// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/input_window_dialog.h"

#include <gtk/gtk.h>

#include "base/message_loop.h"
#include "base/scoped_ptr.h"
#include "base/string_piece.h"
#include "base/utf_string_conversions.h"
#include "chrome/browser/gtk/gtk_util.h"

class GtkInputWindowDialog : public InputWindowDialog {
 public:
  // Creates a dialog. Takes ownership of |delegate|.
  GtkInputWindowDialog(GtkWindow* parent,
                       const std::string& window_title,
                       const std::string& label,
                       const std::string& contents,
                       Delegate* delegate);
  virtual ~GtkInputWindowDialog();

  virtual void Show();
  virtual void Close();

 private:
  static void OnEntryChanged(GtkEditable* entry,
                             GtkInputWindowDialog* window);

  static void OnResponse(GtkDialog* dialog, int response_id,
                         GtkInputWindowDialog* window);

  static gboolean OnWindowDeleteEvent(GtkWidget* widget,
                                      GdkEvent* event,
                                      GtkInputWindowDialog* dialog);

  static void OnWindowDestroy(GtkWidget* widget, GtkInputWindowDialog* dialog);

  // The underlying gtk dialog window.
  GtkWidget* dialog_;

  // The GtkEntry in this form.
  GtkWidget* input_;

  // Our delegate. Consumes the window's output.
  scoped_ptr<InputWindowDialog::Delegate> delegate_;
};


GtkInputWindowDialog::GtkInputWindowDialog(GtkWindow* parent,
                                           const std::string& window_title,
                                           const std::string& label,
                                           const std::string& contents,
                                           Delegate* delegate)
    : dialog_(gtk_dialog_new_with_buttons(
                  window_title.c_str(),
                  parent,
                  GTK_DIALOG_MODAL,
                  GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT,
                  GTK_STOCK_OK, GTK_RESPONSE_ACCEPT,
                  NULL)),
      delegate_(delegate) {
  gtk_dialog_set_default_response(GTK_DIALOG(dialog_), GTK_RESPONSE_ACCEPT);
  gtk_dialog_set_has_separator(GTK_DIALOG(dialog_), FALSE);

  GtkWidget* content_area = GTK_DIALOG(dialog_)->vbox;
  gtk_box_set_spacing(GTK_BOX(content_area), 18);

  GtkWidget* hbox = gtk_hbox_new(FALSE, 6);
  GtkWidget* label_widget = gtk_label_new(label.c_str());
  gtk_box_pack_start(GTK_BOX(hbox), label_widget, FALSE, FALSE, 0);

  input_ = gtk_entry_new();
  gtk_entry_set_text(GTK_ENTRY(input_), contents.c_str());
  g_signal_connect(input_, "changed",
                   G_CALLBACK(OnEntryChanged), this);
  g_object_set(G_OBJECT(input_), "activates-default", TRUE, NULL);
  gtk_box_pack_start(GTK_BOX(hbox), input_, TRUE, TRUE, 0);

  gtk_widget_show_all(hbox);

  gtk_box_pack_start(GTK_BOX(content_area), hbox, FALSE, FALSE, 0);

  g_signal_connect(dialog_, "response",
                   G_CALLBACK(OnResponse), this);
  g_signal_connect(dialog_, "delete-event",
                   G_CALLBACK(OnWindowDeleteEvent), this);
  g_signal_connect(dialog_, "destroy",
                   G_CALLBACK(OnWindowDestroy), this);
}

GtkInputWindowDialog::~GtkInputWindowDialog() {
}

void GtkInputWindowDialog::Show() {
  gtk_util::ShowDialog(dialog_);
}

void GtkInputWindowDialog::Close() {
  // Under the model that we've inherited from Windows, dialogs can receive
  // more than one Close() call inside the current message loop event.
  if (dialog_) {
    gtk_widget_destroy(GTK_WIDGET(dialog_));
    dialog_ = NULL;
  }
}

// static
void GtkInputWindowDialog::OnEntryChanged(GtkEditable* entry,
                                          GtkInputWindowDialog* window) {
  std::wstring value(UTF8ToWide(gtk_entry_get_text(GTK_ENTRY(entry))));
  gtk_dialog_set_response_sensitive(GTK_DIALOG(window->dialog_),
                                    GTK_RESPONSE_ACCEPT,
                                    window->delegate_->IsValid(value));
}

// static
void GtkInputWindowDialog::OnResponse(GtkDialog* dialog, int response_id,
                                      GtkInputWindowDialog* window) {
  if (response_id == GTK_RESPONSE_ACCEPT) {
    std::wstring value(UTF8ToWide(gtk_entry_get_text(
                                      GTK_ENTRY(window->input_))));
    window->delegate_->InputAccepted(value);
  } else {
    window->delegate_->InputCanceled();
  }

  window->Close();
}

// static
gboolean GtkInputWindowDialog::OnWindowDeleteEvent(
    GtkWidget* widget,
    GdkEvent* event,
    GtkInputWindowDialog* dialog) {
  dialog->Close();

  // Return true to prevent the gtk dialog from being destroyed. Close will
  // destroy it for us and the default gtk_dialog_delete_event_handler() will
  // force the destruction without us being able to stop it.
  return TRUE;
}

// static
void GtkInputWindowDialog::OnWindowDestroy(GtkWidget* widget,
                                           GtkInputWindowDialog* dialog) {
  MessageLoop::current()->DeleteSoon(FROM_HERE, dialog);
}

// static
InputWindowDialog* InputWindowDialog::Create(gfx::NativeWindow parent,
                                             const std::wstring& window_title,
                                             const std::wstring& label,
                                             const std::wstring& contents,
                                             Delegate* delegate) {
  return new GtkInputWindowDialog(parent,
                                  WideToUTF8(window_title),
                                  WideToUTF8(label),
                                  WideToUTF8(contents),
                                  delegate);
}