/*
  This file is part of the PhantomJS project from Ofi Labs.

  Copyright (C) 2011 Ariya Hidayat <ariya.hidayat@gmail.com>
  Copyright (C) 2011 Ivan De Marino <ivan.de.marino@gmail.com>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the <organization> nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "utils.h"
#include "consts.h"
#include "terminal.h"

#include <QFile>
#include <QDebug>
#include <QDateTime>
#include <QDir>
#include <QtWebKitWidgets/QWebFrame>

static QString findScript(const QString& jsFilePath, const QString& libraryPath)
{
    if (!jsFilePath.isEmpty()) {
        QFile jsFile;

        // Is file in the PWD?
        jsFile.setFileName(QDir::fromNativeSeparators(jsFilePath)); //< Normalise User-provided path
        if (!jsFile.exists()) {
            // File is not in the PWD. Is it in the lookup directory?
            jsFile.setFileName(libraryPath + '/' + QDir::fromNativeSeparators(jsFilePath));
        }

        return jsFile.fileName();
    }
    return QString();
}

static QString jsFromScriptFile(const QString& scriptPath, const QString& scriptLanguage, const Encoding& enc)
{
    QFile jsFile(scriptPath);
    if (jsFile.exists() && jsFile.open(QFile::ReadOnly)) {
        QString scriptBody = enc.decode(jsFile.readAll());
        jsFile.close();

        // Remove CLI script heading
        if (scriptBody.startsWith("#!")) {
            int len = scriptBody.indexOf(QRegExp("[\r\n]"));
            if (len == -1) { len = scriptBody.length(); }
            scriptBody.remove(0, len);
        }

        // If a language is specified and is not "javascript", reject it.
        if (scriptLanguage != "javascript" && !scriptLanguage.isNull()) {
            QString errMessage = QString("Unsupported language: %1").arg(scriptLanguage);
            Terminal::instance()->cerr(errMessage);
            qWarning("%s", qPrintable(errMessage));
            return QString();
        }

        return scriptBody;
    } else {
        return QString();
    }
}

namespace Utils
{

bool printDebugMessages = false;

void messageHandler(QtMsgType type, const QMessageLogContext& context, const QString& msg)
{
    Q_UNUSED(context);
    QDateTime now = QDateTime::currentDateTime();

    switch (type) {
    case QtDebugMsg:
        if (printDebugMessages) {
            fprintf(stderr, "%s [DEBUG] %s\n", qPrintable(now.toString(Qt::ISODate)), qPrintable(msg));
        }
        break;
    case QtWarningMsg:
        if (printDebugMessages) {
            fprintf(stderr, "%s [WARNING] %s\n", qPrintable(now.toString(Qt::ISODate)), qPrintable(msg));
        }
        break;
    case QtCriticalMsg:
        fprintf(stderr, "%s [CRITICAL] %s\n", qPrintable(now.toString(Qt::ISODate)), qPrintable(msg));
        break;
    case QtFatalMsg:
        fprintf(stderr, "%s [FATAL] %s\n", qPrintable(now.toString(Qt::ISODate)), qPrintable(msg));
        abort();
    }
}

bool injectJsInFrame(const QString& jsFilePath, const QString& libraryPath, QWebFrame* targetFrame, const bool startingScript)
{
    return injectJsInFrame(jsFilePath, QString(), Encoding::UTF8, libraryPath, targetFrame, startingScript);
}

bool injectJsInFrame(const QString& jsFilePath, const QString& jsFileLanguage, const Encoding& jsFileEnc, const QString& libraryPath, QWebFrame* targetFrame, const bool startingScript)
{
    // Don't do anything if an empty string is passed
    QString scriptPath = findScript(jsFilePath, libraryPath);
    QString scriptBody = jsFromScriptFile(scriptPath, jsFileLanguage, jsFileEnc);
    if (scriptBody.isEmpty()) {
        if (startingScript) {
            Terminal::instance()->cerr(QString("Can't open '%1'").arg(jsFilePath));
        } else {
            qWarning("Can't open '%s'", qPrintable(jsFilePath));
        }
        return false;
    }
    // Execute JS code in the context of the document
    targetFrame->evaluateJavaScript(scriptBody, QString(JAVASCRIPT_SOURCE_CODE_URL).arg(QFileInfo(scriptPath).fileName()));
    return true;
}

bool loadJSForDebug(const QString& jsFilePath, const QString& libraryPath, QWebFrame* targetFrame, const bool autorun)
{
    return loadJSForDebug(jsFilePath, QString(), Encoding::UTF8, libraryPath, targetFrame, autorun);
}

bool loadJSForDebug(const QString& jsFilePath, const QString& jsFileLanguage, const Encoding& jsFileEnc, const QString& libraryPath, QWebFrame* targetFrame, const bool autorun)
{
    QString scriptPath = findScript(jsFilePath, libraryPath);
    QString scriptBody = jsFromScriptFile(scriptPath, jsFileLanguage, jsFileEnc);

    scriptBody = QString("function __run() {\n%1\n}").arg(scriptBody);
    targetFrame->evaluateJavaScript(scriptBody, QString(JAVASCRIPT_SOURCE_CODE_URL).arg(QFileInfo(scriptPath).fileName()));

    if (autorun) {
        targetFrame->evaluateJavaScript("__run()", QString());
    }

    return true;
}

QString readResourceFileUtf8(const QString& resourceFilePath)
{
    QFile f(resourceFilePath);
    f.open(QFile::ReadOnly); //< It's OK to assume this succeed. If it doesn't, we have a bigger problem.
    return QString::fromUtf8(f.readAll());
}

}; // namespace Utils