#ifndef DEMONSTRATION_WIDGET_H
#define DEMONSTRATION_WIDGET_H

#include "../../Validator/validator.h"
#include "SourceCode/BusinessLogic/businessLogic.h"
#include "SourceCode/BusinessLogic/hashHeaderFiles.h"
#include "hashTable.h"
#include "ui_demonstrationWidget.h"

#include <algorithm>
#include <array>
#include <memory>
#include <thread>

#include <QChartView>
#include <QLineSeries>
#include <QStringListModel>
#include <QtCharts>

class DemonstrationWidget
    : public QWidget,
      protected Ui::DemonstrationWidget,
      public BusinessLogic::Hash::Table::Pattern::InterfaceSubscriber {
public:
  using value_type = BusinessLogic::Hash::Table::Abstract::value_type;
  using table_type = BusinessLogic::Hash::Table::Abstract;

private:
  struct TableInformation {
  public:
    /* Qt containers */
    QLineSeries *m_pSeriesNumberOfCollisions;

    /* If successful */
    std::pair<size_t, size_t> m_lastCoord;
    size_t m_numberOfSuccesses;
    size_t m_lastCollision;
    size_t m_maxCollision;
    double m_lastCoefficient;
    double m_maxCoefficient;

    /* If unsuccessful */
    size_t m_numberOfFailures;

    /* In any case */
    value_type m_lastValue;
    bool m_lastInsertion;

  public:
    TableInformation(const TableInformation &) = delete;
    TableInformation(TableInformation &&) = delete;

    TableInformation(QLineSeries *maxCollision)
        : m_pSeriesNumberOfCollisions(maxCollision) {
      clear();
    };

  public:
    void clear();
  };

private: // Event filter
  virtual bool eventFilter(QObject *target, QEvent *event) override {
    if (target == m_pChartCollisionsView) {
      QChartView *view = dynamic_cast<QChartView *>(target);
      QChart *chart = view->chart();

      switch (event->type()) {
      case QEvent::Wheel: {
        QWheelEvent *currentEvent = dynamic_cast<QWheelEvent *>(event);

        qreal factor = currentEvent->angleDelta().y() > 0 ? 0.9 : 1.1;
        QRectF rect = QRectF(chart->plotArea().left(), chart->plotArea().top(),
                             chart->plotArea().width() * factor,
                             chart->plotArea().height() * factor);

        QPointF mousePos = view->mapFromGlobal(QCursor::pos());
        rect.moveCenter(mousePos);
        chart->zoomIn(rect);

        QPointF delta = chart->plotArea().center() - mousePos;
        chart->scroll(delta.x(), -delta.y());

        return true;
      } break;
      default: {
        return false;
      } break;
      }
    }
    return false;
  }

public:
  enum class TableType : short { Chain, OpenAdressing, Indefined };
  enum class RelationshipType : short { One, Family, Indefined };

private:
  /*
   *  Constants
   */
  static constexpr char firstChar = '!';
  static constexpr char endChar = '~';

  QChartView *m_pChartCollisionsView;
  QStandardItemModel *m_pStandardModel;
  bool m_stop;

  /*
   *  Business logic
   */
  std::shared_ptr<BusinessLogic::Hash::Function::Abstract::Creator> m_pFunction;
  std::shared_ptr<BusinessLogic::Hash::Function::One::Creator>
      m_complicatedFunction;
  std::shared_ptr<BusinessLogic::Hash::Algorithm::Abstract::Creator>
      m_pAlgorithm;
  size_t m_alphabetPower;
  std::unique_ptr<BusinessLogic::Hash::Table::Abstract> m_pTable;
  TableInformation m_tableInformation;

  /*
   *  HTML tags
   */
  static constexpr auto m_fontBeginColorHTML = R"(<font color="%1">)";
  static constexpr auto m_fontEndHTML = R"(</font>)";

public:
  DemonstrationWidget(QWidget *pWidget = nullptr);

public: // Custom slots
  virtual void successfulInsertion(const table_type *, const value_type &,
                                   std::pair<size_t, size_t>, size_t) override;
  virtual void unsuccessfulInsertion(const table_type *,
                                     const value_type &) override;

private:
  /*
   * Business logic
   */
  TableType getCurrentTableType() const {
    TableType result;
    result = {m_rbChains->isChecked()          ? TableType::Chain
              : m_rbOpenAdressing->isChecked() ? TableType::OpenAdressing
                                               : TableType::Indefined};
    if (result == TableType::Indefined) {
      throw std::invalid_argument("table not defined");
    }
    return result;
  }
  RelationshipType getCurrentFunctionType() const {
    RelationshipType result;
    result = {m_rbEquivalent->isChecked()   ? RelationshipType::One
              : m_rbStandart->isChecked()   ? RelationshipType::One
              : m_rbFNV1a32bit->isChecked() ? RelationshipType::Family
                                            : RelationshipType::Indefined};
    if (result == RelationshipType::Indefined) {
      throw std::invalid_argument("function not defined");
    }
    return result;
  }
  RelationshipType getCurrentAlgorythmType() const {
    RelationshipType result;
    result = {m_rbLinearProbing->isChecked()         ? RelationshipType::One
              : m_rbQuadraticProbing->isChecked()    ? RelationshipType::One
              : m_rbPseudorandomProbing->isChecked() ? RelationshipType::Family
              : m_rbDoubleHashing->isChecked()       ? RelationshipType::Family
                                               : RelationshipType::Indefined};
    if (result == RelationshipType::Indefined) {
      throw std::invalid_argument("algorythm not defined");
    }
    return result;
  }

  auto getCurrentFactory() const;
  void updateFunctionCreator();
  void updateAlgorithmCreator();
  void deleteModel();
  void resetAxes() {
    m_pChartCollisionsView->chart()
        ->axes(Qt::Horizontal)
        .front()
        ->setRange(1, 2);
    m_pChartCollisionsView->chart()->axes(Qt::Vertical).front()->setRange(0, 1);
  }
  QString toQString(const value_type &value) {
    auto convert = value;
    unsigned size =
        std::remove(convert.begin(), convert.end(), '\0') - convert.begin();
    return QString::fromLatin1(convert.data(), size);
  }
  value_type toStdArray(std::string &&value) const {
    value_type result = {'\0', '\0', '\0', '\0', firstChar};
    std::copy(value.rbegin(), value.rend(), result.rbegin());
    return result;
  }
  value_type &next(value_type &value) const;
  bool checkBeforeInsertion(bool);

  /*
   *   GUI and displaying
   */
  QString getColorTextHTML(const QString &text, const char *const color) const;
  void outputMessage(const QString &text, const char *const color);
  void updateColumns(size_t rowIndex);
  void updateCharts();
  void updateTableView();
  void setEnabledCreateHashTable(bool flag);
  void setEnabledInsertingProcess(bool flag);

public slots:
  void slotTabSwitched(int index) {
    if (index == 1) {
      QSplitter *splitter = findChild<QSplitter *>("");
      auto children = splitter->children();
      QList<int> sizes{dynamic_cast<QWidget *>(children[0])->minimumHeight(),
                       dynamic_cast<QWidget *>(children[1])->minimumHeight()};
      splitter->setSizes(sizes);
    }
  }

private slots:
  void slotUpdateAdditionalInputData();
  void slotClickedReset();
  void slotClickedApply();
  void slotClickedMakeItems();
  void slotClickedInsert();
  void slotClickedStatistics();
  void slotClickedFindFree();
  void slotClickedStop();
  void slotClickedFocus();
};

#endif // DEMONSTRATION_WIDGET_H