// 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_UTIL_H_
#define CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_UTIL_H_

#include <memory>
#include <string>

#include "base/callback.h"
#include "chrome/common/extensions/api/tabs.h"
#include "ui/base/window_open_disposition.h"

class Browser;
class ChromeExtensionFunctionDetails;
class GURL;
class TabStripModel;
class UIThreadExtensionFunction;

namespace base {
class DictionaryValue;
class ListValue;
}

namespace content {
class BrowserContext;
class WebContents;
}

namespace gfx {
class Rect;
}

namespace extensions {
class Extension;
class WindowController;

// Provides various utility functions that help manipulate tabs.
class ExtensionTabUtil {
 public:
  enum PopulateTabBehavior {
    kPopulateTabs,
    kDontPopulateTabs,
  };

  enum ScrubTabBehavior {
    kScrubTab,
    kDontScrubTab,
  };

  struct OpenTabParams {
    OpenTabParams();
    ~OpenTabParams();

    bool create_browser_if_needed;
    std::unique_ptr<int> window_id;
    std::unique_ptr<int> opener_tab_id;
    std::unique_ptr<std::string> url;
    std::unique_ptr<bool> active;
    std::unique_ptr<bool> pinned;
    std::unique_ptr<int> index;
  };

  // Platform specific delegate.
  class Delegate {
   public:
    virtual ~Delegate() {}
    // Platform specific scrubbing of tab info for |extension|.
    virtual void ScrubTabForExtension(const Extension* extension,
                                      content::WebContents* contents,
                                      api::tabs::Tab* tab) = 0;
  };

  // Opens a new tab given an extension function |function| and creation
  // parameters |params|. Returns a Tab object if successful, or NULL and
  // optionally sets |error| if an error occurs.
  static base::DictionaryValue* OpenTab(UIThreadExtensionFunction* function,
                                        const OpenTabParams& params,
                                        bool user_gesture,
                                        std::string* error);

  static int GetWindowId(const Browser* browser);
  static int GetWindowIdOfTabStripModel(const TabStripModel* tab_strip_model);
  static int GetTabId(const content::WebContents* web_contents);
  static std::string GetTabStatusText(bool is_loading);
  static int GetWindowIdOfTab(const content::WebContents* web_contents);
  static std::unique_ptr<base::ListValue> CreateTabList(
      const Browser* browser,
      const Extension* extension);

  static Browser* GetBrowserFromWindowID(
      const ChromeExtensionFunctionDetails& details,
      int window_id,
      std::string* error_message);

  // Returns the tabs:: API constant for the window type of the |browser|.
  static std::string GetBrowserWindowTypeText(const Browser& browser);

  // Creates a Tab object (see chrome/common/extensions/api/tabs.json) with
  // information about the state of a browser tab for the given |web_contents|.
  // This will scrub the tab of sensitive data (URL, favicon, title) according
  // to |scrub_tab_behavior| and |extension|'s permissions. A null extension is
  // treated as having no permissions.
  // By default, tab information should always be scrubbed (kScrubTab) for any
  // data passed to any extension.
  static std::unique_ptr<api::tabs::Tab> CreateTabObject(
      content::WebContents* web_contents,
      ScrubTabBehavior scrub_tab_behavior,
      const Extension* extension) {
    return CreateTabObject(web_contents, scrub_tab_behavior, extension, nullptr,
                           -1);
  }
  static std::unique_ptr<api::tabs::Tab> CreateTabObject(
      content::WebContents* web_contents,
      ScrubTabBehavior scrub_tab_behavior,
      const Extension* extension,
      TabStripModel* tab_strip,
      int tab_index);

  // Creates a DictionaryValue representing the window for the given |browser|,
  // and scrubs any privacy-sensitive data that |extension| does not have
  // access to. |populate_tab_behavior| determines whether tabs will be
  // populated in the result.
  // TODO(devlin): Convert this to a api::Windows::Window object.
  static std::unique_ptr<base::DictionaryValue> CreateWindowValueForExtension(
      const Browser& browser,
      const Extension* extension,
      PopulateTabBehavior populate_tab_behavior);

  // Creates a tab MutedInfo object (see chrome/common/extensions/api/tabs.json)
  // with information about the mute state of a browser tab.
  static std::unique_ptr<api::tabs::MutedInfo> CreateMutedInfo(
      content::WebContents* contents);

  // Platform specific logic moved to delegate. This should be set during
  // startup.
  // |delegate| is a singleton instance and is leaked.
  static void SetPlatformDelegate(Delegate* delegate);

  // Removes any privacy-sensitive fields from a Tab object if appropriate,
  // given the permissions of the extension and the tab in question.  The
  // tab object is modified in place.
  static void ScrubTabForExtension(const Extension* extension,
                                   content::WebContents* contents,
                                   api::tabs::Tab* tab);

  // Gets the |tab_strip_model| and |tab_index| for the given |web_contents|.
  static bool GetTabStripModel(const content::WebContents* web_contents,
                               TabStripModel** tab_strip_model,
                               int* tab_index);
  static bool GetDefaultTab(Browser* browser,
                            content::WebContents** contents,
                            int* tab_id);
  // Any out parameter (|browser|, |tab_strip|, |contents|, & |tab_index|) may
  // be NULL and will not be set within the function.
  static bool GetTabById(int tab_id,
                         content::BrowserContext* browser_context,
                         bool incognito_enabled,
                         Browser** browser,
                         TabStripModel** tab_strip,
                         content::WebContents** contents,
                         int* tab_index);

  // Takes |url_string| and returns a GURL which is either valid and absolute
  // or invalid. If |url_string| is not directly interpretable as a valid (it is
  // likely a relative URL) an attempt is made to resolve it. |extension| is
  // provided so it can be resolved relative to its extension base
  // (chrome-extension://<id>/). Using the source frame url would be more
  // correct, but because the api shipped with urls resolved relative to their
  // extension base, we decided it wasn't worth breaking existing extensions to
  // fix.
  static GURL ResolvePossiblyRelativeURL(const std::string& url_string,
                                         const Extension* extension);

  // Returns true if navigating to |url| would kill a page or the browser
  // itself, whether by simulating a crash, browser quit, thread hang, or
  // equivalent. Extensions should be prevented from navigating to such URLs.
  static bool IsKillURL(const GURL& url);

  // Opens a tab for the specified |web_contents|.
  static void CreateTab(std::unique_ptr<content::WebContents> web_contents,
                        const std::string& extension_id,
                        WindowOpenDisposition disposition,
                        const gfx::Rect& initial_rect,
                        bool user_gesture);

  // Executes the specified callback for all tabs in all browser windows.
  static void ForEachTab(
      const base::Callback<void(content::WebContents*)>& callback);

  static WindowController* GetWindowControllerOfTab(
      const content::WebContents* web_contents);

  // Open the extension's options page. Returns true if an options page was
  // successfully opened (though it may not necessarily *load*, e.g. if the
  // URL does not exist). This call to open the options page is iniatiated by
  // the extension via chrome.runtime.openOptionsPage.
  static bool OpenOptionsPageFromAPI(const Extension* extension,
                                     content::BrowserContext* browser_context);

  // Open the extension's options page. Returns true if an options page was
  // successfully opened (though it may not necessarily *load*, e.g. if the
  // URL does not exist).
  static bool OpenOptionsPage(const Extension* extension, Browser* browser);

  // Returns true if the given Browser can report tabs to extensions.
  // Example of Browsers which don't support tabs include apps and devtools.
  static bool BrowserSupportsTabs(Browser* browser);
};

}  // namespace extensions

#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_UTIL_H_