// Copyright (c) 2012 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.

#ifndef UI_WEB_DIALOGS_CONSTRAINED_WEB_DIALOG_UI_H_
#define UI_WEB_DIALOGS_CONSTRAINED_WEB_DIALOG_UI_H_

#include "base/compiler_specific.h"
#include "content/public/browser/web_ui_controller.h"
#include "ui/web_dialogs/web_dialogs_export.h"

class ConstrainedWindow;
class Profile;
class TabContents;

namespace content {
class RenderViewHost;
class WebContents;
}

namespace ui {
class WebDialogDelegate;
class WebDialogWebContentsDelegate;

class WEB_DIALOGS_EXPORT ConstrainedWebDialogDelegate {
 public:
  virtual const WebDialogDelegate* GetWebDialogDelegate() const = 0;
  virtual WebDialogDelegate* GetWebDialogDelegate() = 0;

  // Called when the dialog is being closed in response to a "DialogClose"
  // message from WebUI.
  virtual void OnDialogCloseFromWebUI() = 0;

  // If called, on dialog closure, the dialog will release its WebContents
  // instead of destroying it. After which point, the caller will own the
  // released WebContents.
  virtual void ReleaseTabContentsOnDialogClose() = 0;

  // Returns the ConstrainedWindow.
  // TODO: fix this function name and the one below to conform to the style
  // guide (i.e. GetWindow, GetTab).
  virtual ConstrainedWindow* window() = 0;

  // Returns the TabContents owned by the constrained window.
  virtual TabContents* tab() = 0;

 protected:
  virtual ~ConstrainedWebDialogDelegate() {}
};

// ConstrainedWebDialogUI is a facility to show HTML WebUI content
// in a tab-modal constrained dialog.  It is implemented as an adapter
// between an WebDialogUI object and a ConstrainedWindow object.
//
// Since ConstrainedWindow requires platform-specific delegate
// implementations, this class is just a factory stub.
// TODO(thestig) Refactor the platform-independent code out of the
// platform-specific implementations.
class WEB_DIALOGS_EXPORT ConstrainedWebDialogUI
    : public content::WebUIController {
 public:
  explicit ConstrainedWebDialogUI(content::WebUI* web_ui);
  virtual ~ConstrainedWebDialogUI();

  // WebUIController implementation:
  virtual void RenderViewCreated(
      content::RenderViewHost* render_view_host) OVERRIDE;

  // Sets the delegate on the WebContents.
  static void SetConstrainedDelegate(content::WebContents* web_contents,
                                     ConstrainedWebDialogDelegate* delegate);

 protected:
  // Returns the ConstrainedWebDialogDelegate saved with the WebContents.
  // Returns NULL if no such delegate is set.
  ConstrainedWebDialogDelegate* GetConstrainedDelegate();

 private:
  // JS Message Handler
  void OnDialogCloseMessage(const base::ListValue* args);

  DISALLOW_COPY_AND_ASSIGN(ConstrainedWebDialogUI);
};

// Create a constrained HTML dialog. The actual object that gets created
// is a ConstrainedWebDialogDelegate, which later triggers construction of a
// ConstrainedWebDialogUI object.
// |profile| is used to construct the constrained HTML dialog's WebContents.
// |delegate| controls the behavior of the dialog.
// |tab_delegate| is optional, pass one in to use a custom
//                WebDialogWebContentsDelegate with the dialog, or NULL to
//                use the default one. The dialog takes ownership of
//                |tab_delegate|.
// |overshadowed| is the tab being overshadowed by the dialog.
ConstrainedWebDialogDelegate* CreateConstrainedWebDialog(
    Profile* profile,
    WebDialogDelegate* delegate,
    WebDialogWebContentsDelegate* tab_delegate,
    TabContents* overshadowed);

}  // namespace ui

#endif  // UI_WEB_DIALOGS_CONSTRAINED_WEB_DIALOG_UI_H_