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using Gee;
using Gtk;

using Dino.Entities;

namespace Dino.Plugins.OpenPgp {

[GtkTemplate (ui = "/im/dino/account_settings_item.ui")]

private class AccountSettingsWidget : Stack, Plugins.AccountSettingsWidget {
    [GtkChild] private Label label;
    [GtkChild] private Button button;
    [GtkChild] private ComboBox combobox;

    private Plugin plugin;
    private Account current_account;
    private Gee.List<GPG.Key> keys = null;
    private Gtk.ListStore list_store = new Gtk.ListStore(2, typeof(string), typeof(string?));

    public AccountSettingsWidget(Plugin plugin) {
        this.plugin = plugin;

        CellRendererText renderer = new CellRendererText();
        renderer.set_padding(0, 0);
        combobox.pack_start(renderer, true);
        combobox.add_attribute(renderer, "markup", 0);
        combobox.set_model(list_store);

        button.clicked.connect(on_button_clicked);
        combobox.changed.connect(key_changed);
    }

    public void deactivate() {
        set_visible_child_name("label");
    }

    public void set_account(Account account) {
        this.current_account = account;
        if (keys == null) {
            fetch_keys();
        } else {
            activate_current_account();
        }
    }

    private void on_button_clicked() {
        activated();
        set_visible_child_name("entry");
        combobox.grab_focus();
        combobox.popup();
    }

    private void activate_current_account() {
        combobox.changed.disconnect(key_changed);

        string? account_key = plugin.db.get_account_key(current_account);
        int activate_index = 0;
        for (int i = 0; i < keys.size; i++) {
            GPG.Key key = keys[i];
            if (key.fpr == account_key) {
                activate_index = i + 1;
            }
        }
        combobox.active = activate_index;

        TreeIter selected;
        combobox.get_active_iter(out selected);
        set_label_active(selected);

        combobox.changed.connect(key_changed);
    }

    private void populate_list_store() {
        if (keys.size == 0) {
            label.set_markup(build_markup_string(_("Key publishing disabled"), _("No keys available. Generate one!")));
            return;
        }

        TreeIter iter;
        list_store.append(out iter);
        list_store.set(iter, 0, build_markup_string(_("Key publishing disabled"), _("Select key") + "<span font_family='monospace' font='8'> \n </span>"), 1, "");
        for (int i = 0; i < keys.size; i++) {
            list_store.append(out iter);
            list_store.set(iter, 0, @"$(Markup.escape_text(keys[i].uids[0].uid))\n<span font_family='monospace' font='8'>$(markup_colorize_id(keys[i].fpr, true))</span><span font='8'> </span>");
            list_store.set(iter, 1, keys[i].fpr);
            if (keys[i].fpr == plugin.db.get_account_key(current_account)) {
                set_label_active(iter, i + 1);
            }
        }
        activate_current_account();
        button.sensitive = true;
    }

    private void fetch_keys() {
        TreeIter iter;
        list_store.clear();
        list_store.append(out iter);
        label.set_markup(build_markup_string(_("Loading..."), _("Querying GnuPG")));
        new Thread<void*> (null, () => { // Querying GnuPG might take some time
            try {
                keys = GPGHelper.get_keylist(null, true);
                Idle.add(() => {
                    list_store.clear();
                    populate_list_store();
                    return false;
                });
            } catch (Error e) {
                Idle.add(() => {
                    label.set_markup(build_markup_string(_("Key publishing disabled"), _("Error in GnuPG")));
                    return false;
                });
            }
            return null;
        });
    }

    private void set_label_active(TreeIter iter, int i = -1) {
        Value text;
        list_store.get_value(iter, 0, out text);
        label.set_markup((string) text);
        if (i != -1) combobox.active = i;
    }

    private void key_changed() {
        TreeIter selected;
        bool iter_valid = combobox.get_active_iter(out selected);
        if (iter_valid) {
            Value key_value;
            list_store.get_value(selected, 1, out key_value);
            string? key_id = key_value as string;
            if (key_id != null) {
                if (plugin.modules.has_key(current_account)) {
                    plugin.modules[current_account].set_private_key_id(key_id);
                }
                plugin.db.set_account_key(current_account, key_id);
            }
            set_label_active(selected);
            deactivate();
        }
    }

    private string build_markup_string(string primary, string secondary) {
        return @"$(Markup.escape_text(primary))\n<span font='8'>$secondary</span>";
    }
}

}