using iTextSharp.text;
using iTextSharp.text.pdf;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Text;
using WebApplication5.Models;

namespace WebApplication5.Writer
{
    public class WriterPDF
    {
        private static string[] listOfPodpunkty = new string[] { "a", "b", "c", "d", "e", "f", "g", "h" };

        private Font catFont;
        private Font titleFont;
        private Font baseFont;

        Document document;
        PdfContentByte cb;
        PdfWriter writer;
        FileStream fs;
        public void WriteQuestions(List<Question> questions, int questionNumber)
        {
            var localQuestionCount = 0;
            foreach (var question in questions)
            {
                WriteQuestion(question.QuestionText, questionNumber + localQuestionCount);
                WriteAnswers(question.Answers.ToList());
                localQuestionCount++;
            }
        }

        public void CreateFile(string fileName)
        {
            FontFactory.Register(ConfigurationManager.AppSettings["Fonts"]);

            titleFont = FontFactory.GetFont(BaseFont.HELVETICA, BaseFont.CP1250, BaseFont.EMBEDDED, 18, Font.BOLD);
            catFont = FontFactory.GetFont(BaseFont.HELVETICA, BaseFont.CP1250, BaseFont.EMBEDDED, 16, Font.BOLD);
            baseFont = FontFactory.GetFont(BaseFont.HELVETICA, BaseFont.CP1250, BaseFont.EMBEDDED, 12);
            var path = ConfigurationManager.AppSettings["TestsFolder"];

            document = new Document();
            BaseFont helvetica = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1250, BaseFont.EMBEDDED);
            Font helvetica16 = new Font(helvetica, 16);
            // open the writer
            fs = new FileStream(path + fileName + ".pdf", FileMode.Create, FileAccess.Write);
            writer = PdfWriter.GetInstance(document, fs);
            document.Open();
            // the pdf content
            cb = writer.DirectContent;
        }
        private void WriteQuestion(string question, int questionNumber)
        {
            document.Add(new Paragraph(string.Format("{0}. {1}", questionNumber, question),baseFont));
        }
        private string FormatAnswer(int letter, string answer)
        {
            return string.Format("{0}) {1}", listOfPodpunkty[letter], answer);
        }
        private void WriteAnswers(List<Answer> answers)
        {
            PdfPTable table = new PdfPTable(2);

            table.WidthPercentage = 90;
            table.DefaultCell.Border = 0;
            for (int i = 0; i < answers.Count; i++)
            {
                table.AddCell(new Phrase(FormatAnswer(i, answers.ElementAt(i).AnswerText),baseFont));
            }

            if (answers.Count % 2 == 1)
            {
                var cell = new PdfPCell(new Phrase(" "));
                cell.Border = 0;
                table.AddCell(cell);
            }

            document.Add(table);
        }


        public void WriteTitle(string title)
        {
            document.AddTitle(title);
            var phar = new Paragraph();
            phar.Add(new Paragraph(title, titleFont));
            document.Add(phar);
        }
        public void WriteCategory(string cat)
        {
            var phar = new Paragraph();
            AddEmptyLine(phar, 1);
            phar.Add(new Paragraph(cat, catFont));
            AddEmptyLine(phar, 1);
            document.Add(phar);
        }
        public void EndPage()
        {
            document.NewPage();
        }
        private static void AddEmptyLine(Paragraph paragraph, int number)
        {
            for (int i = 0; i < number; i++)
            {
                paragraph.Add(new Paragraph(" "));
            }
        }
        public void CloseFile()
        {
            document.Close();
            fs.Close();
            writer.Close();
        }



        public void WriteAnswerTemplate(List<Question> questions, string qrCode)
        {
            AddUserId();

            WriteTitle("Odpowiedzi");

            PdfPTable outer = new PdfPTable(2);
            outer.WidthPercentage = 95;
            outer.HorizontalAlignment = Element.ALIGN_LEFT;
            var size = questions.Count - (questions.Count / 2);
            var isEven = questions.Count % 2 == 0;
            outer.DefaultCell.Border = 0;
            outer.AddCell(CreateAnswersTable(questions.Take(size).ToList(), 0));
            outer.AddCell(CreateAnswersTable(questions.Skip(size).ToList(), size, isEven));

            document.Add(outer);
            AddQRCode(qrCode);
            EndPage();
        }

        private PdfPTable CreateAnswersTable(List<Question> questions, int moved, bool isEven = false)
        {
            var maxWidth = questions.Max(t => t.Answers.Count) + 1;
            var table = new PdfPTable(maxWidth);
            table.DefaultCell.Border = 0;
            table.HorizontalAlignment = Element.ALIGN_LEFT;

            var cornerCell = new PdfPCell(new Phrase(" "));
            cornerCell.Border = 0;
            table.AddCell(cornerCell);

            var widths = new List<float>();
            var ratio = (5 * maxWidth - 2);
            var percentage = 100 / ratio;
            var rest = 100 % ratio;

            widths.Add(2 * percentage + rest);
            for (int i = 1; i < maxWidth; i++)
            {
                widths.Add(percentage * 5);
            }
            table.SetWidthPercentage(widths.ToArray(), document.PageSize);
            for (int k = 0; k < maxWidth - 1; k++)
            {
                var lettersCell = new PdfPCell(new Phrase(listOfPodpunkty[k]));
                lettersCell.Border = 0;
                lettersCell.HorizontalAlignment = Element.ALIGN_CENTER;
                table.AddCell(lettersCell);
            }

            for (int i = 0; i < questions.Count; i++)
            {
                var ansCount = 1;
                var numberCell = new PdfPCell(new Phrase(string.Format("{0}.", i + 1 + moved)));
                numberCell.Border = 0;
                numberCell.HorizontalAlignment = Element.ALIGN_RIGHT;
                table.AddCell(numberCell);

                foreach (var a in questions.ElementAt(i).Answers)
                {
                    var answerCell = new PdfPCell(new Phrase(" "));
                    answerCell.Border = 15;
                    table.AddCell(answerCell);
                    ansCount++;
                }

                for (int j = ansCount; j < maxWidth; j++)
                {
                    var emptyAnswerCell = new PdfPCell(new Phrase(" "));
                    emptyAnswerCell.Border = 0;
                    table.AddCell(emptyAnswerCell);
                }
            }
            if (!isEven)
            {
                for (int j = 0; j < maxWidth; j++)
                {
                    var emptyAnswerCell = new PdfPCell(new Phrase(" "));
                    emptyAnswerCell.Border = 0;
                    table.AddCell(emptyAnswerCell);
                }
            }
            return table;
        }

        private void AddQRCode(string salt)
        {
            var qrcode = new BarcodeQRCode(salt, 100, 100, null);
            var image = qrcode.GetImage();
            var mask = qrcode.GetImage();
            mask.MakeMask();
            image.ImageMask = mask; // making the background color transparent
            image.SetAbsolutePosition(document.PageSize.Width - document.RightMargin - 80, document.PageSize.Height - document.TopMargin - 80);
            document.Add(image);
        }

        private void AddUserId()
        {
            WriteTitle("PESEL");
            PdfPTable table = new PdfPTable(11);
            table.SpacingBefore = 10;
            table.WidthPercentage = 50;
            table.HorizontalAlignment = Element.ALIGN_LEFT;
            for (int i = 0; i < 11; i++)
                table.AddCell(" ");

            document.Add(table);
        }
    }
}