/*
 * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/VM.h>
#include <LibWeb/Bindings/AudioTrackListPrototype.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/HTML/AudioTrackList.h>
#include <LibWeb/HTML/EventNames.h>

namespace Web::HTML {

AudioTrackList::AudioTrackList(JS::Realm& realm)
    : DOM::EventTarget(realm)
    , m_audio_tracks(realm.heap())
{
}

JS::ThrowCompletionOr<void> AudioTrackList::initialize(JS::Realm& realm)
{
    MUST_OR_THROW_OOM(Base::initialize(realm));
    set_prototype(&Bindings::ensure_web_prototype<Bindings::AudioTrackListPrototype>(realm, "AudioTrackList"));

    return {};
}

// https://html.spec.whatwg.org/multipage/media.html#dom-tracklist-item
JS::ThrowCompletionOr<Optional<JS::PropertyDescriptor>> AudioTrackList::internal_get_own_property(JS::PropertyKey const& property_name) const
{
    // To determine the value of an indexed property for a given index index in an AudioTrackList or VideoTrackList
    // object list, the user agent must return the AudioTrack or VideoTrack object that represents the indexth track
    // in list.
    if (property_name.is_number()) {
        if (auto index = property_name.as_number(); index < m_audio_tracks.size()) {
            JS::PropertyDescriptor descriptor;
            descriptor.value = m_audio_tracks.at(index);

            return descriptor;
        }
    }

    return Base::internal_get_own_property(property_name);
}

ErrorOr<void> AudioTrackList::add_track(Badge<HTMLMediaElement>, JS::NonnullGCPtr<AudioTrack> audio_track)
{
    TRY(m_audio_tracks.try_append(audio_track));
    audio_track->set_audio_track_list({}, this);

    return {};
}

void AudioTrackList::remove_all_tracks(Badge<HTMLMediaElement>)
{
    m_audio_tracks.clear();
}

// https://html.spec.whatwg.org/multipage/media.html#dom-audiotracklist-gettrackbyid
JS::GCPtr<AudioTrack> AudioTrackList::get_track_by_id(StringView id) const
{
    // The AudioTrackList getTrackById(id) and VideoTrackList getTrackById(id) methods must return the first AudioTrack
    // or VideoTrack object (respectively) in the AudioTrackList or VideoTrackList object (respectively) whose identifier
    // is equal to the value of the id argument (in the natural order of the list, as defined above).
    auto it = m_audio_tracks.find_if([&](auto const& audio_track) {
        return audio_track->id() == id;
    });

    // When no tracks match the given argument, the methods must return null.
    if (it == m_audio_tracks.end())
        return nullptr;

    return *it;
}

bool AudioTrackList::has_enabled_track() const
{
    auto it = m_audio_tracks.find_if([&](auto const& audio_track) {
        return audio_track->enabled();
    });

    return it != m_audio_tracks.end();
}

// https://html.spec.whatwg.org/multipage/media.html#handler-tracklist-onchange
void AudioTrackList::set_onchange(WebIDL::CallbackType* event_handler)
{
    set_event_handler_attribute(HTML::EventNames::change, event_handler);
}

// https://html.spec.whatwg.org/multipage/media.html#handler-tracklist-onchange
WebIDL::CallbackType* AudioTrackList::onchange()
{
    return event_handler_attribute(HTML::EventNames::change);
}

// https://html.spec.whatwg.org/multipage/media.html#handler-tracklist-onaddtrack
void AudioTrackList::set_onaddtrack(WebIDL::CallbackType* event_handler)
{
    set_event_handler_attribute(HTML::EventNames::addtrack, event_handler);
}

// https://html.spec.whatwg.org/multipage/media.html#handler-tracklist-onaddtrack
WebIDL::CallbackType* AudioTrackList::onaddtrack()
{
    return event_handler_attribute(HTML::EventNames::addtrack);
}

// https://html.spec.whatwg.org/multipage/media.html#handler-tracklist-onremovetrack
void AudioTrackList::set_onremovetrack(WebIDL::CallbackType* event_handler)
{
    set_event_handler_attribute(HTML::EventNames::removetrack, event_handler);
}

// https://html.spec.whatwg.org/multipage/media.html#handler-tracklist-onremovetrack
WebIDL::CallbackType* AudioTrackList::onremovetrack()
{
    return event_handler_attribute(HTML::EventNames::removetrack);
}

}