///////////////////////////////////////////////////////////////////////////////
//
// File: MetricRegex.cpp
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// Description: Implementation of the regular-expression metric.
//
///////////////////////////////////////////////////////////////////////////////

#include <MetricRegex.h>

#include <boost/algorithm/string.hpp>
#include <boost/core/ignore_unused.hpp>
#include <boost/lexical_cast.hpp>

using namespace std;

namespace Nektar
{
std::string MetricRegex::type =
    GetMetricFactory().RegisterCreatorFunction("REGEX", MetricRegex::create);

/**
 * @brief Constructor.
 */
MetricRegex::MetricRegex(TiXmlElement *metric, bool generate)
    : Metric(metric, generate)
{
    // If we are a derived class, do nothing
    if (m_type != "REGEX")
    {
        return;
    }

    // Parse Regex expression
    TiXmlElement *regex = metric->FirstChildElement("regex");
    ASSERTL0(regex, "No Regex defined.");
    ASSERTL0(regex->GetText(), "Failed to get text");
    m_regex = std::regex(regex->GetText(), std::regex::ECMAScript);

    // Parse matching values if not generating.
    if (m_generate)
    {
        return;
    }

    TiXmlElement *matches = metric->FirstChildElement("matches");
    ASSERTL0(matches, "No matches defined.");
    TiXmlElement *match = matches->FirstChildElement("match");
    while (match)
    {
        std::vector<MetricRegexFieldValue> tmp;
        TiXmlElement *field = match->FirstChildElement("field");
        while (field)
        {
            MetricRegexFieldValue v;
            v.m_value           = field->GetText();
            v.m_useTolerance    = false;
            v.m_useIntTolerance = false;

            const char *tol = field->Attribute("tolerance");
            if (tol)
            {
                v.m_useTolerance = true;
                v.m_tolerance    = atof(tol);
            }

            const char *intTol = field->Attribute("inttolerance");
            if (intTol)
            {
                v.m_useIntTolerance = true;
                v.m_intTolerance    = atoi(intTol);
            }

            ASSERTL0(!(intTol && tol),
                     "Cannot use both integer and double tolerances.");

            tmp.push_back(v);
            field = field->NextSiblingElement("field");
        }
        m_matches.push_back(tmp);

        match = match->NextSiblingElement("match");
    }
}

/**
 * @brief Test output against a regex expression and set of matches.
 */
bool MetricRegex::v_Test(std::istream &pStdout, std::istream &pStderr)
{
    boost::ignore_unused(pStdout, pStderr);

    ASSERTL0(m_matches.size(), "No test conditions defined for Regex.");

    // Select istream to use.
    std::istream &is = m_useStderr ? pStderr : pStdout;

    std::vector<MetricRegexFieldValue> &okValues = m_matches[0];
    int nMatch                                   = m_matches.size();
    bool success                                 = true;
    bool matchedTol                              = false;
    std::smatch matches;

    // Process output file line by line searching for regex matches
    std::string line;
    while (getline(is, line) && m_matches.size() > 0)
    {
        matchedTol = true;

        // Test to see if we have a match on this line.
        if (std::regex_match(line, matches, m_regex))
        {
            // Error if no fields in regex then throw an error.
            if (matches.size() == 1)
            {
                cerr << "No test sections in regex!" << endl;
                return false;
            }

            // Check each regex capture group in turn
            for (int i = 1; i < matches.size(); ++i)
            {
                // extract the captured string
                std::string match(matches[i].first, matches[i].second);

                if (okValues[i - 1].m_useTolerance)
                {
                    double val;
                    try
                    {
                        val = fabs(fabs(boost::lexical_cast<double>(
                                       okValues[i - 1].m_value)) -
                                   fabs(boost::lexical_cast<double>(match)));
                    }
                    catch (boost::bad_lexical_cast &e)
                    {
                        cerr << "Could not convert one of " << match
                             << " (match) or " << okValues[i - 1].m_value
                             << " (comparison value) to double" << endl;
                        success = false;
                        continue;
                    }

                    // If the okValues are not within tolerance, failed the
                    // test.
                    if (val > okValues[i - 1].m_tolerance)
                    {
                        if (m_unordered)
                        {
                            matchedTol = false;
                        }
                        else
                        {
                            cerr << "Failed tolerance match." << endl;
                            cerr << "  Expected: " << okValues[i - 1].m_value
                                 << " +/- " << okValues[i - 1].m_tolerance
                                 << endl;
                            cerr << "  Result:   " << match << endl;
                            success = false;
                        }
                    }
                }
                else if (okValues[i - 1].m_useIntTolerance)
                {
                    int val;
                    try
                    {
                        val = abs(
                            boost::lexical_cast<int>(okValues[i - 1].m_value) -
                            boost::lexical_cast<int>(match));
                    }
                    catch (boost::bad_lexical_cast &e)
                    {
                        cerr << "Could not convert one of " << match
                             << " (match) or " << okValues[i - 1].m_value
                             << " (comparison value) to an integer" << endl;
                        success = false;
                        continue;
                    }

                    // If the okValues are not within tolerance, failed the
                    // test.
                    if (val > okValues[i - 1].m_intTolerance)
                    {
                        if (m_unordered)
                        {
                            matchedTol = false;
                        }
                        else
                        {
                            cerr << "Failed tolerance match." << endl;
                            cerr << "  Expected: " << okValues[i - 1].m_value
                                 << " +/- " << okValues[i - 1].m_intTolerance
                                 << endl;
                            cerr << "  Result:   " << match << endl;
                            success = false;
                        }
                    }
                }
                else
                {
                    // Case insensitive match.
                    if (!boost::iequals(match, okValues[i - 1].m_value))
                    {
                        if (m_unordered)
                        {
                            matchedTol = false;
                        }
                        else
                        {
                            cerr << "Failed case-insensitive match." << endl;
                            cerr << "  Expected: " << okValues[i - 1].m_value
                                 << endl;
                            cerr << "  Result:   " << match << endl;
                            success = false;
                        }
                    }
                }
            }

            // Remove this match from the list of matches.
            if (matchedTol)
            {
                m_matches.erase(m_matches.begin());
            }
        }
    }

    if (m_matches.size() != 0)
    {
        cerr << "Expected " << nMatch << " matches but only found "
             << (nMatch - m_matches.size()) << "!" << endl;
        success = false;
    }

    return success;
}

/**
 * @brief Test output against a regex expression and set of matches.
 */
void MetricRegex::v_Generate(std::istream &pStdout, std::istream &pStderr)
{
    boost::ignore_unused(pStderr);

    // Select istream to use.
    std::istream &is = m_useStderr ? pStderr : pStdout;

    std::smatch matches;

    // Process output file line by line searching for regex matches
    std::string line;
    while (getline(is, line))
    {
        // Test to see if we have a match on this line.
        if (std::regex_match(line, matches, m_regex))
        {
            // Error if no fields in regex then throw an error.
            ASSERTL0(matches.size() != 1, "No test sections in regex!");

            vector<MetricRegexFieldValue> okValues;

            for (int i = 1; i < matches.size(); ++i)
            {
                // Create new field.
                MetricRegexFieldValue okValue;
                okValue.m_useTolerance = false;
                okValue.m_value =
                    std::string(matches[i].first, matches[i].second);
                okValues.push_back(okValue);
            }

            m_matches.push_back(okValues);
        }
    }

    // If we are not a derived class then create a new structure.
    if (m_type == "REGEX")
    {
        // Remove matches if they already exist.
        TiXmlElement *matches = m_metric->FirstChildElement("matches");
        if (matches)
        {
            ASSERTL0(m_metric->RemoveChild(matches),
                     "Couldn't remove matches from metric!");
        }

        // Create new matches element.
        matches = new TiXmlElement("matches");
        m_metric->LinkEndChild(matches);

        for (int i = 0; i < m_matches.size(); ++i)
        {
            TiXmlElement *match = new TiXmlElement("match");
            matches->LinkEndChild(match);

            for (int j = 0; j < m_matches[i].size(); ++j)
            {
                TiXmlElement *field = new TiXmlElement("field");
                match->LinkEndChild(field);

                field->SetAttribute("id", boost::lexical_cast<std::string>(j));

                if (m_matches[i][j].m_useTolerance)
                {
                    field->SetAttribute("tolerance",
                                        boost::lexical_cast<std::string>(
                                            m_matches[i][j].m_tolerance));
                }

                field->LinkEndChild(new TiXmlText(m_matches[i][j].m_value));
            }
        }
    }
}
} // namespace Nektar
