using System;
using System.IO;

public class oasis
{
    //Convert Biophysical Society Meeting agenda from Oasis format to plain text
    //V.V. 02/28/2011. vvostri@gmail.com

    public static void Main()
    {
        string filename;

        do
        {  
        Console.WriteLine("Enter itinerary file name");
        filename = Console.ReadLine();

        if (File.Exists(filename))
        {

            string[,] data = new string[1, 5];
            int counter = 0;
            int section_element = 0;
            bool section = false;

            StreamReader streamvariable = File.OpenText(filename);
            string lineinfile;
            string[] splitline;

            lineinfile = streamvariable.ReadLine();

            //Number of events
            while (lineinfile != null)
            {
                if (lineinfile.Contains("<tr"))
                {
                    counter++;
                }
                lineinfile = streamvariable.ReadLine();
            }
            streamvariable.Close();

            //Excluding header
            int N_elements = counter - 1;

            data = new string[counter - 1, 5];
            //Time
            //Location
            //Title
            //Authors
            //Poster number

            counter = 0;

            streamvariable = File.OpenText(filename);
            lineinfile = streamvariable.ReadLine();

            while (lineinfile != null)
            {
                //Event delimeters
                if (lineinfile.Contains("<tr") && counter != 0)
                {
                    section = true;
                }
                if (lineinfile.Contains("</tr"))
                {
                    section = false;
                    counter++;
                    section_element = 0;
                }

                if (lineinfile.Contains("<td") && section == true)
                {
                    if (section_element == 0)
                    {
                    }

                    if (section_element == 1)
                    {
                        splitline = lineinfile.Split(new string[] { ">", "<" }, StringSplitOptions.None);
                        if (splitline.Length == 11)
                        {
                            data[counter - 1, 0] = splitline[4];
                            data[counter - 1, 1] = splitline[8].Trim();
                        }
                    }

                    if (section_element == 2)
                    {
                    }

                    if (section_element == 3 && lineinfile.Contains("B"))
                    {
                        splitline = lineinfile.Split(new string[] { "<td> ", "</td>", " " }, StringSplitOptions.RemoveEmptyEntries);
                        data[counter - 1, 4] = splitline[0];
                    }

                    if (section_element == 4)
                    {
                        string[] periodsplit = lineinfile.Split(new string[] { "." }, StringSplitOptions.RemoveEmptyEntries);
                        string affiliation = null;
                        string authors = null;

                        if (periodsplit.Length > 2)
                        {
                            //String, containing everything after the last period mark
                            affiliation = periodsplit[periodsplit.Length - 2] + "." + periodsplit[periodsplit.Length - 1];

                            //String, containing author list and special characters
                            affiliation = lineinfile.Substring(0, lineinfile.Length - affiliation.Length);

                            //Stripping of html tags and separating by author
                            string[] temp = affiliation.Split(new string[] { ",", "<b>", "</b>", "<sup>", "</sup>", "<td>" }, StringSplitOptions.RemoveEmptyEntries);

                            for (int i = 0; i != temp.Length; i++)
                            {
                                temp[i] = temp[i].Trim();
                                string[] spacesplit = temp[i].Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);

                                if (spacesplit.Length > 1)
                                {
                                    if (authors == null)
                                    {
                                        authors = temp[i];
                                    }
                                    else
                                    {
                                        authors = authors + ", " + temp[i];
                                    }
                                }
                            }

                        }
                        data[counter - 1, 2] = authors;
                    }

                    if (section_element == 5)
                    {
                        //Title
                        splitline = lineinfile.Split(new string[] { "<td> ", "<br" }, StringSplitOptions.RemoveEmptyEntries);
                        string temp = splitline[1].ToLower().Trim();

                        //Get the first character of the string, rather than switch to upper case
                        //in case it is a number.
                        string firstletter = splitline[1].Substring(0, 1);

                        string[] remove_italics = temp.Split(new string[] { "<i>", "</i>", "<sup>", "</sup>" }, StringSplitOptions.None);
                        int italics_length = remove_italics.Length;
                        temp = firstletter + remove_italics[0].Remove(0, 1);

                        for (int i = 1; i != italics_length; i++)
                        {
                            temp += remove_italics[i];
                        }

                        data[counter - 1, 3] = temp;
                    }
                    section_element++;
                }
                lineinfile = streamvariable.ReadLine();
            }
            streamvariable.Close();

            //Write the plain text file
            FileStream file = new FileStream("BPS_agenda.txt", FileMode.Create, FileAccess.Write);
            StreamWriter sw = new StreamWriter(file);
            {
                for (counter = 0; counter < N_elements; counter++)
                {
                    sw.Write(data[counter, 0]);
                    sw.Write(", ");
                    sw.Write(data[counter, 1]);
                    if (data[counter, 4] != null)
                    {
                        sw.Write(", ");
                        sw.Write(data[counter, 4]);
                    }
                    sw.Write("\r\n");
                    sw.Write(data[counter, 3]);
                    sw.Write("\r\n");
                    sw.Write(data[counter, 2]);
                    sw.Write("\r\n\r\n");
                }
            }
            sw.Close();
            file.Close();
        }

        else
        {
            Console.WriteLine("File {0} not found\n", filename);
        }

        } while (filename != "quit");
    }
}