// This file Copyright © 2007-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.

#include <algorithm> // std::max()
#include <cstring> // strchr()
#include <memory>
#include <optional>
#include <string>
#include <string_view>

#include <glibmm.h>
#include <glibmm/i18n.h>

#include <fmt/core.h>

#include <libtransmission/transmission.h>
#include <libtransmission/utils.h> /* tr_truncd() */

#include "HigWorkarea.h" // GUI_PAD, GUI_PAD_SMALL
#include "IconCache.h"
#include "TorrentCellRenderer.h"
#include "Utils.h"

/* #define TEST_RTL */

/***
****
***/

namespace
{

auto const DefaultBarHeight = 12;
auto const CompactBarWidth = 50;
auto const SmallScale = 0.9;
auto const CompactIconSize = IF_GTKMM4(Gtk::IconSize::NORMAL, Gtk::ICON_SIZE_MENU);
auto const FullIconSize = IF_GTKMM4(Gtk::IconSize::LARGE, Gtk::ICON_SIZE_DND);

auto get_height(Gtk::Requisition const& req)
{
    return req.IF_GTKMM4(get_height(), height);
}

auto get_width(Gtk::Requisition const& req)
{
    return req.IF_GTKMM4(get_width(), width);
}

auto getProgressString(tr_torrent const* tor, uint64_t total_size, tr_stat const* st)
{
    Glib::ustring gstr;

    bool const isDone = st->leftUntilDone == 0;
    uint64_t const haveTotal = st->haveUnchecked + st->haveValid;
    bool const isSeed = st->haveValid >= total_size;
    double seedRatio = 0;
    bool const hasSeedRatio = tr_torrentGetSeedRatio(tor, &seedRatio);

    if (!isDone) // downloading
    {
        // 50 MB of 200 MB (25%)
        gstr += fmt::format(
            _("{current_size} of {complete_size} ({percent_done}%)"),
            fmt::arg("current_size", tr_strlsize(haveTotal)),
            fmt::arg("complete_size", tr_strlsize(st->sizeWhenDone)),
            fmt::arg("percent_done", tr_strpercent(st->percentDone * 100.0)));
    }
    else if (!isSeed && hasSeedRatio) // partial seed, seed ratio
    {
        // 50 MB of 200 MB (25%), uploaded 30 MB (Ratio: X%, Goal: Y%)
        gstr += fmt::format(
            // xgettext:no-c-format
            _("{current_size} of {complete_size} ({percent_complete}%), uploaded {uploaded_size} (Ratio: {ratio}, Goal: {seed_ratio})"),
            fmt::arg("current_size", tr_strlsize(haveTotal)),
            fmt::arg("complete_size", tr_strlsize(total_size)),
            fmt::arg("percent_complete", tr_strpercent(st->percentComplete * 100.0)),
            fmt::arg("uploaded_size", tr_strlsize(st->uploadedEver)),
            fmt::arg("ratio", tr_strlratio(st->ratio)),
            fmt::arg("seed_ratio", tr_strlratio(seedRatio)));
    }
    else if (!isSeed) // partial seed, no seed ratio
    {
        gstr += fmt::format(
            // xgettext:no-c-format
            _("{current_size} of {complete_size} ({percent_complete}%), uploaded {uploaded_size} (Ratio: {ratio})"),
            fmt::arg("current_size", tr_strlsize(haveTotal)),
            fmt::arg("complete_size", tr_strlsize(total_size)),
            fmt::arg("percent_complete", tr_strpercent(st->percentComplete * 100.0)),
            fmt::arg("uploaded_size", tr_strlsize(st->uploadedEver)),
            fmt::arg("ratio", tr_strlratio(st->ratio)));
    }
    else if (hasSeedRatio) // seed, seed ratio
    {
        gstr += fmt::format(
            _("{complete_size}, uploaded {uploaded_size} (Ratio: {ratio}, Goal: {seed_ratio})"),
            fmt::arg("complete_size", tr_strlsize(total_size)),
            fmt::arg("uploaded_size", tr_strlsize(st->uploadedEver)),
            fmt::arg("ratio", tr_strlratio(st->ratio)),
            fmt::arg("seed_ratio", tr_strlratio(seedRatio)));
    }
    else // seed, no seed ratio
    {
        gstr += fmt::format(
            _("{complete_size}, uploaded {uploaded_size} (Ratio: {ratio})"),
            fmt::arg("complete_size", tr_strlsize(total_size)),
            fmt::arg("uploaded_size", tr_strlsize(st->uploadedEver)),
            fmt::arg("ratio", tr_strlratio(st->ratio)));
    }

    // add time remaining when applicable
    if (st->activity == TR_STATUS_DOWNLOAD || (hasSeedRatio && st->activity == TR_STATUS_SEED))
    {
        int const eta = st->eta;
        gstr += " - ";

        if (eta < 0)
        {
            gstr += _("Remaining time unknown");
        }
        else
        {
            gstr += tr_format_time_left(eta);
        }
    }

    return gstr;
}

std::string getShortTransferString(
    tr_torrent const* const tor,
    tr_stat const* const st,
    double uploadSpeed_KBps,
    double downloadSpeed_KBps)
{
    bool const have_meta = tr_torrentHasMetadata(tor);

    if (bool const have_down = have_meta && (st->peersSendingToUs > 0 || st->webseedsSendingToUs > 0); have_down)
    {
        return fmt::format(
            _("{download_speed} ▼  {upload_speed} ▲"),
            fmt::arg("upload_speed", tr_formatter_speed_KBps(uploadSpeed_KBps)),
            fmt::arg("download_speed", tr_formatter_speed_KBps(downloadSpeed_KBps)));
    }

    if (bool const have_up = have_meta && st->peersGettingFromUs > 0; have_up)
    {
        return fmt::format(_("{upload_speed} ▲"), fmt::arg("upload_speed", tr_formatter_speed_KBps(uploadSpeed_KBps)));
    }

    if (st->isStalled)
    {
        return _("Stalled");
    }

    return {};
}

std::string getShortStatusString(
    tr_torrent const* const tor,
    tr_stat const* const st,
    double uploadSpeed_KBps,
    double downloadSpeed_KBps)
{
    switch (st->activity)
    {
    case TR_STATUS_STOPPED:
        return st->finished ? _("Finished") : _("Paused");

    case TR_STATUS_CHECK_WAIT:
        return _("Queued for verification");

    case TR_STATUS_DOWNLOAD_WAIT:
        return _("Queued for download");

    case TR_STATUS_SEED_WAIT:
        return _("Queued for seeding");

    case TR_STATUS_CHECK:
        return fmt::format(
            // xgettext:no-c-format
            _("Verifying local data ({percent_done}% tested)"),
            fmt::arg("percent_done", tr_truncd(st->recheckProgress * 100.0, 1)));

    case TR_STATUS_DOWNLOAD:
    case TR_STATUS_SEED:
        return fmt::format(
            FMT_STRING("{:s} {:s}"),
            getShortTransferString(tor, st, uploadSpeed_KBps, downloadSpeed_KBps),
            fmt::format(_("Ratio: {ratio}"), fmt::arg("ratio", tr_strlratio(st->ratio))));

    default:
        return {};
    }
}

std::optional<std::string> getErrorString(tr_stat const* st)
{
    switch (st->error)
    {
    case TR_STAT_TRACKER_WARNING:
        return fmt::format(_("Tracker warning: '{warning}'"), fmt::arg("warning", st->errorString));

    case TR_STAT_TRACKER_ERROR:
        return fmt::format(_("Tracker Error: '{error}'"), fmt::arg("error", st->errorString));

    case TR_STAT_LOCAL_ERROR:
        return fmt::format(_("Local error: '{error}'"), fmt::arg("error", st->errorString));

    default:
        return std::nullopt;
    }
}

auto getActivityString(
    tr_torrent const* const tor,
    tr_stat const* const st,
    double const uploadSpeed_KBps,
    double const downloadSpeed_KBps)
{
    switch (st->activity)
    {
    case TR_STATUS_STOPPED:
    case TR_STATUS_CHECK_WAIT:
    case TR_STATUS_CHECK:
    case TR_STATUS_DOWNLOAD_WAIT:
    case TR_STATUS_SEED_WAIT:
        return getShortStatusString(tor, st, uploadSpeed_KBps, downloadSpeed_KBps);

    case TR_STATUS_DOWNLOAD:
        if (!tr_torrentHasMetadata(tor))
        {
            return fmt::format(
                ngettext(
                    // xgettext:no-c-format
                    "Downloading metadata from {active_count} connected peer ({percent_done}% done)",
                    "Downloading metadata from {active_count} connected peers ({percent_done}% done)",
                    st->peersConnected),
                fmt::arg("active_count", st->peersConnected),
                fmt::arg("percent_done", tr_strpercent(st->metadataPercentComplete * 100.0)));
        }

        if (st->peersSendingToUs != 0 && st->webseedsSendingToUs != 0)
        {
            return fmt::format(
                ngettext(
                    "Downloading from {active_count} of {connected_count} connected peer and webseed",
                    "Downloading from {active_count} of {connected_count} connected peers and webseeds",
                    st->peersConnected + st->webseedsSendingToUs),
                fmt::arg("active_count", st->peersSendingToUs + st->webseedsSendingToUs),
                fmt::arg("connected_count", st->peersConnected + st->webseedsSendingToUs));
        }

        if (st->webseedsSendingToUs != 0)
        {
            return fmt::format(
                ngettext(
                    "Downloading from {active_count} webseed",
                    "Downloading from {active_count} webseeds",
                    st->webseedsSendingToUs),
                fmt::arg("active_count", st->webseedsSendingToUs));
        }

        return fmt::format(
            ngettext(
                "Downloading from {active_count} of {connected_count} connected peer",
                "Downloading from {active_count} of {connected_count} connected peers",
                st->peersConnected),
            fmt::arg("active_count", st->peersSendingToUs),
            fmt::arg("connected_count", st->peersConnected));

    case TR_STATUS_SEED:
        return fmt::format(
            ngettext(
                "Seeding to {active_count} of {connected_count} connected peer",
                "Seeding to {active_count} of {connected_count} connected peers",
                st->peersConnected),
            fmt::arg("active_count", st->peersGettingFromUs),
            fmt::arg("connected_count", st->peersConnected));

    default:
        g_assert_not_reached();
        return std::string{};
    }
}

std::string getStatusString(
    tr_torrent const* tor,
    tr_stat const* st,
    double const uploadSpeed_KBps,
    double const downloadSpeed_KBps,
    bool ignore_errors = false)
{
    auto status_str = (ignore_errors ? std::nullopt : getErrorString(st))
                          .value_or(getActivityString(tor, st, uploadSpeed_KBps, downloadSpeed_KBps));

    if (st->activity != TR_STATUS_CHECK_WAIT && st->activity != TR_STATUS_CHECK && st->activity != TR_STATUS_DOWNLOAD_WAIT &&
        st->activity != TR_STATUS_SEED_WAIT && st->activity != TR_STATUS_STOPPED)
    {
        if (auto const buf = getShortTransferString(tor, st, uploadSpeed_KBps, downloadSpeed_KBps); !std::empty(buf))
        {
            status_str += fmt::format(FMT_STRING(" - {:s}"), buf);
        }
    }

    return status_str;
}

} // namespace

/***
****
***/

class TorrentCellRenderer::Impl
{
    using SnapshotPtr = TorrentCellRenderer::SnapshotPtr;
    using IconSize = IF_GTKMM4(Gtk::IconSize, Gtk::BuiltinIconSize);

public:
    explicit Impl(TorrentCellRenderer& renderer);
    ~Impl();

    TR_DISABLE_COPY_MOVE(Impl)

    Gtk::Requisition get_size_compact(Gtk::Widget& widget) const;
    Gtk::Requisition get_size_full(Gtk::Widget& widget) const;

    void render_compact(
        SnapshotPtr const& snapshot,
        Gtk::Widget& widget,
        Gdk::Rectangle const& background_area,
        Gtk::CellRendererState flags);
    void render_full(
        SnapshotPtr const& snapshot,
        Gtk::Widget& widget,
        Gdk::Rectangle const& background_area,
        Gtk::CellRendererState flags);

    auto& property_torrent()
    {
        return property_torrent_;
    }

    auto& property_bar_height()
    {
        return property_bar_height_;
    }

    auto& property_upload_speed_KBps()
    {
        return property_upload_speed_KBps_;
    }

    auto& property_download_speed_KBps()
    {
        return property_download_speed_KBps_;
    }

    auto& property_compact()
    {
        return property_compact_;
    }

private:
    void render_progress_bar(
        SnapshotPtr const& snapshot,
        Gtk::Widget& widget,
        Gdk::Rectangle const& area,
        Gtk::CellRendererState flags,
        Gdk::RGBA const& color);

    static void set_icon(Gtk::CellRendererPixbuf& renderer, Glib::RefPtr<Gio::Icon> const& icon, IconSize icon_size);
    static void adjust_progress_bar_hue(
        Cairo::RefPtr<Cairo::Surface> const& bg_surface,
        Cairo::RefPtr<Cairo::Context> const& context,
        Gdk::RGBA const& color,
        Gdk::Rectangle const& area,
        double bg_x,
        double bg_y);

private:
    TorrentCellRenderer& renderer_;

    Glib::Property<gpointer> property_torrent_;
    Glib::Property<int> property_bar_height_;
    Glib::Property<double> property_upload_speed_KBps_;
    Glib::Property<double> property_download_speed_KBps_;
    Glib::Property<bool> property_compact_;

    Gtk::CellRendererText* text_renderer_ = nullptr;
    Gtk::CellRendererProgress* progress_renderer_ = nullptr;
    Gtk::CellRendererPixbuf* icon_renderer_ = nullptr;
};

/***
****
***/

namespace
{

Glib::RefPtr<Gio::Icon> get_icon(tr_torrent const* tor)
{
    auto mime_type = std::string_view{};

    if (auto const n_files = tr_torrentFileCount(tor); n_files == 0)
    {
        mime_type = UnknownMimeType;
    }
    else if (n_files > 1)
    {
        mime_type = DirectoryMimeType;
    }
    else
    {
        auto const* const name = tr_torrentFile(tor, 0).name;

        mime_type = strchr(name, '/') != nullptr ? DirectoryMimeType : tr_get_mime_type_for_filename(name);
    }

    return gtr_get_mime_type_icon(mime_type);
}

} // namespace

/***
****
***/

void TorrentCellRenderer::Impl::set_icon(
    Gtk::CellRendererPixbuf& renderer,
    Glib::RefPtr<Gio::Icon> const& icon,
    IconSize icon_size)
{
    renderer.property_gicon() = icon;
#if GTKMM_CHECK_VERSION(4, 0, 0)
    renderer.property_icon_size() = icon_size;
#else
    renderer.property_stock_size() = icon_size;
#endif
}

Gtk::Requisition TorrentCellRenderer::Impl::get_size_compact(Gtk::Widget& widget) const
{
    int xpad = 0;
    int ypad = 0;
    Gtk::Requisition min_size;
    Gtk::Requisition icon_size;
    Gtk::Requisition name_size;
    Gtk::Requisition stat_size;

    auto* const tor = static_cast<tr_torrent*>(property_torrent_.get_value());
    auto const* const st = tr_torrentStatCached(tor);

    auto const icon = get_icon(tor);
    auto const name = Glib::ustring(tr_torrentName(tor));
    auto const gstr_stat = getShortStatusString(
        tor,
        st,
        property_upload_speed_KBps_.get_value(),
        property_download_speed_KBps_.get_value());
    renderer_.get_padding(xpad, ypad);

    /* get the idealized cell dimensions */
    set_icon(*icon_renderer_, icon, CompactIconSize);
    icon_renderer_->get_preferred_size(widget, min_size, icon_size);
    text_renderer_->property_text() = name;
    text_renderer_->property_ellipsize() = TR_PANGO_ELLIPSIZE_MODE(NONE);
    text_renderer_->property_scale() = 1.0;
    text_renderer_->get_preferred_size(widget, min_size, name_size);
    text_renderer_->property_text() = gstr_stat;
    text_renderer_->property_scale() = SmallScale;
    text_renderer_->get_preferred_size(widget, min_size, stat_size);

    /**
    *** LAYOUT
    **/

    return { xpad * 2 + get_width(icon_size) + GUI_PAD + CompactBarWidth + GUI_PAD + get_width(stat_size),
             ypad * 2 + std::max(get_height(name_size), property_bar_height_.get_value()) };
}

Gtk::Requisition TorrentCellRenderer::Impl::get_size_full(Gtk::Widget& widget) const
{
    int xpad = 0;
    int ypad = 0;
    Gtk::Requisition min_size;
    Gtk::Requisition icon_size;
    Gtk::Requisition name_size;
    Gtk::Requisition stat_size;
    Gtk::Requisition prog_size;

    auto* const tor = static_cast<tr_torrent*>(property_torrent_.get_value());
    auto const* const st = tr_torrentStatCached(tor);
    auto const total_size = tr_torrentTotalSize(tor);

    auto const icon = get_icon(tor);
    auto const name = Glib::ustring(tr_torrentName(tor));
    auto const gstr_stat = getStatusString(
        tor,
        st,
        property_upload_speed_KBps_.get_value(),
        property_download_speed_KBps_.get_value(),
        true);
    auto const gstr_prog = getProgressString(tor, total_size, st);
    renderer_.get_padding(xpad, ypad);

    /* get the idealized cell dimensions */
    set_icon(*icon_renderer_, icon, FullIconSize);
    icon_renderer_->get_preferred_size(widget, min_size, icon_size);
    text_renderer_->property_text() = name;
    text_renderer_->property_weight() = TR_PANGO_WEIGHT(BOLD);
    text_renderer_->property_scale() = 1.0;
    text_renderer_->property_ellipsize() = TR_PANGO_ELLIPSIZE_MODE(NONE);
    text_renderer_->get_preferred_size(widget, min_size, name_size);
    text_renderer_->property_text() = gstr_prog;
    text_renderer_->property_weight() = TR_PANGO_WEIGHT(NORMAL);
    text_renderer_->property_scale() = SmallScale;
    text_renderer_->get_preferred_size(widget, min_size, prog_size);
    text_renderer_->property_text() = gstr_stat;
    text_renderer_->get_preferred_size(widget, min_size, stat_size);

    /**
    *** LAYOUT
    **/

    return { xpad * 2 + get_width(icon_size) + GUI_PAD + std::max(get_width(prog_size), get_width(stat_size)),
             ypad * 2 + get_height(name_size) + get_height(prog_size) + GUI_PAD_SMALL + property_bar_height_.get_value() +
                 GUI_PAD_SMALL + get_height(stat_size) };
}

void TorrentCellRenderer::get_preferred_width_vfunc(Gtk::Widget& widget, int& minimum_width, int& natural_width) const
{
    if (impl_->property_torrent().get_value() != nullptr)
    {
        auto const size = impl_->property_compact().get_value() ? impl_->get_size_compact(widget) :
                                                                  impl_->get_size_full(widget);

        minimum_width = get_width(size);
        natural_width = minimum_width;
    }
}

void TorrentCellRenderer::get_preferred_height_vfunc(Gtk::Widget& widget, int& minimum_height, int& natural_height) const
{
    if (impl_->property_torrent().get_value() != nullptr)
    {
        auto const size = impl_->property_compact().get_value() ? impl_->get_size_compact(widget) :
                                                                  impl_->get_size_full(widget);

        minimum_height = get_height(size);
        natural_height = minimum_height;
    }
}

namespace
{

int get_percent_done(tr_torrent const* tor, tr_stat const* st)
{
    auto const seed = st->activity == TR_STATUS_SEED && tr_torrentGetSeedRatio(tor, nullptr);
    return static_cast<int>((seed ? std::max(0.0F, st->seedRatioPercentDone) : std::max(0.0F, st->percentDone)) * 100);
}

Gdk::RGBA const& get_progress_bar_color(tr_stat const& st)
{
    static auto const steelblue_color = Gdk::RGBA("steelblue");
    static auto const forestgreen_color = Gdk::RGBA("forestgreen");
    static auto const silver_color = Gdk::RGBA("silver");

    return st.activity == TR_STATUS_DOWNLOAD ? steelblue_color :
                                               (st.activity == TR_STATUS_SEED ? forestgreen_color : silver_color);
}

Cairo::RefPtr<Cairo::Surface> get_mask_surface(Cairo::RefPtr<Cairo::Surface> const& surface, Gdk::Rectangle const& area)
{
    auto const mask_surface = Cairo::ImageSurface::create(TR_CAIRO_SURFACE_FORMAT(A8), area.get_width(), area.get_height());
    auto const mask_context = Cairo::Context::create(mask_surface);

    mask_context->set_source_rgb(0, 0, 0);
    mask_context->rectangle(area.get_x(), area.get_y(), area.get_width(), area.get_height());
    mask_context->fill();

    mask_context->set_operator(TR_CAIRO_CONTEXT_OPERATOR(CLEAR));
    mask_context->mask(surface, area.get_x(), area.get_y());
    mask_context->fill();

    return mask_surface;
}

template<typename... Ts>
void render_impl(Gtk::CellRenderer& renderer, Ts&&... args)
{
    renderer.IF_GTKMM4(snapshot, render)(std::forward<Ts>(args)...);
}

} // namespace

void TorrentCellRenderer::Impl::adjust_progress_bar_hue(
    Cairo::RefPtr<Cairo::Surface> const& bg_surface,
    Cairo::RefPtr<Cairo::Context> const& context,
    Gdk::RGBA const& color,
    Gdk::Rectangle const& area,
    double bg_x,
    double bg_y)
{
    using TrCairoContextOperator = IF_GTKMM4(Cairo::Context::Operator, Cairo::Operator);

    auto const mask_surface = get_mask_surface(context->get_target(), area);

    // Add background under the progress bar, for better results around the transparent areas
    context->set_source(bg_surface, bg_x, bg_y);
    context->set_operator(TR_CAIRO_CONTEXT_OPERATOR(DEST_OVER));
    context->rectangle(area.get_x(), area.get_y(), area.get_width(), area.get_height());
    context->fill();

    // Adjust surface color
    context->set_source_rgb(color.get_red(), color.get_green(), color.get_blue());
    context->set_operator(static_cast<TrCairoContextOperator>(CAIRO_OPERATOR_HSL_COLOR));
    context->rectangle(area.get_x(), area.get_y(), area.get_width(), area.get_height());
    context->fill();

    // Clear out masked (fully transparent) areas
    context->set_operator(TR_CAIRO_CONTEXT_OPERATOR(CLEAR));
    context->mask(mask_surface, area.get_x(), area.get_y());
    context->fill();
}

void TorrentCellRenderer::Impl::render_progress_bar(
    SnapshotPtr const& snapshot,
    Gtk::Widget& widget,
    Gdk::Rectangle const& area,
    Gtk::CellRendererState flags,
    Gdk::RGBA const& color)
{
    auto const temp_area = Gdk::Rectangle(0, 0, area.get_width(), area.get_height());
    auto const temp_surface = Cairo::ImageSurface::create(TR_CAIRO_SURFACE_FORMAT(ARGB32), area.get_width(), area.get_height());
    auto const temp_context = Cairo::Context::create(temp_surface);

    {
#if GTKMM_CHECK_VERSION(4, 0, 0)
        auto const temp_snapshot = Gtk::Snapshot::create();
#endif

        render_impl(*progress_renderer_, IF_GTKMM4(temp_snapshot, temp_context), widget, temp_area, temp_area, flags);

#if GTKMM_CHECK_VERSION(4, 0, 0)
        temp_snapshot->reference();
        auto const render_node = std::unique_ptr<GskRenderNode, void (*)(GskRenderNode*)>(
            gtk_snapshot_free_to_node(Glib::unwrap(temp_snapshot)),
            [](GskRenderNode* p) { gsk_render_node_unref(p); });
        gsk_render_node_draw(render_node.get(), temp_context->cobj());
#endif
    }

#if GTKMM_CHECK_VERSION(4, 0, 0)
    auto const context = snapshot->append_cairo(area);
    auto const surface = context->get_target();
#else
    auto const context = snapshot;
    auto const surface = Cairo::Surface::create(
        context->get_target(),
        area.get_x(),
        area.get_y(),
        area.get_width(),
        area.get_height());
#endif

    double dx = 0;
    double dy = 0;
    context->device_to_user(dx, dy);

    adjust_progress_bar_hue(surface, temp_context, color, temp_area, dx - area.get_x(), dy - area.get_y());

    context->set_source(temp_context->get_target(), area.get_x(), area.get_y());
    context->rectangle(area.get_x(), area.get_y(), area.get_width(), area.get_height());
    context->fill();
}

void TorrentCellRenderer::Impl::render_compact(
    SnapshotPtr const& snapshot,
    Gtk::Widget& widget,
    Gdk::Rectangle const& background_area,
    Gtk::CellRendererState flags)
{
    int xpad = 0;
    int ypad = 0;
    int min_width = 0;
    int width = 0;

    auto* const tor = static_cast<tr_torrent*>(property_torrent_.get_value());
    auto const* const st = tr_torrentStatCached(tor);
    bool const active = st->activity != TR_STATUS_STOPPED && st->activity != TR_STATUS_DOWNLOAD_WAIT &&
        st->activity != TR_STATUS_SEED_WAIT;
    auto const percent_done = get_percent_done(tor, st);
    bool const sensitive = active || st->error != 0;

    if (st->activity == TR_STATUS_STOPPED)
    {
        flags |= TR_GTK_CELL_RENDERER_STATE(INSENSITIVE);
    }

    if (st->error != 0 && (flags & TR_GTK_CELL_RENDERER_STATE(SELECTED)) == Gtk::CellRendererState{})
    {
        text_renderer_->property_foreground() = "red";
    }
    else
    {
        text_renderer_->property_foreground_set() = false;
    }

    auto const icon = get_icon(tor);
    auto const name = Glib::ustring(tr_torrentName(tor));
    auto const& progress_color = get_progress_bar_color(*st);
    auto const gstr_stat = getShortStatusString(
        tor,
        st,
        property_upload_speed_KBps_.get_value(),
        property_download_speed_KBps_.get_value());
    renderer_.get_padding(xpad, ypad);

    auto fill_area = background_area;
    fill_area.set_x(fill_area.get_x() + xpad);
    fill_area.set_y(fill_area.get_y() + ypad);
    fill_area.set_width(fill_area.get_width() - xpad * 2);
    fill_area.set_height(fill_area.get_height() - ypad * 2);

    auto icon_area = fill_area;
    set_icon(*icon_renderer_, icon, CompactIconSize);
    icon_renderer_->get_preferred_width(widget, min_width, width);
    icon_area.set_width(width);

    auto prog_area = fill_area;
    prog_area.set_width(CompactBarWidth);

    auto stat_area = fill_area;
    text_renderer_->property_text() = gstr_stat;
    text_renderer_->property_ellipsize() = TR_PANGO_ELLIPSIZE_MODE(NONE);
    text_renderer_->property_scale() = SmallScale;
    text_renderer_->get_preferred_width(widget, min_width, width);
    stat_area.set_width(width);

    auto name_area = fill_area;
    name_area.set_width(
        fill_area.get_width() - icon_area.get_width() - stat_area.get_width() - prog_area.get_width() - GUI_PAD * 3);

    if ((renderer_.get_state(widget, flags) & TR_GTK_STATE_FLAGS(DIR_RTL)) == Gtk::StateFlags{})
    {
        icon_area.set_x(fill_area.get_x());
        prog_area.set_x(fill_area.get_x() + fill_area.get_width() - prog_area.get_width());
        stat_area.set_x(prog_area.get_x() - stat_area.get_width() - GUI_PAD);
        name_area.set_x(icon_area.get_x() + icon_area.get_width() + GUI_PAD);
    }
    else
    {
        icon_area.set_x(fill_area.get_x() + fill_area.get_width() - icon_area.get_width());
        prog_area.set_x(fill_area.get_x());
        stat_area.set_x(prog_area.get_x() + prog_area.get_width() + GUI_PAD);
        name_area.set_x(stat_area.get_x() + stat_area.get_width() + GUI_PAD);
    }

    /**
    *** RENDER
    **/

    set_icon(*icon_renderer_, icon, CompactIconSize);
    icon_renderer_->property_sensitive() = sensitive;
    render_impl(*icon_renderer_, snapshot, widget, icon_area, icon_area, flags);

    progress_renderer_->property_value() = percent_done;
    progress_renderer_->property_text() = fmt::format(FMT_STRING("{:d}%"), percent_done);
    progress_renderer_->property_sensitive() = sensitive;
    render_progress_bar(snapshot, widget, prog_area, flags, progress_color);

    text_renderer_->property_text() = gstr_stat;
    text_renderer_->property_scale() = SmallScale;
    text_renderer_->property_ellipsize() = TR_PANGO_ELLIPSIZE_MODE(END);
    render_impl(*text_renderer_, snapshot, widget, stat_area, stat_area, flags);

    text_renderer_->property_text() = name;
    text_renderer_->property_scale() = 1.0;
    render_impl(*text_renderer_, snapshot, widget, name_area, name_area, flags);
}

void TorrentCellRenderer::Impl::render_full(
    SnapshotPtr const& snapshot,
    Gtk::Widget& widget,
    Gdk::Rectangle const& background_area,
    Gtk::CellRendererState flags)
{
    int xpad = 0;
    int ypad = 0;
    Gtk::Requisition min_size;
    Gtk::Requisition size;

    auto* const tor = static_cast<tr_torrent*>(property_torrent_.get_value());
    auto const* const st = tr_torrentStatCached(tor);
    auto const total_size = tr_torrentTotalSize(tor);
    bool const active = st->activity != TR_STATUS_STOPPED && st->activity != TR_STATUS_DOWNLOAD_WAIT &&
        st->activity != TR_STATUS_SEED_WAIT;
    auto const percent_done = get_percent_done(tor, st);
    bool const sensitive = active || st->error != 0;

    if (st->activity == TR_STATUS_STOPPED)
    {
        flags |= TR_GTK_CELL_RENDERER_STATE(INSENSITIVE);
    }

    if (st->error != 0 && (flags & TR_GTK_CELL_RENDERER_STATE(SELECTED)) == Gtk::CellRendererState{})
    {
        text_renderer_->property_foreground() = "red";
    }
    else
    {
        text_renderer_->property_foreground_set() = false;
    }

    auto const icon = get_icon(tor);
    auto const name = Glib::ustring(tr_torrentName(tor));
    auto const& progress_color = get_progress_bar_color(*st);
    auto const gstr_prog = getProgressString(tor, total_size, st);
    auto const gstr_stat = getStatusString(
        tor,
        st,
        property_upload_speed_KBps_.get_value(),
        property_download_speed_KBps_.get_value());
    renderer_.get_padding(xpad, ypad);

    /* get the idealized cell dimensions */
    Gdk::Rectangle icon_area;
    set_icon(*icon_renderer_, icon, FullIconSize);
    icon_renderer_->get_preferred_size(widget, min_size, size);
    icon_area.set_width(get_width(size));
    icon_area.set_height(get_height(size));

    Gdk::Rectangle name_area;
    text_renderer_->property_text() = name;
    text_renderer_->property_weight() = TR_PANGO_WEIGHT(BOLD);
    text_renderer_->property_ellipsize() = TR_PANGO_ELLIPSIZE_MODE(NONE);
    text_renderer_->property_scale() = 1.0;
    text_renderer_->get_preferred_size(widget, min_size, size);
    name_area.set_height(get_height(size));

    Gdk::Rectangle prog_area;
    text_renderer_->property_text() = gstr_prog;
    text_renderer_->property_weight() = TR_PANGO_WEIGHT(NORMAL);
    text_renderer_->property_scale() = SmallScale;
    text_renderer_->get_preferred_size(widget, min_size, size);
    prog_area.set_height(get_height(size));

    Gdk::Rectangle stat_area;
    text_renderer_->property_text() = gstr_stat;
    text_renderer_->get_preferred_size(widget, min_size, size);
    stat_area.set_height(get_height(size));

    Gdk::Rectangle prct_area;

    /**
    *** LAYOUT
    **/

    auto fill_area = background_area;
    fill_area.set_x(fill_area.get_x() + xpad);
    fill_area.set_y(fill_area.get_y() + ypad);
    fill_area.set_width(fill_area.get_width() - xpad * 2);
    fill_area.set_height(fill_area.get_height() - ypad * 2);

    /* icon */
    icon_area.set_y(fill_area.get_y() + (fill_area.get_height() - icon_area.get_height()) / 2);

    /* name */
    name_area.set_y(fill_area.get_y());
    name_area.set_width(fill_area.get_width() - GUI_PAD - icon_area.get_width());

    if ((renderer_.get_state(widget, flags) & TR_GTK_STATE_FLAGS(DIR_RTL)) == Gtk::StateFlags{})
    {
        icon_area.set_x(fill_area.get_x());
        name_area.set_x(fill_area.get_x() + fill_area.get_width() - name_area.get_width());
    }
    else
    {
        icon_area.set_x(fill_area.get_x() + fill_area.get_width() - icon_area.get_width());
        name_area.set_x(fill_area.get_x());
    }

    /* prog */
    prog_area.set_x(name_area.get_x());
    prog_area.set_y(name_area.get_y() + name_area.get_height());
    prog_area.set_width(name_area.get_width());

    /* progressbar */
    prct_area.set_x(prog_area.get_x());
    prct_area.set_y(prog_area.get_y() + prog_area.get_height() + GUI_PAD_SMALL);
    prct_area.set_width(prog_area.get_width());
    prct_area.set_height(property_bar_height_.get_value());

    /* status */
    stat_area.set_x(prct_area.get_x());
    stat_area.set_y(prct_area.get_y() + prct_area.get_height() + GUI_PAD_SMALL);
    stat_area.set_width(prct_area.get_width());

    /**
    *** RENDER
    **/

    set_icon(*icon_renderer_, icon, FullIconSize);
    icon_renderer_->property_sensitive() = sensitive;
    render_impl(*icon_renderer_, snapshot, widget, icon_area, icon_area, flags);

    text_renderer_->property_text() = name;
    text_renderer_->property_scale() = 1.0;
    text_renderer_->property_ellipsize() = TR_PANGO_ELLIPSIZE_MODE(END);
    text_renderer_->property_weight() = TR_PANGO_WEIGHT(BOLD);
    render_impl(*text_renderer_, snapshot, widget, name_area, name_area, flags);

    text_renderer_->property_text() = gstr_prog;
    text_renderer_->property_scale() = SmallScale;
    text_renderer_->property_weight() = TR_PANGO_WEIGHT(NORMAL);
    render_impl(*text_renderer_, snapshot, widget, prog_area, prog_area, flags);

    progress_renderer_->property_value() = percent_done;
    progress_renderer_->property_text() = Glib::ustring();
    progress_renderer_->property_sensitive() = sensitive;
    render_progress_bar(snapshot, widget, prct_area, flags, progress_color);

    text_renderer_->property_text() = gstr_stat;
    render_impl(*text_renderer_, snapshot, widget, stat_area, stat_area, flags);
}

void TorrentCellRenderer::IF_GTKMM4(snapshot_vfunc, render_vfunc)(
    SnapshotPtr const& snapshot,
    Gtk::Widget& widget,
    Gdk::Rectangle const& background_area,
    Gdk::Rectangle const& /*cell_area*/,
    Gtk::CellRendererState flags)
{
#ifdef TEST_RTL
    auto const real_dir = widget.get_direction();
    widget.set_direction(Gtk::TEXT_DIR_RTL);
#endif

    if (impl_->property_torrent().get_value() != nullptr)
    {
        if (impl_->property_compact().get_value())
        {
            impl_->render_compact(snapshot, widget, background_area, flags);
        }
        else
        {
            impl_->render_full(snapshot, widget, background_area, flags);
        }
    }

#ifdef TEST_RTL
    widget.set_direction(real_dir);
#endif
}

TorrentCellRenderer::Impl::~Impl()
{
    text_renderer_->unreference();
    progress_renderer_->unreference();
    icon_renderer_->unreference();
}

TorrentCellRenderer::TorrentCellRenderer()
    : Glib::ObjectBase(typeid(TorrentCellRenderer))
    , impl_(std::make_unique<Impl>(*this))
{
}

TorrentCellRenderer::~TorrentCellRenderer() = default;

TorrentCellRenderer::Impl::Impl(TorrentCellRenderer& renderer)
    : renderer_(renderer)
    , property_torrent_(renderer, "torrent", nullptr)
    , property_bar_height_(renderer, "bar-height", DefaultBarHeight)
    , property_upload_speed_KBps_(renderer, "piece-upload-speed", 0)
    , property_download_speed_KBps_(renderer, "piece-download-speed", 0)
    , property_compact_(renderer, "compact", false)
    , text_renderer_(Gtk::make_managed<Gtk::CellRendererText>())
    , progress_renderer_(Gtk::make_managed<Gtk::CellRendererProgress>())
    , icon_renderer_(Gtk::make_managed<Gtk::CellRendererPixbuf>())
{
    text_renderer_->property_xpad() = 0;
    text_renderer_->property_ypad() = 0;
}

Glib::PropertyProxy<gpointer> TorrentCellRenderer::property_torrent()
{
    return impl_->property_torrent().get_proxy();
}

Glib::PropertyProxy<double> TorrentCellRenderer::property_piece_upload_speed()
{
    return impl_->property_upload_speed_KBps().get_proxy();
}

Glib::PropertyProxy<double> TorrentCellRenderer::property_piece_download_speed()
{
    return impl_->property_download_speed_KBps().get_proxy();
}

Glib::PropertyProxy<int> TorrentCellRenderer::property_bar_height()
{
    return impl_->property_bar_height().get_proxy();
}

Glib::PropertyProxy<bool> TorrentCellRenderer::property_compact()
{
    return impl_->property_compact().get_proxy();
}