#include <iostream>
#include "classicactions.h"
#include "classictimeline.h"
#include "classicnote.h"

ClassicTimeline::ClassicTimeline()
{
    // BPM of METEOR is 170.
    // Length is 1:14
    // I calculated that the time between beats is about 1412162 microseconds

    std::string song_filename = "/home/naiji/METEOR.flac";

    _music.openFromFile(song_filename);
    _music.play();
    _music.setVolume(30);

    _timeline.reserve(1000);

    microsec starting_beat_offset = 372162;
    int amount_of_beats = 209;
    microsec interval = 1412162;
    microsec note_input_offset = 412162;
    microsec bpm_iterator = starting_beat_offset;
    microsec bpm_end = starting_beat_offset + (interval * amount_of_beats);
    _visibility_offset = note_input_offset * 12;

    _timeline.emplace_back(new ClassicNote({note_input_offset}, bpm_iterator, Action::PRESS_DOWN));
    bpm_iterator += interval;

    _timeline.emplace_back(new ClassicNote({note_input_offset}, bpm_iterator, Action::PRESS_LEFT));
    bpm_iterator += interval;

    _timeline.emplace_back(new ClassicNote({note_input_offset}, bpm_iterator, Action::PRESS_LEFT));
    bpm_iterator += interval;

    while (bpm_iterator < bpm_end)
    {
        _timeline.emplace_back(new ClassicNote({note_input_offset}, bpm_iterator, Action::PRESS_UP));
        bpm_iterator += interval;
    }

    expire(_active_note);
    _top_note = _timeline.begin();
    _last_visible_note = _top_note;
}

ClassicTimeline::~ClassicTimeline()
{
    clear();
}

void ClassicTimeline::clear()
{
    for (auto note : _timeline)
        delete note;

    _timeline.clear();
    expire(_top_note);
    expire(_last_visible_note);
    expire(_active_note);
}

void ClassicTimeline::update()
{
    const auto& offset = currentMusicOffset();
    std::cout << "Upadting at: " << offset << '\n';
    checkCurrentActiveNote(offset);
    checkForNextActiveNote(offset);
}

void ClassicTimeline::checkCurrentActiveNote(const microsec &music_offset)
{
    if (!isExpired(_active_note) && !(*_active_note)->isActive(music_offset))
    {
        expire(_active_note);
        ++_top_note;
    }
}

void ClassicTimeline::checkForNextActiveNote(const microsec &music_offset)
{
    if (isExpired(_active_note) && (*_top_note)->isActive(music_offset))
    {
        std::cout << "New active note: " << music_offset << '\n';
        _active_note = _top_note;
    }
}

ClassicTimeline::Iterator ClassicTimeline::getActiveNote() noexcept
{
    update();
    return _active_note;
}

bool ClassicTimeline::isExpired(const Iterator &iterator)
{
    return iterator == _timeline.end();
}

void ClassicTimeline::expire(Iterator &iterator)
{
    iterator = _timeline.end();
}

microsec ClassicTimeline::currentMusicOffset() const
{
    return _music.getPlayingOffset().asMicroseconds();
}

void ClassicTimeline::fetchVisibleNotes(const std::unique_ptr<ClassicViewManager>& view_manager)
{
    Iterator note_iterator = _top_note;
    auto music_offset = currentMusicOffset();

    while (((*note_iterator)->offset() - _visibility_offset) <= music_offset)
    {
        ++note_iterator;
        if (note_iterator > _last_visible_note)
            (void) view_manager;//_view_manager->initNoteGraphics((*note_iterator));
    }

    _last_visible_note = note_iterator;
}