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/* ----------------------------------------------------------------------- *

 * This file is part of GEL, http://www.imm.dtu.dk/GEL

 * Copyright (C) the authors and DTU Informatics

 * For license and list of authors, see ../../doc/intro.pdf

 * ----------------------------------------------------------------------- */

#include <fstream>

#include <string>

#include <sstream>

#include <cstring>

#include <algorithm>

#include <list>

#include "XmlParser.h"

#include "string_utils.h"

namespace Util

{

    using std::string;

    using std::map;

    using std::list;

    using std::pair;

    using std::ifstream;

    using std::ostream;

    using std::ostringstream;

    using std::ios_base;

    using std::max;

    using std::cerr;

    using std::endl;

    /////////////////////////////////////////////////////////////////

    // String handling

    /////////////////////////////////////////////////////////////////

    void parse_attribs(const string& s, map<string, string>& result)

    {

        string name1, name2;

        list<string> atts;

        trim_split(s, atts, "=");

        if(atts.empty())

            return;

        get_last(atts.front(), name1);

        list<string>::iterator i = atts.begin();

        list<string>::iterator end = atts.end();

        if(i == --end)

            return;

        for(++i; i != end; ++i)

        {

            get_last(*i, name2);

            result[trim(name1)] = trim(*i, " \"");

            name1 = name2;

        }

        result[trim(name1)] = trim(*end, " \"");

    }

    /////////////////////////////////////////////////////////////////

    // File handling

    /////////////////////////////////////////////////////////////////

    ifstream& seek_string(ifstream& in, const string& s, const size_t bufsize = 100)

    {

        const int bsize = static_cast<int>(max(s.size(), bufsize));

        const int n = static_cast<int>(s.size());

        char* buf = new char[bsize + 1];

        char s0 = s[0];

        in.get(buf, bsize, s0);

        in.clear();

        in.read(buf, n);

        buf[n] = '\0';

        while(in && strcmp(s.c_str(), buf) != 0)

        {

            in.get(buf, bsize, s0);

            in.clear();

            in.read(buf, n);

            buf[n] = '\0';

        }

        delete [] buf;

        return in;

    }

    ifstream& read_until(ifstream& in, string& s_in, const string s, const size_t bufsize = 500)

    {

        const int bsize = static_cast<int>(max(s.size(), bufsize));

        const int n = static_cast<int>(s.size());

        char* buf = new char[bsize + 1];

        char s0 = s[0];

        ostringstream ostr;

        in.get(buf, bsize, s0);

        ostr << buf;

        in.clear();

        in.read(buf, n);

        buf[n] = '\0';

        while(in && strcmp(s.c_str(), buf) != 0)

        {

            ostr << buf;

            in.get(buf, bsize, s0);

            ostr << buf;

            in.clear();

            in.read(buf, n);

            buf[n] = '\0';

        }

        s_in = ostr.str();

        delete [] buf;

        return in;

    }

    ifstream& operator>>(ifstream& in, XmlHead& fhead)

    {

        seek_string(in, "<?xml");

        string head;

        read_until(in, head, "?>");

        fhead.is_xml = in.good();

        parse_attribs(head, fhead.atts);

        return in;

    }

    ifstream& operator>>(ifstream& in, XmlElement& elem)

    {

        seek_string(in, "<");

        string head;

        read_until(in, head, ">");

        if(head.empty() || head[0] == '!') return in;

        if(head[0] == '/')

        {

            if(elem.parent && elem.parent->name == head.substr(1))

                in.setstate(ios_base::eofbit);

            else

                elem.name = "";

            return in;

        }

        bool has_body = true;

        if(head[head.size() - 1] == '/')

        {

            has_body = false;

            head.erase(head.size() - 1);

        }

        get_first(head, elem.name);

        elem.name = trim(elem.name);

        parse_attribs(head, elem.atts);

        if(has_body)

        {

            delete elem.body;

            elem.body = new XmlBody(elem.doc);

            elem.body->element.parent = &elem;

            read_until(in, elem.body->text, "<");

            in.putback('<');

        }

        return in;

    }

    ifstream& operator>>(ifstream& in, XmlBody& body)

    {

        read_until(in, body.text, "<");

        in.putback('<');

        return in;

    }

    /////////////////////////////////////////////////////////////////

    // Methods

    /////////////////////////////////////////////////////////////////

    XmlElement::~XmlElement()

    {

        delete body;

    }

    void XmlBody::process_element()

    {

        if(!doc) return;

        if((doc->infile >> element) && !doc->infile.eof())

        {

            XmlElementHandler h = doc->handlers[element.name];

            if(h)

                h(element);

            else

                element.process_elements();

        }

    }

    void XmlElement::process_elements()

    {

        if(!doc) return;

        if(!body) return;

        while((doc->infile >> body->element) && !doc->infile.eof())

        {

            XmlElementHandler h = doc->handlers[body->element.name];

            if(h)

                h(body->element);

            else

                body->element.process_elements();

        }

        doc->infile.clear();

    }

    XmlDoc::XmlDoc(const char *filename)

    : infile(filename), body(0)

    {

        if(!infile)

        {

            cerr << "cannot open input file" << filename << endl;

            return;

        }

        if(infile >> head)

            infile >> body;

        else

            cerr << filename << " is not a valid xml-file" << endl;

        body.doc = this;

        body.element.doc = this;

    }

    void XmlDoc::process_elements()

    {

        while(!infile.eof() && (infile >> body.element))

        {

            XmlElementHandler h = handlers[body.element.name];

            if(h)

                h(body.element);

            else

                body.element.process_elements();

        }

        infile.clear();

    }

    /////////////////////////////////////////////////////////////////

    // Output handling

    /////////////////////////////////////////////////////////////////

    ostream& operator<<(ostream& out, const pair<string, string>& attrib)

    {

        return out << attrib.first << "=\"" << attrib.second << "\"";

    }

    ostream& operator<<(ostream& out, const XmlHead& head)

    {

        out << "<?xml";

        for(map<string, string>::const_iterator i = head.atts.begin(); i != head.atts.end(); ++i)

            out << " " << *i;

        out << "?>";

        return out;

    }

}