/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 *
 * 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 Google Inc. 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 THE COPYRIGHT
 * OWNER OR CONTRIBUTORS 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 "config.h"

#include "Geolocation.h"
#include "V8Binding.h"
#include "V8CustomBinding.h"
#include "V8CustomPositionCallback.h"
#include "V8CustomPositionErrorCallback.h"
#include "V8Proxy.h"


using namespace std;
using namespace WTF;

namespace WebCore {

static const char* typeMismatchError = "TYPE_MISMATCH_ERR: DOM Exception 17";

static void throwTypeMismatchException()
{
    V8Proxy::throwError(V8Proxy::GeneralError, typeMismatchError);
}

static PassRefPtr<PositionCallback> createPositionCallback(v8::Local<v8::Value> value, bool& succeeded)
{
    succeeded = true;

    // The spec specifies 'FunctionOnly' for this object.
    if (!value->IsFunction()) {
        succeeded = false;
        throwTypeMismatchException();
        return 0;
    }

    Frame* frame = V8Proxy::retrieveFrameForCurrentContext();
    return V8CustomPositionCallback::create(value, frame);
}

static PassRefPtr<PositionErrorCallback> createPositionErrorCallback(v8::Local<v8::Value> value, bool& succeeded)
{
    succeeded = true;

    // Argument is optional (hence undefined is allowed), and null is allowed.
    if (isUndefinedOrNull(value))
        return 0;

    // The spec specifies 'FunctionOnly' for this object.
    if (!value->IsFunction()) {
        succeeded = false;
        throwTypeMismatchException();
        return 0;
    }

    Frame* frame = V8Proxy::retrieveFrameForCurrentContext();
    return V8CustomPositionErrorCallback::create(value, frame);
}

static PassRefPtr<PositionOptions> createPositionOptions(v8::Local<v8::Value> value, bool& succeeded)
{
    succeeded = true;

    // Create default options.
    RefPtr<PositionOptions> options = PositionOptions::create();

    // Argument is optional (hence undefined is allowed), and null is allowed.
    if (isUndefinedOrNull(value)) {
        // Use default options.
        return options.release();
    }

    // Given the above test, this will always yield an object.
    v8::Local<v8::Object> object = value->ToObject();

    // For all three properties, we apply the following ...
    // - If the getter or the property's valueOf method throws an exception, we
    //   quit so as not to risk overwriting the exception.
    // - If the value is absent or undefined, we don't override the default.
    v8::Local<v8::Value> enableHighAccuracyValue = object->Get(v8::String::New("enableHighAccuracy"));
    if (enableHighAccuracyValue.IsEmpty()) {
        succeeded = false;
        return 0;
    }
    if (!enableHighAccuracyValue->IsUndefined()) {
        v8::Local<v8::Boolean> enableHighAccuracyBoolean = enableHighAccuracyValue->ToBoolean();
        if (enableHighAccuracyBoolean.IsEmpty()) {
            succeeded = false;
            return 0;
        }
        options->setEnableHighAccuracy(enableHighAccuracyBoolean->Value());
    }

    v8::Local<v8::Value> timeoutValue = object->Get(v8::String::New("timeout"));
    if (timeoutValue.IsEmpty()) {
        succeeded = false;
        return 0;
    }
    if (!timeoutValue->IsUndefined()) {
        v8::Local<v8::Number> timeoutNumber = timeoutValue->ToNumber();
        if (timeoutNumber.IsEmpty()) {
            succeeded = false;
            return 0;
        }
        double timeoutDouble = timeoutNumber->Value();
        // V8 does not export a public symbol for infinity, so we must use a
        // platform type. On Android, it seems that V8 uses 0xf70f000000000000,
        // which is the standard way to represent infinity in a double. However,
        // numeric_limits<double>::infinity uses the system HUGE_VAL, which is
        // different. Therefore we test using isinf() and check that the value
        // is positive, which seems to handle things correctly.
        // If the value is infinity, there's nothing to do.
        if (!(isinf(timeoutDouble) && timeoutDouble > 0)) {
            v8::Local<v8::Int32> timeoutInt32 = timeoutValue->ToInt32();
            if (timeoutInt32.IsEmpty()) {
                succeeded = false;
                return 0;
            }
            // Wrap to int32 and force non-negative to match behavior of window.setTimeout.
            options->setTimeout(max(0, timeoutInt32->Value()));
        }
    }

    v8::Local<v8::Value> maximumAgeValue = object->Get(v8::String::New("maximumAge"));
    if (maximumAgeValue.IsEmpty()) {
        succeeded = false;
        return 0;
    }
    if (!maximumAgeValue->IsUndefined()) {
        v8::Local<v8::Number> maximumAgeNumber = maximumAgeValue->ToNumber();
        if (maximumAgeNumber.IsEmpty()) {
            succeeded = false;
            return 0;
        }
        double maximumAgeDouble = maximumAgeNumber->Value();
        if (isinf(maximumAgeDouble) && maximumAgeDouble > 0) {
            // If the value is infinity, clear maximumAge.
            options->clearMaximumAge();
        } else {
            v8::Local<v8::Int32> maximumAgeInt32 = maximumAgeValue->ToInt32();
            if (maximumAgeInt32.IsEmpty()) {
                succeeded = false;
                return 0;
            }
            // Wrap to int32 and force non-negative to match behavior of window.setTimeout.
            options->setMaximumAge(max(0, maximumAgeInt32->Value()));
        }
    }

    return options.release();
}

CALLBACK_FUNC_DECL(GeolocationGetCurrentPosition)
{
    INC_STATS("DOM.Geolocation.getCurrentPosition()");

    bool succeeded = false;

    RefPtr<PositionCallback> positionCallback = createPositionCallback(args[0], succeeded);
    if (!succeeded)
        return v8::Undefined();
    ASSERT(positionCallback);

    RefPtr<PositionErrorCallback> positionErrorCallback = createPositionErrorCallback(args[1], succeeded);
    if (!succeeded)
        return v8::Undefined();

    RefPtr<PositionOptions> positionOptions = createPositionOptions(args[2], succeeded);
    if (!succeeded)
        return v8::Undefined();
    ASSERT(positionOptions);

    Geolocation* geolocation = V8DOMWrapper::convertToNativeObject<Geolocation>(V8ClassIndex::GEOLOCATION, args.Holder());
    geolocation->getCurrentPosition(positionCallback.release(), positionErrorCallback.release(), positionOptions.release());
    return v8::Undefined();
}

CALLBACK_FUNC_DECL(GeolocationWatchPosition)
{
    INC_STATS("DOM.Geolocation.watchPosition()");

    bool succeeded = false;

    RefPtr<PositionCallback> positionCallback = createPositionCallback(args[0], succeeded);
    if (!succeeded)
        return v8::Undefined();
    ASSERT(positionCallback);

    RefPtr<PositionErrorCallback> positionErrorCallback = createPositionErrorCallback(args[1], succeeded);
    if (!succeeded)
        return v8::Undefined();

    RefPtr<PositionOptions> positionOptions = createPositionOptions(args[2], succeeded);
    if (!succeeded)
        return v8::Undefined();
    ASSERT(positionOptions);

    Geolocation* geolocation = V8DOMWrapper::convertToNativeObject<Geolocation>(V8ClassIndex::GEOLOCATION, args.Holder());
    int watchId = geolocation->watchPosition(positionCallback.release(), positionErrorCallback.release(), positionOptions.release());
    return v8::Number::New(watchId);
}

} // namespace WebCore