#include "calculation_controller.h"
#include "../constant.h"
#include "../apps_container.h"
#include "../../poincare/src/layout/baseline_relative_layout.h"
#include "../../poincare/src/layout/string_layout.h"
#include <poincare.h>
#include <assert.h>

using namespace Poincare;
using namespace Shared;

namespace Regression {

CalculationController::CalculationController(Responder * parentResponder, ButtonRowController * header, Store * store) :
  TabTableController(parentResponder, this, Metric::CommonTopMargin, Metric::CommonRightMargin, Metric::CommonBottomMargin, Metric::CommonLeftMargin, this, true),
  ButtonRowDelegate(header, nullptr),
  m_titleCells{EvenOddMessageTextCell(KDText::FontSize::Small), EvenOddMessageTextCell(KDText::FontSize::Small), EvenOddMessageTextCell(KDText::FontSize::Small), EvenOddMessageTextCell(KDText::FontSize::Small), EvenOddMessageTextCell(KDText::FontSize::Small),
    EvenOddMessageTextCell(KDText::FontSize::Small), EvenOddMessageTextCell(KDText::FontSize::Small), EvenOddMessageTextCell(KDText::FontSize::Small), EvenOddMessageTextCell(KDText::FontSize::Small), EvenOddMessageTextCell(KDText::FontSize::Small)},
  m_r2TitleCell(1.0f, 0.5f),
  m_columnTitleCell(EvenOddDoubleBufferTextCell(&m_selectableTableView)),
  m_calculationCells{EvenOddBufferTextCell(KDText::FontSize::Small), EvenOddBufferTextCell(KDText::FontSize::Small), EvenOddBufferTextCell(KDText::FontSize::Small), EvenOddBufferTextCell(KDText::FontSize::Small), EvenOddBufferTextCell(KDText::FontSize::Small)},
  m_store(store)
{
  for (int k = 0; k < k_maxNumberOfDisplayableRows/2; k++) {
    m_calculationCells[k].setTextColor(Palette::GreyDark);
    m_doubleCalculationCells[k].setTextColor(Palette::GreyDark);
    m_doubleCalculationCells[k].setParentResponder(&m_selectableTableView);
  }
  m_r2Layout = new BaselineRelativeLayout(new StringLayout("r", 1, KDText::FontSize::Small), new StringLayout("2", 1, KDText::FontSize::Small), BaselineRelativeLayout::Type::Superscript);
}

CalculationController::~CalculationController() {
  if (m_r2Layout) {
    delete m_r2Layout;
    m_r2Layout = nullptr;
  }
}

const char * CalculationController::title() {
  return I18n::translate(I18n::Message::StatTab);
}

bool CalculationController::handleEvent(Ion::Events::Event event) {
  if (event == Ion::Events::Up) {
    m_selectableTableView.deselectTable();
    app()->setFirstResponder(tabController());
    return true;
  }
  return false;
}

void CalculationController::didBecomeFirstResponder() {
  if (m_selectableTableView.selectedRow() == -1) {
    m_selectableTableView.selectCellAtLocation(1, 0);
  } else {
    m_selectableTableView.selectCellAtLocation(m_selectableTableView.selectedColumn(), m_selectableTableView.selectedRow());
  }
  TabTableController::didBecomeFirstResponder();
}

void CalculationController::tableViewDidChangeSelection(SelectableTableView * t, int previousSelectedCellX, int previousSelectedCellY) {
  /* To prevent selecting cell with no content (top left corner of the table),
   * as soon as the selected cell is the top left corner, we either reselect
   * the previous cell or select the tab controller depending on from which cell
   * the selection comes. This trick does not create an endless loop as the
   * previous cell cannot be the top left corner cell if it also is the
   * selected one. */
  if (t->selectedRow() == 0 && t->selectedColumn() == 0) {
    if (previousSelectedCellX == 0 && previousSelectedCellY == 1) {
      m_selectableTableView.deselectTable();
      app()->setFirstResponder(tabController());
    } else {
      t->selectCellAtLocation(previousSelectedCellX, previousSelectedCellY);
    }
  }
  if (t->selectedColumn() == 1 && t->selectedRow() >= 0 && t->selectedRow() < 6) {
    EvenOddDoubleBufferTextCell * myCell = (EvenOddDoubleBufferTextCell *)t->cellAtLocation(t->selectedColumn(), t->selectedRow());
    bool firstSubCellSelected = true;
    if (previousSelectedCellX == 1 && previousSelectedCellY >= 0 && previousSelectedCellY < 6) {
      EvenOddDoubleBufferTextCell * myPreviousCell = (EvenOddDoubleBufferTextCell *)t->cellAtLocation(previousSelectedCellX, previousSelectedCellY);
      firstSubCellSelected = myPreviousCell->firstTextSelected();
    }
    myCell->selectFirstText(firstSubCellSelected);
    app()->setFirstResponder(myCell);
  } else {
    if (previousSelectedCellX == 1 && previousSelectedCellY >= 0 && previousSelectedCellY < 6) {
      EvenOddDoubleBufferTextCell * myPreviousCell = (EvenOddDoubleBufferTextCell *)t->cellAtLocation(previousSelectedCellX, previousSelectedCellY);
      if (app()->firstResponder()->commonAncestorWith(myPreviousCell) == myPreviousCell) {
        app()->setFirstResponder(t);
      }
    }
  }
}

bool CalculationController::isEmpty() const {
  if (m_store->numberOfPairs() == 0) {
    return true;
  }
  return false;
}

I18n::Message CalculationController::emptyMessage() {
  return I18n::Message::NoValueToCompute;
}

Responder * CalculationController::defaultController() {
  return tabController();
}

int CalculationController::numberOfRows() {
  return k_totalNumberOfRows;
}

int CalculationController::numberOfColumns() {
  return k_totalNumberOfColumns;
}

void CalculationController::willDisplayCellAtLocation(HighlightCell * cell, int i, int j) {
  EvenOddCell * myCell = (EvenOddCell *)cell;
  myCell->setEven(j%2 == 0);
  myCell->setHighlighted(i == m_selectableTableView.selectedColumn() && j == m_selectableTableView.selectedRow());
  if (j == 0 && i > 0) {
    EvenOddDoubleBufferTextCell * myCell = (EvenOddDoubleBufferTextCell *)cell;
    myCell->setFirstText("x");
    myCell->setSecondText("y");
    return;
  }
  if (i == 0) {
    if (j == 10) {
      EvenOddExpressionCell * myCell = (EvenOddExpressionCell *)cell;
      myCell->setExpression(m_r2Layout);
      return;
    }
    EvenOddMessageTextCell * myCell = (EvenOddMessageTextCell *)cell;
    if (j == 0) {
      myCell->setMessage(I18n::Message::Default);
      return;
    }
    myCell->setAlignment(1.0f, 0.5f);
    I18n::Message titles[k_totalNumberOfRows-1] = {I18n::Message::Mean, I18n::Message::Sum, I18n::Message::SquareSum, I18n::Message::StandardDeviation, I18n::Message::Deviation, I18n::Message::NumberOfDots, I18n::Message::Covariance, I18n::Message::Sxy, I18n::Message::R, I18n::Message::Default};
    myCell->setMessage(titles[j-1]);
    return;
  }
  if (i == 1 && j > 0 && j < 6) {
    ArgCalculPointer calculationMethods[(k_totalNumberOfRows-1)/2] = {&Store::meanOfColumn, &Store::sumOfColumn,
      &Store::squaredValueSumOfColumn, &Store::standardDeviationOfColumn, &Store::varianceOfColumn};
    float calculation1 = (m_store->*calculationMethods[j-1])(0);
    float calculation2 = (m_store->*calculationMethods[j-1])(1);
    EvenOddDoubleBufferTextCell * myCell = (EvenOddDoubleBufferTextCell *)cell;
    char buffer[Complex::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits)];
    Complex::convertFloatToText(calculation1, buffer, Complex::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits), Constant::LargeNumberOfSignificantDigits);
    myCell->setFirstText(buffer);
    Complex::convertFloatToText(calculation2, buffer, Complex::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits), Constant::LargeNumberOfSignificantDigits);
    myCell->setSecondText(buffer);
    return;
  }
  if (i == 1 && j > 5) {
    CalculPointer calculationMethods[(k_totalNumberOfRows-1)/2] = {&Store::numberOfPairs, &Store::covariance,
      &Store::columnProductSum, &Store::correlationCoefficient, &Store::squaredCorrelationCoefficient};
    float calculation = (m_store->*calculationMethods[j-6])();
    EvenOddBufferTextCell * myCell = (EvenOddBufferTextCell *)cell;
    char buffer[Complex::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits)];
    Complex::convertFloatToText(calculation, buffer, Complex::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits), Constant::LargeNumberOfSignificantDigits);
    myCell->setText(buffer);
    return;
  }
}

KDCoordinate CalculationController::columnWidth(int i) {
  return k_cellWidth;
}

KDCoordinate CalculationController::rowHeight(int j) {
  return k_cellHeight;
}

HighlightCell * CalculationController::reusableCell(int index, int type) {
  if (type == 0) {
    assert(index < k_maxNumberOfDisplayableRows);
    return &m_titleCells[index];
  }
  if (type == 1) {
    assert(index == 0);
    return &m_r2TitleCell;
  }
  if (type == 2) {
    assert(index == 0);
    return &m_columnTitleCell;
  }
  if (type == 3) {
    assert(index < k_totalNumberOfRows/2);
    return &m_doubleCalculationCells[index];
  }
  assert(index < k_totalNumberOfRows/2);
  return &m_calculationCells[index];
}

int CalculationController::reusableCellCount(int type) {
  if (type == 0) {
    return k_maxNumberOfDisplayableRows;
  }
  if (type == 1) {
    return 1;
  }
  if (type == 2) {
    return 1;
  }
  if (type == 3) {
    return k_maxNumberOfDisplayableRows/2;
  }
  return k_maxNumberOfDisplayableRows/2;
}

int CalculationController::typeAtLocation(int i, int j) {
  if (i == 0 && j == 10) {
    return 1;
  }
  if (i == 0) {
    return 0;
  }
  if (j == 0) {
    return 2;
  }
  if (j > 0 && j < 6) {
    return 3;
  }
  return 4;
}

Responder * CalculationController::tabController() const {
  return (parentResponder()->parentResponder()->parentResponder());
}

}