// 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.

#include "base/basictypes.h"
#include "base/command_line.h"
#include "base/file_path.h"
#include "base/test/test_timeouts.h"
#include "base/utf_string_conversions.h"
#include "chrome/app/chrome_command_ids.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_commands.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/browser_tabstrip.h"
#include "chrome/browser/ui/find_bar/find_notification_details.h"
#include "chrome/browser/ui/tab_contents/tab_contents.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/url_constants.h"
#include "chrome/test/base/in_process_browser_test.h"
#include "chrome/test/base/ui_test_utils.h"
#include "content/public/browser/navigation_controller.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_source.h"
#include "content/public/browser/notification_types.h"
#include "content/public/browser/page_navigator.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/web_contents.h"
#include "googleurl/src/gurl.h"
#include "net/base/net_util.h"
#include "net/test/test_server.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFindOptions.h"

class TabRestoreTest : public InProcessBrowserTest {
 public:
  TabRestoreTest() : InProcessBrowserTest() {
    url1_ = ui_test_utils::GetTestUrl(
        FilePath().AppendASCII("session_history"),
        FilePath().AppendASCII("bot1.html"));
    url2_ = ui_test_utils::GetTestUrl(
        FilePath().AppendASCII("session_history"),
        FilePath().AppendASCII("bot2.html"));
  }

 protected:
  Browser* GetBrowser(int index) {
    CHECK(static_cast<int>(BrowserList::size()) > index);
    return *(BrowserList::begin() + index);
  }

  // Adds tabs to the given browser, all navigated to url1_. Returns
  // the final number of tabs.
  int AddSomeTabs(Browser* browser, int how_many) {
    int starting_tab_count = browser->tab_count();

    for (int i = 0; i < how_many; ++i) {
      ui_test_utils::NavigateToURLWithDisposition(
          browser, url1_, NEW_FOREGROUND_TAB,
          ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
    }
    int tab_count = browser->tab_count();
    EXPECT_EQ(starting_tab_count + how_many, tab_count);
    return tab_count;
  }

  void CloseTab(int index) {
    content::WebContents* new_tab = chrome::GetWebContentsAt(browser(), index);
    content::WindowedNotificationObserver tab_close_observer(
        content::NOTIFICATION_WEB_CONTENTS_DESTROYED,
        content::NotificationService::AllSources());
    chrome::CloseWebContents(browser(), new_tab);
    tab_close_observer.Wait();
  }

  // Uses the undo-close-tab accelerator to undo a close-tab or close-window
  // operation. The newly restored tab is expected to appear in the
  // window at index |expected_window_index|, at the |expected_tabstrip_index|,
  // and to be active. If |expected_window_index| is equal to the number of
  // current windows, the restored tab is expected to be created in a new
  // window (since the index is 0-based).
  void RestoreTab(int expected_window_index,
                  int expected_tabstrip_index) {
    int window_count = static_cast<int>(BrowserList::size());
    ASSERT_GT(window_count, 0);

    bool expect_new_window = (expected_window_index == window_count);

    Browser* browser;
    if (expect_new_window) {
      browser = *(BrowserList::begin());
    } else {
      browser = GetBrowser(expected_window_index);
    }
    int tab_count = browser->tab_count();
    ASSERT_GT(tab_count, 0);

    // Restore the tab.
    content::WindowedNotificationObserver tab_added_observer(
        chrome::NOTIFICATION_TAB_PARENTED,
        content::NotificationService::AllSources());
    content::WindowedNotificationObserver tab_loaded_observer(
        content::NOTIFICATION_LOAD_STOP,
        content::NotificationService::AllSources());
    chrome::RestoreTab(browser);
    tab_added_observer.Wait();
    tab_loaded_observer.Wait();

    if (expect_new_window) {
      int new_window_count = static_cast<int>(BrowserList::size());
      EXPECT_EQ(++window_count, new_window_count);
      browser = GetBrowser(expected_window_index);
    } else {
      EXPECT_EQ(++tab_count, browser->tab_count());
    }

    // Get a handle to the restored tab.
    ASSERT_GT(browser->tab_count(), expected_tabstrip_index);

    // Ensure that the tab and window are active.
    EXPECT_EQ(expected_tabstrip_index, browser->active_index());
  }

  void GoBack(Browser* browser) {
    content::WindowedNotificationObserver observer(
        content::NOTIFICATION_LOAD_STOP,
        content::NotificationService::AllSources());
    chrome::GoBack(browser, CURRENT_TAB);
    observer.Wait();
  }

  void EnsureTabFinishedRestoring(content::WebContents* tab) {
    content::NavigationController* controller = &tab->GetController();
    if (!controller->NeedsReload() && !controller->GetPendingEntry() &&
        !controller->GetWebContents()->IsLoading())
      return;

    content::WindowedNotificationObserver observer(
        content::NOTIFICATION_LOAD_STOP,
        content::Source<content::NavigationController>(controller));
    observer.Wait();
  }

  GURL url1_;
  GURL url2_;

 private:
  DISALLOW_COPY_AND_ASSIGN(TabRestoreTest);
};

// Close the end tab in the current window, then restore it. The tab should be
// in its original position, and active.
IN_PROC_BROWSER_TEST_F(TabRestoreTest, Basic) {
  int starting_tab_count = browser()->tab_count();
  int tab_count = AddSomeTabs(browser(), 1);

  int closed_tab_index = tab_count - 1;
  CloseTab(closed_tab_index);
  EXPECT_EQ(starting_tab_count, browser()->tab_count());

  ASSERT_NO_FATAL_FAILURE(RestoreTab(0, closed_tab_index));

  // And make sure everything looks right.
  EXPECT_EQ(starting_tab_count + 1, browser()->tab_count());
  EXPECT_EQ(closed_tab_index, browser()->active_index());
  EXPECT_EQ(url1_, chrome::GetActiveWebContents(browser())->GetURL());
}

// Close a tab not at the end of the current window, then restore it. The tab
// should be in its original position, and active.
IN_PROC_BROWSER_TEST_F(TabRestoreTest, MiddleTab) {
  int starting_tab_count = browser()->tab_count();
  AddSomeTabs(browser(), 3);

  // Close one in the middle
  int closed_tab_index = starting_tab_count + 1;
  CloseTab(closed_tab_index);
  EXPECT_EQ(starting_tab_count + 2, browser()->tab_count());

  ASSERT_NO_FATAL_FAILURE(RestoreTab(0, closed_tab_index));

  // And make sure everything looks right.
  EXPECT_EQ(starting_tab_count + 3, browser()->tab_count());
  EXPECT_EQ(closed_tab_index, browser()->active_index());
  EXPECT_EQ(url1_, chrome::GetActiveWebContents(browser())->GetURL());
}

// Close a tab, switch windows, then restore the tab. The tab should be in its
// original window and position, and active.
IN_PROC_BROWSER_TEST_F(TabRestoreTest, RestoreToDifferentWindow) {
  int starting_tab_count = browser()->tab_count();
  AddSomeTabs(browser(), 3);

  // Close one in the middle
  int closed_tab_index = starting_tab_count + 1;
  CloseTab(closed_tab_index);
  EXPECT_EQ(starting_tab_count + 2, browser()->tab_count());

  // Create a new browser.
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), GURL(chrome::kChromeUINewTabURL), NEW_WINDOW,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_BROWSER);
  EXPECT_EQ(2u, BrowserList::size());

  // Restore tab into original browser.
  ASSERT_NO_FATAL_FAILURE(RestoreTab(0, closed_tab_index));

  // And make sure everything looks right.
  EXPECT_EQ(starting_tab_count + 3, browser()->tab_count());
  EXPECT_EQ(closed_tab_index, browser()->active_index());
  EXPECT_EQ(url1_, chrome::GetActiveWebContents(browser())->GetURL());
}

// Close a tab, open a new window, close the first window, then restore the
// tab. It should be in a new window.
// If this becomes flaky, use http://crbug.com/14774
IN_PROC_BROWSER_TEST_F(TabRestoreTest, FLAKY_BasicRestoreFromClosedWindow) {
  // Navigate to url1 then url2.
  ui_test_utils::NavigateToURL(browser(), url1_);
  ui_test_utils::NavigateToURL(browser(), url2_);

  // Create a new browser.
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), GURL(chrome::kChromeUINewTabURL), NEW_WINDOW,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_BROWSER);
  EXPECT_EQ(2u, BrowserList::size());

  // Close the final tab in the first browser.
  content::WindowedNotificationObserver window_observer(
      chrome::NOTIFICATION_BROWSER_CLOSED,
      content::NotificationService::AllSources());
  CloseTab(0);
  window_observer.Wait();

  ASSERT_NO_FATAL_FAILURE(RestoreTab(1, 0));

  // Tab should be in a new window.
  Browser* browser = GetBrowser(1);
  content::WebContents* web_contents = chrome::GetActiveWebContents(browser);
  // And make sure the URLs matches.
  EXPECT_EQ(url2_, web_contents->GetURL());
  GoBack(browser);
  EXPECT_EQ(url1_, web_contents->GetURL());
}

// Restore a tab then make sure it doesn't restore again.
IN_PROC_BROWSER_TEST_F(TabRestoreTest, DontLoadRestoredTab) {
  // Add two tabs
  int starting_tab_count = browser()->tab_count();
  AddSomeTabs(browser(), 2);
  ASSERT_EQ(browser()->tab_count(), starting_tab_count + 2);

  // Close one of them.
  CloseTab(0);
  ASSERT_EQ(browser()->tab_count(), starting_tab_count + 1);

  // Restore it.
  ASSERT_NO_FATAL_FAILURE(RestoreTab(0, 0));
  ASSERT_EQ(browser()->tab_count(), starting_tab_count + 2);

  // Make sure that there's nothing else to restore.
  ASSERT_FALSE(chrome::CanRestoreTab(browser()));
}

// Open a window with multiple tabs, close a tab, then close the window.
// Restore both and make sure the tab goes back into the window.
IN_PROC_BROWSER_TEST_F(TabRestoreTest, RestoreWindowAndTab) {
  int starting_tab_count = browser()->tab_count();
  AddSomeTabs(browser(), 3);

  // Close one in the middle
  int closed_tab_index = starting_tab_count + 1;
  CloseTab(closed_tab_index);
  EXPECT_EQ(starting_tab_count + 2, browser()->tab_count());

  // Create a new browser.
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), GURL(chrome::kChromeUINewTabURL), NEW_WINDOW,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_BROWSER);
  EXPECT_EQ(2u, BrowserList::size());

  // Close the first browser.
  content::WindowedNotificationObserver observer(
      chrome::NOTIFICATION_BROWSER_CLOSED,
      content::NotificationService::AllSources());
  chrome::CloseWindow(browser());
  observer.Wait();
  EXPECT_EQ(1u, BrowserList::size());

  // Restore the first window. The expected_tabstrip_index (second argument)
  // indicates the expected active tab.
  ASSERT_NO_FATAL_FAILURE(RestoreTab(1, starting_tab_count + 1));
  Browser* browser = GetBrowser(1);
  EXPECT_EQ(starting_tab_count + 2, browser->tab_count());

  // Restore the closed tab.
  ASSERT_NO_FATAL_FAILURE(RestoreTab(1, closed_tab_index));
  EXPECT_EQ(starting_tab_count + 3, browser->tab_count());
  EXPECT_EQ(url1_, chrome::GetActiveWebContents(browser)->GetURL());
}

// Open a window with two tabs, close both (closing the window), then restore
// both. Make sure both restored tabs are in the same window.
IN_PROC_BROWSER_TEST_F(TabRestoreTest, RestoreIntoSameWindow) {
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), url1_, NEW_FOREGROUND_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
  // Navigate the rightmost one to url2_ for easier identification.
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), url2_, NEW_FOREGROUND_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);

  // Create a new browser.
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), GURL(chrome::kChromeUINewTabURL), NEW_WINDOW,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_BROWSER);
  EXPECT_EQ(2u, BrowserList::size());

  // Close all but one tab in the first browser, left to right.
  while (browser()->tab_count() > 1)
    CloseTab(0);

  // Close the last tab, closing the browser.
  content::WindowedNotificationObserver observer(
      chrome::NOTIFICATION_BROWSER_CLOSED,
      content::NotificationService::AllSources());
  CloseTab(0);
  observer.Wait();
  EXPECT_EQ(1u, BrowserList::size());

  // Restore the last-closed tab into a new window.
  ASSERT_NO_FATAL_FAILURE(RestoreTab(1, 0));
  Browser* browser = GetBrowser(1);
  EXPECT_EQ(1, browser->tab_count());
  EXPECT_EQ(url2_, chrome::GetActiveWebContents(browser)->GetURL());

  // Restore the next-to-last-closed tab into the same window.
  ASSERT_NO_FATAL_FAILURE(RestoreTab(1, 0));
  EXPECT_EQ(2, browser->tab_count());
  EXPECT_EQ(url1_, chrome::GetActiveWebContents(browser)->GetURL());
}

// Tests that a duplicate history entry is not created when we restore a page
// to an existing SiteInstance.  (Bug 1230446)
IN_PROC_BROWSER_TEST_F(TabRestoreTest, RestoreWithExistingSiteInstance) {
  ASSERT_TRUE(test_server()->Start());

  GURL http_url1(test_server()->GetURL("files/title1.html"));
  GURL http_url2(test_server()->GetURL("files/title2.html"));
  int tab_count = browser()->tab_count();

  // Add a tab
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), http_url1, NEW_FOREGROUND_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
  EXPECT_EQ(++tab_count, browser()->tab_count());

  // Navigate to another same-site URL.
  content::WebContents* tab =
      chrome::GetWebContentsAt(browser(), tab_count - 1);
  content::WindowedNotificationObserver observer(
      content::NOTIFICATION_LOAD_STOP,
      content::NotificationService::AllSources());
  static_cast<content::WebContentsDelegate*>(browser())->OpenURLFromTab(
      tab,
      content::OpenURLParams(http_url2, content::Referrer(), CURRENT_TAB,
                             content::PAGE_TRANSITION_TYPED, false));
  observer.Wait();

  // Close the tab.
  CloseTab(1);

  // Create a new tab to the original site.  Assuming process-per-site is
  // enabled, this will ensure that the SiteInstance used by the restored tab
  // will already exist when the restore happens.
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), http_url2, NEW_FOREGROUND_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);

  // Restore the closed tab.
  ASSERT_NO_FATAL_FAILURE(RestoreTab(0, tab_count - 1));

  // And make sure the URLs match.
  EXPECT_EQ(http_url2, chrome::GetActiveWebContents(browser())->GetURL());
  GoBack(browser());
  EXPECT_EQ(http_url1, chrome::GetActiveWebContents(browser())->GetURL());
}

// Tests that the SiteInstances used for entries in a restored tab's history
// are given appropriate max page IDs, even if the renderer for the entry
// already exists.  (Bug 1204135)
IN_PROC_BROWSER_TEST_F(TabRestoreTest,
                       RestoreCrossSiteWithExistingSiteInstance) {
  ASSERT_TRUE(test_server()->Start());

  GURL http_url1(test_server()->GetURL("files/title1.html"));
  GURL http_url2(test_server()->GetURL("files/title2.html"));

  int tab_count = browser()->tab_count();

  // Add a tab
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), http_url1, NEW_FOREGROUND_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
  EXPECT_EQ(++tab_count, browser()->tab_count());

  // Navigate to more URLs, then a cross-site URL.
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), http_url2, CURRENT_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), http_url1, CURRENT_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), url1_, CURRENT_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);

  // Close the tab.
  CloseTab(1);

  // Create a new tab to the original site.  Assuming process-per-site is
  // enabled, this will ensure that the SiteInstance will already exist when
  // the user clicks Back in the restored tab.
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), http_url2, NEW_FOREGROUND_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);

  // Restore the closed tab.
  ASSERT_NO_FATAL_FAILURE(RestoreTab(0, tab_count - 1));

  // And make sure the URLs match.
  EXPECT_EQ(url1_, chrome::GetActiveWebContents(browser())->GetURL());
  GoBack(browser());
  EXPECT_EQ(http_url1, chrome::GetActiveWebContents(browser())->GetURL());

  // Navigating to a new URL should clear the forward list, because the max
  // page ID of the renderer should have been updated when we restored the tab.
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), http_url2, CURRENT_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
  EXPECT_FALSE(chrome::CanGoForward(browser()));
  EXPECT_EQ(http_url2, chrome::GetActiveWebContents(browser())->GetURL());
}

IN_PROC_BROWSER_TEST_F(TabRestoreTest, RestoreWindow) {
  // Create a new window.
  size_t window_count = BrowserList::size();
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), GURL(chrome::kChromeUINewTabURL), NEW_WINDOW,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_BROWSER);
  EXPECT_EQ(++window_count, BrowserList::size());

  // Create two more tabs, one with url1, the other url2.
  int initial_tab_count = browser()->tab_count();
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), url1_, NEW_FOREGROUND_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), url2_, NEW_FOREGROUND_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);

  // Close the window.
  content::WindowedNotificationObserver close_window_observer(
      chrome::NOTIFICATION_BROWSER_CLOSED,
      content::NotificationService::AllSources());
  chrome::CloseWindow(browser());
  close_window_observer.Wait();
  EXPECT_EQ(window_count - 1, BrowserList::size());

  // Restore the window.
  content::WindowedNotificationObserver open_window_observer(
      chrome::NOTIFICATION_BROWSER_OPENED,
      content::NotificationService::AllSources());
  content::WindowedNotificationObserver load_stop_observer(
      content::NOTIFICATION_LOAD_STOP,
      content::NotificationService::AllSources());
  chrome::RestoreTab(*BrowserList::begin());
  open_window_observer.Wait();
  EXPECT_EQ(window_count, BrowserList::size());

  Browser* browser = GetBrowser(1);
  EXPECT_EQ(initial_tab_count + 2, browser->tab_count());
  load_stop_observer.Wait();

  content::WebContents* restored_tab =
      chrome::GetWebContentsAt(browser, initial_tab_count);
  EnsureTabFinishedRestoring(restored_tab);
  EXPECT_EQ(url1_, restored_tab->GetURL());

  restored_tab = chrome::GetWebContentsAt(browser, initial_tab_count + 1);
  EnsureTabFinishedRestoring(restored_tab);
  EXPECT_EQ(url2_, restored_tab->GetURL());
}

// Restore tab with special URL chrome://credits/ and make sure the page loads
// properly after restore. See http://crbug.com/31905.
IN_PROC_BROWSER_TEST_F(TabRestoreTest, RestoreTabWithSpecialURL) {
  // Navigate new tab to a special URL.
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), GURL(chrome::kChromeUICreditsURL), NEW_FOREGROUND_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);

  // Close the tab.
  CloseTab(1);

  // Restore the closed tab.
  ASSERT_NO_FATAL_FAILURE(RestoreTab(0, 1));
  TabContents* tab = chrome::GetTabContentsAt(browser(), 1);
  EnsureTabFinishedRestoring(tab->web_contents());

  // See if content is as expected.
  EXPECT_GT(
      ui_test_utils::FindInPage(tab, ASCIIToUTF16("webkit"), true, false, NULL,
                                NULL),
      0);
}

// Restore tab with special URL in its navigation history, go back to that
// entry and see that it loads properly. See http://crbug.com/31905
IN_PROC_BROWSER_TEST_F(TabRestoreTest, RestoreTabWithSpecialURLOnBack) {
  ASSERT_TRUE(test_server()->Start());

  const GURL http_url(test_server()->GetURL("files/title1.html"));

  // Navigate new tab to a special URL.
  ui_test_utils::NavigateToURLWithDisposition(
      browser(), GURL(chrome::kChromeUICreditsURL), NEW_FOREGROUND_TAB,
      ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);

  // Then navigate to a normal URL.
  ui_test_utils::NavigateToURL(browser(), http_url);

  // Close the tab.
  CloseTab(1);

  // Restore the closed tab.
  ASSERT_NO_FATAL_FAILURE(RestoreTab(0, 1));
  TabContents* tab = chrome::GetTabContentsAt(browser(), 1);
  EnsureTabFinishedRestoring(tab->web_contents());
  ASSERT_EQ(http_url, tab->web_contents()->GetURL());

  // Go back, and see if content is as expected.
  GoBack(browser());
  EXPECT_GT(
      ui_test_utils::FindInPage(tab, ASCIIToUTF16("webkit"), true, false, NULL,
                                NULL),
      0);
}