#include "dashboard-widget.h"

/**
 * Implementation of list model
 *
 */
struct _DiyaDashboardListModel
{
    GObject parent_instance;
    GList *appinfos;
};

static guint diya_dashboard_list_model_get_n_items(GListModel *list)
{
    DiyaDashboardListModel *self = DIYA_DASHBOARD_LIST_MODEL(list);
    return g_list_length(self->appinfos);
}

static gpointer diya_dashboard_list_model_get_item(GListModel *list, guint position)
{
    DiyaDashboardListModel *self = DIYA_DASHBOARD_LIST_MODEL(list);
    return g_object_ref(g_list_nth_data(self->appinfos, position));
}

static GType diya_dashboard_list_model_get_item_type(GListModel *list)
{
    (void)list; // Unused parameter
    return G_TYPE_APP_INFO;
}

static void diya_dashboard_list_model_interface_init(GListModelInterface *iface)
{
    iface->get_n_items = diya_dashboard_list_model_get_n_items;
    iface->get_item = diya_dashboard_list_model_get_item;
    iface->get_item_type = diya_dashboard_list_model_get_item_type;
}

G_DEFINE_TYPE_WITH_CODE(DiyaDashboardListModel, diya_dashboard_list_model, G_TYPE_OBJECT, G_IMPLEMENT_INTERFACE(G_TYPE_LIST_MODEL, diya_dashboard_list_model_interface_init))

static void diya_dashboard_list_model_finalize(GObject *object)
{
    g_debug("diya_dashboard_list_model_finalize");
    DiyaDashboardListModel *self = DIYA_DASHBOARD_LIST_MODEL(object);
    g_list_free_full(self->appinfos, g_object_unref);
    G_OBJECT_CLASS(diya_dashboard_list_model_parent_class)->finalize(object);
}

static void diya_dashboard_list_model_dispose(GObject *object)
{
    (void)object;
    g_debug("diya_dashboard_list_model_dispose");
    G_OBJECT_CLASS(diya_dashboard_list_model_parent_class)->dispose(object);
}

static void diya_dashboard_list_model_init(DiyaDashboardListModel *self)
{
    self->appinfos = NULL;
}

static void diya_dashboard_list_model_class_init(DiyaDashboardListModelClass *class)
{
    GObjectClass *gobject_class = G_OBJECT_CLASS(class);
    gobject_class->finalize = diya_dashboard_list_model_finalize;
    gobject_class->dispose = diya_dashboard_list_model_dispose;
}

void diya_dashboard_list_model_append(DiyaDashboardListModel *self, GAppInfo *info)
{
    self->appinfos = g_list_append(self->appinfos, g_object_ref(info));
    // self->appinfos = g_list_reverse(self->appinfos);
    g_list_model_items_changed(G_LIST_MODEL(self), g_list_length(self->appinfos) - 1, 0, 1);
}

static gint diya_dashboard_app_info_cmd(GAppInfo *a, GAppInfo *b)
{
    return !g_app_info_equal(a, b);
}

gboolean diya_dashboard_list_model_contain(DiyaDashboardListModel *self, GAppInfo *info)
{
    GList *found = NULL;
    found = g_list_find_custom(self->appinfos, info, (GCompareFunc)diya_dashboard_app_info_cmd);
    return found != NULL;
}

/**
 * Implement of Dashboard widget
 *
 */

struct _DiyaDashboardWidget
{
    DiyaShellWindow parent;
    GtkWidget *revealer;
    GtkWidget *search_entry;
    GtkWidget *app_list_box;
    DiyaDashboardListModel *list_model;
    GtkSortListModel *sort_model;
    GtkFilterListModel *proxy_model;
    GtkSorter *sorter;
    GtkFilter *filter;
    bool active;
};

enum
{
    NO_PROP,
    PROP_ACTIVE,
    N_PROPERTIES
};

static GParamSpec *g_prop[N_PROPERTIES] = {0};

G_DEFINE_TYPE(DiyaDashboardWidget, diya_dashboard_widget, DIYA_TYPE_SHELL_WINDOW)

static void diya_dashboard_widget_dispose(GObject *object)
{
    DiyaDashboardWidget *self = DIYA_DASHBOARD_WIDGET(object);
    g_debug("diya_dashboard_widget_dispose");
    if (self->proxy_model)
    {
        g_object_unref(self->proxy_model);
    }
    // verify if the list model + sorter is also unref
    G_OBJECT_CLASS(diya_dashboard_widget_parent_class)->dispose(object);
}

static void diya_dashboard_app_launch(GtkFlowBox *box, GtkFlowBoxChild *child, gpointer user_data)
{
    (void)box; // Unused parameter
    DiyaDashboardWidget *self = DIYA_DASHBOARD_WIDGET(user_data);
    int current_index = gtk_flow_box_child_get_index(child);
    if (current_index < 0)
    {
        g_warning("Invalid child index: %d", current_index);
        return;
    }
    GAppInfo *app = G_APP_INFO(g_list_model_get_item(G_LIST_MODEL(self->proxy_model), current_index));
    assert(app);
    diya_shell_launch(diya_shell_window_get_shell(DIYA_SHELL_WINDOW(self)), app);
    g_object_set(self, DIYA_PROP_DASHBOARD_ACTIVE, false, NULL);
    g_object_unref(app);
}
static void diya_dashboard_app_icon_clicked(GtkWidget *widget, gpointer user_data)
{
    // relay signal to the GTK_FLOW_BOX_CHILD parent
    g_signal_emit_by_name(gtk_widget_get_parent(widget), "activate", user_data);
}

static GtkWidget *diya_dashboard_create_app_icon_widget(void *item, void *user_data)
{
    (void)user_data; // Unused parameter
    GAppInfo *app_info = G_APP_INFO(item);
    const gchar *name = g_app_info_get_display_name(app_info);
    GIcon *icon = g_app_info_get_icon(app_info);
    GtkWidget *widget = gtk_button_new_with_label(name);
    if (icon)
    {
        g_debug("app_info %s has icon %s", name, g_icon_to_string(icon));
        // gtk_button_set_icon_name(GTK_BUTTON(widget), g_icon_to_string(icon));
    }
    g_signal_connect(widget, "clicked", G_CALLBACK(diya_dashboard_app_icon_clicked), user_data);
    return widget;
}

static int diya_dashboard_app_info_cmp(GAppInfo *a, GAppInfo *b, gpointer user_data)
{
    (void)user_data; // Unused parameter
    const gchar *name_a = g_app_info_get_id(a);
    const gchar *name_b = g_app_info_get_id(b);
    return g_strcmp0(name_a, name_b);
}

static gboolean diya_app_info_filter_func(GAppInfo *app_info, gpointer user_data)
{
    DiyaDashboardWidget *self = DIYA_DASHBOARD_WIDGET(user_data);
    gchar *text = g_utf8_strdown(gtk_editable_get_text(GTK_EDITABLE(self->search_entry)), -1);
    if (strlen(text) == 0)
    {
        g_free(text);
        return true;
    }
    gchar *name = g_utf8_strdown(g_app_info_get_display_name(app_info), -1);
    if(!name)
    {
        g_free(text);
        return false;
    }
    gboolean result =  g_str_has_prefix(name, text);
    g_free(text);
    g_free(name);
    return result;
}

static void diya_dashboard_search_text_changed(GtkEntry *entry, DiyaDashboardWidget *self)
{
    (void)entry; // Unused parameter
    gtk_filter_changed(self->filter, GTK_FILTER_CHANGE_DIFFERENT);
}

static void diya_dashboard_widget_init(DiyaDashboardWidget *self)
{
    g_debug("diya_dashboard_widget_init");
    gtk_widget_init_template(GTK_WIDGET(self));
    self->active = false;

    // int layer shell for window
    gtk_layer_init_for_window(GTK_WINDOW(self));
    // anchor window to all edges
    gtk_layer_set_anchor(GTK_WINDOW(self), GTK_LAYER_SHELL_EDGE_LEFT, true);
    gtk_layer_set_anchor(GTK_WINDOW(self), GTK_LAYER_SHELL_EDGE_RIGHT, true);
    gtk_layer_set_anchor(GTK_WINDOW(self), GTK_LAYER_SHELL_EDGE_TOP, true);
    gtk_layer_set_anchor(GTK_WINDOW(self), GTK_LAYER_SHELL_EDGE_BOTTOM, true);
    gtk_layer_set_namespace(GTK_WINDOW(self), "diya-dashboard");
    // set margin on window
    for (int i = 0; i < GTK_LAYER_SHELL_EDGE_ENTRY_NUMBER; i++)
        gtk_layer_set_margin(GTK_WINDOW(self), i, 0);
    gtk_layer_set_layer(GTK_WINDOW(self), GTK_LAYER_SHELL_LAYER_TOP);
    // gtk_layer_set_keyboard_mode (GTK_WINDOW(self), GTK_LAYER_SHELL_KEYBOARD_MODE_ON_DEMAND);
    //  the top launcher shall be exclusive
    // gtk_layer_auto_exclusive_zone_enable (GTK_WINDOW(self));
    gtk_layer_set_keyboard_mode(GTK_WINDOW(self), GTK_LAYER_SHELL_KEYBOARD_MODE_ON_DEMAND);
    // gtk_widget_set_can_focus(GTK_WIDGET(self), true);
    // gtk_widget_set_name(GTK_WIDGET(dashboard),NAMESPACE);
    // gtk_window_set_default_size(GTK_WINDOW(dashboard), 48, 48);

    // event controller
    // GtkEventController *event_controller = gtk_event_controller_key_new();
    // g_signal_connect(event_controller, "key-pressed", G_CALLBACK(on_diya_dashboard_key_press), self);
    // gtk_widget_add_controller(GTK_WIDGET(self), event_controller);
    self->list_model = g_object_new(DIYA_TYPE_DASHBOARD_LIST_MODEL, NULL);
    self->sorter = GTK_SORTER(gtk_custom_sorter_new((GCompareDataFunc)diya_dashboard_app_info_cmp, NULL, NULL));
    self->sort_model = gtk_sort_list_model_new(G_LIST_MODEL(self->list_model), self->sorter);
    self->filter = GTK_FILTER(gtk_custom_filter_new((GtkCustomFilterFunc)diya_app_info_filter_func, self, NULL));
    self->proxy_model = gtk_filter_list_model_new(G_LIST_MODEL(self->sort_model), self->filter);
    gtk_flow_box_bind_model(GTK_FLOW_BOX(self->app_list_box), G_LIST_MODEL(self->proxy_model), diya_dashboard_create_app_icon_widget, self, NULL);

    gtk_flow_box_set_selection_mode(GTK_FLOW_BOX(self->app_list_box), GTK_SELECTION_SINGLE);
    gtk_flow_box_set_activate_on_single_click(GTK_FLOW_BOX(self->app_list_box), true);
}

static void diya_dashboard_show(DiyaDashboardWidget *self)
{
    gtk_window_present(GTK_WINDOW(self));
    // gtk_widget_set_visible(GTK_WIDGET(self), true);
    gtk_revealer_set_reveal_child(GTK_REVEALER(self->revealer), true);
    gtk_window_set_focus(GTK_WINDOW(self), self->search_entry);
    // gtk_widget_grab_focus( GTK_WIDGET(self->search_entry));
    GList *apps = g_app_info_get_all();
    GList *l;
    for (l = apps; l != NULL; l = l->next)
    {
        GAppInfo *info = l->data;
        if (diya_dashboard_list_model_contain(self->list_model, info))
        {
            continue;
        }
        g_debug("add AppInfo %s", g_app_info_get_id(info));
        diya_dashboard_list_model_append(self->list_model, info);
    }
    g_list_free_full(apps, g_object_unref);
    gtk_sorter_changed(self->sorter, GTK_SORTER_CHANGE_INVERTED);
}

static void diya_dashboard_hide(DiyaDashboardWidget *self)
{
    gtk_revealer_set_reveal_child(GTK_REVEALER(self->revealer), false);
    gtk_widget_set_visible(GTK_WIDGET(self), false);
}

static void diya_dashboard_set_property(GObject *object, guint property_id, const GValue *value, GParamSpec *pspec)
{
    DiyaDashboardWidget *self = DIYA_DASHBOARD_WIDGET(object);

    switch (property_id)
    {
    case PROP_ACTIVE:
    {
        gboolean active = g_value_get_boolean(value);
        if (self->active == active)
        {
            return;
        }
        self->active = active;
        if (self->active)
        {
            diya_dashboard_show(self);
        }
        else
        {
            diya_dashboard_hide(self);
        }
        break;
    }
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
        break;
    }
}

static void diya_dashboard_get_property(GObject *object, guint property_id, GValue *value, GParamSpec *pspec)
{
    DiyaDashboardWidget *self = DIYA_DASHBOARD_WIDGET(object);
    switch (property_id)
    {
    case PROP_ACTIVE:
        g_value_set_boolean(value, self->active);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
        break;
    }
}

static void diya_dashboard_widget_class_init(DiyaDashboardWidgetClass *class)
{
    GObjectClass *gobject_class = G_OBJECT_CLASS(class);
    gobject_class->dispose = diya_dashboard_widget_dispose;
    gobject_class->set_property = diya_dashboard_set_property;
    gobject_class->get_property = diya_dashboard_get_property;

    // DiyaShellWindowClass* base_class = DIYA_SHELL_WINDOW_CLASS(class);
    // base_class->setup = diya_dashboard_widget_setup;

    gtk_widget_class_set_template_from_resource(GTK_WIDGET_CLASS(class), "/dev/iohub/diya/shell/dashboard.ui");
    gtk_widget_class_bind_template_child(GTK_WIDGET_CLASS(class), DiyaDashboardWidget, revealer);
    gtk_widget_class_bind_template_child(GTK_WIDGET_CLASS(class), DiyaDashboardWidget, search_entry);
    gtk_widget_class_bind_template_child(GTK_WIDGET_CLASS(class), DiyaDashboardWidget, app_list_box);

    gtk_widget_class_bind_template_callback(GTK_WIDGET_CLASS(class), diya_dashboard_app_launch);
    gtk_widget_class_bind_template_callback(GTK_WIDGET_CLASS(class), diya_dashboard_search_text_changed);

    gtk_widget_class_set_css_name(GTK_WIDGET_CLASS(class), "diya-dashboard");
    // gtk_widget_class_bind_template_child(GTK_WIDGET_CLASS (class), ExampleAppWindow, stack);
    // gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), search_text_changed);

    g_prop[PROP_ACTIVE] = g_param_spec_boolean(DIYA_PROP_DASHBOARD_ACTIVE, NULL, "Active the dashboard", false, G_PARAM_READWRITE); //

    g_object_class_install_properties(gobject_class, N_PROPERTIES, g_prop);
}

gboolean diya_dashboard_is_active(DiyaDashboardWidget *self)
{
    return self->active;
}