/* ============================================================
*
* This file is a part of the rekonq project
*
* Copyright (C) 2009 by Jakub Wieczorek <faw217@gmail.com>
* Copyright (C) 2009 by Christian Franke <cfchris6@ts2server.com>
* Copyright (C) 2009 by Fredy Yanardi <fyanardi@gmail.com>
* Copyright (C) 2010-2011 by Lionel Chauvin <megabigbug@yahoo.fr>
* Copyright (C) 2010-2011 by Andrea Diamantini <adjam7 at gmail dot com>
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License or (at your option) version 3 or any later version
* accepted by the membership of KDE e.V. (or its successor approved
* by the membership of KDE e.V.), which shall act as a proxy
* defined in Section 14 of version 3 of the license.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
* ============================================================ */


// Self Includes
#include "opensearchengine.h"
#include "suggestionparser.h"

// Qt Includes
#include <QtCore/QRegExp>
#include <QtCore/QFile>
#include <QtCore/QFileInfo>
#include <QtCore/QDateTime>

// KDE Includes
#include <KStandardDirs>


OpenSearchEngine::OpenSearchEngine(QObject *parent)
    : QObject(parent)
    , m_parser(0)
{
}


OpenSearchEngine::~OpenSearchEngine()
{
    if (m_parser) 
    {
        delete m_parser;
    }
}


QString OpenSearchEngine::parseTemplate(const QString &searchTerm, const QString &searchTemplate)
{
    QString language = QLocale().name();
    // Simple conversion to RFC 3066.
    language = language.replace(QL1C('_'), QL1C('-'));
    QString country = language;
    country = (country.remove(0, country.indexOf(QL1C('-'))+1)).toLower();
    const int firstDashPosition = country.indexOf(QL1C('-'));
    if (firstDashPosition >= 0)
        country = country.mid(firstDashPosition+1);

    QString result = searchTemplate;
    result.replace(QL1S("{count}"), QL1S("20"));
    result.replace(QL1S("{startIndex}"), QL1S("0"));
    result.replace(QL1S("{startPage}"), QL1S("0"));
    result.replace(QL1S("{language}"), language);
    result.replace(QL1S("{country}"), country.toLower());
    result.replace(QL1S("{inputEncoding}"), QL1S("UTF-8"));
    result.replace(QL1S("{outputEncoding}"), QL1S("UTF-8"));
    result.replace(QL1S("{searchTerms}"), searchTerm);

    return result;
}


QString OpenSearchEngine::name() const
{
    return m_name;
}


void OpenSearchEngine::setName(const QString &name)
{
    m_name = name;
}


QString OpenSearchEngine::description() const
{
    return m_description;
}


void OpenSearchEngine::setDescription(const QString &description)
{
    m_description = description;
}


QString OpenSearchEngine::searchUrlTemplate() const
{
    return m_searchUrlTemplate;
}


void OpenSearchEngine::setSearchUrlTemplate(const QString &searchUrlTemplate)
{
    m_searchUrlTemplate = searchUrlTemplate;
}


KUrl OpenSearchEngine::searchUrl(const QString &searchTerm) const
{
    if (m_searchUrlTemplate.isEmpty()) 
    {
        return KUrl();
    }

    KUrl retVal = KUrl::fromEncoded(parseTemplate(searchTerm, m_searchUrlTemplate).toUtf8());

    QList<Parameter>::const_iterator i;
    for ( i = m_searchParameters.constBegin(); i != m_searchParameters.constEnd(); ++i) 
    {
        retVal.addQueryItem(i->first, parseTemplate(searchTerm, i->second));
    }

    return retVal;
}


bool OpenSearchEngine::providesSuggestions() const
{
    return !m_suggestionsUrlTemplate.isEmpty();
}


QString OpenSearchEngine::suggestionsUrlTemplate() const
{
    return m_suggestionsUrlTemplate;
}


void OpenSearchEngine::setSuggestionsUrlTemplate(const QString &suggestionsUrlTemplate)
{
    m_suggestionsUrlTemplate = suggestionsUrlTemplate;
}


KUrl OpenSearchEngine::suggestionsUrl(const QString &searchTerm) const
{
    if (m_suggestionsUrlTemplate.isEmpty()) 
    {
        return KUrl();
    }

    KUrl retVal = KUrl::fromEncoded(parseTemplate(searchTerm, m_suggestionsUrlTemplate).toUtf8());

    QList<Parameter>::const_iterator i;
    for( i = m_suggestionsParameters.constBegin(); i != m_suggestionsParameters.constEnd(); ++i)
    {
        retVal.addQueryItem(i->first, parseTemplate(searchTerm, i->second));
    }
    return retVal;
}


QList<OpenSearchEngine::Parameter> OpenSearchEngine::searchParameters() const
{
    return m_searchParameters;
}


void OpenSearchEngine::setSearchParameters(const QList<Parameter> &searchParameters)
{
    m_searchParameters = searchParameters;
}


QList<OpenSearchEngine::Parameter> OpenSearchEngine::suggestionsParameters() const
{
    return m_suggestionsParameters;
}


void OpenSearchEngine::setSuggestionsParameters(const QList<Parameter> &suggestionsParameters)
{
    m_suggestionsParameters = suggestionsParameters;
}


void OpenSearchEngine::setSuggestionParser(SuggestionParser *parser)
{
    m_parser = parser;
}


QString OpenSearchEngine::imageUrl() const
{
    return m_imageUrl;
}


void OpenSearchEngine::setImageUrl(const QString &imageUrl)
{
    m_imageUrl = imageUrl;
}


QImage OpenSearchEngine::image() const
{
    return m_image;
}


void OpenSearchEngine::setImage(const QImage &image)
{
    m_image = image;
}


bool OpenSearchEngine::isValid() const
{
    return (!m_name.isEmpty() && !m_searchUrlTemplate.isEmpty());
}


bool OpenSearchEngine::operator==(const OpenSearchEngine &other) const
{
    return (m_name == other.m_name
            && m_description == other.m_description
            && m_imageUrl == other.m_imageUrl
            && m_searchUrlTemplate == other.m_searchUrlTemplate
            && m_suggestionsUrlTemplate == other.m_suggestionsUrlTemplate
            && m_searchParameters == other.m_searchParameters
            && m_suggestionsParameters == other.m_suggestionsParameters);
}


bool OpenSearchEngine::operator<(const OpenSearchEngine &other) const
{
    return (m_name < other.m_name);
}


ResponseList OpenSearchEngine::parseSuggestion(const QString &searchTerm, const QByteArray &resp)
{
    QFile file(suggestionPathFor(searchTerm));
    if (file.open(QIODevice::WriteOnly | QIODevice::Text))
    {
        file.write(resp, resp.size());
        file.close();
    }

    return parseSuggestion(resp);
}


ResponseList OpenSearchEngine::parseSuggestion(const QByteArray &resp)
{
    if (!m_parser)
        return ResponseList();

    return m_parser->parse(resp);
}


QString OpenSearchEngine::type()
{
    return m_parser->type();
}


QString OpenSearchEngine::suggestionPathFor(const QString &searchTerm)
{
    return KStandardDirs::locateLocal("cache", QString("opensearch/") + m_name + QString("/") + searchTerm, true);
}


bool OpenSearchEngine::hasCachedSuggestionsFor(const QString &searchTerm)
{
    QFileInfo info(suggestionPathFor(searchTerm));
    return info.exists() && info.lastModified().daysTo(QDateTime::currentDateTime()) < 7;
}


ResponseList OpenSearchEngine::cachedSuggestionsFor(const QString &searchTerm)
{
    QFile file(suggestionPathFor(searchTerm));
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
        return ResponseList();

    QByteArray resp;
    while (!file.atEnd())
    {
        resp += file.readLine();
    }
    return parseSuggestion(resp);
}