/*========================================================================
        Copyright (C) 2006 by Geir-Tore Lindsve, Torbjørn Meistad 
        and Yngve Raudberget, hereby refered to as "the authors".
                        All rights reserved

    Permission is hereby granted, without written agreement and without
    license or royalty fees, to use, reproduce, prepare derivative
    works, distribute, and display this software and its documentation
    for NONCOMMERCIAL RESEARCH AND EDUCATIONAL PURPOSES, provided 
    that (1) the above copyright notice and the following two paragraphs 
    appear in all copies of the source code and (2) redistributions, 
    including without limitation binaries, reproduce these notices in 
    the supporting documentation. 

    IN NO EVENT SHALL THE AUTHORS, OR DISTRIBUTORS OF THIS SOFTWARE 
    BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, 
    OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE 
    AND ITS DOCUMENTATION, EVEN IF THE AUTHORS OR ANY OF THE ABOVE 
    PARTIES HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    THE AUTHORS SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING,
    BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
    FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
    ON AN "AS IS" BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE NO
    OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
    MODIFICATIONS.
========================================================================*/

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Xml;
using System.Xml.Schema;
using CLab;
using CLab.Exceptions;
using CLab.Data;
using System.Reflection;
using com.calitha.goldparser;

namespace CLab.Parsers
{
    /// <summary>
    /// TextParser for converting from plain text CP to XML, or XML to CP
    /// Parsing from XML utilizes the <see cref="T:ClabXmlParser"/> class.
    /// </summary>
    public class CLabTextParser
    {
        /// <summary>
        /// Parses XML input to plain text CP
        /// </summary>
        /// <param name="filename">Filename of XML input file</param>
        /// <returns>CP string representation of XML input file</returns>
        public String XMLtoCP(string filename)
        {
            String output = "";
            CP cp = new CP(filename);

            //Print out contents of the CP object
            //Prints header
            if (!cp.Description.Equals("") | !cp.Author.Equals("") | !cp.Date.Equals(""))
            {
                if (!cp.Description.Equals(""))
                {
                    output += "// Description:  " + cp.Description + "\n";
                }
                if (!cp.Author.Equals(""))
                {
                    output += "// Author:  " + cp.Author + "\n";
                }
                if (!cp.Date.Equals(""))
                {
                    output += "// Date:  " + cp.Date + "\n";
                }
            }

            //Print types
            output += "\ntype\n";
            for (int i = 0; i < cp.Types.Count; i++)
            {
                output += "  " + cp.Types[i] + "\n";
            }
            //Print variables
            output += "\nvariable\n";
            for (int i = 0; i < cp.Variables.Count; i++)
            {
                output += "  " + cp.Variables[i] + "\n";
            }
            //Print rules
            output += "\nrule\n";
            for (int i = 0; i < cp.Rules.Count; i++)
            {
                output += "  " + cp.Rules[i] + ";\n";
            }
            cp = null;
            return output.Trim();
        }

        /// <summary>
        /// Parses plain text CP to XML format
        /// </summary>
        /// <param name="input">String with CP input to parse</param>
        /// <returns>Memorystream with XML data</returns>
        /// <exception cref="TokenParserException"/>
        /// <exception cref="Exception"/>
        public MemoryStream CPtoXML(String input)
        {
            MemoryStream stream = new MemoryStream();

            int commentType = 0;
            String description = "";
            String author = "";
            String date = "";

            XmlWriterSettings settings = new XmlWriterSettings();
            settings.Indent = true;
            settings.IndentChars = "    ";
            settings.NewLineOnAttributes = true;
            settings.CloseOutput = false;
            settings.Encoding = Encoding.UTF8;

            XmlWriter xWriter = XmlWriter.Create(stream, settings);

            Assembly ase = Assembly.GetExecutingAssembly();
            Stream ClabGrammar = ase.GetManifestResourceStream("CLab.Auxiliary.ClabGrammar.cgt");

            try
            {
                TokenParser tp = new TokenParser(ClabGrammar, xWriter);

                xWriter.WriteStartDocument();
                xWriter.WriteStartElement("", "problem", "");
                xWriter.WriteAttributeString("xmlns", "xsi", null, "http://www.w3.org/2001/XMLSchema-instance");
                xWriter.WriteAttributeString("xsi", "noNamespaceSchemaLocation", null, "clabschema.xsd");

                String[] inputLines = input.Split('\n');
                foreach (String S in inputLines)
                {
                    if (S.StartsWith("//") || S.StartsWith("/*") || S.StartsWith("*/") || S.StartsWith("*"))
                    {
                        // Handle comments
                        if (S.Contains("Desc:") | S.Contains("Description:"))
                        {
                            commentType = 1;
                            String[] temp = S.Split(':');
                            description += temp[1] + " ";
                        }
                        else if (S.Contains("Auth:") | S.Contains("Author:"))
                        {
                            commentType = 2;
                            String[] temp = S.Split(':');
                            author += temp[1] + " ";
                        }
                        else if (S.Contains("Date:"))
                        {
                            commentType = 3;
                            String[] temp = S.Split(':');
                            date += temp[1] + " ";
                        }
                        else
                        {
                            if (!S.StartsWith("///"))
                            {
                                String temp = S.Substring(2).Trim();
                                switch (commentType)
                                {
                                    case 1:
                                        description += S.Substring(2).Trim();
                                        break;
                                    case 2:
                                        author += S.Substring(2).Trim();
                                        break;
                                    case 3:
                                        date += S.Substring(2).Trim();
                                        break;
                                    default:
                                        break;
                                }
                            }
                        }
                    }
                    else
                    {
                        if (commentType != 0)
                        {
                            xWriter.WriteStartElement("header");
                            if (!description.Equals(""))
                            {
                                xWriter.WriteStartElement("description");
                                xWriter.WriteString(description.Trim());
                                xWriter.WriteEndElement();
                            }
                            if (!author.Equals(""))
                            {
                                xWriter.WriteStartElement("author");
                                xWriter.WriteString(author.Trim());
                                xWriter.WriteEndElement();
                            }
                            if (!date.Equals(""))
                            {
                                xWriter.WriteStartElement("date");
                                xWriter.WriteString(date.Trim());
                                xWriter.WriteEndElement();
                            }
                            xWriter.WriteEndElement();
                            commentType = 0;
                            break;
                        }
                    }
                }
                tp.Parse(input);
                xWriter.WriteEndElement();
                xWriter.WriteEndDocument();
            }
            finally
            {
                if (xWriter != null)
                {
                    xWriter.Flush();
                    xWriter.Close();
                }
            }
            return stream;
        }
    }
}