#pragma once

#include <vector>
#include "timeline.h"

class Note;

class ClassicTimeline : public Timeline
{
public:
    explicit ClassicTimeline();
    virtual void update(const microsec& music_offset) override;
    virtual void init() override;
    virtual void clear() override;

    Note *getActiveNote(const microsec &music_offset) noexcept;

private:
    std::vector<Note*> _timeline;
    std::vector<Note*>::const_iterator _top_note;
    Note* _active_note;

    std::vector<Note*>::const_iterator _last_visible_note;
    microsec _visibility_offset;

    void checkCurrentActiveNote(const microsec &music_offset);
    void checkForNextActiveNote(const microsec &music_offset);
    void prepareNotesToDraw(const microsec &music_offset);

    /* Difference between top and active note is that
     * top note is the note handling input right now
     * OR it's the closest note from current music offset
     * position, not necessarily active. A note stops being top only
     * after dying or being tapped by player, even if it's already
     * past her perfect offset.
     *
     * Meanwhile active note is the note which is currently handling
     *     player input for grade.
     *
     * An active note is always top note but a top note
     *    is not always active note.
     *                                         */
};