/*

 * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#include <AK/IDAllocator.h>

#include <LibAudio/Loader.h>

#include <LibJS/Runtime/Realm.h>

#include <LibJS/Runtime/VM.h>

#include <LibWeb/Bindings/AudioTrackPrototype.h>

#include <LibWeb/Bindings/Intrinsics.h>

#include <LibWeb/DOM/Event.h>

#include <LibWeb/HTML/AudioTrack.h>

#include <LibWeb/HTML/AudioTrackList.h>

#include <LibWeb/HTML/EventNames.h>

#include <LibWeb/HTML/HTMLMediaElement.h>

#include <LibWeb/Layout/Node.h>

#include <LibWeb/Painting/Paintable.h>

#include <LibWeb/Platform/AudioCodecPlugin.h>

namespace Web::HTML {

JS_DEFINE_ALLOCATOR(AudioTrack);

static IDAllocator s_audio_track_id_allocator;

AudioTrack::AudioTrack(JS::Realm& realm, JS::NonnullGCPtr<HTMLMediaElement> media_element, NonnullRefPtr<Audio::Loader> loader)

    : PlatformObject(realm)

    , m_media_element(media_element)

    , m_audio_plugin(Platform::AudioCodecPlugin::create(move(loader)).release_value_but_fixme_should_propagate_errors())

{

    m_audio_plugin->on_playback_position_updated = [this](auto position) {

        if (auto const* paintable = m_media_element->paintable())

            paintable->set_needs_display();

        auto playback_position = static_cast<double>(position.to_milliseconds()) / 1000.0;

        m_media_element->set_current_playback_position(playback_position);

    };

    m_audio_plugin->on_decoder_error = [this](String error_message) {

        m_media_element->set_decoder_error(move(error_message));

    };

}

AudioTrack::~AudioTrack()

{

    auto id = m_id.to_number<int>();

    VERIFY(id.has_value());

    s_audio_track_id_allocator.deallocate(id.value());

}

void AudioTrack::initialize(JS::Realm& realm)

{

    Base::initialize(realm);

    WEB_SET_PROTOTYPE_FOR_INTERFACE(AudioTrack);

    auto id = s_audio_track_id_allocator.allocate();

    m_id = String::number(id);

}

void AudioTrack::play(Badge<HTMLAudioElement>)

{

    m_audio_plugin->resume_playback();

}

void AudioTrack::pause(Badge<HTMLAudioElement>)

{

    m_audio_plugin->pause_playback();

}

AK::Duration AudioTrack::duration()

{

    return m_audio_plugin->duration();

}

void AudioTrack::seek(double position, MediaSeekMode seek_mode)

{

    // FIXME: Implement seeking mode.

    (void)seek_mode;

    m_audio_plugin->seek(position);

}

void AudioTrack::update_volume()

{

    m_audio_plugin->set_volume(m_media_element->effective_media_volume());

}

void AudioTrack::visit_edges(Cell::Visitor& visitor)

{

    Base::visit_edges(visitor);

    visitor.visit(m_media_element);

    visitor.visit(m_audio_track_list);

}

// https://html.spec.whatwg.org/multipage/media.html#dom-audiotrack-enabled

void AudioTrack::set_enabled(bool enabled)

{

    // On setting, it must enable the track if the new value is true, and disable it otherwise. (If the track is no

    // longer in an AudioTrackList object, then the track being enabled or disabled has no effect beyond changing the

    // value of the attribute on the AudioTrack object.)

    if (m_enabled == enabled)

        return;

    if (m_audio_track_list) {

        // Whenever an audio track in an AudioTrackList that was disabled is enabled, and whenever one that was enabled

        // is disabled, the user agent must queue a media element task given the media element to fire an event named

        // change at the AudioTrackList object.

        m_media_element->queue_a_media_element_task([this]() {

            m_audio_track_list->dispatch_event(DOM::Event::create(realm(), HTML::EventNames::change));

        });

    }

    m_enabled = enabled;

}

}