using System;
using System.Collections.Generic;
using System.Text;
using VEPROMS.CSLA.Library;
using Volian.Base.Library;
using iTextSharp.text.pdf;
using Volian.Svg.Library;

namespace Volian.Print.Library
{
	public partial class vlnParagraph
	{
		/// <summary>
		/// This variable is used to match 16 bit pagination
		/// </summary>
		private bool _Match16BitPagination = false;
		/// <summary>
		/// Dtermines if the current step is preceded by a Page Break
		/// </summary>
		/// <param name="yLocation"></param>
		/// <param name="yTopMargin"></param>
		/// <param name="yBottomMargin"></param>
		/// <returns>
		/// 0 - No page break
		/// 1 - Break on High Level Step
		/// 2 - Break within a Step
		/// 3 - Break on High Level Step (SevenLinesPerInch)
		/// </returns>
		private int Paginate(float yLocation, float yTopMargin, float yBottomMargin)
		{
			float yPageSize = yTopMargin - yBottomMargin;
			// TODO: This does not account for a long step as the last step that would exceed more than one page and
			// that has an end message that needs to be accounted for in determining pagination.  To do that the last
			// child should be the only paragraph that accounts for the End message.
			//
			// If last step & there should be an end message, pagination tests need to account for the 3 lines the end
			// message uses. The 3 is for a line above, the end message line & the line below (in case there is a border/box line).

			// The 3 was changed to 2 for the end line & the line below. The blank line below the step gives the blank
			// line above the end message, thus 2 not 3. This change was made on July 20, 2011 by RHM & KBR. The 
			// procedure in questions was VEWCNEMG\EMGAPP.PRC, ES-01, Step 8. 
			bool ManualPageBreak = false;
			float yEndMsg = !MyItemInfo.IsSection && MyItemInfo.MyHLS.NextItem == null && (MyItemInfo.MyDocStyle.End.Message ?? "") != "" ? 2 * SixLinesPerInch : 0;
			float yWithinMargins = CalculateYLocation(yLocation, yTopMargin) - yBottomMargin; // -SixLinesPerInch;
			// if step is breaking over a number of pages, determine if the current step is the
			// location of a pagebreak.
			if (MyItemInfo.ItemID == 54 || MyItemInfo.ItemID == 54) Console.WriteLine("here");
			if (MyPageHelper.ParaBreaks.Count > 0)
			{
				if (this == MyPageHelper.ParaBreaks[0] || this.YTopMost > MyPageHelper.ParaBreaks[0].YTopMost)
				{
					MyPageHelper.ParaBreaks.RemoveAt(0);
					//Console.WriteLine("'PageBreak',6,'Yes','Page Break within Step',{0},{1},{2},{3}, {4},'{5}'", MyItemInfo.ItemID, YSize, 0, 0, 0, MyItemInfo.ShortPath);
					//Console.WriteLine("Prev = {0}", MyItemInfo.MyPrevious==null ? "''" : MyItemInfo.DBSequence);
					ShowPageBreak(1, "Page Break within Step", "Yes", YSize, yPageSize, yWithinMargins, ManualPageBreak);
					return 2;		// break on this item within a step
				}
				return 0;			// this is not an item with a break
			}
			float mySize = YSize * MyPageHelper.YMultiplier;
			vlnParagraph firstChild =  ChildrenBelow.Count > 0 ? ChildrenBelow[0] : null;
			float ySizeIncludingFirst = firstChild == null ? YSize : firstChild.YSize + (firstChild.YTopMost - YTopMost);
			bool KeepStepsOnPage = MyItemInfo.ActiveFormat.MyStepSectionLayoutData.KeepStepsOnPage;
			if (MyItemInfo.IsStepSection)
			{
				if (yLocation < yTopMargin)  // continuous section
				{
					if (ChildrenBelow == null || ChildrenBelow.Count == 0)
					{
						// see if there is an end message.  This is stored in the helper - if there is,
						// we need to be sure that there is room for it.
						if (MyPageHelper.BottomMessage != null)
						{
							if (mySize + yEndMsg <= yWithinMargins) return 1;
						}
						return 0;
					}

					// This is a continuous section.  There may be cases where the user put a manual page
					// break on the first step (child) in the section. if so, break on the section.  The
					// flag SectionPageBreak is set to true to flag that a pagebreak should not be done
					// on that first step.
					StepConfig sc = firstChild.MyItemInfo.MyConfig as StepConfig;
					ManualPageBreak = MyPageHelper.OriginalPageBreak ? (sc == null ? false : sc.Step_ManualPagebreak) :
						sc == null ? false : sc.Step_NewManualPagebreak;
					if (ManualPageBreak)
					{
						SectionPageBreak = true;
						ShowPageBreak(2, "Section Page Break", "Yes", YSize, yPageSize, yWithinMargins, ManualPageBreak);
						return 1;
					}
					// can the title and the first step fit?
					// add the first child's size + (the section title's size)
					//if (ySizeIncludingFirst > (yLocation - yBottomMargin - SixLinesPerInch)) return 1;
					//if (ySizeIncludingFirst > (yLocation - yBottomMargin) && ySizeIncludingFirst < yPageSize)
					vlnParagraph firstStepChild = firstChild;
					//while (firstStepChild.MyItemInfo.IsSection && firstStepChild.ChildrenBelow.Count > 0) firstStepChild = firstStepChild.ChildrenBelow[0];
					while (firstStepChild.ChildrenBelow.Count > 0 && (firstStepChild.MyItemInfo.IsSection || firstStepChild.MyItemInfo.IsHigh)) firstStepChild = firstStepChild.ChildrenBelow[0];
					float ySizeIncludingFirstStep = firstStepChild.YSize + (firstStepChild.YTopMost - YTopMost);
					bool isFirstSection = MyItemInfo.MyPrevious == null;
					bool nearTheTop = yWithinMargins > (yPageSize - 5 * SixLinesPerInch);
					bool firstSubstepExceedsSpaceAvailable = ySizeIncludingFirstStep > yWithinMargins;
					if (KeepStepsOnPage && firstSubstepExceedsSpaceAvailable && !isFirstSection)
						KeepStepsOnPage = false;
					if (!KeepStepsOnPage && ySizeIncludingFirst > (yLocation - yBottomMargin))
					{
						ShowPageBreak(4, "Page Break Before Continuous Step Section", "Yes", YSize, yPageSize, yWithinMargins, ManualPageBreak);
						return 1;
					}
				}
				return 0; // Don't Paginate (page break) on a Step Section if it's first thing on page
			}
			if (!MyItemInfo.IsHigh) return 0;		// Don't Paginate on a Substep level
			StepConfig sc1 = MyItemInfo.MyConfig as StepConfig;
			ManualPageBreak = MyPageHelper.OriginalPageBreak ? (sc1 == null ? false : sc1.Step_ManualPagebreak) :
				sc1 == null ? false : sc1.Step_NewManualPagebreak;
			if (MyItemInfo.FirstSibling == MyItemInfo && ManualPageBreak)
			{
				// if parent/section used this pagebreak, skip it.
				if (MyParent.SectionPageBreak)
				{
					ManualPageBreak = false;
					MyParent.SectionPageBreak = false;
				}
			}
			if (_Match16BitPagination) mySize = YSize;
			float ySize7LPI = YSize; // +SixLinesPerInch;
			if (_Match16BitPagination) ySize7LPI += SixLinesPerInch;
			string firstStep = "No";

			if (MyItemInfo.IsHigh && MyItemInfo.MyPrevious == null)
				firstStep = "Yes";
			//if (!ManualPageBreak && mySize + yEndMsg <= yWithinMargins)			// Don't Paginate if there is enough room, will fit on page
			// Pagination Fix - Break1LineShort1
			float yExtra = (yWithinMargins == yPageSize ? 0 : SixLinesPerInch - MyItemInfo.MyDocStyle.Layout.FooterLength) ?? 0;
			float yExtra2 = (SixLinesPerInch - MyItemInfo.MyDocStyle.Layout.FooterLength) ?? 0;
			if (KeepStepsOnPage && ySizeIncludingFirst > yWithinMargins)
				KeepStepsOnPage = false;
			if (!ManualPageBreak && mySize + yEndMsg <= yWithinMargins + yExtra)			// Don't Paginate if there is enough room, will fit on page
			//if (!ManualPageBreak && mySize + yEndMsg <= yWithinMargins + SixLinesPerInch)			// Don't Paginate if there is enough room, will fit on page
			{
				//Console.WriteLine("'PageBreak',1,'No','HLS will fit on page',{0},{1},{2}, {3}, {4},'{5}'", MyItemInfo.ItemID, YSize, yPageSize, yWithinMargins, (int)(100 * yWithinMargins / yPageSize), MyItemInfo.ShortPath);
				ShowPageBreak(-1, "HLS will fit on page", firstStep, YSize, yPageSize, yWithinMargins,ManualPageBreak);
				return 0;
			}
			// !MyItemInfo.IsHigh - if (MyItemInfo.IsRNOPart && MyParent.XOffset < XOffset) return 0; // Don't paginate on an RNO to the right

			// YSize includes a blank line after the step which we don't want to include in the page break test, thus the
			// YSize - SixLinesPerInch:
			if (!KeepStepsOnPage && YSize - SixLinesPerInch + yEndMsg <= yPageSize)	// if the entire step can fit on one page, do a page break
			{
				// Don't want extra line before step
				//Console.WriteLine("'PageBreak',2,'Yes','HLS will fit on 1 Page',{0},{1},{2}, {3}, {4},'{5}'", MyItemInfo.ItemID, YSize, yPageSize, yWithinMargins, (int)(100 * yWithinMargins / yPageSize), MyItemInfo.ShortPath);
				ShowPageBreak(5, "HLS will fit on 1 Page at 6 LPI", "Yes", YSize, yPageSize, yWithinMargins, ManualPageBreak);
				return 1;
			}
			// TODO - yEndMsg - compressed size?

			// ySize7LPI includes a blank line after the step which we don't want to include in the page break test.
			else if (!KeepStepsOnPage && MyItemInfo.ActiveFormat.MyStepSectionLayoutData.CompressSteps && (ySize7LPI - SixLinesPerInch) < (yPageSize * SixLinesPerInch / _SevenLinesPerInch))
			{
				//Console.WriteLine("'PageBreak',3,'Yes','HLS will fit on 1 Page at 7 LPI',{0},{1},{2}, {3}, {4},'{5}'", MyItemInfo.ItemID, YSize, yPageSize, yWithinMargins, (int)(100 * yWithinMargins / yPageSize), MyItemInfo.ShortPath);
				ShowPageBreak(7, "HLS will fit on 1 Page at 7 LPI", "Yes", YSize, yPageSize, yWithinMargins, ManualPageBreak);
				//Console.WriteLine("'7LPI',{0},{1}", MyItemInfo.DBSequence, YSize);
				return 3; // High Level Step can fit at SevenLinesPerInch
			}
			else // The entire step cannot fit on a blank page.
			{
				// if there is more than half a page left, then start to print on the current page
				float myFirstPieceSize = GetFirstPieceSize();		//Case 0
				if (_Match16BitPagination) myFirstPieceSize += 2 * SixLinesPerInch;
				// TODO:  Put this line back to case 0, i.e. previous line.  This fixes a 16-bit vs 32-bit pagination diff in EO30 Step 20.
				//float myFirstPieceSize = GetFirstPieceSize() + 2 * SixLinesPerInch;		//Case 10 - this is to match 16bit
				if (!ManualPageBreak && ((MyItemInfo.ActiveFormat.MyStepSectionLayoutData.SpecialPageBreakFlag && yWithinMargins > yPageSize / 2 &&
					myFirstPieceSize < yWithinMargins) || KeepStepsOnPage))
				{
					//Console.WriteLine("'PageBreak',4,'No','HLS will have to split anyway',{0},{1},{2}, {3}, {4},'{5}'", MyItemInfo.ItemID, YSize, yPageSize, yWithinMargins, (int)(100 * yWithinMargins / yPageSize), MyItemInfo.ShortPath);
					if(firstStep == "Yes")
						ShowPageBreak(8, "First HLS has to split on current page", firstStep, YSize, yPageSize, yWithinMargins, ManualPageBreak);
					else
						ShowPageBreak(6, "HLS will have to split on current page", "Special", YSize, yPageSize, yWithinMargins, ManualPageBreak);
					//BuildPageBreakList(yWithinMargins+SixLinesPerInch,yPageSize-2*SixLinesPerInch);	// Determine items where page break(s) occur
					//BuildPageBreakList(yWithinMargins + SixLinesPerInch, yPageSize);	// Case 5 - Determine items where page break(s) occur
					// Pagination Fix Break1LineShort3a
					BuildPageBreakList(yWithinMargins + SixLinesPerInch, yPageSize + yExtra2,KeepStepsOnPage);	// Case 5 - Determine items where page break(s) occur
					return 0;	// Stay on this page
				}

				// Less than half a page left, start printing on a new page.
				//Console.WriteLine("'PageBreak',5,'Yes','HLS will have to split',{0},{1},{2}, {3}, {4},'{5}'", MyItemInfo.ItemID, YSize, yPageSize, yWithinMargins, (int)(100 * yWithinMargins / yPageSize), MyItemInfo.ShortPath);
				if (firstStep == "Yes")
					ShowPageBreak(9, "First HLS will have to split on new page", "Yes", YSize, yPageSize, yWithinMargins, ManualPageBreak);
				else
					ShowPageBreak(3, "HLS will have to split on new page", "Yes", YSize, yPageSize, yWithinMargins, ManualPageBreak);
				// Determine items where page break(s) occur
				//BuildPageBreakList(yPageSize, yPageSize - 2 * SixLinesPerInch);		// Case Base
				//BuildPageBreakList(yPageSize, yPageSize);			// Case 1 :Works for ES05 Step 15 SubStep 7
				// Pagination Fix Break1LineShort2	
				//BuildPageBreakList(yPageSize + yExtra, yPageSize);			// Case 1 :Works for ES05 Step 15 SubStep 7
				// Pagination Fix Break1LineShort4	
				BuildPageBreakList(yPageSize + yExtra, yPageSize + yExtra2,KeepStepsOnPage);			// Case 1 :Works for ES05 Step 15 SubStep 7
				return 1;		// Paginate on High Level Steps
			}
			//if (yWithinMargins > yPageSize / 2)
			//{
			//    Console.WriteLine("'PageBreak',4,'No','Not Half way down the page',{0},{1},{2}, {3}, {4},'{5}'", MyItemInfo.ItemID, YSize, yPageSize, yWithinMargins, (int)(100 * yWithinMargins / yPageSize), MyItemInfo.ShortPath);
			//    return 0; // More than half way down the page 
			//}
			//if (ChildrenBelow.Count > 0 &&  ChildrenBelow[0].YSize < yWithinMargins)
			//  return 0;
			//Console.WriteLine("'PageBreak',5,'Yes','At least half the page is filled',{0},{1},{2},{3}, {4},'{5}'", MyItemInfo.ItemID, YSize, yPageSize, yWithinMargins, (int)(100 * yWithinMargins / yPageSize), MyItemInfo.ShortPath);
			//return 2;
			throw new Exception("PageBreak Logic Missing, vlnParagraph.cs");
		}
		private void ForcePagination(PdfContentByte cb, ref float yPageStart, float yTopMargin, float yBottomMargin, ref float yLocation, ref float retval)
		{
			cb.PdfDocument.NewPage();		// pagination issue
			DebugText.WriteLine("*****PaginateError");
			yPageStart = yTopMargin + YVeryTop;
			yLocation = yPageStart - YOffset;
			//MyItemInfo.ItemID, YSize, yPageSize, yLocation
			DebugPagination.WriteLine("-1,'Yes','Forced Pagination',{0},{1},,{3},{4}", MyItemInfo.ItemID, YSize, 0, yLocation, MyItemInfo.DBSequence);
			retval = Rtf2Pdf.TextAt(cb, IParagraph, XOffset, yLocation, Width, 100, DebugInfo, yBottomMargin);
		}
		private void ShowPageBreak(int instance, string message, string breakOrNot, float YSize, float yPageSize, float yWithinMargins, bool manualPageBreak)
		{
			if (breakOrNot != "No")
			{
				// DebugPagination.WriteLine("{0}", MyItemInfo.DBSequence); //,instance);
				DebugPagination.WriteLine("{0},'{1}',{2},'{3}','{4}',{5},{6},{7},{8},{9}", 
					MyPageHelper.MyPdfContentByte.PdfWriter.CurrentPageNumber - (breakOrNot == "Yes" ? 0 : 1), 
					MyItemInfo.ShortPath, instance,
					(manualPageBreak ? "Manual " : "") + message, breakOrNot,
					MyItemInfo.ItemID, YSize, yPageSize, yWithinMargins, (int)(100 * yWithinMargins / yPageSize));
			}
			// Console.WriteLine("{0},{1}", MyItemInfo.DBSequence, IsFirstSubStep(MyItemInfo)); //,instance);
		}
		private void BuildPageBreakList(float ySpaceOnCurPage, float yPageSize, bool KeepStepsOnPage)
		{
			ParagraphLocations myLocations = new ParagraphLocations();
			BuildLocationList(YTopMost, myLocations);
			StepLevelList myList = myLocations.BuildStepLevelList(KeepStepsOnPage);
			// Find Break Locations in the list based upon StepLevel and yLocation
			float yTop = 0;
			float yLowerLimit = (yPageSize - 2 * SixLinesPerInch) / 2;
			float yStart = Math.Max(0, (yPageSize - 2 * SixLinesPerInch) - ySpaceOnCurPage);
			//Console.WriteLine("'yStart',{0},{1}", MyItemInfo.DBSequence, yStart);

			// The following three lines make page breaking match 16-bit:
			if (_Match16BitPagination)
			{
				yLowerLimit = yStart - SixLinesPerInch + ySpaceOnCurPage / 2;
				if ((yStart + MyItemInfo.MyDocStyle.Layout.TopMargin + 2 * SixLinesPerInch) > ((MyItemInfo.MyDocStyle.Layout.TopMargin + yPageSize - 2 * SixLinesPerInch) / 2))
					yLowerLimit = yStart + 2 * SixLinesPerInch;
			}
			// Make sure that the FirstPiece (Caution Note HLS and First Substeps) fit
			float myFirstPieceSize = GetFirstPieceSize();		//Case 0
			if (myFirstPieceSize < ySpaceOnCurPage) yLowerLimit = Math.Max(myFirstPieceSize + yStart, yLowerLimit);
			//while ((YSize - yTop) >= ySpaceOnCurPage)
			// Pagination Fix Break1LineShort3b
			while ((YSize - yTop) > ySpaceOnCurPage)
			{
				vlnParagraph paraBreak = FindPageBreak(yStart, ySpaceOnCurPage, yLowerLimit, myList);
				if (paraBreak == null) break;
				// yTopNew is y Location of this page break.  YTopMost is top of HLS, including any Cautions/Notes/Boxes/etc
				float yTopNew = paraBreak.YVeryTop - YTopMost;
				RemoveProcessedParagraphs(myList, yTopNew - yTop);
				yTop = yTopNew;
				MyPageHelper.ParaBreaks.Add(paraBreak);
				ySpaceOnCurPage = yPageSize - 2 * SixLinesPerInch;  // Allow for continue message and blank line.
				//ySpaceOnCurPage = yPageSize;  // Allow for continue message and blank line.
				//DocStyle docstyle = MyItemInfo.MyDocStyle;
				//string myMsg = docstyle.Continue.Bottom.Message;
				//if ((myMsg ?? "") != "") ySpaceOnCurPage -= 2 * SixLinesPerInch;  // Allow for continue message and blank line.
				yLowerLimit = ySpaceOnCurPage / 2;
				if (_Match16BitPagination) yLowerLimit -= 1.5F * SixLinesPerInch; // 276 for HLP
				yStart = 0;
			}
		}
		/// <summary>
		/// Finds the highest StepLevel (lowest StepLevel number, 0 = HLS, 1 = first substep) that
		/// fills the page sufficiently (more than half-full)
		/// </summary>
		/// <param name="yWithinMargins"></param>
		/// <param name="yTop"></param>
		/// <param name="myList"></param>
		/// <returns></returns>
		private static vlnParagraph FindPageBreak(float yStart, float yUpperLimit, float yLowerLimit, StepLevelList myList)
		{
			foreach (int stepLevel in myList.Keys)				// loop thru StepLevels, starting with lowest.
			{
				foreach (float yLocation in myList[stepLevel].Keys)		// loop thru yLocation
				{
					// The top of this step will fit onto page (-yLocation < yWithinMargins)
					if (-yLocation <= yUpperLimit) // Fix for OFN-RJ-23
					//if (-yLocation < yUpperLimit) // Before
					//if (-yLocation < yWithinMargins && myList[stepLevel][yLocation].MyItemInfo.MyPrevious != null)
					{
						//ItemInfo prev = myList[stepLevel][yLocation].MyItemInfo.MyPrevious;
						//if (myList[stepLevel][yLocation].MyItemInfo.ItemID == 5609) Console.WriteLine("aer");
						//if (myList[stepLevel][yLocation].MyItemInfo.ItemID == 4312) Console.WriteLine("rno");
						// The top of this step is more than 1/2 way down the page
						if ((-yLocation + yStart) >= yLowerLimit)
						{
							return myList[stepLevel][yLocation];
						}
						// if is a caution or note & parent is a substep and entire substep doesn't fit, break.
						if ((myList[stepLevel][yLocation].MyItemInfo.IsNote || myList[stepLevel][yLocation].MyItemInfo.IsCaution) &&
							!myList[stepLevel][yLocation].MyParent.MyItemInfo.IsHigh &&
							myList[stepLevel][yLocation].MyParent.YSize > (yUpperLimit + yLocation))
						{
							return myList[stepLevel][yLocation];
						}
					}
				}
			}
			return null;
		}

		//private void WalkStepLevel(float yTopMost)
		//{
		//  foreach (vlnParagraph child in ChildrenAbove)
		//    child.WalkStepLevel(yTopMost);
		//  foreach (vlnParagraph child in ChildrenLeft)
		//    child.WalkStepLevel(yTopMost);
		//  ShowStepLevel(yTopMost);
		//  foreach (vlnParagraph child in ChildrenRight)
		//    child.WalkStepLevel(yTopMost);
		//  foreach (vlnParagraph child in ChildrenBelow)
		//    child.WalkStepLevel(yTopMost);
		//}
		//private void ShowStepLevel(float yTopMost)
		//{
		//  ItemInfo item = MyItemInfo;
		//  ItemInfo parent = item.ActiveParent as ItemInfo;
		//  //if (para.MyItemInfo.ItemID == 205)
		//  //  Console.Write("");
		//  DebugPagination.WriteLine("'StepLevel',{0},{1},{2},{3},{4},{5},{6},{7},{8},{9}", YVeryTop - yTopMost, YSize, YBottomMost - yTopMost, item.ItemID, item.DBSequence, item.StepLevel, item.MyContent.Type % 10000,
		//    parent.MyContent.Type % 10000, item.HasCautionOrNote ? 1 : 0, parent.Cautions == null ? 0 : 1);
		//}
	}
	public partial class VlnSvgPageHelper : SvgPageHelper
	{
		private bool _OriginalPageBreak;		// use 16bit page breaks.
		public bool OriginalPageBreak
		{
			get { return _OriginalPageBreak; }
			set { _OriginalPageBreak = value; }
		}
		// This handles Page Breaks within a Step
		private List<vlnParagraph> _ParaBreaks = new List<vlnParagraph>();
		public List<vlnParagraph> ParaBreaks
		{
			get { return _ParaBreaks; }
			set { _ParaBreaks = value; }
		}
	}
}