// +build !windows,!darwin,!plan9

// 7 february 2014

package ui

import (
	"unsafe"
)

// #include "gtk_unix.h"
// /* because cgo seems to choke on ... */
// /* parent will be NULL if there is no parent, so this is fine */
// GtkWidget *gtkNewMsgBox(GtkWindow *parent, GtkMessageType type, GtkButtonsType buttons, char *title, char *text)
// {
// 	GtkWidget *k;
// 
// 	k = gtk_message_dialog_new(parent, GTK_DIALOG_MODAL, type, buttons, "%s", (gchar *) title);
// 	if (text != NULL)
// 		gtk_message_dialog_format_secondary_text((GtkMessageDialog *) k, "%s", (gchar *) text);
// 	return k;
// }
import "C"

func _msgBox(parent *Window, primarytext string, secondarytext string, msgtype C.GtkMessageType, buttons C.GtkButtonsType) (result C.gint) {
	ret := make(chan C.gint)
	defer close(ret)
	uitask <- func() {
		var pwin *C.GtkWindow = nil

		// to implement parent, we need to put the GtkMessageDialog into a new window group along with parent
		// a GtkWindow can only be part of one group
		// so we use this to save the parent window group (if there is one) and store the new window group
		// after showing the message box, we restore the previous window group, so future parent == nil can work properly
		// thanks to pbor and mclasen in irc.gimp.net/#gtk+
		var prevgroup *C.GtkWindowGroup = nil
		var newgroup *C.GtkWindowGroup

		if parent != nil {
			pwin = togtkwindow(parent.sysData.widget)
			// we can't remove a window from the "default window group"; otherwise this throws up Gtk-CRITICAL warnings
			if C.gtk_window_has_group(pwin) != C.FALSE {
				prevgroup = C.gtk_window_get_group(pwin)
				C.gtk_window_group_remove_window(prevgroup, pwin)
			}
			newgroup = C.gtk_window_group_new()
			C.gtk_window_group_add_window(newgroup, pwin)
		}

		cprimarytext := C.CString(primarytext)
		defer C.free(unsafe.Pointer(cprimarytext))
		csecondarytext := (*C.char)(nil)
		if secondarytext != "" {
			csecondarytext = C.CString(secondarytext)
			defer C.free(unsafe.Pointer(csecondarytext))
		}
		box := C.gtkNewMsgBox(pwin, msgtype, buttons, cprimarytext, csecondarytext)
		response := C.gtk_dialog_run((*C.GtkDialog)(unsafe.Pointer(box)))
		C.gtk_widget_destroy(box)

		if parent != nil {
			C.gtk_window_group_remove_window(newgroup, pwin)
			C.g_object_unref(C.gpointer(unsafe.Pointer(newgroup)))		// free the group
			if prevgroup != nil {
				C.gtk_window_group_add_window(prevgroup, pwin)
			}		// otherwise it'll go back into the default group on its own
		}

		ret <- response
	}
	return <-ret
}

func msgBox(parent *Window, primarytext string, secondarytext string) {
	_msgBox(parent, primarytext, secondarytext, C.GtkMessageType(C.GTK_MESSAGE_OTHER), C.GtkButtonsType(C.GTK_BUTTONS_OK))
}

func msgBoxError(parent *Window, primarytext string, secondarytext string) {
	_msgBox(parent, primarytext, secondarytext, C.GtkMessageType(C.GTK_MESSAGE_ERROR), C.GtkButtonsType(C.GTK_BUTTONS_OK))
}