#include "ui_BrowserWndUi.h"
#include "BrowserWnd.h"
#include "LoginWnd.h"
#include "Query.h"
#include "DataModel.h"
#include "QueryThread.h"

#include <QDebug>
#include <QGraphicsDropShadowEffect>
#include <QListWidgetItem>
#include <QMessageBox>
#include <QRegExp>
#include <QShortcut>
#include <QThread>


BrowserWnd::BrowserWnd()
  : QWidget(nullptr)
  , m_loginWnd(new LoginWnd(this))
  , m_waitWnd(new WaitWnd(this))
  , m_ui(new Ui::BrowserWnd)
  , m_queryWorker(new QueryWorker())
  , m_queryThread(new QThread())
{
  //setVersionView();

  qRegisterMetaType<LoginData>("LoginData");

  if (!test())
    exit(1);

  new QShortcut(QKeySequence(QStringLiteral("Ctrl+Q")), this, SLOT(close()));

  connect(this, &BrowserWnd::signalConnect, m_queryWorker, &QueryWorker::slotConnectIt);
  connect(m_queryWorker, &QueryWorker::signalConnectResult, this, &BrowserWnd::slotConnectResult);

  connect(this, &BrowserWnd::signalGetTableList, m_queryWorker, &QueryWorker::slotGetTableList);
  connect(m_queryWorker, &QueryWorker::signalNewTableList, this, &BrowserWnd::slotNewTableList);

  m_queryWorker->moveToThread(m_queryThread);
  m_queryThread->start();
}

BrowserWnd::~BrowserWnd()
{
  endThread();
  delete m_ui;
  delete m_waitWnd;
  delete m_loginWnd;
}


void BrowserWnd::slotAddNewQuery()
{
  addNewQuery();
}


void BrowserWnd::slotConnectResult(const QString &result)
{
  if (result.isEmpty()) // connection success!
  {
    // everything okay, logged in, go!
    m_ui->setupUi(this);

    // showing Host / DB name in window title
    this->setWindowTitle(QStringLiteral("RDE SQL Browser on Database: ") + m_loginWnd->getLoginData().database);

    m_ui->splitter->setStretchFactor(0, 0); // not stretch for table list
    m_ui->splitter->setStretchFactor(1, 1); // stretch the query widget

    this->show();

    addNewQuery();

    refreshTableList();

    connect(m_ui->leFilter, &QLineEdit::textChanged, this, &BrowserWnd::slotFilterTableList);
    connect(m_ui->lwTables, &QListWidget::itemDoubleClicked, this, &BrowserWnd::slotFilterTableItemChanged);
    connect(m_ui->twQueries, &QTabWidget::tabCloseRequested, this, &BrowserWnd::slotTabCloseRequested);
    connect(m_ui->pbNewQuery, &QPushButton::clicked, this, &BrowserWnd::slotAddNewQuery);
    connect(m_ui->pushButton, &QPushButton::clicked, qApp, &QApplication::quit);
    connect(m_ui->pushButton_2, &QPushButton::clicked, this, &BrowserWnd::slotHeart);
  }
  else // failed with message
  {
    QMessageBox::critical(this,
                          tr("Connection Error"),
                          tr("Cannot connect to specified server."
                             "\nError:"
                             "\n'%1'").arg(result));
  }

  m_waitWnd->hide();
}


void BrowserWnd::slotFilterTableList(const QString &)
{
  refreshTableList();
}


void BrowserWnd::addNewQuery(const QString &tableName) // tableName only set when query from double clicking table list
{
  Query *query = new Query(m_queryWorker);

  connect(query, &Query::signalShowWait, this, &BrowserWnd::slotShowWait);
  connect(query, &Query::signalHideWait, this, &BrowserWnd::slotHideWait);

  int tabIndex = -1;

  if (tableName.length()) // there is a tablename
  {
    query->setTable(tableName);
    tabIndex = m_ui->twQueries->addTab(query, tableName);
  }
  else // no tablename
    tabIndex = m_ui->twQueries->addTab(query, QStringLiteral("Query %1").arg(m_newQueryCounter++));

  m_ui->twQueries->setCurrentIndex(tabIndex);
}

//#warning TODO: reimpl
//void BrowserWnd::slotSelectQueryStatus(int percent)
//{
//  m_waitWnd->setStatus(percent);
//}


void BrowserWnd::endThread()
{
  if (!m_queryThread)
    return;

  m_queryWorker->dy();
  m_queryThread->quit();
  m_queryThread->wait();

  delete m_queryThread;
  m_queryThread = nullptr;
  delete m_queryWorker;
  m_queryWorker = nullptr;
}


void BrowserWnd::refreshTableList()
{
  m_ui->lwTables->clear();

  m_waitWnd->wait(QStringLiteral("Refreshing Table List .."));

  emit signalGetTableList();
}


void BrowserWnd::slotNewTableList(QStringList tables)
{
  if (!m_ui->leFilter->text().isEmpty()) // filter when there is a filter
  {
    QRegExp regExp(m_ui->leFilter->text(), Qt::CaseInsensitive, QRegExp::Wildcard);
    tables = tables.filter(regExp);
  }

  m_ui->lwTables->addItems(tables);

  m_waitWnd->hide();
}


void BrowserWnd::startConnect()
{
  //m_loginWnd->setDefaultLoginData(presetManager.  defaultLoginData);

  if (!m_loginWnd->exec()) // false = user reject
  {
    QCoreApplication::quit();
    return;
  }

  m_waitWnd->wait(tr("Connecting .."));

  emit signalConnect(m_loginWnd->getLoginData());
}


bool BrowserWnd::test()
{
  if (QSqlDatabase::drivers().isEmpty() ||
      QSqlDatabase::drivers().indexOf(QLatin1String("QSQLITE")) == -1)
  {
    QMessageBox::critical(this,
                          tr("Missing Qt PostgreSQL driver"),
                          tr("There is no QPSQL driver."
                             "\nDid you install the package 'libQt5Sql5-postgresql'?"));

    return false;
  }

  return true;
}


void BrowserWnd::slotFilterTableItemChanged(QListWidgetItem *item)
{
  QString tableName = item->text();
  addNewQuery(tableName);
}


void BrowserWnd::slotTabCloseRequested(int index)
{
  Query *q = qobject_cast<Query *>(m_ui->twQueries->widget(index));

  m_ui->twQueries->removeTab(index);

  if (!q)
    QMessageBox::critical(this, QStringLiteral("Query Failed"), QStringLiteral("Woops..?!!"));

  delete q; // It´s safe to delete nullptr;
}


void BrowserWnd::slotShowWait(const QString &msg)
{
  m_waitWnd->wait(msg);
}


void BrowserWnd::slotHideWait()
{
  m_waitWnd->hide();
}


void BrowserWnd::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();
}