// This file Copyright © 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 "RelocateDialog.h"

#include "GtkCompat.h"
#include "PathButton.h"
#include "Prefs.h" /* gtr_pref_string_get */
#include "Session.h"
#include "Utils.h"

#include <glibmm/i18n.h>
#include <glibmm/main.h>
#include <glibmm/ustring.h>
#include <gtkmm/checkbutton.h>
#include <gtkmm/messagedialog.h>

#include <fmt/core.h>

#include <memory>
#include <string>

namespace
{

std::string targetLocation;

}

class RelocateDialog::Impl
{
public:
    Impl(
        RelocateDialog& dialog,
        Glib::RefPtr<Gtk::Builder> const& builder,
        Glib::RefPtr<Session> const& core,
        std::vector<tr_torrent_id_t> const& torrent_ids);
    ~Impl();

    TR_DISABLE_COPY_MOVE(Impl)

private:
    void onResponse(int response);
    bool onTimer();

    void startMovingNextTorrent();

private:
    RelocateDialog& dialog_;
    Glib::RefPtr<Session> const core_;
    std::vector<tr_torrent_id_t> torrent_ids_;

    int done_ = 0;
    bool do_move_ = false;
    sigc::connection timer_;
    std::unique_ptr<Gtk::MessageDialog> message_dialog_;
    PathButton* chooser_ = nullptr;
    Gtk::CheckButton* move_tb_ = nullptr;
};

RelocateDialog::Impl::~Impl()
{
    timer_.disconnect();
}

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

void RelocateDialog::Impl::startMovingNextTorrent()
{
    auto* const tor = core_->find_torrent(torrent_ids_.back());

    if (tor != nullptr)
    {
        tr_torrentSetLocation(tor, targetLocation.c_str(), do_move_, &done_);
    }

    torrent_ids_.pop_back();

    message_dialog_->set_message(
        fmt::format(_("Moving '{torrent_name}'"), fmt::arg("torrent_name", tr_torrentName(tor))),
        true);
}

/* every once in awhile, check to see if the move is done.
 * if so, delete the dialog */
bool RelocateDialog::Impl::onTimer()
{
    if (done_ == TR_LOC_ERROR)
    {
        auto d = std::make_shared<Gtk::MessageDialog>(
            *message_dialog_,
            _("Couldn't move torrent"),
            false,
            TR_GTK_MESSAGE_TYPE(ERROR),
            TR_GTK_BUTTONS_TYPE(CLOSE),
            true);

        d->signal_response().connect(
            [this, d](int /*response*/) mutable
            {
                d.reset();
                message_dialog_.reset();
                dialog_.close();
            });

        d->show();
        return false;
    }

    if (done_ == TR_LOC_DONE)
    {
        if (!torrent_ids_.empty())
        {
            startMovingNextTorrent();
        }
        else
        {
            message_dialog_.reset();
            dialog_.close();
            return false;
        }
    }

    return true;
}

void RelocateDialog::Impl::onResponse(int response)
{
    if (response == TR_GTK_RESPONSE_TYPE(APPLY))
    {
        auto const location = chooser_->get_filename();

        do_move_ = move_tb_->get_active();

        /* pop up a dialog saying that the work is in progress */
        message_dialog_ = std::make_unique<Gtk::MessageDialog>(
            dialog_,
            Glib::ustring(),
            false,
            TR_GTK_MESSAGE_TYPE(INFO),
            TR_GTK_BUTTONS_TYPE(CLOSE),
            true);
        message_dialog_->set_secondary_text(_("This may take a moment…"));
        message_dialog_->set_response_sensitive(TR_GTK_RESPONSE_TYPE(CLOSE), false);
        message_dialog_->show();

        /* remember this location for the next torrent */
        targetLocation = location;

        /* remember this location so that it can be the default next time */
        gtr_save_recent_dir("relocate", core_, location);

        /* start the move and periodically check its status */
        done_ = TR_LOC_DONE;
        timer_ = Glib::signal_timeout().connect_seconds(sigc::mem_fun(*this, &Impl::onTimer), 1);
        onTimer();
    }
    else
    {
        dialog_.close();
    }
}

RelocateDialog::RelocateDialog(
    BaseObjectType* cast_item,
    Glib::RefPtr<Gtk::Builder> const& builder,
    Gtk::Window& parent,
    Glib::RefPtr<Session> const& core,
    std::vector<int> const& torrent_ids)
    : Gtk::Dialog(cast_item)
    , impl_(std::make_unique<Impl>(*this, builder, core, torrent_ids))
{
    set_transient_for(parent);
}

RelocateDialog::~RelocateDialog() = default;

std::unique_ptr<RelocateDialog> RelocateDialog::create(
    Gtk::Window& parent,
    Glib::RefPtr<Session> const& core,
    std::vector<tr_torrent_id_t> const& torrent_ids)
{
    auto const builder = Gtk::Builder::create_from_resource(gtr_get_full_resource_path("RelocateDialog.ui"));
    return std::unique_ptr<RelocateDialog>(
        gtr_get_widget_derived<RelocateDialog>(builder, "RelocateDialog", parent, core, torrent_ids));
}

RelocateDialog::Impl::Impl(
    RelocateDialog& dialog,
    Glib::RefPtr<Gtk::Builder> const& builder,
    Glib::RefPtr<Session> const& core,
    std::vector<tr_torrent_id_t> const& torrent_ids)
    : dialog_(dialog)
    , core_(core)
    , torrent_ids_(torrent_ids)
    , chooser_(gtr_get_widget_derived<PathButton>(builder, "new_location_button"))
    , move_tb_(gtr_get_widget<Gtk::CheckButton>(builder, "move_data_radio"))
{
    dialog_.set_default_response(TR_GTK_RESPONSE_TYPE(CANCEL));
    dialog_.signal_response().connect(sigc::mem_fun(*this, &Impl::onResponse));

    auto recent_dirs = gtr_get_recent_dirs("relocate");
    if (recent_dirs.empty())
    {
        /* default to download dir */
        chooser_->set_filename(gtr_pref_string_get(TR_KEY_download_dir));
    }
    else
    {
        /* set last used as target */
        chooser_->set_filename(recent_dirs.front());
        recent_dirs.pop_front();

        /* add remaining as shortcut */
        chooser_->set_shortcut_folders(recent_dirs);
    }
}
