/*
 * Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
 *
 * See the LICENSE file for terms of use.
 */
#include "TreeViewExample.h"

#include <iostream>

#include <Wt/WApplication.h>
#include <Wt/WContainerWidget.h>
#include <Wt/WEnvironment.h>
#include <Wt/WPanel.h>
#include <Wt/WPushButton.h>
#include <Wt/WStandardItem.h>
#include <Wt/WStandardItemModel.h>
#include <Wt/WText.h>
#include <Wt/WTreeView.h>

static const char *weatherIcons[] = {
  "sun01.png",
  "cloudy01.png",
  "w_cloud.png",
  "rain.png",
  "storm.png",
  "snow.png"
};

TreeViewModel::TreeViewModel()
  : belgium_(nullptr)
{
  update();
}

bool TreeViewModel::update()
{
  clear();
  belgium_ = nullptr;

  bool useInternalPath = true;
  insertColumns(0, 4);

  setHeaderData(0, Orientation::Horizontal, std::string("Places"));
  setHeaderData(1, Orientation::Horizontal, std::string("Weather"));
  setHeaderData(2, Orientation::Horizontal, std::string("Drink"));
  setHeaderData(3, Orientation::Horizontal, std::string("Visited"));

  /*
  * ... and data
  */
  std::unique_ptr<WStandardItem> continent, country;
  WStandardItem *continentPtr, *countryPtr;

  continent = continentItem("Europe");
  continentPtr = continent.get();
  this->appendRow(std::move(continent));

  country = countryItem("Belgium", "be");
  countryPtr = country.get();
  continentPtr->appendRow(std::move(country));
  countryPtr->appendRow(cityItems("Brussels", Rain, "Beer", useInternalPath, true));

  countryPtr->appendRow(cityItems("Brussels", Rain, "Beer", useInternalPath, true));
  countryPtr->appendRow(cityItems("Brussels", Rain, "Beer", useInternalPath, true));
  countryPtr->appendRow(cityItems("Brussels", Rain, "Beer", useInternalPath, true));
  countryPtr->appendRow(cityItems("Brussels", Rain, "Beer", useInternalPath, true));
  countryPtr->appendRow(cityItems("Brussels", Rain, "Beer", useInternalPath, true));
  countryPtr->appendRow(cityItems("Brussels", Rain, "Beer", useInternalPath, true));
  countryPtr->appendRow(cityItems("Brussels", Rain, "Beer", useInternalPath, true));
  countryPtr->appendRow(cityItems("Leuven", Rain, "Beer", useInternalPath, true));

  country = countryItem("France", "fr");
  countryPtr = country.get();
  continentPtr->appendRow(std::move(country));
  countryPtr->appendRow(cityItems("Paris", Cloud, "Wine", useInternalPath, true));
  countryPtr->appendRow(cityItems("Bordeaux", SunCloud, "Bordeaux wine", useInternalPath, false));

  country = countryItem("Spain", "sp");
  countryPtr = country.get();
  continentPtr->appendRow(std::move(country));
  countryPtr->appendRow(cityItems("Barcelona", Sun, "Cava", useInternalPath, true));
  countryPtr->appendRow(cityItems("Madrid", Sun, "San Miguel", useInternalPath, false));

  continent = continentItem("Africa");
  continentPtr = continent.get();
  appendRow(std::move(continent));

  country = countryItem("Morocco (المغرب)", "ma");
  countryPtr = country.get();
  continentPtr->appendRow(std::move(country));
  countryPtr->appendRow(cityItems("Casablanca", Sun, "Tea", useInternalPath, false));

  belgium_ = item(0, 0)->child(0, 0);

  return true;
}

std::unique_ptr<WStandardItem> TreeViewModel::continentItem(const std::string& continent)
{
  std::unique_ptr<WStandardItem> result
    = cpp14::make_unique<WStandardItem>(continent);
  result->setColumnCount(4);
  return result;
}

std::unique_ptr<WStandardItem> TreeViewModel::countryItem(const std::string& country, const std::string& code)
{
  std::unique_ptr<WStandardItem> result
    = cpp14::make_unique<WStandardItem>(WString(country));
  result->setIcon("icons/flag_" + code + ".png");
  return result;
}

std::vector<std::unique_ptr<WStandardItem>> TreeViewModel::cityItems(const std::string& city, WeatherIcon weather, const std::string& drink, bool useInternalPath, bool visited)
{
  std::vector<std::unique_ptr<WStandardItem>> result;
  std::unique_ptr<WStandardItem> item;

  // column 0: country
  item = cpp14::make_unique<WStandardItem>(WString(city));
  result.push_back(std::move(item));

  // column 1: weather
  item = cpp14::make_unique<WStandardItem>();
  item->setIcon(std::string("icons/") + weatherIcons[weather]);
  result.push_back(std::move(item));

  // column 2: drink
  item = cpp14::make_unique<WStandardItem>(drink);
  if (useInternalPath)
    item->setLink(WLink(LinkType::InternalPath, "/drinks/" + drink));
  result.push_back(std::move(item));

  // column 3: visited
  item = cpp14::make_unique<WStandardItem>();
  item->setCheckable(true);
  item->setChecked(visited);
  result.push_back(std::move(item));

  return result;
}

void TreeViewModel::toggleRowHeight(WTreeView *treeView_)
{
  if (treeView_->rowHeight() == WLength(31))
    treeView_->setRowHeight(25);
  else
    treeView_->setRowHeight(31);
}

void TreeViewModel::toggleStripes(WTreeView *treeView_)
{
  treeView_->setAlternatingRowColors(!treeView_->alternatingRowColors());
}

void TreeViewModel::toggleRoot(WTreeView *treeView_)
{
  if (treeView_->rootIndex() == WModelIndex())
    treeView_->setRootIndex(this->index(0, 0));
  else
    treeView_->setRootIndex(WModelIndex());
}

void TreeViewModel::addRows(WTreeView *treeView_)
{
  if (nullptr != belgium_)
  {
    int COUNT = 10;

    for (int i = 0; i < COUNT; ++i)
    {
      std::string cityName = "City " + asString(belgium_->rowCount() + 1).toUTF8();
      bool useInternalPath = false;
      belgium_->appendRow(cityItems(cityName, Storm, "Juice", useInternalPath, false));
    }

    treeView_->scrollTo(belgium_->child(belgium_->rowCount() - COUNT)->index(), ScrollHint::PositionAtTop);
  }
}



TreeViewExample::TreeViewExample(const WString& titleText)
{
  model_ = std::make_unique<TreeViewModel>();
  TreeViewModel *pTreeViewModel = dynamic_cast<TreeViewModel*>(model_.get());

  this->addWidget(cpp14::make_unique<WText>(titleText));

  /*
   * Now create the view
   */
  WPanel *panel = this->addWidget(cpp14::make_unique<WPanel>());
  panel->resize(600, 300);

  auto treeView = cpp14::make_unique<WTreeView>();
  treeView_ = treeView.get();
  panel->setCentralWidget(std::move(treeView));
  
  if (!WApplication::instance()->environment().ajax())
    treeView_->resize(WLength::Auto, 290);

  treeView_->setAlternatingRowColors(true);
  treeView_->setRowHeight(25);
  treeView_->setModel(model_);

  treeView_->setColumnWidth(1, WLength(100));
  treeView_->setColumnAlignment(1, AlignmentFlag::Center);
  treeView_->setColumnWidth(3, WLength(100));
  treeView_->setColumnAlignment(3, AlignmentFlag::Center);

  treeView_->setRowHeaderCount(1);
  treeView_->setColumnWidth(0, 300);

  /*
   * Expand the first (and single) top level node
   */
  treeView_->setExpanded(model_->index(0, 0), true);
  treeView_->setExpanded(model_->index(0, 0, model_->index(0, 0)), true);

  treeView_->setSortingEnabled(false);
  treeView_->setSortingEnabled(0, true);
  treeView_->setSortingEnabled(2, true);

  /*
   * Setup some buttons to manipulate the view and the model.
   */
  WContainerWidget *wc = this->addWidget(cpp14::make_unique<WContainerWidget>());
  WPushButton *b;

  b = wc->addWidget(cpp14::make_unique<WPushButton>("Toggle row height"));
  b->clicked().connect([=] { pTreeViewModel->toggleRowHeight(treeView_); });
  b->setToolTip("Toggles row height between 31px and 25px");
  
  b = wc->addWidget(cpp14::make_unique<WPushButton>("Toggle stripes"));
  b->clicked().connect([=] { pTreeViewModel->toggleStripes(treeView_); });
  b->setToolTip("Toggle alternating row colors");
  
  b = wc->addWidget(cpp14::make_unique<WPushButton>("Toggle root"));
  b->clicked().connect([=] { pTreeViewModel->toggleRoot(treeView_); });
  b->setToolTip("Toggles root item between all and the first continent.");

  b = wc->addWidget(cpp14::make_unique<WPushButton>("Add rows"));
  b->clicked().connect([=]{ pTreeViewModel->addRows(treeView_); });
  b->setToolTip("Adds some cities to Belgium");
}

bool TreeViewExample::update()
{
  bool bReturn = false;

  if (nullptr != treeView_)
  {
    TreeViewModel *pModel = dynamic_cast<TreeViewModel*>(treeView_->model().get());
    if (nullptr != pModel) bReturn = pModel->update();
  }

  return bReturn;
}