// 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 CONTENT_PUBLIC_TEST_WEB_CONTENTS_TESTER_H_
#define CONTENT_PUBLIC_TEST_WEB_CONTENTS_TESTER_H_

#include <string>

#include "ui/base/page_transition_types.h"

class GURL;

namespace content {

class BrowserContext;
class RenderFrameHost;
class RenderViewHost;
class SiteInstance;
class WebContents;
struct Referrer;

// This interface allows embedders of content/ to write tests that depend on a
// test version of WebContents.  This interface can be retrieved from any
// WebContents that was retrieved via a call to
// RenderViewHostTestHarness::GetWebContents() (directly or indirectly) or
// constructed explicitly via CreateTestWebContents.
//
// Tests within content/ can directly static_cast WebContents objects retrieved
// or created as described above to TestWebContents.
//
// Design note: We considered two alternatives to this separate test interface
// approach:
//
// a) Define a TestWebContents interface that inherits from WebContents, and
// have the concrete TestWebContents inherit from it as well as from
// WebContentsImpl.  This approach was discarded as it introduces a diamond
// inheritance pattern, which means we wouldn't be e.g. able to downcast from
// WebContents to WebContentsImpl using static_cast.
//
// b) Define a TestWebContents interface that inherits from WebContents, and
// have the concrete TestWebContents implement it, using composition of a
// WebContentsImpl to implement most methods.  This approach was discarded as
// there is a fundamental assumption in content/ that a WebContents* can be
// downcast to a WebContentsImpl*, and this wouldn't be true for TestWebContents
// objects.
class WebContentsTester {
 public:
  // Retrieves a WebContentsTester to drive tests of the specified WebContents.
  // As noted above you need to be sure the 'contents' object supports testing,
  // i.e. is either created using one of the Create... functions below, or is
  // retrieved via RenderViewHostTestHarness::GetWebContents().
  static WebContentsTester* For(WebContents* contents);

  // Creates a WebContents enabled for testing.
  static WebContents* CreateTestWebContents(
      BrowserContext* browser_context,
      SiteInstance* instance);

  // Simulates the appropriate RenderView (pending if any, current otherwise)
  // sending a navigate notification for the NavigationController pending entry.
  virtual void CommitPendingNavigation() = 0;

  // Gets the pending RenderFrameHost, if any, for the main frame. For the
  // current RenderFrameHost of the main frame, use WebContents::GetMainFrame().
  // PlzNavigate: When browser side navigation is enabled it returns the
  // speculative RenderFrameHost for the main frame if one exists.
  virtual RenderFrameHost* GetPendingMainFrame() const = 0;

  // Creates a pending navigation to |url|. Also simulates the
  // DidStartProvisionalLoad received from the renderer.  To commit the
  // navigation, callers should use
  // RenderFrameHostTester::SimulateNavigationCommit. Callers can then use
  // RenderFrameHostTester::SimulateNavigationStop to simulate the navigation
  // stop.
  // Note that this function is meant for callers that want to control the
  // timing of navigation events precisely. Other callers should use
  // NavigateAndCommit.
  // PlzNavigate: this does not simulate the DidStartProvisionalLoad from the
  // renderer, as it only should be received after the navigation is ready to
  // commit.
  virtual void StartNavigation(const GURL& url) = 0;

  // Creates a pending navigation to the given URL with the default parameters
  // and then commits the load with a page ID one larger than any seen. This
  // emulates what happens on a new navigation.
  virtual void NavigateAndCommit(const GURL& url) = 0;

  // Sets the loading state to the given value.
  virtual void TestSetIsLoading(bool value) = 0;

  // Simulates the current RVH notifying that it has unloaded so that the
  // pending RVH navigation can proceed.
  // Does nothing if no cross-navigation is pending.
  virtual void ProceedWithCrossSiteNavigation() = 0;

  // Simulates a navigation with the given information.
  //
  // Guidance for calling these:
  // - nav_entry_id should be 0 if simulating a renderer-initiated navigation;
  //   if simulating a browser-initiated one, pass the GetUniqueID() value of
  //   the NavigationController's PendingEntry.
  // - did_create_new_entry should be true if simulating a navigation that
  //   created a new navigation entry; false for history navigations, reloads,
  //   and other navigations that don't affect the history list.
  virtual void TestDidNavigate(RenderFrameHost* render_frame_host,
                               int page_id,
                               int nav_entry_id,
                               bool did_create_new_entry,
                               const GURL& url,
                               ui::PageTransition transition) = 0;
  virtual void TestDidNavigateWithReferrer(RenderFrameHost* render_frame_host,
                                           int page_id,
                                           int nav_entry_id,
                                           bool did_create_new_entry,
                                           const GURL& url,
                                           const Referrer& referrer,
                                           ui::PageTransition transition) = 0;

  // Returns headers that were passed in the previous SaveFrameWithHeaders(...)
  // call.
  virtual const std::string& GetSaveFrameHeaders() = 0;
};

}  // namespace content

#endif  // CONTENT_PUBLIC_TEST_WEB_CONTENTS_TESTER_H_