#include "DatabaseWindow.h"
#include "util.h"
#include "CrudTab.h"
#include "widgets/CatalogTablesPage.h"
#include "OpenDatabase.h"
#include "catalog/PgDatabaseCatalog.h"
#include "ConnectionController.h"
#include "MasterController.h"
#include "TaskExecutor.h"
#include <QAction>
#include <QApplication>
#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.h"
#include <serverinspector/ServerInspector.h>

namespace pg = Pgsql;





DatabaseWindow::DatabaseWindow(MasterController *master, QWidget *parent)
	: QMainWindow(parent)
	, m_masterController(master)
{
	connect(&loadWatcher, &QFutureWatcher<LoadCatalog::Result>::finished,
			this, &DatabaseWindow::catalogLoaded);

	m_tabWidget = new QTabWidget(this);
	m_tabWidget->setObjectName("m_tabWidget");
	setCentralWidget(m_tabWidget);

	createActions();
	initMenus();

	QMetaObject::connectSlotsByName(this);

    setAcceptDrops(true);
}

DatabaseWindow::~DatabaseWindow() = default;

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

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

void DatabaseWindow::setTabIcon(QWidget *widget, const QString &iconname)
{
	auto index = m_tabWidget->indexOf(widget);
	auto n = ":/icons/16x16/" + iconname;
	m_tabWidget->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 = m_tabWidget->currentWidget();
	auto qt = dynamic_cast<QueryTool*>(widget);
	return qt;
}

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

void DatabaseWindow::closeEvent(QCloseEvent *event)
{
	for (int idx = 0; idx < m_tabWidget->count(); ++idx) {
		auto widget = m_tabWidget->widget(idx);
		auto mp = dynamic_cast<ManagedPage*>(widget);
		if (mp) {
			if (!mp->CanClose(true)) {
				event->ignore();
				return;
			}
		}
	}
}

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

		auto f = TaskExecutor::run(new LoadCatalog(m_config));
		loadWatcher.setFuture(f);

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

		close();
	}
}


void DatabaseWindow::createActions()
{
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/about.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionAbout = new QAction(icon, tr("About"), this);
		action->setObjectName("actionAbout");
	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/script_delete.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionCancelQuery = new QAction(icon, tr("Cancel query"), this);
		action->setObjectName("actionCancelQuery");
	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/page_white_delete.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionClose = new QAction(icon, tr("Close"), this);
		action->setObjectName("actionClose");
        action->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_W));
	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/page_white_copy.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionCopy = new QAction(icon, tr("Copy"), this);
		action->setObjectName("actionCopy");
        action->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_C));
	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/token_shortland_character.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionCopyAsCString = new QAction(icon, tr("Copy as C string"), this);
		action->setObjectName("actionCopyAsCString");
        action->setShortcut(QKeySequence(Qt::CTRL | Qt::SHIFT | Qt::Key_C));
	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/token_shortland_character.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionCopyAsRawCppString = new QAction(icon, tr("Copy as raw C++-string"), this);
		action->setObjectName("actionCopyAsRawCppString");

	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/script_go.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionExecuteQuery = new QAction(icon, tr("Execute query"), this);
		action->setObjectName("actionExecuteQuery");
		action->setShortcut(QKeySequence(Qt::Key_F5));
		action->setShortcutContext(Qt::WidgetWithChildrenShortcut);
	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/lightbulb_off.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionExplain = new QAction(icon, tr("Explain"), this);
		action->setObjectName("actionExplain");
		action->setShortcut(QKeySequence(Qt::Key_F7));
	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/lightbulb.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionExplainAnalyze = new QAction(icon, tr("Explain analyze"), this);
		action->setObjectName("actionExplainAnalyze");
        action->setShortcut(QKeySequence(Qt::SHIFT | Qt::Key_F7));
	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/table_save.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionExportData = new QAction(icon, tr("Export data"), this);
		action->setObjectName("actionExportData");
	}
	{
		auto action = actionGenerateCode = new QAction(tr("Generate code"), this);
		action->setObjectName("actionGenerateCode");
	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/page_white_add.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionInspectInformationSchema = new QAction(icon, tr("Inspect information_schema"), this);
		action->setObjectName("actionInspectInformationSchema");
	}
    {
        QIcon icon;
        icon.addFile(QString::fromUtf8(":/icons/page_white_add.png"), QSize(), QIcon::Normal, QIcon::On);
        auto action = actionServerInspector = new QAction(icon, tr("Inspect server"), this);
        action->setObjectName("actionServerInspector");
    }
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/page_white_add.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionInspectPgCatalog = new QAction(icon, tr("Inspect pg_catalog"), this);
		action->setObjectName("actionInspectPgCatalog");
	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/page_white_add.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionInspectUserSchemas = new QAction(icon, tr("Inspect user schemas"), this);
		action->setObjectName("actionInspectUserSchemas");
	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/new_query_tab.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionNewSql = new QAction(icon, tr("New Query"), this);
		action->setObjectName("actionNewSql");
        action->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_N));
	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/folder.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionOpenSql = new QAction(icon, tr("Open Query"), this);
		action->setObjectName("actionOpenSql");
        action->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_O));
	}
	{
		QIcon icon;
		//icon.addFile(QString::fromUtf8(":/icons/folder.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionPasteLangString = new QAction(icon, tr("Paste lang string"), this);
		action->setObjectName("actionPasteLangString");
        action->setShortcut(QKeySequence(Qt::CTRL | Qt::SHIFT | Qt::Key_V));
	}
	{
		QIcon icon;
		auto action = actionRefreshCatalog = new QAction(icon, tr("Refresh"), this);
		action->setShortcut(QKeySequence(Qt::Key_F5));
		action->setShortcutContext(Qt::WidgetWithChildrenShortcut);
		action->setObjectName("actionRefreshCatalog");
	}
	{
		auto action = actionRefreshCrud = new QAction(QIcon(), tr("Refresh"), this);
		action->setShortcut(QKeySequence(Qt::Key_F5));
		action->setShortcutContext(Qt::WidgetWithChildrenShortcut);
		action->setObjectName("actionRefreshCrud");
	}
	{
		QIcon icon;
		icon.addFile(QString::fromUtf8(":/icons/script_save.png"), QSize(), QIcon::Normal, QIcon::On);
		auto action = actionSaveSql = new QAction(icon, tr("Save query"), this);
		action->setObjectName("actionSaveSql");
        action->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_S));
	}
	{
		auto action = actionSaveSqlAs = new QAction(tr("Save query as"), this);
		action->setObjectName("actionSaveSqlAs");
	}
	{
		auto action = actionSaveCopyOfSqlAs = new QAction(tr("Save copy of query as"), this);
		action->setObjectName("actionSaveCopyOfSqlAs");
	}
	{
		auto action = actionShowConnectionManager = new QAction(tr("Show connection manager"), this);
		action->setObjectName("actionShowConnectionManager");
	}
}


void DatabaseWindow::initMenus()
{
	auto mb = new QMenuBar(this);
	menuFile = mb->addMenu(tr("File"));
	menuFile->addActions({
							 actionNewSql,
							 actionOpenSql,
							 seperator(),
							 actionSaveSql,
							 actionSaveSqlAs,
							 actionSaveCopyOfSqlAs,
							 seperator(),
							 actionExportData,
							 seperator(),
							 actionClose
						 });

	menuEdit = mb->addMenu(tr("Edit"));
	menuEdit->addActions({
							 actionCopy,
							 actionCopyAsCString,
							 actionCopyAsRawCppString,
							 // standard Paste missing Ctrl+V works however by default
							 actionPasteLangString,
							 actionGenerateCode
						 });

	menuQuery = mb->addMenu(tr("Query"));
	menuQuery->addActions({
							  actionExecuteQuery,
							  actionExplain,
							  actionExplainAnalyze,
							  actionCancelQuery
						  });

	menuCatalog = mb->addMenu(tr("Catalog"));
	menuCatalog->addActions({
							  actionRefreshCatalog
						  });

	menuCrud = mb->addMenu(tr("CRUD"));
	menuCrud->addActions({
							 actionRefreshCrud
						  });

	menuWindow = mb->addMenu(tr("Window"));
	menuWindow->addActions({
							   actionInspectUserSchemas,
							   actionInspectPgCatalog,
							   actionInspectInformationSchema,
                               actionServerInspector,
							   seperator(),
							   actionShowConnectionManager
						   });


	menuHelp = mb->addMenu(tr("Help"));
	menuHelp->addActions({
							 seperator(),
							 actionAbout
						 });

	setMenuBar(mb);
}

QAction *DatabaseWindow::seperator()
{
	auto ac = new QAction(this);
	ac->setSeparator(true);
	return ac;
}

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

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

void DatabaseWindow::newCatalogInspectorPage(QString caption, NamespaceFilter filter)
{
	auto ct = new CatalogInspector(m_database, this);
	ct->addAction(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))
		m_tabWidget->removeTab(index);
}

bool DatabaseWindow::canCloseTab(int index) const
{
    QWidget *widget = m_tabWidget->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(actionExecuteQuery);
            addPage(ct, ct->title());
        }
        else {
            delete ct;
        }
    }

}

void DatabaseWindow::catalogLoaded()
{
    try	{
        m_database = loadWatcher.future().result();

        //		for (auto f : { "user", "pg_catalog", "information_schema" }) {
        //			// TODO open inspector windows
        //		}
        //		newCreateTablePage();
        on_actionNewSql_triggered();
    } catch (const OpenDatabaseException &ex) {
        QMessageBox::critical(this, "Error reading database", ex.text());
        close();
    }
}

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


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_actionCancelQuery_triggered()
{
	auto query_tool = GetActiveQueryTool();
	if (query_tool) {
		query_tool->cancel();
	}
}

void DatabaseWindow::on_actionClose_triggered()
{
	m_tabWidget->tabCloseRequested(m_tabWidget->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::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::on_actionCopyAsCString_triggered()
{
	auto query_tool = GetActiveQueryTool();
    if (query_tool)
		query_tool->copyQueryAsCString();
}

void DatabaseWindow::on_actionCopyAsRawCppString_triggered()
{
	auto query_tool = GetActiveQueryTool();
    if (query_tool)
		query_tool->copyQueryAsRawCppString();
}

void DatabaseWindow::on_actionExecuteQuery_triggered()
{
	auto query_tool = GetActiveQueryTool();
    if (query_tool)
		query_tool->execute();
}

void DatabaseWindow::on_actionExplain_triggered()
{
	auto query_tool = GetActiveQueryTool();
    if (query_tool)
		query_tool->explain(false);
}

void DatabaseWindow::on_actionExplainAnalyze_triggered()
{
	auto query_tool = GetActiveQueryTool();
    if (query_tool)
		query_tool->explain(true);
}

void DatabaseWindow::on_actionExportData_triggered()
{
	auto query_tool = GetActiveQueryTool();
    if (query_tool)
		query_tool->exportData();
}

void DatabaseWindow::on_actionGenerateCode_triggered()
{
	auto query_tool = GetActiveQueryTool();
    if (query_tool)
		query_tool->generateCode();
}

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

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

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

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

void DatabaseWindow::on_actionNewSql_triggered()
{
	auto *ct = new QueryTool(this, this);
	ct->addAction(actionExecuteQuery);
	addPage(ct, "new");
	ct->newdoc();
}

void DatabaseWindow::on_actionOpenSql_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_actionPasteLangString_triggered()
{
	auto query_tool = GetActiveQueryTool();
    if (query_tool)
		query_tool->pasteLangString();
}

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

void DatabaseWindow::on_actionRefreshCrud_triggered()
{
	auto crud = GetActiveCrud();
    if (crud)
		crud->refresh();
}

void DatabaseWindow::on_actionSaveSql_triggered()
{
	auto query_tool = GetActiveQueryTool();
    if (query_tool)
		query_tool->save();
}

void DatabaseWindow::on_actionSaveSqlAs_triggered()
{
	auto query_tool = GetActiveQueryTool();
    if (query_tool)
		query_tool->saveAs();
}

void DatabaseWindow::on_actionSaveCopyOfSqlAs_triggered()
{
	auto query_tool = GetActiveQueryTool();
    if (query_tool)
		query_tool->saveCopyAs();
}

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

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

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

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

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

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