/*
 * Copyright (C) 2012 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``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 "modules/speech/SpeechRecognition.h"

#include "bindings/core/v8/ExceptionState.h"
#include "core/dom/Document.h"
#include "core/dom/ExceptionCode.h"
#include "core/page/Page.h"
#include "modules/mediastream/MediaStreamTrack.h"
#include "modules/speech/SpeechRecognitionController.h"
#include "modules/speech/SpeechRecognitionError.h"
#include "modules/speech/SpeechRecognitionEvent.h"

namespace blink {

SpeechRecognition* SpeechRecognition::create(ExecutionContext* context)
{
    ASSERT(context && context->isDocument());
    Document* document = toDocument(context);
    ASSERT(document);
    SpeechRecognition* speechRecognition = new SpeechRecognition(document->page(), context);
    speechRecognition->suspendIfNeeded();
    return speechRecognition;
}

void SpeechRecognition::start(ExceptionState& exceptionState)
{
    if (!m_controller)
        return;

    if (m_started) {
        exceptionState.throwDOMException(InvalidStateError, "recognition has already started.");
        return;
    }

    m_finalResults.clear();
    m_controller->start(this, m_grammars, m_lang, m_continuous, m_interimResults, m_maxAlternatives, m_audioTrack);
    m_started = true;
}

void SpeechRecognition::stopFunction()
{
    if (!m_controller)
        return;

    if (m_started && !m_stopping) {
        m_stopping = true;
        m_controller->stop(this);
    }
}

void SpeechRecognition::abort()
{
    if (!m_controller)
        return;

    if (m_started && !m_stopping) {
        m_stopping = true;
        m_controller->abort(this);
    }
}

void SpeechRecognition::didStartAudio()
{
    dispatchEvent(Event::create(EventTypeNames::audiostart));
}

void SpeechRecognition::didStartSound()
{
    dispatchEvent(Event::create(EventTypeNames::soundstart));
}

void SpeechRecognition::didStartSpeech()
{
    dispatchEvent(Event::create(EventTypeNames::speechstart));
}

void SpeechRecognition::didEndSpeech()
{
    dispatchEvent(Event::create(EventTypeNames::speechend));
}

void SpeechRecognition::didEndSound()
{
    dispatchEvent(Event::create(EventTypeNames::soundend));
}

void SpeechRecognition::didEndAudio()
{
    dispatchEvent(Event::create(EventTypeNames::audioend));
}

void SpeechRecognition::didReceiveResults(const HeapVector<Member<SpeechRecognitionResult>>& newFinalResults, const HeapVector<Member<SpeechRecognitionResult>>& currentInterimResults)
{
    size_t resultIndex = m_finalResults.size();

    for (size_t i = 0; i < newFinalResults.size(); ++i)
        m_finalResults.append(newFinalResults[i]);

    HeapVector<Member<SpeechRecognitionResult>> results = m_finalResults;
    for (size_t i = 0; i < currentInterimResults.size(); ++i)
        results.append(currentInterimResults[i]);

    dispatchEvent(SpeechRecognitionEvent::createResult(resultIndex, results));
}

void SpeechRecognition::didReceiveNoMatch(SpeechRecognitionResult* result)
{
    dispatchEvent(SpeechRecognitionEvent::createNoMatch(result));
}

void SpeechRecognition::didReceiveError(PassRefPtrWillBeRawPtr<SpeechRecognitionError> error)
{
    dispatchEvent(error);
    m_started = false;
}

void SpeechRecognition::didStart()
{
    dispatchEvent(Event::create(EventTypeNames::start));
}

void SpeechRecognition::didEnd()
{
    m_started = false;
    m_stopping = false;
    if (!m_stoppedByActiveDOMObject)
        dispatchEvent(Event::create(EventTypeNames::end));
}

const AtomicString& SpeechRecognition::interfaceName() const
{
    return EventTargetNames::SpeechRecognition;
}

ExecutionContext* SpeechRecognition::executionContext() const
{
    return ActiveDOMObject::executionContext();
}

void SpeechRecognition::stop()
{
    m_stoppedByActiveDOMObject = true;
    if (hasPendingActivity())
        abort();
}

bool SpeechRecognition::hasPendingActivity() const
{
    return m_started;
}

SpeechRecognition::SpeechRecognition(Page* page, ExecutionContext* context)
    : PageLifecycleObserver(page)
    , ActiveDOMObject(context)
    , m_grammars(SpeechGrammarList::create()) // FIXME: The spec is not clear on the default value for the grammars attribute.
    , m_audioTrack(nullptr)
    , m_continuous(false)
    , m_interimResults(false)
    , m_maxAlternatives(1)
    , m_controller(SpeechRecognitionController::from(page))
    , m_stoppedByActiveDOMObject(false)
    , m_started(false)
    , m_stopping(false)
{
    // FIXME: Need to hook up with Page to get notified when the visibility changes.
}

SpeechRecognition::~SpeechRecognition()
{
}

void SpeechRecognition::contextDestroyed()
{
    m_controller = nullptr;
    PageLifecycleObserver::contextDestroyed();
}

DEFINE_TRACE(SpeechRecognition)
{
    visitor->trace(m_grammars);
    visitor->trace(m_audioTrack);
    visitor->trace(m_controller);
    visitor->trace(m_finalResults);
    RefCountedGarbageCollectedEventTargetWithInlineData<SpeechRecognition>::trace(visitor);
    PageLifecycleObserver::trace(visitor);
    ActiveDOMObject::trace(visitor);
}

} // namespace blink