// Copyright (c) 2011-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#if defined(HAVE_CONFIG_H)
#include <config/bitcoin-config.h>
#endif

#include <qt/addressbookpage.h>
#include <qt/forms/ui_addressbookpage.h>

#include <qt/addresstablemodel.h>
#include <qt/csvmodelwriter.h>
#include <qt/editaddressdialog.h>
#include <qt/guiutil.h>
#include <qt/platformstyle.h>

#include <QIcon>
#include <QMenu>
#include <QMessageBox>
#include <QSortFilterProxyModel>
#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
#include <QRegularExpression>
#else
#include <QRegExp>
#endif

class AddressBookSortFilterProxyModel final : public QSortFilterProxyModel
{
    const QString m_type;

public:
    AddressBookSortFilterProxyModel(const QString& type, QObject* parent)
        : QSortFilterProxyModel(parent)
        , m_type(type)
    {
        setDynamicSortFilter(true);
        setFilterCaseSensitivity(Qt::CaseInsensitive);
        setSortCaseSensitivity(Qt::CaseInsensitive);
    }

protected:
    bool filterAcceptsRow(int row, const QModelIndex& parent) const override
    {
        auto model = sourceModel();
        auto label = model->index(row, AddressTableModel::Label, parent);

        if (model->data(label, AddressTableModel::TypeRole).toString() != m_type) {
            return false;
        }

        auto address = model->index(row, AddressTableModel::Address, parent);

#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
        const auto pattern = filterRegularExpression();
#else
        const auto pattern = filterRegExp();
#endif
        return (model->data(address).toString().contains(pattern) ||
                model->data(label).toString().contains(pattern));
    }
};

AddressBookPage::AddressBookPage(const PlatformStyle *platformStyle, Mode _mode, Tabs _tab, QWidget *parent) :
    QDialog(parent, GUIUtil::dialog_flags),
    ui(new Ui::AddressBookPage),
    model(nullptr),
    mode(_mode),
    tab(_tab)
{
    ui->setupUi(this);

    if (!platformStyle->getImagesOnButtons()) {
        ui->newAddress->setIcon(QIcon());
        ui->copyAddress->setIcon(QIcon());
        ui->deleteAddress->setIcon(QIcon());
        ui->exportButton->setIcon(QIcon());
    } else {
        ui->newAddress->setIcon(platformStyle->SingleColorIcon(":/icons/add"));
        ui->copyAddress->setIcon(platformStyle->SingleColorIcon(":/icons/editcopy"));
        ui->deleteAddress->setIcon(platformStyle->SingleColorIcon(":/icons/remove"));
        ui->exportButton->setIcon(platformStyle->SingleColorIcon(":/icons/export"));
    }

    switch(mode)
    {
    case ForSelection:
        switch(tab)
        {
        case SendingTab: setWindowTitle(tr("Choose the address to send coins to")); break;
        case ReceivingTab: setWindowTitle(tr("Choose the address to receive coins with")); break;
        }
        connect(ui->tableView, &QTableView::doubleClicked, this, &QDialog::accept);
        ui->tableView->setEditTriggers(QAbstractItemView::NoEditTriggers);
        ui->tableView->setFocus();
        ui->closeButton->setText(tr("C&hoose"));
        ui->exportButton->hide();
        break;
    case ForEditing:
        switch(tab)
        {
        case SendingTab: setWindowTitle(tr("Sending addresses")); break;
        case ReceivingTab: setWindowTitle(tr("Receiving addresses")); break;
        }
        break;
    }
    switch(tab)
    {
    case SendingTab:
        ui->labelExplanation->setText(tr("These are your Bitcoin addresses for sending payments. Always check the amount and the receiving address before sending coins."));
        ui->deleteAddress->setVisible(true);
        ui->newAddress->setVisible(true);
        break;
    case ReceivingTab:
        ui->labelExplanation->setText(tr("These are your Bitcoin addresses for receiving payments. Use the 'Create new receiving address' button in the receive tab to create new addresses.\nSigning is only possible with addresses of the type 'legacy'."));
        ui->deleteAddress->setVisible(false);
        ui->newAddress->setVisible(false);
        break;
    }

    // Build context menu
    contextMenu = new QMenu(this);
    contextMenu->addAction(tr("&Copy Address"), this, &AddressBookPage::on_copyAddress_clicked);
    contextMenu->addAction(tr("Copy &Label"), this, &AddressBookPage::onCopyLabelAction);
    contextMenu->addAction(tr("&Edit"), this, &AddressBookPage::onEditAction);

    if (tab == SendingTab) {
        contextMenu->addAction(tr("&Delete"), this, &AddressBookPage::on_deleteAddress_clicked);
    }

    connect(ui->tableView, &QWidget::customContextMenuRequested, this, &AddressBookPage::contextualMenu);
    connect(ui->closeButton, &QPushButton::clicked, this, &QDialog::accept);

    GUIUtil::handleCloseWindowShortcut(this);
}

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

void AddressBookPage::setModel(AddressTableModel *_model)
{
    this->model = _model;
    if(!_model)
        return;

    auto type = tab == ReceivingTab ? AddressTableModel::Receive : AddressTableModel::Send;
    proxyModel = new AddressBookSortFilterProxyModel(type, this);
    proxyModel->setSourceModel(_model);

    connect(ui->searchLineEdit, &QLineEdit::textChanged, proxyModel, &QSortFilterProxyModel::setFilterWildcard);

    ui->tableView->setModel(proxyModel);
    ui->tableView->sortByColumn(0, Qt::AscendingOrder);

    // Set column widths
    ui->tableView->horizontalHeader()->setSectionResizeMode(AddressTableModel::Label, QHeaderView::Stretch);
    ui->tableView->horizontalHeader()->setSectionResizeMode(AddressTableModel::Address, QHeaderView::ResizeToContents);

    connect(ui->tableView->selectionModel(), &QItemSelectionModel::selectionChanged,
        this, &AddressBookPage::selectionChanged);

    // Select row for newly created address
    connect(_model, &AddressTableModel::rowsInserted, this, &AddressBookPage::selectNewAddress);

    selectionChanged();
}

void AddressBookPage::on_copyAddress_clicked()
{
    GUIUtil::copyEntryData(ui->tableView, AddressTableModel::Address);
}

void AddressBookPage::onCopyLabelAction()
{
    GUIUtil::copyEntryData(ui->tableView, AddressTableModel::Label);
}

void AddressBookPage::onEditAction()
{
    if(!model)
        return;

    if(!ui->tableView->selectionModel())
        return;
    QModelIndexList indexes = ui->tableView->selectionModel()->selectedRows();
    if(indexes.isEmpty())
        return;

    auto dlg = new EditAddressDialog(
        tab == SendingTab ?
        EditAddressDialog::EditSendingAddress :
        EditAddressDialog::EditReceivingAddress, this);
    dlg->setModel(model);
    QModelIndex origIndex = proxyModel->mapToSource(indexes.at(0));
    dlg->loadRow(origIndex.row());
    GUIUtil::ShowModalDialogAsynchronously(dlg);
}

void AddressBookPage::on_newAddress_clicked()
{
    if(!model)
        return;

    if (tab == ReceivingTab) {
        return;
    }

    EditAddressDialog dlg(EditAddressDialog::NewSendingAddress, this);
    dlg.setModel(model);
    if(dlg.exec())
    {
        newAddressToSelect = dlg.getAddress();
    }
}

void AddressBookPage::on_deleteAddress_clicked()
{
    QTableView *table = ui->tableView;
    if(!table->selectionModel())
        return;

    QModelIndexList indexes = table->selectionModel()->selectedRows();
    if(!indexes.isEmpty())
    {
        table->model()->removeRow(indexes.at(0).row());
    }
}

void AddressBookPage::selectionChanged()
{
    // Set button states based on selected tab and selection
    QTableView *table = ui->tableView;
    if(!table->selectionModel())
        return;

    if(table->selectionModel()->hasSelection())
    {
        switch(tab)
        {
        case SendingTab:
            // In sending tab, allow deletion of selection
            ui->deleteAddress->setEnabled(true);
            ui->deleteAddress->setVisible(true);
            break;
        case ReceivingTab:
            // Deleting receiving addresses, however, is not allowed
            ui->deleteAddress->setEnabled(false);
            ui->deleteAddress->setVisible(false);
            break;
        }
        ui->copyAddress->setEnabled(true);
    }
    else
    {
        ui->deleteAddress->setEnabled(false);
        ui->copyAddress->setEnabled(false);
    }
}

void AddressBookPage::done(int retval)
{
    QTableView *table = ui->tableView;
    if(!table->selectionModel() || !table->model())
        return;

    // Figure out which address was selected, and return it
    QModelIndexList indexes = table->selectionModel()->selectedRows(AddressTableModel::Address);

    for (const QModelIndex& index : indexes) {
        QVariant address = table->model()->data(index);
        returnValue = address.toString();
    }

    if(returnValue.isEmpty())
    {
        // If no address entry selected, return rejected
        retval = Rejected;
    }

    QDialog::done(retval);
}

void AddressBookPage::on_exportButton_clicked()
{
    // CSV is currently the only supported format
    QString filename = GUIUtil::getSaveFileName(this,
        tr("Export Address List"), QString(),
        /*: Expanded name of the CSV file format.
            See: https://en.wikipedia.org/wiki/Comma-separated_values. */
        tr("Comma separated file") + QLatin1String(" (*.csv)"), nullptr);

    if (filename.isNull())
        return;

    CSVModelWriter writer(filename);

    // name, column, role
    writer.setModel(proxyModel);
    writer.addColumn("Label", AddressTableModel::Label, Qt::EditRole);
    writer.addColumn("Address", AddressTableModel::Address, Qt::EditRole);

    if(!writer.write()) {
        QMessageBox::critical(this, tr("Exporting Failed"),
            /*: An error message. %1 is a stand-in argument for the name
                of the file we attempted to save to. */
            tr("There was an error trying to save the address list to %1. Please try again.").arg(filename));
    }
}

void AddressBookPage::contextualMenu(const QPoint &point)
{
    QModelIndex index = ui->tableView->indexAt(point);
    if(index.isValid())
    {
        contextMenu->exec(QCursor::pos());
    }
}

void AddressBookPage::selectNewAddress(const QModelIndex &parent, int begin, int /*end*/)
{
    QModelIndex idx = proxyModel->mapFromSource(model->index(begin, AddressTableModel::Address, parent));
    if(idx.isValid() && (idx.data(Qt::EditRole).toString() == newAddressToSelect))
    {
        // Select row of newly created address, once
        ui->tableView->setFocus();
        ui->tableView->selectRow(idx.row());
        newAddressToSelect.clear();
    }
}