/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Copyright (C) 2014 Petroules Corporation.
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Build Suite.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://www.qt.io/licensing.  For further information
** use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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****************************************************************************/

#include "propertylist.h"

#include <tools/hostosinfo.h>

#include <QFile>
#include <QScriptEngine>
#include <QScriptValue>
#include <QTextStream>

#import <Foundation/Foundation.h>

// If this conflicts someday, just change it :)
enum {
    NSPropertyListJSONFormat = 1000
};

namespace qbs {
namespace Internal {

static inline QString fromNSString(const NSString *string)
{
    if (!string)
        return QString();
   QString qstring;
   qstring.resize([string length]);
   [string getCharacters:reinterpret_cast<unichar*>(qstring.data())
                   range:NSMakeRange(0, [string length])];
   return qstring;
}

static inline NSString *toNSString(const QString &qstring)
{
    return [NSString stringWithCharacters:reinterpret_cast<const UniChar*>(qstring.unicode())
                                   length:qstring.length()];
}

class PropertyListPrivate
{
public:
    PropertyListPrivate();

    id propertyListObject;
    int propertyListFormat;

    void readFromData(QScriptContext *context, NSData *data);
    NSData *writeToData(QScriptContext *context, const QString &format);
};

void initializeJsExtensionPropertyList(QScriptValue extensionObject)
{
    QScriptEngine *engine = extensionObject.engine();
    QScriptValue obj = engine->newQMetaObject(&PropertyList::staticMetaObject,
                                              engine->newFunction(&PropertyList::ctor));
    extensionObject.setProperty(QLatin1String("PropertyList"), obj);
}

QScriptValue PropertyList::ctor(QScriptContext *context, QScriptEngine *engine)
{
    PropertyList *p = new PropertyList(context);
    QScriptValue obj = engine->newQObject(p, QScriptEngine::ScriptOwnership);
    return obj;
}

PropertyListPrivate::PropertyListPrivate()
    : propertyListObject(), propertyListFormat(0)
{
}

PropertyList::~PropertyList()
{
    [d->propertyListObject release];
    delete d;
}

PropertyList::PropertyList(QScriptContext *context)
: d(new PropertyListPrivate)
{
    Q_UNUSED(context);
    Q_ASSERT(thisObject().engine() == engine());
}

bool PropertyList::isEmpty() const
{
    Q_ASSERT(thisObject().engine() == engine());
    PropertyList *p = qscriptvalue_cast<PropertyList*>(thisObject());
    return !p->d->propertyListObject;
}

void PropertyList::clear()
{
    Q_ASSERT(thisObject().engine() == engine());
    PropertyList *p = qscriptvalue_cast<PropertyList*>(thisObject());
    [p->d->propertyListObject release];
    p->d->propertyListObject = nil;
    p->d->propertyListFormat = 0;
}

void PropertyList::readFromString(const QString &input)
{
    Q_ASSERT(thisObject().engine() == engine());
    PropertyList *p = qscriptvalue_cast<PropertyList*>(thisObject());

    NSString *inputString = toNSString(input);
    NSData *data = [NSData dataWithBytes:[inputString UTF8String]
                            length:[inputString lengthOfBytesUsingEncoding:NSUTF8StringEncoding]];
    p->d->readFromData(p->context(), data);
}

void PropertyList::readFromFile(const QString &filePath)
{
    Q_ASSERT(thisObject().engine() == engine());
    PropertyList *p = qscriptvalue_cast<PropertyList*>(thisObject());

    NSError *error = nil;
    NSData *data = [NSData dataWithContentsOfFile:toNSString(filePath) options:0 error:&error];
    if (data) {
        p->d->readFromData(p->context(), data);
    } else {
        p->context()->throwError(fromNSString([error localizedDescription]));
    }
}

NSData *PropertyListPrivate::writeToData(QScriptContext *context, const QString &format)
{
    NSError *error = nil;
    NSString *errorString = nil;
    NSData *data = nil;
    if (format == QLatin1String("json") || format == QLatin1String("json-pretty") ||
        format == QLatin1String("json-compact")) {
#if __MAC_OS_X_VERSION_MAX_ALLOWED >= __MAC_10_7
        if (NSClassFromString(@"NSJSONSerialization")) {
            if ([NSJSONSerialization isValidJSONObject:propertyListObject]) {
                error = nil;
                errorString = nil;
                const NSJSONWritingOptions options = format == QLatin1String("json-pretty")
                        ? NSJSONWritingPrettyPrinted : 0;
                data = [NSJSONSerialization dataWithJSONObject:propertyListObject
                                                       options:options
                                                         error:&error];
                if (Q_UNLIKELY(!data)) {
                    errorString = [error localizedDescription];
                }
            } else {
                errorString = @"Property list object cannot be converted to JSON data";
            }
        }
#endif
        else {
            errorString = @"JSON serialization of property lists is not "
                          @"supported on this version of OS X";
        }
    } else if (format == QLatin1String("xml1") || format == QLatin1String("binary1")) {
        const NSPropertyListFormat plistFormat = format == QLatin1String("xml1")
                                                      ? NSPropertyListXMLFormat_v1_0
                                                      : NSPropertyListBinaryFormat_v1_0;

        error = nil;
        errorString = nil;
        if ([NSPropertyListSerialization
                respondsToSelector:@selector(dataWithPropertyList:format:options:error:)]) {
            data = [NSPropertyListSerialization dataWithPropertyList:propertyListObject
                                                              format:plistFormat
                                                             options:0
                                                               error:&error];
            if (Q_UNLIKELY(!data)) {
                errorString = [error localizedDescription];
            }
        } else {
            data = [NSPropertyListSerialization dataFromPropertyList:propertyListObject
                                                              format:plistFormat
                                                    errorDescription:&errorString];
        }
    } else {
        errorString = [NSString stringWithFormat:@"Property lists cannot be written in the '%s' "
                                                 @"format", format.toUtf8().constData()];
    }

    if (Q_UNLIKELY(!data)) {
        context->throwError(fromNSString(errorString));
    }

    return data;
}

void PropertyList::writeToFile(const QString &filePath, const QString &plistFormat)
{
    Q_ASSERT(thisObject().engine() == engine());
    PropertyList *p = qscriptvalue_cast<PropertyList*>(thisObject());

    NSError *error = nil;
    NSData *data = p->d->writeToData(p->context(), plistFormat);
    if (Q_LIKELY(data)) {
        if (Q_UNLIKELY(![data writeToFile:toNSString(filePath) options:NSDataWritingAtomic
                                     error:&error])) {
            p->context()->throwError(fromNSString([error localizedDescription]));
        }
    }
}

void PropertyListPrivate::readFromData(QScriptContext *context, NSData *data)
{
    NSPropertyListFormat format;
    int internalFormat = 0;
    NSError *error = nil;
    NSString *errorString = nil;
    id plist = nil;

    if ([NSPropertyListSerialization
            respondsToSelector:@selector(propertyListWithData:options:format:error:)]) {
        error = nil;
        errorString = nil;
        plist = [NSPropertyListSerialization propertyListWithData:data
                                                          options:0
                                                           format:&format error:&error];
        if (Q_UNLIKELY(!plist)) {
            errorString = [error localizedDescription];
        }
    }
    else
    {
        error = nil;
        errorString = nil;
        plist = [NSPropertyListSerialization propertyListFromData:data
                                                 mutabilityOption:NSPropertyListImmutable
                                                           format:&format
                                                 errorDescription:&errorString];
    }
    if (plist)
        internalFormat = format;
#if __MAC_OS_X_VERSION_MAX_ALLOWED >= __MAC_10_7
    if (!plist && NSClassFromString(@"NSJSONSerialization")) {
        error = nil;
        errorString = nil;
        plist = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
        if (Q_UNLIKELY(!plist)) {
            errorString = [error localizedDescription];
        } else {
            internalFormat = NSPropertyListJSONFormat;
        }
    }
#endif

    if (Q_UNLIKELY(!plist)) {
        context->throwError(fromNSString(errorString));
    } else {
        [propertyListObject release];
        propertyListObject = [plist retain];
        propertyListFormat = internalFormat;
    }
}

QScriptValue PropertyList::format() const
{
    Q_ASSERT(thisObject().engine() == engine());
    PropertyList *p = qscriptvalue_cast<PropertyList*>(thisObject());
    switch (p->d->propertyListFormat)
    {
    case NSPropertyListOpenStepFormat:
        return QLatin1String("openstep");
    case NSPropertyListXMLFormat_v1_0:
        return QLatin1String("xml1");
    case NSPropertyListBinaryFormat_v1_0:
        return QLatin1String("binary1");
    case NSPropertyListJSONFormat:
        return QLatin1String("json");
    default:
        return p->engine()->undefinedValue();
    }
}

QString PropertyList::toString(const QString &plistFormat) const
{
    Q_ASSERT(thisObject().engine() == engine());
    PropertyList *p = qscriptvalue_cast<PropertyList*>(thisObject());

    if (plistFormat == QLatin1String("binary1")) {
        p->context()->throwError(QLatin1String("Property list object cannot be converted to a "
                                               "string in the binary1 format; this format can only "
                                               "be written directly to a file"));
        return QString();
    }

    if (p->d->propertyListObject)
    {
        NSData *data = p->d->writeToData(p->context(), plistFormat);
        if (data)
            return fromNSString([[[NSString alloc] initWithData:data
                                                       encoding:NSUTF8StringEncoding] autorelease]);
    }

    return QString();
}

QString PropertyList::toXMLString() const
{
    return toString(QLatin1String("xml1"));
}

QString PropertyList::toJSONString(const QString &style) const
{
    QString format = QLatin1String("json");
    if (!style.isEmpty())
        format += QLatin1String("-") + style;

    return toString(format);
}

} // namespace Internal
} // namespace qbs
