#include "DatabaseWindow.h"
#include "ui_DatabaseWindow.h"
#include "util.h"
#include "crud/CrudTab.h"
#include "catalog/widgets/CatalogTablesPage.h"
#include "OpenDatabase.h"
#include "catalog/PgDatabaseCatalog.h"
#include "ConnectionController.h"
#include "MasterController.h"
#include <QAction>
#include <QApplication>
#include <QtConcurrent>
#include <QCloseEvent>
#include <QFileDialog>
#include <QMenuBar>
#include <QMessageBox>
#include <QMetaMethod>
#include <QMimeData>
#include <QStandardPaths>
#include <QStatusBar>
#include <QTableView>

#include "EditTableWidget.h"
#include "CodeGenerator.h"
#include "querytool/QueryTool.h"
#include <serverinspector/ServerInspector.h>

namespace pg = Pgsql;

DatabaseWindow::DatabaseWindow(MasterController *master, QWidget *parent)
	: QMainWindow(parent)
    , ui(new Ui::DatabaseWindow)
	, m_masterController(master)
{
    ui->setupUi(this);

    connect(ui->mainTabs, &QTabWidget::tabCloseRequested, this, &DatabaseWindow::mainTabCloseRequested);
    connect(ui->mainTabs, &QTabWidget::currentChanged, this, &DatabaseWindow::currentMainTabChanged);

    setAcceptDrops(true);
}

DatabaseWindow::~DatabaseWindow()
{
    delete ui;
}

void DatabaseWindow::addPage(QWidget* page, QString caption)
{
    ui->mainTabs->addTab(page, caption);
    ui->mainTabs->setCurrentWidget(page);
}

void DatabaseWindow::setTabCaptionForWidget(QWidget *widget, const QString &caption, const QString &hint)
{
    auto index = ui->mainTabs->indexOf(widget);
    ui->mainTabs->setTabText(index, caption);
    ui->mainTabs->setTabToolTip(index, hint);
}

void DatabaseWindow::setTabIcon(QWidget *widget, const QString &iconname)
{
    auto index = ui->mainTabs->indexOf(widget);
	auto n = ":/icons/16x16/" + iconname;
    ui->mainTabs->setTabIcon(index, QIcon(n));
}

void DatabaseWindow::newCodeGenPage(QString query, std::shared_ptr<const Pgsql::Result> dbres)
{
	auto cgtab = new CodeGenerator(this);
	cgtab->Init(m_database->catalog(), query, dbres);
	addPage(cgtab, "Codegen");
}

QueryTool *DatabaseWindow::GetActiveQueryTool()
{
    auto widget = ui->mainTabs->currentWidget();
	auto qt = dynamic_cast<QueryTool*>(widget);
	return qt;
}

CrudTab *DatabaseWindow::GetActiveCrud()
{
    auto widget = ui->mainTabs->currentWidget();
	auto ct = dynamic_cast<CrudTab*>(widget);
	return ct;
}

void DatabaseWindow::closeEvent(QCloseEvent *event)
{
    for (int idx = 0; idx < ui->mainTabs->count(); ++idx)
    {
        if (!canCloseTab(idx))
        {
            event->ignore();
            return;
        }
	}
}

void DatabaseWindow::setConfig(const ConnectionConfig &config)
{
	m_config = config;
    try
    {
		QString title = "pglab - ";
		title += m_config.name();
		setWindowTitle(title);

        auto cfg = m_config;
        auto qthis = QPointer(this);
        QtConcurrent::run([cfg]
            {
                return OpenDatabase::createOpenDatabase(cfg);
            }
        ).then(qApp, [qthis](OpenDatabase::OpenDatabaseSPtr db)
            {
                if (qthis)
                    qthis.data()->catalogLoaded(db);
            }
        );

    }
    catch (std::runtime_error &ex)
    {
		QMessageBox::critical(this, "Error reading database",
							  QString::fromUtf8(ex.what()));
		close();
	}
}

void DatabaseWindow::newCreateTablePage()
{
	auto w = new EditTableWidget(m_database, this);
    ui->mainTabs->addTab(w, "Create table");
}

void DatabaseWindow::newCrudPage(Oid tableoid)
{
	CrudTab *ct = new CrudTab(this, this);
    ct->addAction(ui->actionRefreshCrud);
	addPage(ct, "crud");
	ct->setConfig(tableoid);
}

void DatabaseWindow::newCatalogInspectorPage(QString caption, NamespaceFilter filter)
{
    if (!m_database)
        return; // would be better if we queued the operation for later

    auto ct = new CatalogInspector(m_database, this);
    ct->addAction(ui->actionRefreshCatalog);

	addPage(ct, caption);
	ct->setNamespaceFilter(filter);

    connect(ct->tablesPage(), &CatalogTablesPage::tableSelected, this, &DatabaseWindow::tableSelected);
}

void DatabaseWindow::newServerInspectorPage()
{
    auto si = new ServerInspector(m_database, this);
    addPage(si, tr("Server"));
}

void DatabaseWindow::closeTab(int index)
{
    if (index < 0)
        return;

    if (canCloseTab(index))
    {
        QWidget *widget = ui->mainTabs->widget(index);
        ui->mainTabs->removeTab(index);
        delete widget;
    }
}

bool DatabaseWindow::canCloseTab(int index) const
{
    QWidget *widget = ui->mainTabs->widget(index);
    auto mp = dynamic_cast<ManagedPage*>(widget);
    if (mp)
        return mp->CanClose(true);

    return true;
}

void DatabaseWindow::openSqlFile(QString file_name)
{
    if (!file_name.isEmpty())
    {
        auto *ct = new QueryTool(this, this);
        if (ct->load(file_name))
        {
            ct->addAction(ui->actionExecute_query);
            addPage(ct, ct->title());
        }
        else
            delete ct;
    }
}

void DatabaseWindow::catalogLoaded(OpenDatabase::OpenDatabaseSPtr db)
{
    try
    {
        m_database = db;
        on_actionNew_Query_triggered();
    }
    catch (const OpenDatabaseException &ex)
    {
        QMessageBox::critical(this, "Error reading database", ex.text());
        close();
    }
}

void DatabaseWindow::tableSelected(Oid tableoid)
{
	newCrudPage(tableoid);
}

void DatabaseWindow::InvokeCopyIfPresent(QWidget *w)
{
    const QMetaObject *meta = w->metaObject();
    int i = meta->indexOfMethod("copy()");
    if (i != -1)
    {
        QMetaMethod method = meta->method(i);
        method.invoke(w, Qt::AutoConnection);
    }
}

void DatabaseWindow::mainTabCloseRequested(int index)
{
	closeTab(index);
}

void DatabaseWindow::currentMainTabChanged(int)
{
    auto widget = ui->mainTabs->currentWidget();
	auto qt = dynamic_cast<QueryTool*>(widget);
	auto ct = dynamic_cast<CrudTab*>(widget);
	auto ci = dynamic_cast<CatalogInspector*>(widget);

    ui->menuQuery->menuAction()->setVisible(qt != nullptr);
    ui->menuCatalog->menuAction()->setVisible(ci != nullptr);
    ui->menuCRUD->menuAction()->setVisible(ct != nullptr);
}

void DatabaseWindow::setTitleForWidget(QWidget *widget, QString title, QString hint)
{
    int i = ui->mainTabs->indexOf(widget);
    if (i >= 0)
    {
        ui->mainTabs->setTabText(i, title);
        ui->mainTabs->setTabToolTip(i, hint);
	}
}

void DatabaseWindow::setIconForWidget(QWidget *widget, QIcon icon)
{
    int i = ui->mainTabs->indexOf(widget);
    if (i >= 0)
        ui->mainTabs->setTabIcon(i, icon);
}


std::shared_ptr<OpenDatabase> DatabaseWindow::openDatabase()
{
	return m_database;
}


void DatabaseWindow::showStatusBarMessage(QString message)
{
    statusBar()->showMessage(message);
}

void DatabaseWindow::dragEnterEvent(QDragEnterEvent *event)
{
    if (event->mimeData()->hasUrls())
        event->acceptProposedAction();
}

void DatabaseWindow::dropEvent(QDropEvent *event)
{
    foreach (const QUrl &url, event->mimeData()->urls())
    {
        QString file_name = url.toLocalFile();
        qDebug() << "Dropped file:" << file_name;
        openSqlFile(file_name);
    }
}



void DatabaseWindow::on_actionAbout_triggered()
{
    QMessageBox::about(this, "pgLab 0.1", tr(
              "Copyrights 2016-2019, Eelke Klein, All Rights Reserved.\n"
              "\n"
              "The program is provided AS IS with NO WARRANTY OF ANY KIND, "
              "INCLUDING THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS "
              "FOR A PARTICULAR PURPOSE.\n"
              "\n"
              "This program is dynamically linked with Qt 5.12 Copyright (C) 2018 "
              "The Qt Company Ltd. https://www.qt.io/licensing/. \n"
              "\n"
              "Icons by fatcow http://www.fatcow.com/free-icons provided under Creative Commons "
              "attribution 3.0 license."
              ));
}


void DatabaseWindow::on_actionCancel_query_triggered()
{
    CallOnActiveQueryTool(&QueryTool::cancel);
}


void DatabaseWindow::on_actionClose_triggered()
{
    ui->mainTabs->tabCloseRequested(ui->mainTabs->currentIndex());
}


void DatabaseWindow::on_actionCopy_triggered()
{
    QWidget *w = QApplication::focusWidget();
    if (w == nullptr)
        return;

    QTableView *tv = dynamic_cast<QTableView*>(w);
    if (tv)
        copySelectionToClipboard(tv);
    else
        InvokeCopyIfPresent(w);
}


void DatabaseWindow::on_actionCopy_as_C_string_triggered()
{
    CallOnActiveQueryTool(&QueryTool::copyQueryAsCString);
}

void DatabaseWindow::on_actionCopy_as_raw_C_string_triggered()
{
    CallOnActiveQueryTool(&QueryTool::copyQueryAsRawCppString);
}

void DatabaseWindow::on_actionExecute_query_triggered()
{
    CallOnActiveQueryTool(&QueryTool::execute);
}

void DatabaseWindow::on_actionExplain_triggered()
{
    CallOnActiveQueryTool(&QueryTool::explain, false);
}

void DatabaseWindow::on_actionExplain_analyze_triggered()
{
    CallOnActiveQueryTool(&QueryTool::explain, true);
}

void DatabaseWindow::on_actionExport_data_triggered()
{
    CallOnActiveQueryTool(&QueryTool::exportData);
}

void DatabaseWindow::on_actionGenerate_code_triggered()
{
    CallOnActiveQueryTool(&QueryTool::generateCode);
}

void DatabaseWindow::on_actionInspect_information_schema_triggered()
{
    newCatalogInspectorPage("information_schema", NamespaceFilter::InformationSchema);
}

void DatabaseWindow::on_actionInspect_pg_catalog_triggered()
{
    newCatalogInspectorPage("pg_catalog", NamespaceFilter::PgCatalog);
}

void DatabaseWindow::on_actionInspect_user_schemas_triggered()
{
    newCatalogInspectorPage("Schema", NamespaceFilter::User);
}

void DatabaseWindow::on_actionInspect_server_triggered()
{
    newServerInspectorPage();
}

void DatabaseWindow::on_actionNew_Query_triggered()
{
    auto *ct = new QueryTool(this, this);
    ct->addAction(ui->actionExecute_query);
    addPage(ct, "new");
    ct->newdoc();

}

void DatabaseWindow::on_actionOpen_Query_triggered()
{
    QString home_dir = QStandardPaths::locate(QStandardPaths::HomeLocation, "", QStandardPaths::LocateDirectory);
    QString file_name = QFileDialog::getOpenFileName(this,
        tr("Open sql query"), home_dir, tr("SQL files (*.sql *.txt)"));
    openSqlFile(file_name);
}

void DatabaseWindow::on_actionSave_Query_triggered()
{
    CallOnActiveQueryTool(&QueryTool::save);
}

void DatabaseWindow::on_actionPaste_lang_string_triggered()
{
    CallOnActiveQueryTool(&QueryTool::pasteLangString);
}

void DatabaseWindow::on_actionRefreshCatalog_triggered()
{
    m_database->refresh();
}

void DatabaseWindow::on_actionRefreshCrud_triggered()
{
    CallOnActiveCrud(&CrudTab::refresh);
}

void DatabaseWindow::on_actionSave_query_as_triggered()
{
    CallOnActiveQueryTool(&QueryTool::saveAs);
}

void DatabaseWindow::on_actionSave_copy_of_query_as_triggered()
{
    CallOnActiveQueryTool(&QueryTool::saveCopyAs);
}

void DatabaseWindow::on_actionShow_connection_manager_triggered()
{
    m_masterController->connectionController()->showConnectionManager();
}