#include "mainwindow.h"
#include "ui_mainwindow.h"

#include "boltdb.h"

#include <QFileDialog>
#include <QMessageBox>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    on_bucketTree_currentItemChanged(nullptr, nullptr);

    databaseContext = new QMenu();
    databaseContext->addAction(ui->actionRefresh_buckets);
    databaseContext->addAction(ui->actionDisconnect);

    bucketContext = new QMenu();
    bucketContext->addAction(ui->actionDelete_bucket);
}

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

static const int BdbPointerRole = Qt::UserRole + 1;
#define SET_BDB(top, bdb) top->setData(0, BdbPointerRole, QVariant::fromValue<void*>(static_cast<void*>(bdb)))
#define GET_BDB(top) static_cast<BoltDB*>( top->data(0, BdbPointerRole).value<void*>() )

/*
static BoltDB* GET_BDB(QTreeWidgetItem *top) {
    while(top->parent() != nullptr) {
        top = top->parent();
    }

    return static_cast<BoltDB*>( top->data(0, BdbPointerRole).value<void*>() );
}
*/

void MainWindow::on_actionOpen_database_triggered()
{
    QString file = QFileDialog::getOpenFileName(this, tr("Select bolt database..."));
    if (! file.length()) {
        return;
    }

    // Open
    QString error;
    auto *bdb = BoltDB::createFrom(file, error);
    if (bdb == nullptr) {
        QMessageBox qmb;
        qmb.setText(tr("Error opening database: %1").arg(error));
        qmb.exec();
        return;
    }

    QTreeWidgetItem *top = new QTreeWidgetItem();
    top->setText(0, QFileInfo(file).fileName());
    top->setIcon(0, QIcon(":/rsrc/database.png"));
    SET_BDB(top, bdb);
    ui->bucketTree->addTopLevelItem(top);

    refreshBucketTree(top);
    ui->bucketTree->setCurrentItem(top);
}

void MainWindow::refreshBucketTree(QTreeWidgetItem* itm)
{
    // ui->bucketTree->clearSelection();
    QTreeWidgetItem *top = itm;
    QStringList browsePath;
    while(top->parent() != nullptr) {
        browsePath.push_front(top->text(0));
        top = top->parent();
    }

    // Remove existing children
    for (int i = itm->childCount(); i --> 0;) {
        delete itm->takeChild(i);
    }

    if (browsePath.size() > 1) {
        return; // only go one level deep
    }

    auto *bdb = GET_BDB(top);

    QString error;
    bool ok = bdb->listBuckets(
        browsePath,
        error,
        [=](QByteArray qba){
            QTreeWidgetItem *child = new QTreeWidgetItem();
            child->setText(0, QString::fromUtf8(qba));
            child->setIcon(0, QIcon(":/rsrc/table.png"));
            itm->addChild(child);

            refreshBucketTree(child);
        }
    );

    if (!ok) {
        QMessageBox qmb;
        qmb.setText(tr("Error listing buckets: %1").arg(error));
        qmb.exec();
        // (continue)
    }
}

void MainWindow::on_actionExit_triggered()
{
    close();
}

void MainWindow::on_actionAbout_Qt_triggered()
{
    QApplication::aboutQt();
}

void MainWindow::on_actionAbout_qbolt_triggered()
{
    QMessageBox::about(
        this,
        QApplication::applicationDisplayName(),
        "<b>QBolt</b><br>Graphical interface for managing Bolt databases<br><br>"
        "- <a href='https://github.com/boltdb/bolt'>About BoltDB</a><br>"
        "- <a href='http://www.famfamfam.com/lab/icons/silk/'>FamFamFam &quot;Silk&quot; icon set</a><br>"
        "- <a href='https://code.ivysaur.me/qbolt'>QBolt homepage</a><br>"
    );
}

void MainWindow::on_actionDisconnect_triggered()
{
    QTreeWidgetItem *top = lastContextSelection;
    if (top->parent()) {
        return; // somehow we didn't select a top-level item
    }

    auto *bdb = GET_BDB(top);

    // Remove UI
    ui->bucketTree->clearSelection();
    delete top;

    // Disconnect from DB
    delete bdb;
}

void MainWindow::on_bucketTree_customContextMenuRequested(const QPoint &pos)
{
    auto *itm = ui->bucketTree->itemAt(pos);
    if (itm == nullptr) {
        return;
    }

    lastContextSelection = itm;

    if (itm->parent() != nullptr) {
        // Child item, show the bucket menu
        bucketContext->popup(ui->bucketTree->mapToGlobal(pos));

    } else {
        // Top-level item, show the database menu
        databaseContext->popup(ui->bucketTree->mapToGlobal(pos));
    }
}

void MainWindow::on_actionRefresh_buckets_triggered()
{

}

void MainWindow::on_bucketTree_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous)
{
    Q_UNUSED(previous);
    if (current == nullptr) {
        ui->stackedWidget->setVisible(false);
        return;
    }

    ui->stackedWidget->setVisible(true);

    if (current->parent() == nullptr) {
        // Selected a database
        ui->stackedWidget->setCurrentWidget(ui->databasePage);

        auto *bdb = GET_BDB(current);
        bdb->getStatsJSON(
            [=](QString j) {
                ui->databasePropertiesArea->clear();
                ui->databasePropertiesArea->setPlainText(j);
            },
            [=](QString error) {
                QMessageBox qmb;
                qmb.setText(tr("Error retrieving database statistics: %1").arg(error));
                qmb.exec();
            }
        );

    } else {
        // Selected a bucket

        ui->stackedWidget->setCurrentWidget(ui->bucketPage);

        QStringList browse;
        QTreeWidgetItem *top = current;
        while (top->parent() != nullptr) {
            browse.push_front(top->text(0));
            top = top->parent();
        }
        auto *bdb = GET_BDB(top);

        bdb->getBucketStatsJSON(
            browse,
            [=](QString j) {
                ui->bucketPropertiesArea->clear();
                ui->bucketPropertiesArea->setPlainText(j);
            },
            [=](QString error) {
                QMessageBox qmb;
                qmb.setText(tr("Error retrieving bucket statistics: %1").arg(error));
                qmb.exec();
            }
        );

        // Load the data tab
        // TODO
    }
}

void MainWindow::on_actionClear_selection_triggered()
{
    ui->bucketTree->setCurrentItem(nullptr);
}