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/*
 * Copyright 2013 Canonical Ltd.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 3, as published
 * by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranties of
 * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Authors:
 *   Charles Kerr <charles.kerr@canonical.com>
 */

#include <datetime/actions.h>
#include <datetime/utils.h> // split_settings_location()

#include <glib.h>
#include <gio/gio.h>

namespace unity {
namespace indicator {
namespace datetime {

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

namespace
{

void on_desktop_settings_activated(GSimpleAction * /*action*/,
                                   GVariant      * /*param*/,
                                   gpointer        gself)
{
    static_cast<Actions*>(gself)->open_desktop_settings();
}

void on_phone_settings_activated(GSimpleAction * /*action*/,
                                 GVariant      * /*param*/,
                                 gpointer        gself)
{
    static_cast<Actions*>(gself)->open_phone_settings();
}

void on_phone_clock_activated(GSimpleAction * /*action*/,
                              GVariant      * /*param*/,
                              gpointer        gself)
{
    static_cast<Actions*>(gself)->open_phone_clock_app();
}

void on_activate_appointment(GSimpleAction * /*action*/,
                             GVariant      * param,
                             gpointer        gself)
{
    const auto uid = g_variant_get_string(param, nullptr);
    auto self = static_cast<Actions*>(gself);

    g_return_if_fail(uid && *uid);

    // find url of the upcoming appointment with this uid
    for (auto& appt : self->state()->planner->upcoming.get())
    {
        if (appt.uid == uid)
        {
            const auto url = appt.url;
            g_debug("%s: uid[%s] -> url[%s]", G_STRFUNC, uid, url.c_str());
            self->open_appointment(url);
            break;
        }
    }
}

void on_activate_planner(GSimpleAction * /*action*/,
                         GVariant      * param,
                         gpointer        gself)
{
    const auto at = g_variant_get_int64(param);
    auto self = static_cast<Actions*>(gself);

    if (at)
    {
        auto gdt = g_date_time_new_from_unix_local(at);
        self->open_planner_at(DateTime(gdt));
        g_date_time_unref(gdt);
    }
    else // no time specified...
    {
        self->open_planner();
    }
}

void on_set_location(GSimpleAction * /*action*/,
                     GVariant      * param,
                     gpointer        gself)
{
    char * zone;
    char * name;
    split_settings_location(g_variant_get_string(param, nullptr), &zone, &name);
    static_cast<Actions*>(gself)->set_location(zone, name);
    g_free(name);
    g_free(zone);
}

static void on_calendar_activated(GSimpleAction * /*action*/,
                                  GVariant      * state,
                                  gpointer        gself)
{
    const time_t t = g_variant_get_int64(state);

    g_return_if_fail(t != 0);

    static_cast<Actions*>(gself)->set_calendar_date(DateTime(t));
}

GVariant* create_default_header_state()
{
    GVariantBuilder b;
    g_variant_builder_init(&b, G_VARIANT_TYPE_VARDICT);
    g_variant_builder_add(&b, "{sv}", "accessible-desc", g_variant_new_string("accessible-desc"));
    g_variant_builder_add(&b, "{sv}", "label", g_variant_new_string("label"));
    g_variant_builder_add(&b, "{sv}", "title", g_variant_new_string("title"));
    g_variant_builder_add(&b, "{sv}", "visible", g_variant_new_boolean(true));
    return g_variant_builder_end(&b);
}

GVariant* create_calendar_state(const std::shared_ptr<State>& state)
{
    gboolean days[32] = { 0 };
    for(const auto& appt : state->planner->thisMonth.get())
        days[appt.begin.day_of_month()] = true;

    GVariantBuilder day_builder;
    g_variant_builder_init(&day_builder, G_VARIANT_TYPE("ai"));
    for (guint i=0; i<G_N_ELEMENTS(days); i++)
        if (days[i])
            g_variant_builder_add(&day_builder, "i", i);

    GVariantBuilder dict_builder;
    g_variant_builder_init(&dict_builder, G_VARIANT_TYPE_DICTIONARY);

    auto key = "appointment-days";
    auto v = g_variant_builder_end(&day_builder);
    g_variant_builder_add(&dict_builder, "{sv}", key, v);

    key = "calendar-day";
    v = g_variant_new_int64(state->planner->time.get().to_unix());
    g_variant_builder_add(&dict_builder, "{sv}", key, v);

    key = "show-week-numbers";
    v = g_variant_new_boolean(state->settings->show_week_numbers.get());
    g_variant_builder_add(&dict_builder, "{sv}", key, v);

    return g_variant_builder_end(&dict_builder);
}
} // unnamed namespace

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

Actions::Actions(const std::shared_ptr<State>& state):
    m_state(state),
    m_actions(g_simple_action_group_new())
{
    GActionEntry entries[] = {
        { "activate-desktop-settings", on_desktop_settings_activated },
        { "activate-phone-settings", on_phone_settings_activated },
        { "activate-phone-clock-app", on_phone_clock_activated },
        { "activate-appointment", on_activate_appointment, "s", nullptr },
        { "activate-planner", on_activate_planner, "x", nullptr },
        { "set-location", on_set_location, "s" }
    };

    g_action_map_add_action_entries(G_ACTION_MAP(m_actions),
                                    entries,
                                    G_N_ELEMENTS(entries),
                                    this);

    // add the header actions
    auto gam = G_ACTION_MAP(m_actions);
    auto v = create_default_header_state();
    auto a = g_simple_action_new_stateful("desktop-header", nullptr, v);
    g_action_map_add_action(gam, G_ACTION(a));
    a = g_simple_action_new_stateful("desktop_greeter-header", nullptr, v);
    g_action_map_add_action(gam, G_ACTION(a));
    a = g_simple_action_new_stateful("phone-header", nullptr, v);
    g_action_map_add_action(gam, G_ACTION(a));
    a = g_simple_action_new_stateful("phone_greeter-header", nullptr, v);
    g_action_map_add_action(gam, G_ACTION(a));

    // add the calendar action
    v = create_calendar_state(state);
    a = g_simple_action_new_stateful("calendar", G_VARIANT_TYPE_INT64, v);
    g_action_map_add_action(gam, G_ACTION(a));
    g_signal_connect(a, "activate", G_CALLBACK(on_calendar_activated), this);

    ///
    ///  Keep our GActionGroup's action's states in sync with m_state
    ///

    m_state->planner->time.changed().connect([this](const DateTime&){
        update_calendar_state();
    });
    m_state->planner->thisMonth.changed().connect([this](const std::vector<Appointment>&){
        update_calendar_state();
    });
    m_state->settings->show_week_numbers.changed().connect([this](bool){
        update_calendar_state();
    });

    // FIXME: rebuild the calendar state when show-week-number changes
}

Actions::~Actions()
{
    g_clear_object(&m_actions);
}

void Actions::update_calendar_state()
{
    g_action_group_change_action_state(action_group(),
                                       "calendar",
                                       create_calendar_state(m_state));
}

void Actions::set_calendar_date(const DateTime& date)
{
    m_state->planner->time.set(date);
}


} // namespace datetime
} // namespace indicator
} // namespace unity