#pragma once

#include <cstdint>
#include <functional>
#include <memory>

#include <QFileDialog>
#include <QLinkedList>
#include <QMainWindow>
#include <QMessageBox>
#include <QStyledItemDelegate>
#include <QThread>

#include "Common.hpp"
#include "EditorWidget.hpp"
#include "ProjectModel.hpp"

#include "ui_MainWindow.h"

#include <amuse/Common.hpp>
#include <amuse/Sequencer.hpp>
#include <amuse/Voice.hpp>

#define MaxRecentFiles 4

namespace amuse {
class Engine;
}

namespace boo {
struct IAudioVoiceEngine;
}

namespace Ui {
class MainWindow;
}

class ADSREditor;
class CurveEditor;
class KeymapEditor;
class LayersEditor;
class MainWindow;
class SampleEditor;
class SongGroupEditor;
class SoundGroupEditor;
class SoundMacroEditor;
class StudioSetupWidget;
class VoiceAllocator;

class QProgressDialog;
class QUndoStack;

enum BackgroundTaskId { TaskOpen, TaskImport, TaskExport, TaskReloadSamples };

class BackgroundTask : public QObject {
  Q_OBJECT
  int m_id;
  std::function<void(BackgroundTask&)> m_task;
  UIMessenger m_threadMessenger;
  bool m_cancelled = false;

public:
  explicit BackgroundTask(int id, std::function<void(BackgroundTask&)>&& task)
  : m_id(id), m_task(std::move(task)), m_threadMessenger(this) {}
  bool isCanceled() const {
    QCoreApplication::processEvents();
    return m_cancelled;
  }
  UIMessenger& uiMessenger() { return m_threadMessenger; }

signals:
  void setMinimum(int minimum);
  void setMaximum(int maximum);
  void setValue(int value);
  void setLabelText(const QString& text);
  void finished(int id);

public slots:
  void run() {
    m_task(*this);
    emit finished(m_id);
  }
  void cancel() { m_cancelled = true; }
};

class TreeDelegate : public QStyledItemDelegate {
  Q_OBJECT
  MainWindow& m_window;

public:
  explicit TreeDelegate(MainWindow& window, QObject* parent = Q_NULLPTR)
  : QStyledItemDelegate(parent), m_window(window) {}

  bool editorEvent(QEvent* event, QAbstractItemModel* model, const QStyleOptionViewItem& option,
                   const QModelIndex& index) override;
public slots:
  void doExportGroup();
  void doFindUsages();
  void doCut();
  void doCopy();
  void doPaste();
  void doDuplicate();
  void doDelete();
  void doRename();
};

class MainWindow : public QMainWindow {
  friend class MIDIReader;
  friend class ProjectModel;
  friend class GroupNodeUndoCommand;
  friend class TreeDelegate;
  Q_OBJECT
  Ui::MainWindow m_ui;
  QAction* m_goBack;
  QAction* m_goForward;
  QLinkedList<ProjectModel::INode*> m_navList;
  QLinkedList<ProjectModel::INode*>::iterator m_navIt;
  QAction* m_clearRecentFileAct;
  QAction* m_recentFileActs[MaxRecentFiles];
  TreeDelegate m_treeDelegate;
  UIMessenger m_mainMessenger;
  ProjectModel* m_projectModel = nullptr;
  QWidget* m_faceSvg;
  SongGroupEditor* m_songGroupEditor = nullptr;
  SoundGroupEditor* m_soundGroupEditor = nullptr;
  SoundMacroEditor* m_soundMacroEditor = nullptr;
  ADSREditor* m_adsrEditor = nullptr;
  CurveEditor* m_curveEditor = nullptr;
  KeymapEditor* m_keymapEditor = nullptr;
  LayersEditor* m_layersEditor = nullptr;
  SampleEditor* m_sampleEditor = nullptr;
  StudioSetupWidget* m_studioSetup = nullptr;
  QFileDialog m_openDirectoryDialog;
  QFileDialog m_openFileDialog;
  QFileDialog m_newFileDialog;

  std::unique_ptr<boo::IAudioVoiceEngine> m_voxEngine;
  std::unique_ptr<VoiceAllocator> m_voxAllocator;
  std::unique_ptr<amuse::Engine> m_engine;
  amuse::ObjToken<amuse::Voice> m_lastSound;
  amuse::ObjToken<amuse::Sequencer> m_interactiveSeq;
  int m_velocity = 90;
  float m_pitch = 0.f;
  int8_t m_ctrlVals[128] = {};
  float m_auxAVol = 0.f;
  float m_auxBVol = 0.f;
  bool m_uiDisabled = false;
  bool m_clipboardAmuseData = false;

  QUndoStack* m_undoStack;

  QMetaObject::Connection m_cutConn;
  QMetaObject::Connection m_copyConn;
  QMetaObject::Connection m_pasteConn;
  QMetaObject::Connection m_deleteConn;
  QMetaObject::Connection m_canEditConn;

  BackgroundTask* m_backgroundTask = nullptr;
  QProgressDialog* m_backgroundDialog = nullptr;
  QThread m_backgroundThread;

  uint64_t m_timerFireCount = 0;
  int m_peakVoices = 0;

  void connectMessenger(UIMessenger* messenger, Qt::ConnectionType type);

  void updateWindowTitle();
  void updateRecentFileActions();
  void updateNavigationButtons();
  bool setProjectPath(const QString& path);
  void refreshAudioIO();
  void refreshMIDIIO();
  void timerEvent(QTimerEvent* ev) override;
  void setSustain(bool sustain);
  void keyPressEvent(QKeyEvent* ev) override;
  void keyReleaseEvent(QKeyEvent* ev) override;

  void startBackgroundTask(int id, const QString& windowTitle, const QString& label,
                           std::function<void(BackgroundTask&)>&& task);

  bool _setEditor(EditorWidget* widget, bool appendNav = true);

public:
  explicit MainWindow(QWidget* parent = Q_NULLPTR);
  ~MainWindow() override;

  bool openProject(const QString& path);

  bool openEditor(ProjectModel::SongGroupNode* node, bool appendNav = true);
  bool openEditor(ProjectModel::SoundGroupNode* node, bool appendNav = true);
  bool openEditor(ProjectModel::SoundMacroNode* node, bool appendNav = true);
  bool openEditor(ProjectModel::ADSRNode* node, bool appendNav = true);
  bool openEditor(ProjectModel::CurveNode* node, bool appendNav = true);
  bool openEditor(ProjectModel::KeymapNode* node, bool appendNav = true);
  bool openEditor(ProjectModel::LayersNode* node, bool appendNav = true);
  bool openEditor(ProjectModel::SampleNode* node, bool appendNav = true);
  bool openEditor(ProjectModel::INode* node, bool appendNav = true);
  void closeEditor();

  ProjectModel::INode* getEditorNode() const;
  EditorWidget* getEditorWidget() const;
  amuse::ObjToken<amuse::Voice> startEditorVoice(uint8_t key, uint8_t vel);
  amuse::ObjToken<amuse::Voice> startSFX(amuse::GroupId groupId, amuse::SFXId sfxId);
  amuse::ObjToken<amuse::Sequencer> startSong(amuse::GroupId groupId, amuse::SongId songId,
                                              const unsigned char* arrData);
  void pushUndoCommand(EditorUndoCommand* cmd);
  void updateFocus();
  void aboutToDeleteNode(ProjectModel::INode* node);
  bool askAboutSave();
  void closeEvent(QCloseEvent* ev) override;
  void showEvent(QShowEvent* ev) override;

  QString getGroupName(ProjectModel::GroupNode* group) const;
  ProjectModel::GroupNode* getSelectedGroupNode() const;
  QString getSelectedGroupName() const;
  void _recursiveExpandOutline(const QModelIndex& filterIndex) const;
  void recursiveExpandAndSelectOutline(const QModelIndex& index) const;

  ProjectModel* projectModel() const { return m_projectModel; }
  UIMessenger& uiMessenger() { return m_mainMessenger; }

  void setItemEditFlags(AmuseItemEditFlags flags);
  void setItemNewEnabled(bool enabled);
  AmuseItemEditFlags outlineEditFlags();
  bool isUiDisabled() const { return m_uiDisabled; }
  void findUsages(ProjectModel::INode* node);

public slots:
  void newAction();
  void _newAction(const QString& path);
  void openAction();
  void _openAction(const QString& path);
  void openRecentFileAction();
  void clearRecentFilesAction();
  void saveAction();
  void revertAction();
  void reloadSampleDataAction();
  void importAction();
  void _importAction(const QString& path);
  void importSongsAction();
  void _importSongsAction(const QString& path);
  void exportAction();
  void importHeadersAction();
  void _importHeadersAction(const QString& path);
  void exportHeadersAction();
  void _exportHeadersAction(const QString& path);

  void newSubprojectAction();
  void newSFXGroupAction();
  void newSongGroupAction();
  void newSoundMacroAction();
  void newADSRAction();
  void newCurveAction();
  void newKeymapAction();
  void newLayersAction();

  void goForward();
  void goBack();

  void aboutToShowAudioIOMenu();
  void aboutToShowMIDIIOMenu();

  void setAudioIO();
  void setMIDIIO(bool checked);

  void aboutAmuseAction();
  void aboutQtAction();

  void notePressed(int key);
  void noteReleased();
  void velocityChanged(int vel);
  void modulationChanged(int mod);
  void pitchChanged(int pitch);
  void killSounds();
  void fxPressed();
  void volumeChanged(int vol);
  void auxAChanged(int vol);
  void auxBChanged(int vol);

  void outlineCutAction();
  void outlineCopyAction();
  void outlinePasteAction();
  void outlineDeleteAction();

  void onFocusChanged(QWidget* old, QWidget* now);
  void onClipboardChanged();
  void outlineItemActivated(const QModelIndex& index);
  void onOutlineSelectionChanged(const QItemSelection& selected, const QItemSelection& deselected);
  void onTextSelect();
  void onTextDelete();
  void cleanChanged(bool clean);

  void studioSetupHidden();
  void studioSetupShown();

  void onBackgroundTaskFinished(int id);

  QMessageBox::StandardButton msgInformation(const QString& title, const QString& text,
                                             QMessageBox::StandardButtons buttons = QMessageBox::Ok,
                                             QMessageBox::StandardButton defaultButton = QMessageBox::NoButton);
  int msgQuestion(const QString& title, const QString& text, const QString& button0Text,
                  const QString& button1Text = QString(), const QString& button2Text = QString(),
                  int defaultButtonNumber = 0, int escapeButtonNumber = -1);
  QMessageBox::StandardButton
  msgQuestion(const QString& title, const QString& text,
              QMessageBox::StandardButtons buttons = QMessageBox::StandardButtons(QMessageBox::Yes | QMessageBox::No),
              QMessageBox::StandardButton defaultButton = QMessageBox::NoButton);
  QMessageBox::StandardButton msgWarning(const QString& title, const QString& text,
                                         QMessageBox::StandardButtons buttons = QMessageBox::Ok,
                                         QMessageBox::StandardButton defaultButton = QMessageBox::NoButton);
  QMessageBox::StandardButton msgCritical(const QString& title, const QString& text,
                                          QMessageBox::StandardButtons buttons = QMessageBox::Ok,
                                          QMessageBox::StandardButton defaultButton = QMessageBox::NoButton);
};