#include <gtk/gtk.h>
#include <stdio.h>
#include <dirent.h> 

typedef struct{
	GtkApplication *app;
	GtkWidget *window;
	GtkWidget *input;
	GtkWidget* box;
	GtkWidget* grid;
	char dir[256];
} Appdata;

static void buttons (GtkApplication *app, Appdata *data, char *directory);

// remove child(grid buttons)
static void remove_child(Appdata *data){
	gtk_box_remove(data->box,GTK_WIDGET(data->grid));
}

// action on clicked button
static void on_button_clicked(GtkButton *btn, gpointer user_data){
	Appdata *data = (Appdata *)user_data;
	const char *label = gtk_button_get_label(btn);	
	g_print("Button %s clicked\n",label);
	remove_child(data);	
    // get into char directory label of button with previos dir name
	char directory[256];
    snprintf(directory, sizeof(directory), "%s/%s", data->dir,label);
    // save full path
    snprintf(data->dir, sizeof(directory), "%s", directory);
	gtk_editable_set_text(GTK_EDITABLE(data->input), ("%s", data->dir));
    buttons(data->app,data,directory);
}
// gets number of items and return value in arrays
int *check_dir(int *arr, DIR *d, char *directory){
	int i = 0;
	int j = 0;
	struct dirent *dir;
	d = opendir(directory);
	if (d) {
		while ((dir = readdir(d)) != NULL){
			char *name = dir->d_name;
			if (*name == '.'){
				printf("directory starts with . : %s\n", name);
			}
			else{
				i += 1;
				if(i - 10 == 0){
					i = 0;
					j += 1;
				}
				arr[0] = i;
				arr[1] = j;
			}
		}
	}
	return 0;
}
// activates after enter dir in input
void on_entry_activate(GtkEntry *entry, Appdata *data){
	const gchar *user_text;
    GtkTextIter end_iter;
    user_text = gtk_editable_get_text(GTK_EDITABLE(entry));
	snprintf(data->dir, sizeof(data->dir), "%s", user_text);
	remove_child(data);
	buttons(data->app,data,data->dir);
}
// make input line
static void input_dir(Appdata *data){
	data->input = gtk_entry_new();
	gtk_editable_set_text(GTK_EDITABLE(data->input), ("%s", data->dir));
	g_signal_connect(data->input, "activate", G_CALLBACK(on_entry_activate), data);
	g_print("Set input line\n");
	gtk_box_append (GTK_BOX (data->box), data->input);
}

// present buttons
static void buttons (GtkApplication *app, Appdata *data,char *directory){
	int p[2];
	int g;
	int i = 0;
	int j = 0;
	DIR *d;
	struct dirent *dir;
	d = opendir(directory);
	data->grid = gtk_grid_new();
	check_dir(p, d, directory);
	printf("directory: %s\n",directory);
	printf("%i %i\n",p[0],p[1]);
	g = 10;
    while ((dir = readdir(d)) != NULL && i <=p[1] && j < g){
	    if (d) {
	    	char *name = dir->d_name;
	    	if (*name == '.'){
				printf("directory starts with . : %s\n", name);
			}
			else{
				if (i == p[1]){
					printf("i=10 g=p[0]\n");
					g = p[0];
				}
					printf("set directory label: %s\n", name);
					GtkWidget* btn = gtk_button_new();
					gtk_grid_set_row_spacing(GTK_GRID (data->grid), 10);
				    gtk_grid_set_column_spacing(GTK_GRID (data->grid), 10);
				    gtk_grid_set_column_homogeneous(GTK_GRID (data->grid), TRUE);
				    gtk_grid_set_row_homogeneous(GTK_GRID (data->grid), TRUE);
					gtk_button_set_label(GTK_BUTTON(btn),name);
					gtk_grid_attach (GTK_GRID(data->grid), btn, j, i, 1,1);
					gtk_widget_set_halign(btn, GTK_ALIGN_CENTER);
					gtk_widget_set_valign(btn, GTK_ALIGN_CENTER);
					g_signal_connect(btn, "clicked",G_CALLBACK(on_button_clicked),data);
					j++;
					if (j >= 10){
						j = 0;
						i++;
					}
			}
		}
	}
	closedir(d);
	gtk_box_append(GTK_BOX(data->box),data->grid);
}

static void app_activate (GtkApplication *app, gpointer *user_data){
	Appdata *data = (Appdata *)user_data;
    snprintf(data->dir, sizeof(data->dir), "/");	
	// create window if not exist
	if (!data->window){
		data->window = gtk_application_window_new (GTK_APPLICATION(app));
		gtk_window_set_title (GTK_WINDOW (data->window), "File Manager");
		gtk_window_set_default_size (GTK_WINDOW (data->window), 600, 400);
		gtk_window_set_application(GTK_WINDOW(data->window),app);
		gtk_window_set_icon_name(GTK_WINDOW(data->window), "filemanager-icon");
	}
	data->box = gtk_box_new(GTK_ORIENTATION_VERTICAL,10);
	gtk_widget_set_valign(data->box,GTK_ALIGN_START);
	gtk_window_set_child(GTK_WINDOW(data->window),data->box);
	input_dir(data);
	buttons(app,data,data->dir);
	gtk_window_present(GTK_WINDOW(data->window));
	printf("set child and present window %d\n", data->window);
	g_print("Started\n");
}

int main (int argc, char **argv){
	Appdata *data = g_new0(Appdata,1 );
    data->app = gtk_application_new ("fun.kotyara.filemanager", G_APPLICATION_DEFAULT_FLAGS);
    g_signal_connect (data->app, "activate", G_CALLBACK(app_activate),data);
    int status = g_application_run (G_APPLICATION (data->app), argc, argv);
    g_object_unref(data->app);
    g_free(data);
    return status;
}