using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using ClearSlideLibrary.Dom;
using System.Drawing;
using System.Windows.Forms;
using ClearSlideLibrary.Dom.PPTTexts;


namespace ClearSlideLibrary.HtmlController
{
    internal class HtmlShape : HtmlPresentationElement
    {
        public PPTShape Shape { get; set; }
        public double Rotate { get; set; }
        public string HyperLink { get; set; }        
        private int slideIndex;

        public HtmlShape(string id, int width, int height,
                         int top, int left, bool invisible,
                         bool animatable, int slideIndex)
        {
            base.id = id;
            base.top = top;
            base.left = left;
            base.width = width;
            base.height = height;
            base.invisible = invisible;
            base.animatable = animatable;
            this.slideIndex = slideIndex;
        }

        public override string DrawElement()
        {
            StringBuilder shapeBuilder = new StringBuilder();
            //we need this for text (if any in the shape).
            /*string slideId = id.Substring(0, 2);
            int slideNumber = Int32.Parse(slideId.Substring(1, 1));
            string shapeId = id.Substring(2, 2);
            int shapeNumber = Int32.Parse(shapeId.Substring(1, 1));*/

            string style = invisible ? "DC0" : "DC1";

            //the object has animation.
            if (animatable)
            {

                shapeBuilder.Append("<div id=\"" + id + "\" style=\"top:" + top.ToString() + "px;left:" + left.ToString() +
                               "px;height:" + height.ToString() + "px;width:" + width.ToString() + "px;\">");
                shapeBuilder.Append("<div class=\"" + style + "\" id=\"" + id + "c" + "\">");
                shapeBuilder.Append("<img />");
                shapeBuilder.Append("</div>");
                shapeBuilder.Append("</div>");
                if (Shape.IsText)
                {
                    if (Shape.Texts != null)
                    {
                        DrawText(shapeBuilder);
                    }
                }
            }
            else
            {
                shapeBuilder.Append("<div id=\"" + id + "\" style=\"top:" + top.ToString() + "px;left:" + left.ToString() +
                                 "px;height:" + height.ToString() + "px;width:" + width.ToString() + "px;\">");
                shapeBuilder.Append("<img/>");
                shapeBuilder.Append("</div>");
                if (Shape.IsText)
                {
                    if (Shape.Texts != null)
                    {
                        DrawText(shapeBuilder);
                    }
                }


            }
            return shapeBuilder.ToString();
        }

        private void DrawText(StringBuilder shapeBuilder)
        {
            int top = getTopForCurrentAnchoring(this.Shape.VerticalAlign, this.Shape.Texts);


            foreach (var par in Shape.Texts)
            {

                //If top add spacing before - otherwise not (I think)
                int paragraphTop = this.top + (this.Shape.VerticalAlign.Equals(DocumentFormat.OpenXml.Drawing.TextAnchoringTypeValues.Top) ? par.getSpaceBeforePoints() : 0); 

                string htmlStyle = par.Invisible ? "DC0" : "DC1";
                if (par.Animatable)
                {
                    shapeBuilder.Append("<div id=\"" + id + "p" + par.Paragraph + "\" style=\"top:" + paragraphTop + "px;left:" + this.left.ToString() +
                                   "px;height:" + height.ToString() + "px;width:" + width.ToString() + "px;\">");
                    shapeBuilder.Append("<div class=\"" + htmlStyle + "\" id=\"" + id + "p" + par.Paragraph + "c" + "\">");
                }
                else
                {
                    shapeBuilder.Append("<div id=\"" + id + "p" + par.Paragraph + "\" style=\"top:" + (this.top).ToString() + "px;left:" + this.left.ToString() +
                                     "px;height:" + height.ToString() + "px;width:" + width.ToString() + "px;\">");
                }

                int newTop = par.getSpaceBeforePoints();
                int left = 0;

                List<HtmlText> textElements = new List<HtmlText>();
                if (par.RunPropList == null || par.RunPropList.Count == 0 && par.defaultRunProperties != null)  //Only paragraph!
                {
                    float points = float.Parse(par.defaultRunProperties.FontSize.ToString()) * 72.0F / 96.0F;
                    Font font = new System.Drawing.Font(par.defaultRunProperties.FontFamily.ToString(), points);
                    newTop = font.Height;
                }
                List<HtmlText> processedElements = new List<HtmlText>();
                foreach (var text in breakTextsToShape(par))
                {
                    float points = float.Parse(text.FontSize.ToString()) * 72.0F / 96.0F;
                    Font font = new System.Drawing.Font(text.FontFamily.ToString(), points);
                    if (text.Bold) font = new System.Drawing.Font(text.FontFamily.ToString(), points, FontStyle.Bold);
                    else if (text.Italic)
                        font = new System.Drawing.Font(text.FontFamily.ToString(), points, FontStyle.Italic);
                    else if (text.Underline != null && text.Underline.Equals("Single"))
                    font = new System.Drawing.Font(text.FontFamily.ToString(), points, FontStyle.Underline);
                    newTop = font.Height > newTop ? font.Height : newTop;                    
                    newTop = par.getLineSpacingInPointsFromFont(newTop);


                    if (text.isBreak)
                    {
                        top += newTop;
                        left = 0;
                        fixLeftSpacingForAlignment(processedElements, par,font);
                        processedElements.Clear();
                        continue;
                    }
                    String currentString =  text.Text.TrimEnd()+ getStringFromTextElements(processedElements);
                    //Text must already be broken to lines
                    //Size size = MeasureString(currentString, font);
//                     if (size.Width > this.width - par.Indent - par.marginLeft - par.marginRight) 
//                     {
//                         top += newTop;
//                         left = 0;
//                         fixLeftSpacingForAlignment(processedElements, par, font);
//                         processedElements.Clear();
//                     }


                    HtmlText t1 = new HtmlText(left: left,
                                               top: top,
                                               fontFamily: text.FontFamily,
                                               fontColor: text.FontColor,
                                               fontSize: text.FontSize,
                                               isBullet: text.isBullet,
                                               bold: text.Bold,
                                               italic: text.Italic,
                                               underline: text.Underline,                                               
                                               id: id,
                                               slideIndex: slideIndex)
                    {
                        Rotate = Rotate                      
                    };

                    t1.width = MeasureString(text.Text, font);

                    if (text.isBullet && text.Text != null && text.Text.Contains("rId"))
                    {
                        t1.PictureBullet = true;
                        t1.width = text.bulletSize;
                        t1.bulletSize = text.bulletSize;
                        newTop = text.bulletSize;
                    }
                    t1.Text = text.Text;
                    textElements.Add(t1);
                    processedElements.Add(t1);
                }
                fixLeftSpacingForAlignment(processedElements, par);

                HtmlText lastTxt = null;
                List<HtmlText> mergedTextElements = new List<HtmlText>();
                foreach (HtmlText textElement in textElements)
                {
                    if (lastTxt == null || !lastTxt.sameProps(textElement))
                        mergedTextElements.Add(textElement);
                    else
                        mergedTextElements[mergedTextElements.Count - 1].Text += textElement.Text;

                    lastTxt = textElement;
                }

                foreach (HtmlText textElement in mergedTextElements)
                    shapeBuilder.Append(textElement.DrawElement());
                top += newTop;
                top += par.getSpaceAfterPoints(newTop);
                top += par.getSpaceBeforePoints(newTop);


                shapeBuilder.Append("</div>");
                if (par.Animatable)
                    shapeBuilder.Append("</div>");
            }
        }
        private String getStringFromTextElements(List<HtmlText> elements)
        {
            if (elements == null || elements.Count == 0)
                return "";
            StringBuilder result=new StringBuilder();
            foreach(HtmlText el in elements){
                result.Append(el.Text);          
            }            
            return result.ToString();
        }
        //We have two similar methods. This is worse because it uses the Width property of each element instead of measuring the whole string. 
        //There is mistake in the calculations coming from that and the difference is bigger when there are more elements. 
        private void fixLeftSpacingForAlignment(List<HtmlText> textElements, PPTParagraph par)
        {
            int combinedWidth = 0;

            foreach (HtmlText textElement in textElements)
                combinedWidth += textElement.width;
            int bulletOffset = 0;
            if (par.bullet != null && textElements.Count > 0 && !textElements[0].isBullet)
            {
                combinedWidth += par.bullet.bulletSize;
                bulletOffset = par.bullet.bulletSize;
            }
            
            int currentLeft = 0;
            if ("Center".Equals(par.Align))
                currentLeft = ((this.width - par.Indent - bulletOffset - par.marginLeft - par.marginRight - Shape.LeftInset - Shape.RightInset) - combinedWidth) / 2;
            else if ("Right".Equals(par.Align))
                currentLeft = (this.width - par.Indent - bulletOffset - par.marginLeft - par.marginRight - Shape.LeftInset - Shape.RightInset) - combinedWidth;

            foreach (HtmlText textElement in textElements)
            {
                textElement.setLeft(currentLeft + par.Indent + bulletOffset + par.marginLeft + Shape.LeftInset);
                currentLeft += textElement.width;
            }
        }

        //We have two similar methods - this one is better because it measures the whole string with the font. 
        private void fixLeftSpacingForAlignment(List<HtmlText> textElements, PPTParagraph par, Font font)
        {
            int combinedWidth = 0;
          
            StringBuilder combinedText = new StringBuilder();
            foreach (HtmlText textElement in textElements)
            {
                if(textElement.PictureBullet)
                    combinedWidth += textElement.bulletSize;
                else
                combinedText.Append(textElement.Text);
            }
            int bulletOffset = 0;
            if (par.bullet != null && textElements.Count > 0 && !textElements[0].isBullet)
            {
                bulletOffset = par.bullet.bulletSize;
                combinedWidth += par.bullet.bulletSize;
            }
            combinedWidth += MeasureString(combinedText.ToString(), font);
         
            int firstLeft = 0;
            if ("Center".Equals(par.Align))
                firstLeft = ((this.width - par.Indent - bulletOffset - par.marginLeft - par.marginRight - Shape.LeftInset - Shape.RightInset) - combinedWidth) / 2;
            else if ("Right".Equals(par.Align))
                firstLeft = (this.width - par.Indent - bulletOffset - par.marginLeft - par.marginRight - Shape.LeftInset - Shape.RightInset) - combinedWidth;
            combinedText = new StringBuilder();
            combinedWidth = 0; //Now used only for picture bullets!
            foreach (HtmlText textElement in textElements)
            {
                textElement.setLeft(firstLeft + par.Indent + bulletOffset + par.marginLeft + combinedWidth + Shape.LeftInset + MeasureString(combinedText.ToString(), font));
                if (textElement.PictureBullet)
                    combinedWidth += textElement.bulletSize;
                else
                    combinedText.Append(textElement.Text);
            }
        }

        private int getTopForCurrentAnchoring(DocumentFormat.OpenXml.Drawing.TextAnchoringTypeValues anchoring, LinkedList<PPTParagraph> paragraphList)
        {
            if (anchoring.Equals(DocumentFormat.OpenXml.Drawing.TextAnchoringTypeValues.Top))
                return Shape.TopInset;

            int combinedHeight = 0;
            foreach (PPTParagraph par in paragraphList)
            {
                int newTop = 0;
                IEnumerable<PPTRunProperties> splitText=breakTextsToShape(par);
                foreach (var text in splitText)
                {
                    float points = float.Parse(text.FontSize.ToString()) * 72.0F / 96.0F;
                    Font font = new System.Drawing.Font(text.FontFamily.ToString(), points);
                    if (text.Bold) font = new System.Drawing.Font(text.FontFamily.ToString(), points, FontStyle.Bold);
                    else if (text.Italic) font = new System.Drawing.Font(text.FontFamily.ToString(), points, FontStyle.Italic);
                    else if (text.Underline != null && text.Underline.Equals("Single"))
                        font = new System.Drawing.Font(text.FontFamily.ToString(), points, FontStyle.Underline);                    
                    if (text.isBreak)
                    {
                        combinedHeight += newTop;
                        newTop = font.Height;
                        continue;
                    }
                    
                    newTop = font.Height > newTop ? font.Height : newTop;

                }
                combinedHeight += par.getLineSpacingInPointsFromFont(newTop);
                combinedHeight += par.getSpaceBeforePoints(newTop);
                combinedHeight += par.getSpaceAfterPoints(newTop);                
            }

            combinedHeight += Shape.TopInset + Shape.BottomInset;
            if (anchoring.Equals(DocumentFormat.OpenXml.Drawing.TextAnchoringTypeValues.Bottom))
                return this.height - combinedHeight;

            return (this.height - combinedHeight) / 2;  //Center align



        }

        private IEnumerable<PPTRunProperties> breakTextsToShape(PPTParagraph par)
        {
            List<Dom.PPTTexts.PPTRunProperties> list = par.RunPropList;
            List<PPTRunProperties> result = new List<PPTRunProperties>();            
            String previousToken = null;
            int bulletSize = 0;
            foreach (var text in list)
            {
                float points = float.Parse(text.FontSize.ToString()) * 72.0F / 96.0F;
                Font font = new System.Drawing.Font(text.FontFamily.ToString(), points);
                if (text.Bold) font = new System.Drawing.Font(text.FontFamily.ToString(), points, FontStyle.Bold);
                else if (text.Italic) font = new System.Drawing.Font(text.FontFamily.ToString(), points, FontStyle.Italic);
                else if (text.Underline != null && text.Underline.Equals("Single"))
                    font = new System.Drawing.Font(text.FontFamily.ToString(), points, FontStyle.Underline);

                int size = 0;
                if (text.isBullet && text.Text != null && text.Text.Contains("rId"))
                    bulletSize = text.bulletSize;
                else
                    size = MeasureString((previousToken == null ? "" : previousToken + " ") + text.Text, font);
                if (text.isBreak || size + bulletSize < this.width - par.Indent -par.marginLeft - par.marginRight - Shape.LeftInset - Shape.RightInset)
                {
                    if (text.Text != null && text.Text.Trim() != "" && !(text.isBullet && text.Text.Contains("rId")))
                    {
                        previousToken = (previousToken == null ? "" : previousToken ) + text.Text;
                    }
                    if (text.isBreak)
                        previousToken = null;
                    result.Add(text);                    
                    continue;
                }

             //   previousToken = null;

                string[] tokens= text.Text.Split(' ');
                int index = 0;
                foreach (string token in tokens)
                {
                    index++;           
                    int combinedSize = MeasureString((previousToken == null ? "" : previousToken + " ")+token , font);

                    if (combinedSize + bulletSize > this.width - par.Indent - par.marginLeft - par.marginRight - Shape.LeftInset - Shape.RightInset)
                    {
                        PPTRunProperties temp = new PPTRunProperties(text);                        
                        temp.Text = "";
                        temp.isBreak = true;
                        result.Add(temp);

                        temp=new PPTRunProperties(text);
                        temp.Text=index<tokens.Length? token+" ":token;
                        result.Add(temp);
                        previousToken = token;                        
                    }
                    else
                    {
                        PPTRunProperties temp = new PPTRunProperties(text);
                        temp.Text = index < tokens.Length ? token + " " : token;
                        result.Add(temp);
                        previousToken = (previousToken == null ? "" : previousToken + " ") + token;
                    }                    
                }
            }
            return result;
        }

        public static int MeasureString(string s, Font font)
        {
            s = s.Replace("\t", "aaaa");//TODO the replace is dirty hack for measuring tabulations

            StringFormat stringFormat = new StringFormat(StringFormat.GenericTypographic);            
            CharacterRange[] rng = { new CharacterRange(0, s.Length) };
            stringFormat.SetMeasurableCharacterRanges(rng);
            Graphics g= Graphics.FromImage(new Bitmap(100, 100));
            //Use measure character ranges with a big box because we used this for measurement only
            //Later we might better use this for drawing the text. 
            Region[] regions =g.MeasureCharacterRanges(s, font, new Rectangle(0, 0, 10000,3000), stringFormat); 
            foreach (Region region in regions)
            {                
                RectangleF rect = region.GetBounds(g);
                return (int)Math.Round(rect.Width);
            }
            return 0;

// 
//             SizeF result;
//             using (var image = new Bitmap(1, 1))
//             {
//                 using (var g = Graphics.FromImage(image))
//                 {
//                     result = g.MeasureString(s, font);
//                 }
//             }
// 
//             return result.ToSize();
        }

        public override string ToString()
        {
            Console.WriteLine("The top is:" + top);
            Console.WriteLine("The left is:" + left);
            Console.WriteLine("The width is:" + width);
            Console.WriteLine("The height is:" + height);
            return string.Format("[{0}, {1}, {2}, {3}]", top, left, width, height);
        }
    }
}