From 5e3ddccac07b5d420cc74eee623ded477ab657f2 Mon Sep 17 00:00:00 2001
From: NaiJi <naijiworld@protonmail.com>
Date: Fri, 3 Dec 2021 22:21:27 +0300
Subject: [PATCH] Refactor music position, implement flow for Editor, link
 everything together

---
 core/shared/core/editor.h                     |  3 +-
 core/shared/core/game.h                       |  3 +-
 core/shared/core/timeline.h                   | 19 +++---
 core/shared/core/updatedata.h                 | 10 +++
 modes/classicmode/editor/classiceditor.cpp    | 26 +++++---
 modes/classicmode/editor/classiceditor.h      |  5 +-
 modes/classicmode/game/classicgame.cpp        | 33 ++++------
 modes/classicmode/game/classicgame.h          |  8 +--
 modes/classicmode/game/classicnote.h          |  2 +-
 modes/classicmode/game/context.h              | 12 ++++
 src/application/editorstate.cpp               | 61 ++++++++++++++++---
 src/application/editorstate.h                 |  2 +-
 src/application/gamestate.cpp                 | 16 ++---
 src/application/gamestate.h                   |  2 +
 .../widgets/bpmcalculatorwidget.cpp           | 40 +++---------
 src/application/widgets/bpmcalculatorwidget.h | 13 +++-
 tools/shared/tools/bpmcalculator.h            | 10 +--
 tools/src/bpmcalculator.cpp                   | 29 +++------
 tools/src/music.cpp                           |  2 +-
 19 files changed, 165 insertions(+), 131 deletions(-)
 create mode 100644 core/shared/core/updatedata.h
 create mode 100644 modes/classicmode/game/context.h

diff --git a/core/shared/core/editor.h b/core/shared/core/editor.h
index 4b97629..7d73c7a 100644
--- a/core/shared/core/editor.h
+++ b/core/shared/core/editor.h
@@ -2,6 +2,7 @@
 
 #include <set>
 #include "core/inputtype.h"
+#include "core/updatedata.h"
 #include "core/bpmsection.h"
 
 class Editor
@@ -10,7 +11,7 @@ public:
     virtual ~Editor() = default;
 
     virtual void input(PlayerInput&& inputdata) = 0;
-    virtual void update(const sf::Time& dt) = 0;
+    virtual void update(UpdateData&& updatedata) = 0;
     virtual void draw() const = 0;
 
     inline void setBPMSections(const std::set<BPMSection, BPMSectionCompt>& sections) noexcept
diff --git a/core/shared/core/game.h b/core/shared/core/game.h
index ce125d8..a8520e7 100644
--- a/core/shared/core/game.h
+++ b/core/shared/core/game.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "core/inputtype.h"
+#include "core/updatedata.h"
 
 class Game
 {
@@ -10,6 +11,6 @@ public:
     virtual void run() = 0;
 
     virtual void input(PlayerInput&& inputdata) = 0;
-    virtual void update() = 0;
+    virtual void update(UpdateData&& updatedata) = 0;
     virtual void draw() const = 0;
 };
diff --git a/core/shared/core/timeline.h b/core/shared/core/timeline.h
index 79af060..d5122ab 100644
--- a/core/shared/core/timeline.h
+++ b/core/shared/core/timeline.h
@@ -28,6 +28,9 @@ public:
         expire(_last_visible_note);
         expire(_active_note);
 
+        if (isExpired(_top_note))
+            return;
+
         fetchVisibleNotes();
     }
 
@@ -55,21 +58,20 @@ public:
     {
         _current_offset = offset;
 
+        if (isExpired(_top_note))
+            return;
+
         checkCurrentActiveNote();
         checkForNextActiveNote();
         updateVisibleSprites(_current_offset);
     }
 
-    void drawVisibleNotes() const
+    std::pair<Iterator, Iterator> getVisibleNotes() const
     {
         if (nothingToDraw())
-            return;
+            return std::pair<Iterator, Iterator>();
 
-        std::for_each(_first_visible_note, _last_visible_note,
-                      [](const auto& note)
-                      {
-                          note->draw();
-                      });
+        return std::make_pair(_first_visible_note, _last_visible_note);
     }
 
     void fetchVisibleNotes()
@@ -80,6 +82,9 @@ public:
 
     void findLastVisibleNote(const microsec& music_offset)
     {
+        if (isExpired(_top_note))
+            return;
+
         Iterator note_iterator = _top_note;
         while (isVisiblyClose(note_iterator, music_offset))
         {
diff --git a/core/shared/core/updatedata.h b/core/shared/core/updatedata.h
new file mode 100644
index 0000000..bad6e0e
--- /dev/null
+++ b/core/shared/core/updatedata.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <SFML/System/Time.hpp>
+#include "tools/mathutils.h"
+
+struct UpdateData
+{
+    const microsec timestamp;
+    const sf::Time dt;
+};
diff --git a/modes/classicmode/editor/classiceditor.cpp b/modes/classicmode/editor/classiceditor.cpp
index 8391e25..a6ec52a 100644
--- a/modes/classicmode/editor/classiceditor.cpp
+++ b/modes/classicmode/editor/classiceditor.cpp
@@ -2,15 +2,17 @@
 
 ClassicEditor::ClassicEditor(std::shared_ptr<ClassicGraphicsManager>&& manager) :
     _graphics_manager(manager),
-    _selected_type(Type::UP)
+    _selected_type(Type::UP),
+    _current_time(0)
 {
     _context.graphics_manager = _graphics_manager;
+    _timeline.setNotes({}, 1648648);
 }
 
 void ClassicEditor::input(PlayerInput&& inputdata)
 {
+    _current_time = inputdata.timestamp;
     const auto& event = inputdata.event;
-    const auto offset = _music.fetchOffset();
 
     switch (event.type)
     {
@@ -20,13 +22,13 @@ void ClassicEditor::input(PlayerInput&& inputdata)
 
     case sf::Event::MouseButtonPressed:
     {
-        const auto note = _timeline.getNoteBy(offset);
+        const auto note = _timeline.getNoteBy(_current_time);
         if (_timeline.isExpired(note))
         {
             NoteInitializer init;
             init.context = &_context;
             init.intervals = {};
-            init.perfect_offset = offset;
+            init.perfect_offset = _current_time;
 
             ElementInitializer elem_init;
             elem_init.type = _selected_type;
@@ -45,18 +47,22 @@ void ClassicEditor::input(PlayerInput&& inputdata)
     }
 }
 
-void ClassicEditor::update(const sf::Time& dt)
+void ClassicEditor::update(UpdateData&& updatedata)
 {
-    (void)dt;
-    // TODO!!!
-
-    _timeline.update(_music.fetchOffset());
+    _timeline.update(updatedata.timestamp);
     _timeline.fetchVisibleNotes();
 }
 
 void ClassicEditor::draw() const
 {
-    _timeline.drawVisibleNotes();
+    const auto& graphics_manager = _graphics_manager;
+    auto notes = _timeline.getVisibleNotes();
+
+    std::for_each(notes.first, notes.second,
+                  [graphics_manager](const auto& note)
+                  {
+                      note->draw();
+                  });
 }
 
 void ClassicEditor::selectNoteType(Type type) noexcept
diff --git a/modes/classicmode/editor/classiceditor.h b/modes/classicmode/editor/classiceditor.h
index f41bcb2..5ae51c8 100644
--- a/modes/classicmode/editor/classiceditor.h
+++ b/modes/classicmode/editor/classiceditor.h
@@ -4,7 +4,6 @@
 
 #include "core/editor.h"
 #include "core/timeline.h"
-#include "tools/music.h"
 
 #include "mockclassicnote.h"
 
@@ -16,17 +15,17 @@ public:
     explicit ClassicEditor(std::shared_ptr<ClassicGraphicsManager>&& manager);
 
     virtual void input(PlayerInput&& inputdata) override;
-    virtual void update(const sf::Time& dt) override;
+    virtual void update(UpdateData&& updatedata) override;
     virtual void draw() const override;
 
     void selectNoteType(Type type) noexcept;
 
 private:
-    Music _music;
     Context _context;
 
     std::shared_ptr<ClassicGraphicsManager> _graphics_manager;
     Timeline<MockClassicNote> _timeline;
 
     Type _selected_type;
+    microsec _current_time;
 };
diff --git a/modes/classicmode/game/classicgame.cpp b/modes/classicmode/game/classicgame.cpp
index 469c5eb..0081d79 100644
--- a/modes/classicmode/game/classicgame.cpp
+++ b/modes/classicmode/game/classicgame.cpp
@@ -1,6 +1,7 @@
 #include "classicgame.h"
 #include "classicnote.h"
 #include "classicmapcreator.h"
+#include "graphics/classicgraphicsmanager.h"
 #include "holdmanager.h"
 
 ClassicGame::ClassicGame(std::shared_ptr<ClassicGraphicsManager>&& manager) :
@@ -59,16 +60,11 @@ void ClassicGame::run()
     _context.graphics_manager = _graphics_manager;
 
     auto beatmap = classic::createBeatmap("aa", _context);
-    _music.openFromFile("METEOR.flac");
-    _music.setVolume(10);
-    _music.play();
     _timeline.setNotes(beatmap.notes, beatmap.visibility_offset);
 }
 
 void ClassicGame::input(PlayerInput&& inputdata)
 {
-    inputdata.timestamp = _music.fetchOffset();
-
     switch (inputdata.event.type)
     {
     default:
@@ -77,20 +73,6 @@ void ClassicGame::input(PlayerInput&& inputdata)
 
     case sf::Event::KeyPressed:
     {
-        if (inputdata.event.key.code == sf::Keyboard::Space)
-        {
-            if (_music.isPaused())
-            {
-                _music.play();
-                return;
-            }
-            else
-            {
-                _music.pause();
-                return;
-            }
-        }
-
         auto note_it = _timeline.getActiveNote();
 
         if (!_timeline.isExpired(note_it))
@@ -111,13 +93,20 @@ void ClassicGame::input(PlayerInput&& inputdata)
     }
 }
 
-void ClassicGame::update()
+void ClassicGame::update(UpdateData&& updatedata)
 {
-    _timeline.update(_music.fetchOffset());
+    _timeline.update(updatedata.timestamp);
     _timeline.fetchVisibleNotes();
 }
 
 void ClassicGame::draw() const
 {
-    _timeline.drawVisibleNotes();
+    const auto& graphics_manager = _graphics_manager;
+    auto notes = _timeline.getVisibleNotes();
+
+    std::for_each(notes.first, notes.second,
+                  [graphics_manager](const auto& note)
+                  {
+                      note->draw();
+                  });
 }
diff --git a/modes/classicmode/game/classicgame.h b/modes/classicmode/game/classicgame.h
index a49251f..654d2e4 100644
--- a/modes/classicmode/game/classicgame.h
+++ b/modes/classicmode/game/classicgame.h
@@ -8,9 +8,8 @@
 
 #include "core/game.h"
 #include "core/timeline.h"
-#include "tools/music.h"
 
-#include "classicmode/context.h"
+#include "context.h"
 #include "classicnote.h"
 
 #include "classicmode/classicactions.h"
@@ -26,8 +25,8 @@ public:
 
     virtual void run() override;
 
-    virtual void input(PlayerInput &&inputdata) override;
-    virtual void update() override;
+    virtual void input(PlayerInput&& inputdata) override;
+    virtual void update(UpdateData&& updatedata) override;
     virtual void draw() const override;
 
 private:
@@ -42,6 +41,5 @@ private:
     sf::SoundBuffer _slap_buffer;
     sf::Sound _slap;
 
-    Music _music;
     Context _context;
 };
diff --git a/modes/classicmode/game/classicnote.h b/modes/classicmode/game/classicnote.h
index c3bccbf..a252b9b 100644
--- a/modes/classicmode/game/classicnote.h
+++ b/modes/classicmode/game/classicnote.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "classicmode/context.h"
+#include "context.h"
 #include "core/note.h"
 #include "core/precisionevaluator.h"
 #include "classicmode/noteinitializer.h"
diff --git a/modes/classicmode/game/context.h b/modes/classicmode/game/context.h
new file mode 100644
index 0000000..8d977a9
--- /dev/null
+++ b/modes/classicmode/game/context.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#include <memory>
+
+class ClassicGraphicsManager;
+class HoldManager;
+
+struct Context
+{
+    std::shared_ptr<ClassicGraphicsManager> graphics_manager;
+    std::shared_ptr<HoldManager> hold_manager;
+};
diff --git a/src/application/editorstate.cpp b/src/application/editorstate.cpp
index 176aeb6..c21e637 100644
--- a/src/application/editorstate.cpp
+++ b/src/application/editorstate.cpp
@@ -23,6 +23,9 @@ EditorState::~EditorState()
 
 void EditorState::input(const sf::Event& event)
 {
+    if (event.key.code == sf::Keyboard::Space && event.type == sf::Event::KeyReleased)
+        _music.isPaused() ? _music.play() : _music.pause();
+
     _group->input(event);
 }
 
@@ -38,19 +41,57 @@ void EditorState::draw() const
 
 void EditorState::enter()
 {
+    _music.openFromFile("Uta-test.flac");
+    _music.setVolume(5);
+
     auto& group = _group;
     auto& music = _music;
     auto& editor = _editor;
 
-    _music->openFromFile("Uta-test.flac");
-    _music->setVolume(5);
-
-    _bpm_calculator = std::make_shared<BPMCalculator>(_music);
+    _bpm_calculator = std::make_shared<BPMCalculator>();
+    auto& bpm_calculator = _bpm_calculator;
     std::shared_ptr<BPMCalculatorWidget> bpm_widget = std::make_shared<BPMCalculatorWidget>(_bpm_calculator, _font);
-    bpm_widget->init(_editor);
+
+    auto button_start = std::make_shared<PushButton>("Start", _font);
+    auto button_stop = std::make_shared<PushButton>("Stop", _font);
+    auto button_apply = std::make_shared<PushButton>("Apply", _font);
+
+    button_start->setCallback([bpm_calculator, button_start, button_stop, &music]()
+    {
+        music.play();
+        bpm_calculator->start();
+        button_start->setVisibility(false);
+        button_stop->setVisibility(true);
+    });
+
+    button_stop->setCallback([bpm_calculator, button_start, button_stop, &music]()
+    {
+        music.stop();
+        bpm_calculator->stop();
+        button_start->setVisibility(true);
+        button_stop->setVisibility(false);
+    });
+
+    button_apply->setCallback([&editor, bpm_calculator]()
+    {
+        BPMSection section;
+        section.bpm = bpm_calculator->fetchApproximatedInfo().BPM;
+        section.fraction = 2;
+        section.offset_start = bpm_calculator->getStartingOffset();
+
+        editor->insertBPMSection(std::move(section));
+    });
+
+    BPMCalculatorWidget::Init bpm_widget_init;
+    bpm_widget_init.stop = button_stop;
+    bpm_widget_init.apply = button_apply;
+    bpm_widget_init.start = button_start;
+    bpm_widget_init.current_time = [&music]() -> microsec { return music.fetchOffset(); };
+
+    bpm_widget->init(std::move(bpm_widget_init));
     const auto bpm_widget_callback = [&group, bpm_widget=bpm_widget, &music]()
     {
-        music->stop();
+        music.stop();
         bpm_widget->setVisibility(false);
         group->unblock();
     };
@@ -113,14 +154,14 @@ void EditorState::enter()
         editor->draw();
     };
 
-    callbacks.onInput = [&editor](const sf::Event& event)
+    callbacks.onInput = [&editor, &music](const sf::Event& event)
     {
-        editor->input(PlayerInput{0, event});
+        editor->input(PlayerInput{music.fetchOffset(), event});
     };
 
-    callbacks.onUpdate = [&editor](const sf::Time& dt)
+    callbacks.onUpdate = [&editor, &music](const sf::Time& dt)
     {
-        editor->update(dt);
+        editor->update(UpdateData{music.fetchOffset(), dt});
     };
 
     auto editor_widget = std::make_shared<EditorWidget>(std::move(callbacks));
diff --git a/src/application/editorstate.h b/src/application/editorstate.h
index f1047f3..06d5c8b 100644
--- a/src/application/editorstate.h
+++ b/src/application/editorstate.h
@@ -33,7 +33,7 @@ private:
 
     Callbacks _callbacks;
 
-    std::shared_ptr<Music> _music;
+    Music _music;
     std::shared_ptr<BPMCalculator> _bpm_calculator;
     std::shared_ptr<Group> _group;
 
diff --git a/src/application/gamestate.cpp b/src/application/gamestate.cpp
index cb135b3..f975c6f 100644
--- a/src/application/gamestate.cpp
+++ b/src/application/gamestate.cpp
@@ -13,17 +13,15 @@ GameState::GameState(sf::RenderWindow& game_window, const std::shared_ptr<Game>&
 
 void GameState::input(const sf::Event& event)
 {
-    _game->input({0, event});
+    if (event.key.code == sf::Keyboard::Space && event.type == sf::Event::KeyReleased)
+        _music.isPaused() ? _music.play() : _music.pause();
+
+    _game->input(PlayerInput{_music.fetchOffset(), event});
 }
 
 void GameState::update(const sf::Time& dt)
 {
-    (void)dt;
-    // !!!!!!!!!!!!!!!!!!!!!!
-    // TODO.
-    //
-    // Oh dude... hang in there
-    _game->update();
+    _game->update(UpdateData{_music.fetchOffset(), dt});
 }
 
 void GameState::draw() const
@@ -34,6 +32,10 @@ void GameState::draw() const
 void GameState::enter()
 {
     _game->run();
+
+    _music.openFromFile("METEOR.flac");
+    _music.setVolume(10);
+    _music.play();
 }
 
 void GameState::leave()
diff --git a/src/application/gamestate.h b/src/application/gamestate.h
index a282e61..c6d76f3 100644
--- a/src/application/gamestate.h
+++ b/src/application/gamestate.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "state.h"
+#include "tools/music.h"
 #include <SFML/Graphics/RenderWindow.hpp>
 
 class Group;
@@ -28,6 +29,7 @@ public:
     virtual void leave() override;
 
 private:
+    Music _music;
     std::shared_ptr<Game> _game;
     sf::RenderWindow& _game_window;
 
diff --git a/src/application/widgets/bpmcalculatorwidget.cpp b/src/application/widgets/bpmcalculatorwidget.cpp
index 3ef8016..5fadc65 100644
--- a/src/application/widgets/bpmcalculatorwidget.cpp
+++ b/src/application/widgets/bpmcalculatorwidget.cpp
@@ -29,7 +29,7 @@ void BPMCalculatorWidget::input(const sf::Event& event)
     case sf::Event::KeyPressed:
         if (event.type == sf::Event::KeyPressed && event.key.code == sf::Keyboard::Space)
         {
-            _bpm_calculator->click();
+            _bpm_calculator->click(_current_time());
         }
         break;
     }
@@ -46,7 +46,7 @@ void BPMCalculatorWidget::update(const sf::Time& dt)
     {
         _bpm_value.setString(std::to_string(static_cast<int>(beat_info.BPM)));
 
-        const microsec until_beat = _bpm_calculator->fetchTimeUntilNextBeat();
+        const microsec until_beat = _bpm_calculator->fetchTimeUntilNextBeat(_current_time());
         const auto time_relation = static_cast<long double>(beat_info.interval) / static_cast<long double>(until_beat);
         const auto slider_path_left = _slider->rect().width / time_relation;
         if (slider_path_left < 50)
@@ -111,39 +111,13 @@ void BPMCalculatorWidget::setPosition(const sf::Vector2f &position)
     Window::setPosition(position);
 }
 
-void BPMCalculatorWidget::init(const std::unique_ptr<Editor>& _editor)
+void BPMCalculatorWidget::init(Init &&init)
 {
-    auto& bpm_calculator = _bpm_calculator;
+    _button_start = init.start;
+    _button_stop = init.stop;
+    _button_apply = init.apply;
 
-    _button_start = std::make_shared<PushButton>("Start", _font);
-    _button_stop = std::make_shared<PushButton>("Stop", _font);
-    _button_apply = std::make_shared<PushButton>("Apply", _font);
-
-    _button_start->setCallback([bpm_calculator, button_start=_button_start, button_stop=_button_stop]()
-    {
-        bpm_calculator->music()->play(); // Remove when global play/stop available
-        bpm_calculator->start();
-        button_start->setVisibility(false);
-        button_stop->setVisibility(true);
-    });
-
-    _button_stop->setCallback([bpm_calculator, button_start=_button_start, button_stop=_button_stop]()
-    {
-        bpm_calculator->music()->stop(); // Remove when global play/stop available
-        bpm_calculator->stop();
-        button_start->setVisibility(true);
-        button_stop->setVisibility(false);
-    });
-
-    _button_apply->setCallback([&_editor, bpm_calculator]()
-    {
-        BPMSection section;
-        section.bpm = bpm_calculator->fetchApproximatedInfo().BPM;
-        section.fraction = 2;
-        section.offset_start = bpm_calculator->getStartingOffset();
-
-        _editor->insertBPMSection(std::move(section));
-    });
+    _current_time = init.current_time;
 
     addChild(_button_start);
     addChild(_button_stop);
diff --git a/src/application/widgets/bpmcalculatorwidget.h b/src/application/widgets/bpmcalculatorwidget.h
index 31255fc..1390de3 100644
--- a/src/application/widgets/bpmcalculatorwidget.h
+++ b/src/application/widgets/bpmcalculatorwidget.h
@@ -8,6 +8,7 @@
 #include <SFML/Graphics/Text.hpp>
 #include <SFML/Audio/Sound.hpp>
 #include <SFML/Audio/SoundBuffer.hpp>
+#include "tools/mathutils.h"
 
 class BPMCalculator;
 class Editor;
@@ -15,6 +16,15 @@ class Editor;
 class BPMCalculatorWidget : public Window
 {
 public:
+
+    struct Init
+    {
+        std::shared_ptr<PushButton> start;
+        std::shared_ptr<PushButton> stop;
+        std::shared_ptr<PushButton> apply;
+        std::function<microsec(void)> current_time;
+    };
+
     explicit BPMCalculatorWidget(const std::shared_ptr<BPMCalculator>& bpm_calculator, const std::shared_ptr<sf::Font> &font);
 
     virtual void input(const sf::Event& event) override;
@@ -26,7 +36,7 @@ public:
 
     virtual void setVisibility(bool is_visible = true) override;
 
-    void init(const std::unique_ptr<Editor>& _editor);
+    void init(Init&& init);
 
 private:
     std::shared_ptr<PushButton> _button_start;
@@ -41,5 +51,6 @@ private:
     bool _ticked;
 
     sf::Text _bpm_value;
+    std::function<microsec(void)> _current_time;
 };
 
diff --git a/tools/shared/tools/bpmcalculator.h b/tools/shared/tools/bpmcalculator.h
index 55a259a..d9348b6 100644
--- a/tools/shared/tools/bpmcalculator.h
+++ b/tools/shared/tools/bpmcalculator.h
@@ -7,19 +7,16 @@
 class BPMCalculator
 {
 public:
-    explicit BPMCalculator(const std::shared_ptr<Music>& music);
-
-    void setMusic(const std::shared_ptr<Music>& music);
-    std::shared_ptr<Music> music() const;
+    explicit BPMCalculator();
 
     void start();
     void stop();
-    void click();
+    void click(const microsec& offset);
 
     bool calculating() const;
 
     const beat_utils::BeatInfo& fetchApproximatedInfo();
-    microsec fetchTimeUntilNextBeat();
+    microsec fetchTimeUntilNextBeat(const microsec& offset);
 
     microsec getStartingOffset() const;
     void setStartingOffset(microsec offset);
@@ -29,7 +26,6 @@ private:
     bool _need_recalculate;
     bool _calculating;
 
-    std::shared_ptr<Music> _music;
     std::vector<microsec> _deltas;
     microsec _previous_click_offset;
     microsec _first_click_offset;
diff --git a/tools/src/bpmcalculator.cpp b/tools/src/bpmcalculator.cpp
index 52f1540..26c64c8 100644
--- a/tools/src/bpmcalculator.cpp
+++ b/tools/src/bpmcalculator.cpp
@@ -3,8 +3,7 @@
 #include <numeric>
 #include <iostream>
 
-BPMCalculator::BPMCalculator(const std::shared_ptr<Music>& music) :
-    _music(music)
+BPMCalculator::BPMCalculator()
 {
     reset();
 }
@@ -18,17 +17,6 @@ void BPMCalculator::reset()
     _need_recalculate = true;
 }
 
-void BPMCalculator::setMusic(const std::shared_ptr<Music>& music)
-{
-    _music = music;
-    reset();
-}
-
-std::shared_ptr<Music> BPMCalculator::music() const
-{
-    return _music;
-}
-
 void BPMCalculator::start()
 {
     reset();
@@ -46,25 +34,24 @@ bool BPMCalculator::calculating() const
     return _calculating;
 }
 
-void BPMCalculator::click()
+void BPMCalculator::click(const microsec &offset)
 {
     if (!_calculating)
         return;
 
-    const microsec click_offset = _music->fetchOffset();
     _need_recalculate = true;
 
     if (_previous_click_offset == 0)
     {
-        _previous_click_offset = click_offset;
-        _first_click_offset = click_offset;
+        _previous_click_offset = offset;
+        _first_click_offset = offset;
         return;
     }
 
-    const microsec delta = click_offset - _previous_click_offset;
+    const microsec delta = offset - _previous_click_offset;
     _deltas.emplace_back(delta);
 
-    _previous_click_offset = click_offset;
+    _previous_click_offset = offset;
 }
 
 const beat_utils::BeatInfo& BPMCalculator::fetchApproximatedInfo()
@@ -98,9 +85,9 @@ void BPMCalculator::moveStartingOffsetBy(microsec shift)
     _first_click_offset += shift;
 }
 
-microsec BPMCalculator::fetchTimeUntilNextBeat()
+microsec BPMCalculator::fetchTimeUntilNextBeat(const microsec& offset)
 {
-    const microsec actual_offset = _music->fetchOffset() - getStartingOffset();
+    const microsec actual_offset = offset - getStartingOffset();
 
     return actual_offset % fetchApproximatedInfo().interval;
 }
diff --git a/tools/src/music.cpp b/tools/src/music.cpp
index 833f16c..91f678a 100644
--- a/tools/src/music.cpp
+++ b/tools/src/music.cpp
@@ -29,7 +29,7 @@ void Music::stop()
 
 bool Music::isPaused() const
 {
-    return (_music.getStatus() == sf::Music::Paused);
+    return (_music.getStatus() != sf::Music::Playing);
 }
 
 void Music::setVolume(int volume)