 protected override void OnMouseUp(MouseEventArgs e) {
 base.OnMouseUp(e);
 var c = m_core;
 c.Scroll.DownScrollBar = STTextBoxScrollInfo.ScrollBarType.None;
 this.Invalidate();
 }

 protected override void OnMouseLeave(EventArgs e) {
 base.OnMouseLeave(e);
 var c = m_core;
 c.Scroll.HoverScrollBar = STTextBoxScrollInfo.ScrollBarType.None;
 }

 protected override void OnMouseWheel(MouseEventArgs e) {
 base.OnMouseWheel(e);
 DateTime dt_now = DateTime.Now;
 //Console.WriteLine("Scroll: --------------------- " + dt_now.Subtract(m_dt_last_scroll_v).TotalMilliseconds);
 int nIncrement = 1;
 int nTemp = (int)dt_now.Subtract(m_dt_last_scroll_v).TotalMilliseconds;
 foreach (var v in m_arr_si) {
 if (nTemp < v.Time) {
 nIncrement = v.Value;
 break;
 }
 }
 m_dt_last_scroll_v = dt_now;
 var c = m_core;
 if (e.Delta > 0) {
 if (c.Scroll.YValue <= 0) return;
 if (c.Scroll.YValue - nIncrement < 0) {
 nIncrement = c.Scroll.YValue;
 }
 c.Scroll.YValue -= nIncrement;
 c.Caret.Y += nIncrement * c.LineHeight;// this.Font.Height;
 } else {
 if (c.Scroll.YValue >= c.Scroll.MaxYValue) {
 return;
 }
 if (c.Scroll.YValue + nIncrement > c.Scroll.MaxYValue) {
 nIncrement = c.Scroll.MaxYValue - c.Scroll.YValue;
 }
 c.Scroll.YValue += nIncrement;
 c.Caret.Y -= c.LineHeight * nIncrement;// c.ITextRender.GetFontHeight();
 }
 c.ITextView.SetCaretPostion(c.Caret.IndexOfChar);
 //c.ITextView.SetCaretPostion(c.Caret.X, c.Caret.Y);
 this.ShowScrollBar(c.Scroll.DisplayTime);
 this.Invalidate();
 //c.Scroll.Timer = 5;
 }

 protected virtual void OnMouseHWheel(MouseEventArgs e) {
 DateTime dt_now = DateTime.Now;
 //Console.WriteLine("Scroll: --------------------- " + dt_now.Subtract(m_dt_last_scroll_h).TotalMilliseconds);
 int nIncrement = 1;
 int nTemp = (int)dt_now.Subtract(m_dt_last_scroll_h).TotalMilliseconds;
 foreach (var v in m_arr_si) {
 if (nTemp < v.Time) {
 nIncrement = v.Value;
 break;
 }
 }
 m_dt_last_scroll_h = dt_now;
 var c = m_core;
 if (e.Delta < 0) {
 if (c.Scroll.XValue <= 0) return;
 if (c.Scroll.XValue - nIncrement < 0) {
 nIncrement = c.Scroll.XValue;
 }
 c.Scroll.XValue -= nIncrement;
 c.Caret.X += c.Scroll.XIncrement * nIncrement;
 } else {
 if (c.Scroll.XValue >= c.Scroll.MaxXValue) {
 return;
 }
 if (c.Scroll.XValue + nIncrement > c.Scroll.MaxXValue) {
 nIncrement = c.Scroll.MaxXValue - c.Scroll.XValue;
 }
 c.Scroll.XValue += nIncrement;
 c.Caret.X -= c.Scroll.XIncrement * nIncrement;
 }
 //c.ITextView.SetCaretPostion(c.Caret.X, c.Caret.Y);
 c.ITextView.SetCaretPostion(c.Caret.IndexOfChar);
 this.ShowScrollBar(c.Scroll.DisplayTime);
 this.Invalidate();
 //c.Scroll.Timer = 5;
 }

 protected override void OnMouseDoubleClick(MouseEventArgs e) {
 base.OnMouseDoubleClick(e);
 var c = m_core;
 var fi = c.ITextView.FindFromPoint(e.Location);
 int nIndex = fi.IndexOfChar - fi.Line.IndexOfFirstChar;
 int nSelectionStart = fi.IndexOfChar, nSelectionLen = 0;
 c.IWordSplitter.Each(fi.Line.RawString, (str, nStart, nLen) => {
 if (nIndex >= nStart && nIndex < nStart + nLen) {
 switch (str[nStart]) {
 case '\r':
 case '\n':
 return false;
 }
 nSelectionStart = fi.Line.IndexOfFirstChar + nStart;
 nSelectionLen = nLen;
 return false;
 }
 nSelectionStart = fi.Line.IndexOfFirstChar + nStart;
 nSelectionLen = nLen;
 return true;
 });
 c.Selection.SetSelection(nSelectionStart, nSelectionStart + nSelectionLen);
 c.Caret.IndexOfChar = c.Selection.EndIndex;
 c.ITextView.SetCaretPostion(c.Caret.IndexOfChar);
 this.Invalidate();
 }
 }
}