#include <string.h>

#include <gdk-pixbuf/gdk-pixbuf.h>

#include "window_main.h"
#include "walls_ui.h"
#include "db.h"
#include "walls_model.h"

GdkPixbuf *orig_pixbuf = NULL;
gint last_width = 0,
	 last_height = 0,
	 last_pos = 0;

GtkImage *image = NULL;
GtkWidget *layout = NULL;

void on_filetree_selection_changed(GtkTreeSelection *treeselection, gpointer user_data);

inline static void filetree_create_model(GtkTreeView *filetree) {
	GtkTreeModel *tree_model;

	tree_model = GTK_TREE_MODEL(walls_model_new());
	gtk_tree_view_set_model(filetree, GTK_TREE_MODEL(tree_model));
}

inline static void filetree_init(GtkTreeView *filetree) {
	GtkTreeViewColumn *col1, *col2, *col3, *col4;
	GtkCellRenderer *renderer;
	GtkTreeSelection *selection;

	col1 = gtk_tree_view_column_new();
	gtk_tree_view_column_set_title(col1, "Name");
	gtk_tree_view_append_column(filetree, col1);

	col2 = gtk_tree_view_column_new();
	gtk_tree_view_column_set_title(col2, "Size");
	gtk_tree_view_append_column(filetree, col2);

	col3 = gtk_tree_view_column_new();
	gtk_tree_view_column_set_title(col3, "Width");
	gtk_tree_view_append_column(filetree, col3);

	col4 = gtk_tree_view_column_new();
	gtk_tree_view_column_set_title(col4, "Height");
	gtk_tree_view_append_column(filetree, col4);

	renderer = gtk_cell_renderer_text_new();
	gtk_tree_view_column_pack_start(col1, renderer, TRUE);
	gtk_tree_view_column_add_attribute(col1, renderer, "text", 0);

	renderer = gtk_cell_renderer_text_new();
	gtk_tree_view_column_pack_start(col2, renderer, TRUE);
	gtk_tree_view_column_add_attribute(col2, renderer, "text", 1);

	renderer = gtk_cell_renderer_text_new();
	gtk_tree_view_column_pack_start(col3, renderer, TRUE);
	gtk_tree_view_column_add_attribute(col3, renderer, "text", 2);

	renderer = gtk_cell_renderer_text_new();
	gtk_tree_view_column_pack_start(col4, renderer, TRUE);
	gtk_tree_view_column_add_attribute(col4, renderer, "text", 3);

	filetree_create_model(filetree);

	selection = gtk_tree_view_get_selection(filetree);
	g_signal_connect(selection, "changed", G_CALLBACK(on_filetree_selection_changed), filetree);
}

static void resize_pixbuf() {
	GdkPixbuf *pb;
	GdkWindow *window;
	gint win_width, win_height, img_width, img_height, width, height;
	gdouble scalex, scaley, width_ratio, height_ratio, max_ratio;

	window = gtk_widget_get_window(layout);
	gdk_drawable_get_size(window, &win_width, &win_height);
	gtk_layout_set_size(GTK_LAYOUT(layout), win_width, win_height);
	img_width = gdk_pixbuf_get_width(orig_pixbuf);
	img_height = gdk_pixbuf_get_height(orig_pixbuf);

	/* do we need to resize? */
	if(img_width > win_width || img_height > win_height) {
		/* resize by width */
		width_ratio = (gdouble)img_width / (gdouble)win_width;
		height_ratio = (gdouble)img_height / (gdouble)win_height;
		if(width_ratio > height_ratio) {
			width = win_width;
			height = (gint)(1.0 / width_ratio * img_height);
			scalex = (gdouble)width / (gdouble)img_width;
			scaley = (gdouble)height / (gdouble)img_height;
		} else { /* resize by height */
			height = win_height;
			width = (gint)(1.0 / height_ratio * img_width);
			scalex = (gdouble)width / (gdouble)img_width;
			scaley = (gdouble)height / (gdouble)img_height;
		}
		pb = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, width, height);
		gdk_pixbuf_scale(orig_pixbuf, pb, 0, 0, width, height, 0, 0, scalex, scaley, GDK_INTERP_BILINEAR);
	} else {
		width = img_width;
		height = img_height;
		pb = gdk_pixbuf_copy(orig_pixbuf);
	}

	gtk_widget_set_size_request(GTK_WIDGET(image), width, height);
	gtk_widget_set_uposition(GTK_WIDGET(image), (width < win_width ? win_width / 2 - width / 2 : 0), (height < win_height ? win_height / 2 - height / 2 : 0));
	gtk_image_set_from_pixbuf(image, pb);
	gdk_pixbuf_unref(pb);
}

void on_window_size_allocate(GtkWidget *widget, GtkAllocation *allocation, gpointer user_data) {
	if(orig_pixbuf && (allocation->width != last_width || allocation->height != last_height)) {
		resize_pixbuf();
		last_width = allocation->width;
		last_height = allocation->height;
	}
}

void on_window_hpane_resized(GObject *gobject, GParamSpec *pspec, gpointer user_data) {
	gint pos;

	pos = gtk_paned_get_position(GTK_PANED(gobject));
	if(orig_pixbuf && pos != last_pos) {
		resize_pixbuf();
		last_pos = pos;
	}
}

static void load_pixbuf(struct wallpaper_t *wall) {
	GdkPixbuf *pb;
	GError *error = NULL;
	GdkWindow *window;
	gint win_width, win_height, img_width, img_height, width, height;
	gdouble scalex, scaley, width_ratio, height_ratio, max_ratio;

	if(orig_pixbuf)
		gdk_pixbuf_unref(orig_pixbuf);
	orig_pixbuf = gdk_pixbuf_new_from_file(wall->filepath, &error);
	if(!orig_pixbuf) {
		g_warning("%s", error->message);
		g_free(error);
		return;
	}

	resize_pixbuf();
}

void on_filetree_selection_changed(GtkTreeSelection *treeselection, gpointer user_data) {
	GtkTreeModel *model;
	GtkTreeIter iter;
	struct wallpaper_t *wall;

	if(gtk_tree_selection_get_selected(treeselection, &model, &iter)) {
		if(walls_model_get_record_type(model, &iter) == WALLS_MODEL_TYPE_WALL) {
			walls_model_get_wall_record(model, &iter, &wall);
			load_pixbuf(wall);
		}
	}
}

int gui_main(int argc, char **argv) {
	GtkWidget *window;
	GtkWidget *filetree;
	GtkWidget *window_hpane;
	GtkBuilder *builder ;
	GError *error = NULL;

	if(!db_open())
		return 1;

	gtk_init(&argc, &argv);

	builder = gtk_builder_new();
	if(!gtk_builder_add_from_string(builder, ui_string, -1, &error)) {
		g_warning("%s", error->message);
		g_free(error);
		return 1;
	}

	window = GTK_WIDGET(gtk_builder_get_object(builder, "window"));
	gtk_window_set_title(GTK_WINDOW(window), "walls");

	filetree = GTK_WIDGET(gtk_builder_get_object(builder, "filetree"));
	filetree_init(GTK_TREE_VIEW(filetree));

	image = GTK_IMAGE(gtk_builder_get_object(builder, "image"));
	layout = GTK_WIDGET(gtk_builder_get_object(builder, "layout"));
	window_hpane = GTK_WIDGET(gtk_builder_get_object(builder, "window_hpane"));
	g_signal_connect(window_hpane, "notify::position", G_CALLBACK(on_window_hpane_resized), window_hpane);

	gtk_builder_connect_signals(builder, NULL);
	
	g_object_unref(G_OBJECT(builder));

	gtk_widget_show_all(window);

	gtk_main();

	db_close();

	return 0;
}