/**
 * Copyright (C) 2015 MongoDB Inc.
 *
 * This program is free software: you can redistribute it and/or  modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * As a special exception, the copyright holders give permission to link the
 * code of portions of this program with the OpenSSL library under certain
 * conditions as described in each individual source file and distribute
 * linked combinations including the program with the OpenSSL library. You
 * must comply with the GNU Affero General Public License in all respects
 * for all of the code used other than as permitted herein. If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so. If you do not
 * wish to do so, delete this exception statement from your version. If you
 * delete this exception statement from all source files in the program,
 * then also delete it in the license file.
 */

#include "mongo/platform/basic.h"

#include "mongo/scripting/mozjs/maxkey.h"

#include "mongo/scripting/mozjs/implscope.h"
#include "mongo/scripting/mozjs/internedstring.h"
#include "mongo/scripting/mozjs/objectwrapper.h"
#include "mongo/scripting/mozjs/valuereader.h"
#include "mongo/scripting/mozjs/wrapconstrainedmethod.h"

namespace mongo {
namespace mozjs {

const JSFunctionSpec MaxKeyInfo::methods[3] = {
    MONGO_ATTACH_JS_CONSTRAINED_METHOD(tojson, MaxKeyInfo),
    MONGO_ATTACH_JS_CONSTRAINED_METHOD(toJSON, MaxKeyInfo),
    JS_FS_END,
};

const char* const MaxKeyInfo::className = "MaxKey";

void MaxKeyInfo::construct(JSContext* cx, JS::CallArgs args) {
    call(cx, args);
}

/**
 * The idea here is that MinKey and MaxKey are singleton callable objects that
 * return the singleton when called. This enables all instances to compare
 * == and === to MinKey even if created by "new MinKey()" in JS.
 */
void MaxKeyInfo::call(JSContext* cx, JS::CallArgs args) {
    auto scope = getScope(cx);

    ObjectWrapper o(cx, scope->getProto<MaxKeyInfo>().getProto());

    JS::RootedValue val(cx);

    if (!o.hasField(InternedString::singleton)) {
        JS::RootedObject thisv(cx);
        scope->getProto<MaxKeyInfo>().newObject(&thisv);

        val.setObjectOrNull(thisv);
        o.setValue(InternedString::singleton, val);
    } else {
        o.getValue(InternedString::singleton, &val);

        if (!getScope(cx)->getProto<MaxKeyInfo>().instanceOf(val))
            uasserted(ErrorCodes::BadValue, "MaxKey singleton not of type MaxKey");
    }

    args.rval().set(val);
}

void MaxKeyInfo::hasInstance(JSContext* cx,
                             JS::HandleObject obj,
                             JS::MutableHandleValue vp,
                             bool* bp) {
    *bp = getScope(cx)->getProto<MaxKeyInfo>().instanceOf(vp);
}

void MaxKeyInfo::Functions::tojson::call(JSContext* cx, JS::CallArgs args) {
    ValueReader(cx, args.rval()).fromStringData("{ \"$maxKey\" : 1 }");
}

void MaxKeyInfo::Functions::toJSON::call(JSContext* cx, JS::CallArgs args) {
    ValueReader(cx, args.rval()).fromBSON(BSON("$maxKey" << 1), nullptr, false);
}

void MaxKeyInfo::postInstall(JSContext* cx, JS::HandleObject global, JS::HandleObject proto) {
    ObjectWrapper protoWrapper(cx, proto);

    JS::RootedValue value(cx);
    getScope(cx)->getProto<MaxKeyInfo>().newObject(&value);

    ObjectWrapper(cx, global).setValue(InternedString::MaxKey, value);
    protoWrapper.setValue(InternedString::singleton, value);
}

}  // namespace mozjs
}  // namespace mongo
