/*  Copyright (c) MediaArea.net SARL. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license that can
 *  be found in the License.html file in the root of the source tree.
 */

//---------------------------------------------------------------------------
#ifdef __BORLANDC__
    #pragma hdrstop
#endif
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
#include "Common/Version.h"
#include "Checker.h"

#include <functional>
#include <algorithm>
#include <cstdlib>
#include <cstring>
#include <sstream>

//---------------------------------------------------------------------------
using namespace tfsxml;

//TODO: mmt
//TODO: reference_file

//---------------------------------------------------------------------------
// Helpers
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
std::ostream& operator<<(std::ostream& out, tfsxml_string const& in)
{
    if (in.len)
        out << std::string(in.buf, in.len);

    return out;
}

//---------------------------------------------------------------------------
std::string xml_encode(const std::string& data)
{
    std::stringstream ss;
    for (size_t pos=0; pos<data.size(); pos++)
    {
        switch (data[pos])
        {
            case '\'': ss << "&apos;"; break;
            case '"': ss << "&quot;"; break;
            case '&': ss << "&amp;"; break;
            case '<': ss << "&lt;"; break;
            case '>': ss << "&gt;"; break;
            case '\t': ss << "&#x9;"; break;
            case '\n': ss << "&#xA;"; break;
            case '\r':
                ss << "&#xA;";
                if (pos+1<data.size() && data[pos+1]=='\n') // translate the #xD #xA sequence to a single #xA character
                    pos++;
            break;
            default: if ((unsigned char)data[pos]>=0x20) ss << data[pos]; // Ignore others control characters
        }
    }
    return ss.str();
}

//---------------------------------------------------------------------------
std::string indent(size_t level)
{
    return std::string( level*2, ' ');
}

//---------------------------------------------------------------------------
int tfsxml_next_named(tfsxml_string* tfsxml_priv, tfsxml_string* result, const char* name)
{
    while (!tfsxml_next(tfsxml_priv, result))
    {
        if (!tfsxml_strcmp_charp(*result, name))
            return 0;
    }

    return -1;
}

//---------------------------------------------------------------------------
int tfsxml_hasvalue(tfsxml_string* priv)
{
    const char* buf = priv->buf;
    unsigned len = priv->len;
    while (len)
    {
        len--;
        switch (*buf)
        {
            case '\n':
            case '\t':
            case '\r':
            case ' ':
                break;
            case '<':
                if (!len)
                    return 1;
                buf++;
                switch (*buf)
                {
                    case '!':
                    case '/':
                        return 0;
                    default:
                        return -1;
                }
            default:
                return 0;
        }
    }
    return 1;
}

//---------------------------------------------------------------------------
std::string tokenize(const std::string& scope, const std::string& list, const std::string& delimiter)
{
    std::stringstream ss;

    //TODO: mmt
    if (scope.empty() || scope=="mi")
    {
        std::istringstream iss(list);
        for (std::string token; std::getline(iss, token, '/');)
            ss << "/mi:" << token;
    }

    return ss.str();
}


//---------------------------------------------------------------------------
namespace MediaConch {

//---------------------------------------------------------------------------
// Policy
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
PolicyChecker::PolicyElement::PolicyElement() : resolved(false), pass_count(0), info_count(0), warn_count(0), fail_count(0)
{
}

//---------------------------------------------------------------------------
PolicyChecker::PolicyElement::~PolicyElement()
{
    while (children.size())
    {
        delete children.back();
        children.pop_back();
    }
}

//---------------------------------------------------------------------------
PolicyChecker::Element::Level PolicyChecker::PolicyElement::error_level()
{
    if (level=="info")
        return LEVEL_INFO;
    else if (level=="warn")
        return LEVEL_WARN;
    else if (level=="fail")
        return LEVEL_FAIL;

    return LEVEL_NONE;
}

//---------------------------------------------------------------------------
void PolicyChecker::PolicyElement::resolve()
{
    for (size_t pos=0; pos<children.size(); pos++)
    {
        switch (children[pos]->result())
        {
        case RESULT_PASS:
            pass_count++; break;
        case RESULT_INFO:
            info_count++; break;
        case RESULT_WARN:
            warn_count++; break;
        case RESULT_FAIL:
            fail_count++; break;
        default:
            break;
        }
    }

    resolved=true;
}

//---------------------------------------------------------------------------
PolicyChecker::Element::Result PolicyChecker::PolicyElement::result()
{
    if(!resolved)
        resolve();

    Result to_return=RESULT_PASS;

    if (type=="and")
    {
        if (fail_count)
            to_return=RESULT_FAIL;
        else if (warn_count)
            to_return=RESULT_WARN;
        else if (info_count)
            to_return=RESULT_INFO;
        else
            to_return=RESULT_PASS;
    }
    else if (type=="or")
    {
        if (fail_count && !warn_count && !info_count && !pass_count)
            to_return=RESULT_FAIL;
        else if (warn_count && !info_count && !pass_count)
            to_return=RESULT_WARN;
        else if (info_count && !pass_count)
            to_return=RESULT_INFO;
        else
            to_return=RESULT_PASS;
    }

    if (error_level()>LEVEL_NONE)
    {
        if (to_return>RESULT_INFO && error_level()==LEVEL_INFO)
            to_return=RESULT_INFO;
        else if (to_return>RESULT_WARN && error_level()==LEVEL_WARN)
            to_return=RESULT_WARN;
    }



    return to_return;
}

//---------------------------------------------------------------------------
std::string PolicyChecker::PolicyElement::to_string(size_t level, bool verbose)
{
    if(!resolved)
        resolve();

    std::string outcome_str;
    switch (result())
    {
    case RESULT_FAIL:
        outcome_str="fail"; break;
    case RESULT_WARN:
        outcome_str="warn"; break;
    case RESULT_INFO:
        outcome_str="info"; break;
    case RESULT_PASS:
        outcome_str="pass"; break;
    }

    std::stringstream ss;

    ss << indent(level) << "<policy name=\"" << xml_encode(name) << "\" type=\"" << xml_encode(type);
    if (!this->level.empty())
        ss << "\" level=\"" << xml_encode(this->level);
    ss << "\" rules_run=\"" << children.size() << "\" pass_count=\"" << pass_count << "\" info_count=\"" << info_count << "\" warn_count=\"" << warn_count
       << "\" fail_count=\"" << fail_count << "\" outcome=\"" << outcome_str << "\">" << std::endl;
    level++;
    if (!description.empty())
        ss << indent(level) << "<description>" << description << "</description>" << std::endl;
    for (size_t pos=0; pos<tags.size(); pos++)
        ss << indent(level) << "<tag>" << tags[pos] << "</tag>" << std::endl;
    for (size_t pos=0; pos<children.size(); pos++)
        ss << children[pos]->to_string(level, verbose);
    level--;
    ss << indent(level) << "</policy>" << std::endl;

    return ss.str();
}

//---------------------------------------------------------------------------
// Rule
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
PolicyChecker::RuleElement::RuleElement() : resolved(false), pass(false), tracks(0), source(NULL)
{
}

//---------------------------------------------------------------------------
PolicyChecker::RuleElement::~RuleElement()
{
    if (source)
        delete source;
}

//---------------------------------------------------------------------------
void PolicyChecker::RuleElement::reset()
{
    resolved=false;
    pass=false;
    tracks=0;
    values.clear();
    if (source)
        source->values.clear();
}

//---------------------------------------------------------------------------
bool  PolicyChecker::RuleElement::compare(const std::string& v1, const std::string& v2)
{
    bool to_return = false;

    char* val_end=NULL;
    double val = strtod(v2.c_str(), &val_end);
    char* ref_end=NULL;
    double ref = strtod(v1.c_str(), &ref_end);

    if (operand=="starts with")
    {
        to_return = v2.rfind(v1, 0) == 0;
    }
    else if (operand=="must not start with")
    {
        to_return = v2.rfind(v1, 0) != 0;
    }
    else if (operand == "<")
    {
        if (!strlen(val_end) && !strlen(ref_end))
            to_return = val < ref;
        else
            to_return = strcmp(v2.c_str(), v1.c_str()) < 0;
    }
    else if (operand == "<=")
    {
        if (!strlen(val_end) && !strlen(ref_end))
            to_return = val <= ref;
        else
            to_return = strcmp(v2.c_str(), v1.c_str()) <= 0;
    }
    else if (operand == "=")
    {
        if (!strlen(val_end) && !strlen(ref_end))
            to_return = val == ref;
        else
            to_return = strcmp(v2.c_str(), v1.c_str()) == 0;
    }
    else if (operand == "!=")
    {
        if (!strlen(val_end) && !strlen(ref_end))
            to_return = val != ref;
        else
            to_return = strcmp(v2.c_str(), v1.c_str()) != 0;
    }
    else if (operand == ">=")
    {
        if (!strlen(val_end) && !strlen(ref_end))
            to_return = val >= ref;
        else
            to_return = strcmp(v2.c_str(), v1.c_str()) >= 0;
    }
    else if (operand == ">")
    {
        if (!strlen(val_end) && !strlen(ref_end))
            to_return = val > ref;
        else
            to_return = strcmp(v2.c_str(), v1.c_str()) > 0;
    }

    if (!to_return)
        failing_values.push_back(v2);

    return to_return;
}

//---------------------------------------------------------------------------
PolicyChecker::Element::Level PolicyChecker::RuleElement::error_level()
{
    if (level=="info")
        return LEVEL_INFO;
    else if (level=="warn")
        return LEVEL_WARN;
    else if (level=="fail")
        return LEVEL_FAIL;

    return LEVEL_NONE;
}

//---------------------------------------------------------------------------
void PolicyChecker::RuleElement::resolve()
{
    if (operand=="" || operand=="exists")
    {
        if (occurrence=="all")
            pass=!values.empty() && values.size()==tracks;
        else
            pass=!values.empty();
    }
    else if (operand=="must not exist")
    {
        if (occurrence=="any")
            pass=values.size()<tracks;
        else // keep old behavior for legacy "*" value
            pass=values.empty();
    }
    else if (operand=="starts with" || operand=="must not start with" || operand=="<" || operand=="<=" || operand=="="  || operand=="!=" || operand==">=" || operand==">")
    {
        std::vector<bool> results;

        if (values.empty())
           pass=operand=="must not start with" ? true : false;
        else
        {
            for (std::pair<const char*, std::string> value : values)
            {
                if (source)
                {
                    std::vector<bool> r2;
                    for (std::pair<const char*, std::string> v2 : source->values)
                    {
                        if ((occurrence.empty() || occurrence=="any" || occurrence=="*" ||
                            source->occurrence.empty() || source->occurrence=="all" ||
                            source->occurrence=="any" || source->occurrence=="*") &&
                            v2.first==value.first)
                            continue;

                        r2.push_back(compare(v2.second, value.second));
                    }

                    if (r2.empty())
                        continue;

                    if (source->occurrence=="all")
                        results.push_back(std::all_of(r2.begin(), r2.end(), [this](bool result) { return result; }));
                    else
                        results.push_back(std::any_of(r2.begin(), r2.end(), [this](bool result) { return result; }));
                }
                else
                    results.push_back(compare(requested, value.second));
            }

            if (!results.empty())
            {
                if (occurrence=="all")
                    pass=std::all_of(results.begin(), results.end(), [this](bool result) { return result; });
                else
                    pass=std::any_of(results.begin(), results.end(), [this](bool result) { return result; });
            }
        }
    }

    resolved=true;
}

//---------------------------------------------------------------------------
PolicyChecker::Element::Result PolicyChecker::RuleElement::result()
{
    if(!resolved)
        resolve();

    if (!pass)
    {
        if (error_level()==LEVEL_INFO)
            return RESULT_INFO;
        else if (error_level()==LEVEL_WARN)
            return RESULT_WARN;
        else
            return RESULT_FAIL;
    }
    return RESULT_PASS;
}

//---------------------------------------------------------------------------
std::string PolicyChecker::RuleElement::to_string(size_t level, bool verbose)
{
    std::stringstream ss;

    std::string outcome_str;
    switch (result())
    {
    case RESULT_FAIL:
        outcome_str="fail"; break;
    case RESULT_WARN:
        outcome_str="warn"; break;
    case RESULT_INFO:
        outcome_str="info"; break;
    case RESULT_PASS:
        outcome_str="pass"; break;
    }

    std::string value_str;
    if (result()>RESULT_PASS)
        value_str=failing_values.size() ? failing_values.front() : std::string();
    else if (verbose)
        value_str=values.size() ? values.begin()->second : std::string();

    ss << indent(level) << "<rule name=\"" << xml_encode(name) << "\"";
    if (!scope.empty())
        ss << " scope=\"" << xml_encode(scope) << "\"";
    ss << " value=\"" << xml_encode(field)
       << "\" tracktype=\"" << xml_encode(tracktype)
       << "\" occurrence=\"" << (occurrence.size() ? xml_encode(occurrence) : "*")
       << "\" operator=\"" << xml_encode(operand)
       << "\" xpath=\"" << xpath << "\"";
    if (!this->level.empty())
        ss << " level=\"" << xml_encode(this->level) << "\"";
    if (result()>RESULT_PASS || verbose)
        ss << " requested=\""
           << (source && source->values.size() ? xml_encode(source->values.begin()->second) : xml_encode(requested))
           << "\" actual=\"" << xml_encode(value_str) << "\"";
    ss << " outcome=\"" << outcome_str << "\"";

    if (source)
    {
        ss << ">" << std::endl;

        ss << indent(level +1) << "<source";
        if (!source->scope.empty())
            ss << " scope=\"" << xml_encode(source->scope) << "\"";
        ss << " value=\"" << xml_encode(source->field)
           << "\" tracktype=\"" << xml_encode(source->tracktype)
           << "\" occurrence=\"" << (source->occurrence.size() ? xml_encode(source->occurrence) : "*")
           << "\"/>" << std::endl;

        ss << indent(level) << "</rule>" << std::endl;
    }
    else
        ss << "/>" << std::endl;

    return ss.str();
}

//---------------------------------------------------------------------------
// PolicyChecker
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
PolicyChecker::PolicyChecker() : supported(true), full(false)
{
}

//---------------------------------------------------------------------------
PolicyChecker::~PolicyChecker()
{
    while (policies.size())
    {
        delete policies.back();
        policies.pop_back();
    }
}

//---------------------------------------------------------------------------
bool PolicyChecker::is_policy_supported()
{
    return supported;
}


//---------------------------------------------------------------------------
bool PolicyChecker::full_parse()
{
    return full;
}

//---------------------------------------------------------------------------
PolicyChecker::RuleElement* PolicyChecker::parse_rule(tfsxml_string& tfsxml_priv)
{
    RuleElement* rule=new RuleElement();

    tfsxml_string attribute_name;
    tfsxml_string attribute_value;
    while (!tfsxml_attr(&tfsxml_priv, &attribute_name, &attribute_value))
    {
        if (!tfsxml_strcmp_charp(attribute_name, "name"))
            rule->name=tfsxml_decode(attribute_value);
        else if (!tfsxml_strcmp_charp(attribute_name, "scope"))
            rule->scope=tfsxml_decode(attribute_value);
        else if (!tfsxml_strcmp_charp(attribute_name, "level"))
            rule->level=tfsxml_decode(attribute_value);
        else if (!tfsxml_strcmp_charp(attribute_name, "value"))
            rule->field=tfsxml_decode(attribute_value);
        else if (!tfsxml_strcmp_charp(attribute_name, "tracktype"))
            rule->tracktype=tfsxml_decode(attribute_value);
        else if (!tfsxml_strcmp_charp(attribute_name, "occurrence"))
            rule->occurrence=tfsxml_decode(attribute_value);
        else if (!tfsxml_strcmp_charp(attribute_name, "operator"))
            rule->operand=tfsxml_decode(attribute_value);
    }

    if (!tfsxml_hasvalue(&tfsxml_priv))
    {
        tfsxml_string value;
        if (!tfsxml_value(&tfsxml_priv, &value))
            rule->requested = std::string(value.buf, value.len);
    }
    else
    {
        if (!tfsxml_enter(&tfsxml_priv))
        {
            tfsxml_string value;
            while (!tfsxml_next(&tfsxml_priv, &value))
            {
                if (!tfsxml_strcmp_charp(value, "source"))
                {
                    if (rule->source)
                        delete rule->source;
                    rule->source = new RuleElement::Source();
                    while (!tfsxml_attr(&tfsxml_priv, &attribute_name, &attribute_value))
                    {
                        if (!tfsxml_strcmp_charp(attribute_name, "scope"))
                            rule->source->scope=tfsxml_decode(attribute_value);
                        else if (!tfsxml_strcmp_charp(attribute_name, "value"))
                            rule->source->field=tfsxml_decode(attribute_value);
                        else if (!tfsxml_strcmp_charp(attribute_name, "tracktype"))
                            rule->source->tracktype=tfsxml_decode(attribute_value);
                        else if (!tfsxml_strcmp_charp(attribute_name, "occurrence"))
                            rule->source->occurrence=tfsxml_decode(attribute_value);
                    }

                    // Check for currently unsupported features
                    if (rule->scope=="mmt")
                        supported=false;

                    if (rule->scope.empty() || rule->scope=="mi")
                    {
                        std::stringstream ss;
                        ss << "mi:MediaInfo/mi:track[@type='"
                           << rule->source->tracktype << "']["
                           << ((rule->source->occurrence.empty() || rule->source->occurrence=="all" || rule->source->occurrence=="any") ? "*" : rule->source->occurrence)
                           << "]"
                           << tokenize(rule->source->scope, rule->source->field, "/");
                        rule->source->path=parse_path(ss.str());
                    }
                    break;
                }
            }
            tfsxml_leave(&tfsxml_priv);
        }
    }

    // Check for presence of _StringX or TimeCode* element in policy
    size_t index=rule->field.find_last_not_of("0123456789");
    if ((index!=std::string::npos && index>=6 && rule->field.substr(index-6, 7)=="_String") || rule->field.find("TimeCode")==0 || rule->field.rfind("_Total")==rule->field.size()-6)
        full=true;

    // Check for currently unsupported features
    if (rule->scope=="mmt" || rule->requested =="compare")
        supported=false;

    if (rule->scope.empty() || rule->scope=="mi")
    {
        std::stringstream ss;
        ss << "mi:MediaInfo/mi:track[@type='"
           << rule->tracktype
           << "']["
           << ((rule->occurrence.empty() || rule->occurrence=="all" || rule->occurrence=="any") ? "*" : rule->occurrence)
           << "]" << tokenize(rule->scope, rule->field, "/");
        rule->xpath=ss.str();
        rule->path=parse_path(rule->xpath);
    }

    rules.push_back(rule);

    return rule;
}

//---------------------------------------------------------------------------
PolicyChecker::PolicyElement* PolicyChecker::parse_policy(tfsxml_string& tfsxml_priv)
{
    PolicyElement* policy=new PolicyElement();

    tfsxml_string attribute_name;
    tfsxml_string attribute_value;
    while (!tfsxml_attr(&tfsxml_priv, &attribute_name, &attribute_value))
    {
        if (!tfsxml_strcmp_charp(attribute_name, "name"))
            policy->name=tfsxml_decode(attribute_value);
        else if (!tfsxml_strcmp_charp(attribute_name, "type"))
            policy->type=tfsxml_decode(attribute_value);
        else if (!tfsxml_strcmp_charp(attribute_name, "level"))
            policy->level=tfsxml_decode(attribute_value);
        else if (!tfsxml_strcmp_charp(attribute_name, "version"))
            policy->version=tfsxml_decode(attribute_value);
    }

   tfsxml_string result;
    if (!tfsxml_enter(&tfsxml_priv))
    {
        while (!tfsxml_next(&tfsxml_priv, &result))
        {
            if (!tfsxml_strcmp_charp(result, "description"))
            {
                tfsxml_string result;
                if (!tfsxml_value(&tfsxml_priv, &result))
                    policy->description=std::string(result.buf, result.len);
            }
            else if (!tfsxml_strcmp_charp(result, "tag"))
            {
                tfsxml_string result;
                if (!tfsxml_value(&tfsxml_priv, &result))
                    policy->tags.push_back(std::string(result.buf, result.len));
            }
            else if (!tfsxml_strcmp_charp(result, "policy"))
                policy->children.push_back(parse_policy(tfsxml_priv));
            else if (!tfsxml_strcmp_charp(result, "rule"))
                policy->children.push_back(parse_rule(tfsxml_priv));
        }
    }

    return policy;
}

//---------------------------------------------------------------------------
void PolicyChecker::add_policy(const std::string& policy)
{
    tfsxml_string tfsxml_priv;
    tfsxml_string result;

    tfsxml_init(&tfsxml_priv, (const void*)policy.c_str(), policy.size(), 0);
    while (!tfsxml_next(&tfsxml_priv, &result))
    {
        if (!tfsxml_strcmp_charp(result, "policy"))
        {
            PolicyElement* p=parse_policy(tfsxml_priv);
            if(p)
                policies.push_back(p);
            break;
        }
    }
}

//---------------------------------------------------------------------------
void PolicyChecker::parse_node(tfsxml_string& tfsxml_priv, std::vector<RuleElement*> rules, std::vector<RuleElement*> sources, size_t level)
{
    if (rules.empty() && sources.empty())
        return;

    if (!tfsxml_enter(&tfsxml_priv))
    {
        std::map<PathElement*, size_t> occurrences;

        tfsxml_string result;
        while (!tfsxml_next(&tfsxml_priv, &result))
        {
            const char* id = result.buf;
            std::vector<RuleElement*> matching_rules;
            std::vector<RuleElement*> matching_sources;
            for (size_t pos = 0; pos < rules.size(); pos++)
            {
                if (level < rules[pos]->path.size() && path_is_matching(tfsxml_priv, result, rules[pos]->path[level], occurrences[&rules[pos]->path[level]]))
                {
                    if (level == 1 && (rules[pos]->scope.empty() || rules[pos]->scope == "mi")) // at track level
                        rules[pos]->tracks++;

                    if (level == rules[pos]->path.size() - 1)
                    {
                        tfsxml_string tfsxml_priv_copy = tfsxml_priv;
                        tfsxml_string value;
                        if (!tfsxml_value(&tfsxml_priv_copy, &value))
                            rules[pos]->values[id] = std::string(value.buf, value.len);
                    }
                    else
                        matching_rules.push_back(rules[pos]);
                }
            }

            for (size_t pos = 0; pos < sources.size(); pos++)
            {
                if (sources[pos]->source && level < sources[pos]->source->path.size() && path_is_matching(tfsxml_priv, result, sources[pos]->source->path[level], occurrences[&sources[pos]->source->path[level]]))
                {
                    if (level == sources[pos]->source->path.size() - 1)
                    {
                        tfsxml_string tfsxml_priv_copy = tfsxml_priv;
                        tfsxml_string value;
                        if (!tfsxml_value(&tfsxml_priv_copy, &value))
                            sources[pos]->source->values[id] = std::string(value.buf, value.len);
                    }
                    else
                        matching_sources.push_back(sources[pos]);
                }
            }

            if (!matching_rules.empty() || !matching_sources.empty())
                parse_node(tfsxml_priv, matching_rules, matching_sources, level + 1);
        }
    }
}

//---------------------------------------------------------------------------
int PolicyChecker::analyze(const std::string& report, bool verbose, std::string& out)
{
    std::stringstream ss;
    size_t level=0;
    bool creating_library_present=false;

    ss << indent(level++) << "<MediaConch xmlns=\"https://mediaarea.net/mediaconch\" xmlns:mmt=\"https://mediaarea.net/micromediatrace\" xmlns:mi=\"https://mediaarea.net/mediainfo\" version=\"0.3\">" << std::endl;
    ss << indent(level  ) << "<creatingApplication version=\"" MEDIACONCH_VERSION "\" url=\"https://mediaarea.net/MediaConch\">MediaConch</creatingApplication>" << std::endl;
    tfsxml_string tfsxml_priv;
    tfsxml_string result;
    tfsxml_init(&tfsxml_priv, (const void*)report.c_str(), report.size(), 0);
    while (!tfsxml_next_named(&tfsxml_priv, &result, "MediaArea"))
    {
        if (!tfsxml_enter(&tfsxml_priv))
        {
            while (!tfsxml_next(&tfsxml_priv, &result))
            {
                if (!tfsxml_strcmp_charp(result, "media"))
                {
                    std::string media;
                    tfsxml_string attribute_name;
                    tfsxml_string attribute_value;
                    while (!tfsxml_attr(&tfsxml_priv, &attribute_name, &attribute_value))
                    {
                        if (!tfsxml_strcmp_charp(attribute_name, "ref"))
                            media=std::string(attribute_value.buf, attribute_value.len);
                    }

                    ss << indent(level++) << "<media ref=\"" << media << "\">" << std::endl;
                    parse_node(tfsxml_priv, rules, rules, 0);
                    for (size_t pos=0; pos<policies.size(); pos++)
                        ss << policies[pos]->to_string(level, verbose);
                    ss << indent(--level) << "</media>" << std::endl;

                    // reset states
                    for (size_t pos=0; pos < rules.size(); pos++)
                        rules[pos]->reset();
                }
                else if (!creating_library_present && !tfsxml_strcmp_charp(result, "creatingLibrary"))
                {
                    ss << indent(level) << "<creatingLibrary";

                    tfsxml_string attribute_name, attribute_value, content;
                    while (!tfsxml_attr(&tfsxml_priv, &attribute_name, &attribute_value))
                    {
                       ss << " " << attribute_name;
                        if (attribute_value.len)
                            ss << "=\"" << attribute_value << "\"";
                    }

                    if (!tfsxml_value(&tfsxml_priv, &content))
                        ss << ">" << content << "</creatingLibrary>";
                    else
                        ss << "/>";
                    ss << std::endl;

                    creating_library_present=true;
                }
            }
        }
    }
    ss << indent(--level) << "</MediaConch>" << std::endl;

    out = ss.str();
    return 0;
}

}

#ifdef __EMSCRIPTEN__
#include <emscripten/bind.h>
EMSCRIPTEN_BINDINGS(mediaconch_policychecker) {
    emscripten::class_<MediaConch::PolicyChecker>("PolicyChecker")
        .constructor()
        .function("is_policy_supported", &MediaConch::PolicyChecker::is_policy_supported)
        .function("full_parse", &MediaConch::PolicyChecker::full_parse)
        .function("add_policy", &MediaConch::PolicyChecker::add_policy)
        .function("analyze", emscripten::optional_override([](MediaConch::PolicyChecker& self, const std::string& report, bool verbose) {
            std::string out;
            self.MediaConch::PolicyChecker::analyze(report, verbose, out);

            return out;
        }))
    ;
}
#endif //__EMSCRIPTEN__