#include <gtk/gtk.h>
#include <gdk/gdk.h>

#include <openmg/chapter.h>
#include <openmg/view/chapter_view.h>
#include <openmg/view/picture.h>
#include <openmg/util/gobject_utility_extensions.h>
#include <openmg/util/string.h>
#include <openmg/backend/readmng.h>

static void
fire_zoom (GtkGestureZoom *zoom,
        gdouble scale,
        gpointer user_data);

typedef struct {
    guint current_page;
    GListModel *pages; 
    GtkPicture *current_picture;
} ChapterVisorData;

static void
image_page_show (GtkWidget *picture, gpointer user_data) {
    GtkWidget *views_leaflet = GTK_WIDGET (user_data);
    GdkPaintable *paintable = gtk_picture_get_paintable (GTK_PICTURE (picture));
    double final_width = 0;
    double final_height = 0;
    guint width = gtk_widget_get_allocated_width
            (views_leaflet);
    gdk_paintable_compute_concrete_size (
                paintable,
                width,
                0,
                gdk_paintable_get_intrinsic_width (paintable),
                gdk_paintable_get_intrinsic_height (paintable),
                &final_width,
                &final_height
            );
    g_object_set_property_int (G_OBJECT (picture),
            "width-request", (int) final_width);
    g_object_set_property_int (G_OBJECT (picture),
            "height-request", (int) final_height);
}

void
setup_chapter_view (MgMangaChapter *chapter, AdwLeaflet *views_leaflet) {
    MgBackendReadmng *readmng = mg_backend_readmng_new ();
    MgUtilString *string_util = mg_util_string_new ();
    GtkBox *chapter_view_container = GTK_BOX (gtk_box_new (GTK_ORIENTATION_VERTICAL, 0));
    GtkScrolledWindow *zoomable_picture_container = GTK_SCROLLED_WINDOW (gtk_scrolled_window_new ());
    GtkGesture *zoom_controller = gtk_gesture_zoom_new ();
    GListModel *pages = mg_backend_readmng_get_chapter_images (readmng, chapter);
    ChapterVisorData *chapter_visor_data = g_malloc (sizeof *chapter_visor_data);
    GtkPicture *current_picture;
    GtkButton *next_button = GTK_BUTTON (gtk_button_new_from_icon_name
            ("go-next-symbolic"));
    GtkButton *previous_button = GTK_BUTTON (gtk_button_new_from_icon_name
            ("go-previous-symbolic"));
    chapter_visor_data->current_page = 0;
    chapter_visor_data->pages = pages;
    const char *url_image_not_owned =
        gtk_string_list_get_string (GTK_STRING_LIST 
                (pages), 0);
    char *url_image = mg_util_string_alloc_string (string_util, strlen (url_image_not_owned));
    mg_util_string_copy_substring (string_util,
            url_image_not_owned, url_image,
            strlen(url_image_not_owned) + 1, 0,
            strlen (url_image_not_owned));

    current_picture = create_picture_from_url
        (url_image, -1);
    g_signal_connect (G_OBJECT (current_picture), "map",
            G_CALLBACK (image_page_show), views_leaflet);
    g_object_set_property_int (G_OBJECT (zoomable_picture_container), "hexpand", 1);
    g_object_set_property_int (G_OBJECT (zoomable_picture_container), "vexpand", 1);
    chapter_visor_data->current_picture =
        current_picture;
    gtk_scrolled_window_set_child (zoomable_picture_container, GTK_WIDGET (current_picture));


    gtk_widget_add_controller (GTK_WIDGET (zoomable_picture_container),
            GTK_EVENT_CONTROLLER (zoom_controller));
    g_signal_connect (G_OBJECT (zoom_controller), "scale-changed", G_CALLBACK (fire_zoom), NULL);

    gtk_box_append (chapter_view_container, GTK_WIDGET (zoomable_picture_container));
    GtkWidget *widget = adw_leaflet_get_adjacent_child
        (views_leaflet, ADW_NAVIGATION_DIRECTION_FORWARD);
    for (;widget;widget = adw_leaflet_get_adjacent_child
            (views_leaflet, ADW_NAVIGATION_DIRECTION_FORWARD)) {
        adw_leaflet_remove (views_leaflet, widget);
    }
    adw_leaflet_append (views_leaflet, GTK_WIDGET (chapter_view_container));
    adw_leaflet_navigate (views_leaflet, ADW_NAVIGATION_DIRECTION_FORWARD);
}

static void
fire_zoom (GtkGestureZoom *zoom,
        gdouble scale,
        gpointer user_data) {
    // Do something. 
}