#include "LoginWnd.h"
#include "ui_LoginUi.h"

#include <QGraphicsDropShadowEffect>
#include <QFileDialog>
#include <QDebug>
#include <QSqlDatabase>


LoginWnd::LoginWnd(QWidget *parent)
  : QDialog(parent)
  , m_ui(new Ui::LoginWnd)
{
  m_ui->setupUi(this);

  connect(m_ui->pbHeart, &QPushButton::clicked,
          this, &LoginWnd::slotHeart);

  // SQLite:
  connect(m_ui->pbLoadFile, &QPushButton::clicked, this, &LoginWnd::slotLoadFile);
  connect(m_ui->tbChooseFile, &QToolButton::clicked, this, &LoginWnd::slotChooseFile);
  connect(m_ui->pbExit_2, &QPushButton::clicked, this, &LoginWnd::reject);

  // DBMS:
  connect(m_ui->pbLogin, &QPushButton::clicked, this, &LoginWnd::accept);
  connect(m_ui->pbExit, &QPushButton::clicked, this, &LoginWnd::reject);

  // Common:
  connect(m_ui->pbLoad, &QPushButton::clicked, this, &LoginWnd::slotLoadPreset);
  connect(m_ui->pbSave, &QPushButton::clicked, this, &LoginWnd::slotSavePreset);

  fillPresetComboBox();


  // set typical values
  m_ui->leDatabase->setText(QStringLiteral("lts_ets_pro"));
  m_ui->leUsername->setText(QStringLiteral("ets_exm"));

  m_ui->leHostname->setPlaceholderText(QStringLiteral("on-site: try 'EXCDBS01'"));

  m_ui->cbDriver->addItems(QSqlDatabase::drivers());
  const int idx = m_ui->cbDriver->findText(QStringLiteral("QPSQL"));
  if (idx >= 0)
    m_ui->cbDriver->setCurrentIndex(idx);
}

LoginWnd::~LoginWnd()
{
  delete m_ui;
}


void LoginWnd::slotLoadFile()
{
  if (m_ui->leFilename->text().isEmpty())
    return;

  accept(); // just to make clear that the user cannot login to a database, so he has to click explicitly on "Load File"
}


void LoginWnd::slotChooseFile()
{
  QString fileName = QFileDialog::getOpenFileName(this, tr("Select File-based Database"),
                                                  QString(), // last wd
                                                  tr("All Files (*.*)"));

  if (fileName.isEmpty())
    return;

  m_ui->leFilename->setText(fileName);
}


void LoginWnd::fillPresetComboBox()
{
  m_ui->cbPresets->clear();

  const PresetManager::PresetList &presetList = presetManager.getPresetList();

  for (const Preset &preset : qAsConst(presetList))
    m_ui->cbPresets->addItem(preset.name);

  if (!presetList.isEmpty())
  {
    setDefaultLoginData(presetList.first().loginData);
    m_ui->cbPresets->setCurrentIndex(0);
  }
}


void LoginWnd::slotLoadPreset()
{
  setDefaultLoginData(presetManager.getPresetList().at(m_ui->cbPresets->currentIndex()).loginData);
}

void LoginWnd::slotSavePreset()
{
  presetManager.savePreset(getLoginData(), this);

  fillPresetComboBox();
  setDefaultLoginData(presetManager.getPresetList().at(m_ui->cbPresets->count()-1).loginData); // set default to last (new) preset
  m_ui->cbPresets->setCurrentIndex(m_ui->cbPresets->count()-1); // set index to last (new) preset
}


void LoginWnd::setDefaultLoginData(const LoginData &defaultLoginData)
{
  if (!defaultLoginData.filename.isEmpty()) // no username, etc needed if that's a file
  {
    m_ui->leFilename->setText(defaultLoginData.filename);
    m_ui->leDatabase->setText(QString());
    m_ui->leUsername->setText(QString());
    m_ui->lePassword->setText(QString());
    m_ui->leHostname->setText(QString());
    m_ui->sbPort->setValue(-1);
  }
  else
  {
    m_ui->leFilename->setText(QString());
    m_ui->leDatabase->setText(defaultLoginData.database);
    m_ui->leUsername->setText(defaultLoginData.username);
    m_ui->lePassword->setText(defaultLoginData.password);
    m_ui->leHostname->setText(defaultLoginData.hostname);
    m_ui->cbDriver->setCurrentIndex(m_ui->cbDriver->findText(defaultLoginData.driver));
    m_ui->sbPort->setValue(defaultLoginData.port);
  }
}


LoginData LoginWnd::getLoginData() const
{
  LoginData ld;

  ld.driver   = m_ui->cbDriver->currentText();
  ld.database = m_ui->leDatabase->text();
  ld.username = m_ui->leUsername->text();
  ld.password = m_ui->lePassword->text();
  ld.hostname = m_ui->leHostname->text();
  ld.port     = m_ui->sbPort->value();
  ld.filename = m_ui->leFilename->text();

  return ld;
}

void LoginWnd::slotHeart()
{
  QWidget* w = new QWidget;
  w->setAttribute(Qt::WA_DeleteOnClose); // delete when closed
  QVBoxLayout* b = new QVBoxLayout;
  QLabel* l = new QLabel(QStringLiteral("<html><body>Geschmiedet mit %1 , ohne Kostenträger, für das Team.<br>Diese Software wurde in meiner Freizeit entwickelt, bitte habt Verständnis für Bugs und Geduld für Fixes. Danke! - Euer Mike Wille, SLSE 2016, 17</body></html>").arg(QChar(0x2764)));
  QGraphicsDropShadowEffect *shadow = new QGraphicsDropShadowEffect;
  shadow->setOffset(0,0);
  shadow->setBlurRadius(22);
  shadow->setColor(QColor("blue"));
  l->setGraphicsEffect(shadow);
  b->addWidget(l);
  w->setLayout(b);

  w->show();
}