// +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 */
// static inline 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"

// the actual type of these constants is GtkResponseType but gtk_dialog_run() returns a gint
var dialogResponses = map[C.gint]Response{
	C.GTK_RESPONSE_OK:		OK,
}

// dialog performs the bookkeeping involved for having a GtkDialog behave the way we want.
type dialog struct {
	parent    *Window
	pwin      *C.GtkWindow
	hadgroup  C.gboolean
	prevgroup *C.GtkWindowGroup
	newgroup  *C.GtkWindowGroup
	result    Response
}

func mkdialog(parent *Window) *dialog {
	return &dialog{
		parent: parent,
	}
}

func (d *dialog) prepare() {
	// 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 == dialogWindow can work properly
	// thanks to pbor and mclasen in irc.gimp.net/#gtk+
	if d.parent != dialogWindow {
		d.pwin = togtkwindow(d.parent.sysData.widget)
		d.hadgroup = C.gtk_window_has_group(d.pwin)
		// we can't remove a window from the "default window group"; otherwise this throws up Gtk-CRITICAL warnings
		if d.hadgroup != C.FALSE {
			d.prevgroup = C.gtk_window_get_group(d.pwin)
			C.gtk_window_group_remove_window(d.prevgroup, d.pwin)
		}
		d.newgroup = C.gtk_window_group_new()
		C.gtk_window_group_add_window(d.newgroup, d.pwin)
	}
}

func (d *dialog) cleanup(box *C.GtkWidget) {
	// have to explicitly close the dialog box, otherwise wacky things will happen
	C.gtk_widget_destroy(box)
	if d.parent != dialogWindow {
		C.gtk_window_group_remove_window(d.newgroup, d.pwin)
		C.g_object_unref(C.gpointer(unsafe.Pointer(d.newgroup))) // free the group
		if d.prevgroup != nil {
			C.gtk_window_group_add_window(d.prevgroup, d.pwin)
		} // otherwise it'll go back into the default group on its own
	}
}

func (d *dialog) run(mk func() *C.GtkWidget) {
	d.prepare()
	box := mk()
	r := C.gtk_dialog_run((*C.GtkDialog)(unsafe.Pointer(box)))
	d.cleanup(box)
	d.result = dialogResponses[r]
}

func _msgBox(parent *Window, primarytext string, secondarytext string, msgtype C.GtkMessageType, buttons C.GtkButtonsType) (response Response) {
	d := mkdialog(parent)
	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))
	}
	d.run(func() *C.GtkWidget {
		return C.gtkNewMsgBox(d.pwin, msgtype, buttons, cprimarytext, csecondarytext)
	})
	return d.result
}

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

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