using System;
using System.Collections;
using System.Collections.Generic;
using iTextSharp.text;
using iTextSharp.text.pdf;
using Spring.Objects;
using Sleis.Utility;

namespace Sleis.Pdf
{
    public class ObjectTableWriter : ElementWriter
    {

        
        //public string Select { get; set; }
        public List<IElementWriter> Columns { get; set; }
        public int? BorderWidth { get; set; }

        public override void Init()
        {
            ArgumentValidationUtility.ThrowOnEmpty(Select, "Select");
            ArgumentValidationUtility.ThrowOnEmpty(Columns, "Columns");

            if (!BorderWidth.HasValue)
            {
                BorderWidth = 1;
            }
        }


        public override void Write(Document pdf, ObjectWrapper context)
        {
            LOG.Debug("Init Write");
            BeforeWrite(pdf, context);

            
            //Table
            object selectionValue = null;
            try { selectionValue = context.GetPropertyValue(Select); }
            catch (Exception err) { LOG.Debug(String.Format("Error getting accessing {0} : {1}", Select, err.Message)); return; }//swallowed
            IEnumerable list = selectionValue as IEnumerable;

            //Write the table only if there is a content
            if (list != null)
            {
                //Write label
                Paragraph labelP = new Paragraph(Label, LabelFont);

                if (SpaceBefore.HasValue)
                {
                    labelP.SpacingBefore = SpaceBefore.Value;
                }

                if (SpaceAfter.HasValue)
                {
                    labelP.SpacingAfter = SpaceAfter.Value;
                }
                pdf.Add(labelP);

                PdfPTable table = new PdfPTable(Columns.Count);
                //workaround for WidthPercentage issues
                table.TotalWidth = pdf.PageSize.Width - pdf.LeftMargin - pdf.RightMargin;
                table.HorizontalAlignment = Element.ALIGN_LEFT;

                IEnumerator enumerator = list.GetEnumerator();
                //draw headers
                foreach(IElementWriter writer in Columns)
                {
                    PdfPCell headerCell = new PdfPCell();
                    headerCell.AddElement(new Phrase(writer.Label, LabelFont));
                    headerCell.HorizontalAlignment = PdfPCell.ALIGN_LEFT;
                    headerCell.VerticalAlignment = PdfPCell.ALIGN_TOP;
                    headerCell.BorderColor = new BaseColor(System.Drawing.Color.LightGray);
                    headerCell.BorderWidth = BorderWidth.Value;
                    table.AddCell(headerCell);
                }
                
                while (enumerator.MoveNext())
                {
                    object candidateObject = enumerator.Current;
                    LOG.DebugFormat("Validating: {0}", candidateObject);
                    ObjectWrapper row = new ObjectWrapper(candidateObject);

                    foreach (IElementWriter writer in Columns)
                    {
                        //PdfPCell cell = new PdfPCell(new Phrase(element.Make(row), Font));
                        PdfPCell cell = new PdfPCell();                        
                        cell.AddElement(writer.GetElement(new PdfPCell(), row));
                        cell.HorizontalAlignment = PdfPCell.ALIGN_LEFT;
                        cell.VerticalAlignment = PdfPCell.ALIGN_TOP;
                        cell.BorderColor = new BaseColor(System.Drawing.Color.LightGray);
                        cell.BorderWidth = BorderWidth.Value;
                        table.AddCell(cell);
                    }

                } //each row item

                pdf.Add(table);

                
            }            
        }
        public override IElement GetElement(IElement element, ObjectWrapper context)
        {
            LOG.Debug("Building sub table");            

            //Write label
            Paragraph para = new Paragraph(Label, LabelFont);            
            if (SpaceBefore.HasValue)
            {
                para.SpacingBefore = SpaceBefore.Value;
            }

            if (SpaceAfter.HasValue)
            {
                para.SpacingAfter = SpaceAfter.Value;
            }
            
            //Table
            object selectionValue = null;
            try { selectionValue = context.GetPropertyValue(Select); }
            catch(Exception err) { LOG.Debug(String.Format("Error getting accessing {0} : {1}", Select,  err.Message)); }//swallowed
            IEnumerable list = selectionValue as IEnumerable;
            //Write the table only if there is a content
            if (list != null)
            {

                PdfPTable table = new PdfPTable(Columns.Count);
                table.KeepTogether = true;
                //workaround for WidthPercentage issues
                table.WidthPercentage = 95;                
                table.HorizontalAlignment = Element.ALIGN_LEFT;

                IEnumerator enumerator = list.GetEnumerator();
                while (enumerator.MoveNext())
                {
                    object candidateObject = enumerator.Current;
                    LOG.DebugFormat("Validating: {0}", candidateObject);
                    ObjectWrapper row = new ObjectWrapper(candidateObject);

                    foreach (IElementWriter writer in Columns)
                    {
                        //PdfPCell cell = new PdfPCell(new Phrase(element.Make(row), Font));
                        PdfPCell cell = new PdfPCell();                       
                        cell.AddElement(writer.GetElement(new PdfPCell(), row));
                        cell.HorizontalAlignment = PdfPCell.ALIGN_LEFT;
                        cell.VerticalAlignment = PdfPCell.ALIGN_TOP;
                        cell.BorderColor = new BaseColor(System.Drawing.Color.LightGray);
                        cell.BorderWidth = BorderWidth.Value;
                        table.AddCell(cell);
                    }

                } //each row item
                para.Add(table);
                //return para; going to return table.  maybe issue adding table to para then to table cell?
                return table;
            }
            return null;  
        }
    }
}