#include "DatabaseWindow.h"
#include "util.h"
#include "OpenDatabase.h"
#include "MasterController.h"
#include "TaskExecutor.h"
#include <QAction>
#include <QApplication>
#include <QFileDialog>
#include <QMenuBar>
#include <QMessageBox>
#include <QMetaMethod>
#include <QStandardPaths>
#include <QTableView>

#include "EditTableWidget.h"
#include "CatalogInspector.h"
#include "CodeGenerator.h"
#include "QueryTool.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);
	setCentralWidget(m_tabWidget);

	createActions();
	initMenus();

	QMetaObject::connectSlotsByName(this);
}

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

void DatabaseWindow::newCodeGenPage(QString query, std::shared_ptr<const Pgsql::Result> dbres)
{
	// TODO should this call be this direct or should it go through module system
	// yes it should otherwise context cannot properly setup toolbar and menu!!!
//	auto cgtab = new CodeGenerator(context(), pluginModule(), 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;
}

void DatabaseWindow::setConfig(const ConnectionConfig &config)
{
	m_config = config;
	try	{
		QString title = "pglab - ";
		title += m_config.name().c_str();
		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/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::ALT + 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");
		action->setShortcut(QKeySequence(Qt::CTRL + Qt::ALT + Qt::Key_C));
	}
	{
		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 = 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/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,
							 actionGenerateCode
						 });

	menuWindow = mb->addMenu(tr("Window"));
	menuWindow->addActions({
							   actionInspectUserSchemas,
							   actionInspectPgCatalog,
							   actionInspectInformationSchema,
							   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::catalogLoaded()
{
	try	{
		m_database = loadWatcher.future().result();

		for (auto f : { "user", "pg_catalog", "information_schema" }) {
			// TODO open inspector windows
		}


		newCreateTablePage();
	} catch (const OpenDatabaseException &ex) {
		QMessageBox::critical(this, "Error reading database", ex.text());
		close();
	}
}


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_actionCopy_triggered()
{
	QWidget *w = QApplication::focusWidget();
	QTableView *tv = dynamic_cast<QTableView*>(w);
	if (tv) {
		copySelectionToClipboard(tv);
	}
	else {
		const QMetaObject *meta = w->metaObject();
		int i = meta->indexOfSlot("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_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_actionClose_triggered()
{
	m_tabWidget->tabCloseRequested(m_tabWidget->currentIndex());
}

void DatabaseWindow::on_actionInspectInformationSchema_triggered()
{
	auto ct = new CatalogInspector(m_database, this);
	addPage(ct, "information_schema");
	ct->setNamespaceFilter(NamespaceFilter::InformationSchema);
}

void DatabaseWindow::on_actionInspectPgCatalog_triggered()
{
	auto ct = new CatalogInspector(m_database, this);
	addPage(ct, "pg_catalog");
	ct->setNamespaceFilter(NamespaceFilter::PgCatalog);
}

void DatabaseWindow::on_actionInspectUserSchemas_triggered()
{
	auto ct = new CatalogInspector(m_database, this);
	addPage(ct, "Schema");
	ct->setNamespaceFilter(NamespaceFilter::User);
}

void DatabaseWindow::on_actionNewSql_triggered()
{
	auto *ct = new QueryTool(m_database, this);
	addPage(ct, "query");
	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)"));
	if ( ! file_name.isEmpty()) {
		auto *ct = new QueryTool(m_database, this);
		if (ct->load(file_name)) {
			addPage(ct, "");
		}
		else {
			delete ct;
		}
	}
}

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->showConnectionManager();
}