// 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 "components/search_engines/template_url_fetcher.h"

#include <stddef.h>

#include <memory>
#include <string>
#include <utility>

#include "base/callback_helpers.h"
#include "base/files/file_util.h"
#include "base/macros.h"
#include "base/memory/ptr_util.h"
#include "base/path_service.h"
#include "base/run_loop.h"
#include "base/strings/utf_string_conversions.h"
#include "chrome/browser/search_engines/template_url_service_test_util.h"
#include "chrome/test/base/testing_profile.h"
#include "components/search_engines/template_url.h"
#include "components/search_engines/template_url_service.h"
#include "content/public/test/test_browser_thread_bundle.h"
#include "net/test/embedded_test_server/embedded_test_server.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "url/gurl.h"

namespace {

using base::ASCIIToUTF16;

class TestTemplateUrlFetcher : public TemplateURLFetcher {
 public:
  TestTemplateUrlFetcher(TemplateURLService* template_url_service,
                         net::URLRequestContextGetter* request_context,
                         const base::Closure& request_completed_callback)
      : TemplateURLFetcher(template_url_service, request_context),
        callback_(request_completed_callback) {}
  ~TestTemplateUrlFetcher() override {}

 protected:
  void RequestCompleted(RequestDelegate* request) override {
    callback_.Run();
    TemplateURLFetcher::RequestCompleted(request);
  }

 private:
  // Callback to be run when a request completes.
  base::Closure callback_;

  DISALLOW_COPY_AND_ASSIGN(TestTemplateUrlFetcher);
};

// Basic set-up for TemplateURLFetcher tests.
class TemplateURLFetcherTest : public testing::Test {
 public:
  TemplateURLFetcherTest();

  void SetUp() override {
    TestingProfile* profile = test_util_.profile();
    ASSERT_TRUE(profile->GetRequestContext());
    template_url_fetcher_.reset(new TestTemplateUrlFetcher(
        test_util_.model(), profile->GetRequestContext(),
        base::Bind(&TemplateURLFetcherTest::RequestCompletedCallback,
                   base::Unretained(this))));

    ASSERT_TRUE(test_server_.Start());
  }

  void TearDown() override {
    ASSERT_TRUE(test_server_.ShutdownAndWaitUntilComplete());
  }

  // Called when a request completes.
  void RequestCompletedCallback();

  // Schedules the download of the url.
  void StartDownload(const base::string16& keyword,
                     const std::string& osdd_file_name,
                     bool check_that_file_exists);

  // Waits for any downloads to finish.
  void WaitForDownloadToFinish();

  TemplateURLServiceTestUtil* test_util() { return &test_util_; }
  TemplateURLFetcher* template_url_fetcher() {
    return template_url_fetcher_.get();
  }
  int requests_completed() const { return requests_completed_; }

 private:
  content::TestBrowserThreadBundle thread_bundle_;  // To set up BrowserThreads.
  TemplateURLServiceTestUtil test_util_;
  std::unique_ptr<TemplateURLFetcher> template_url_fetcher_;
  net::EmbeddedTestServer test_server_;

  // How many TemplateURKFetcher::RequestDelegate requests have completed.
  int requests_completed_;

  // Is the code in WaitForDownloadToFinish in a message loop waiting for a
  // callback to finish?
  bool waiting_for_download_;

 private:
  DISALLOW_COPY_AND_ASSIGN(TemplateURLFetcherTest);
};

bool GetTestDataDir(base::FilePath* dir) {
  if (!PathService::Get(base::DIR_SOURCE_ROOT, dir))
    return false;
  *dir = dir->AppendASCII("components")
             .AppendASCII("test")
             .AppendASCII("data")
             .AppendASCII("search_engines");
  return true;
}

TemplateURLFetcherTest::TemplateURLFetcherTest()
    : thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP),
      requests_completed_(0),
      waiting_for_download_(false) {
  base::FilePath test_data_dir;
  CHECK(GetTestDataDir(&test_data_dir));
  test_server_.ServeFilesFromDirectory(test_data_dir);
}

void TemplateURLFetcherTest::RequestCompletedCallback() {
  requests_completed_++;
  if (waiting_for_download_)
    base::RunLoop::QuitCurrentWhenIdleDeprecated();
}

void TemplateURLFetcherTest::StartDownload(
    const base::string16& keyword,
    const std::string& osdd_file_name,
    bool check_that_file_exists) {
  if (check_that_file_exists) {
    base::FilePath osdd_full_path;
    ASSERT_TRUE(GetTestDataDir(&osdd_full_path));
    osdd_full_path = osdd_full_path.AppendASCII(osdd_file_name);
    ASSERT_TRUE(base::PathExists(osdd_full_path));
    ASSERT_FALSE(base::DirectoryExists(osdd_full_path));
  }

  // Start the fetch.
  GURL osdd_url = test_server_.GetURL("/" + osdd_file_name);
  GURL favicon_url;
  template_url_fetcher_->ScheduleDownload(
      keyword, osdd_url, favicon_url,
      TemplateURLFetcher::URLFetcherCustomizeCallback());
}

void TemplateURLFetcherTest::WaitForDownloadToFinish() {
  ASSERT_FALSE(waiting_for_download_);
  waiting_for_download_ = true;
  base::RunLoop().Run();
  waiting_for_download_ = false;
}

TEST_F(TemplateURLFetcherTest, BasicAutodetectedTest) {
  base::string16 keyword(ASCIIToUTF16("test"));

  test_util()->ChangeModelToLoadState();
  ASSERT_FALSE(test_util()->model()->GetTemplateURLForKeyword(keyword));

  std::string osdd_file_name("simple_open_search.xml");
  StartDownload(keyword, osdd_file_name, true);
  EXPECT_EQ(0, requests_completed());

  WaitForDownloadToFinish();
  EXPECT_EQ(1, requests_completed());

  const TemplateURL* t_url = test_util()->model()->GetTemplateURLForKeyword(
      keyword);
  ASSERT_TRUE(t_url);
  EXPECT_EQ(ASCIIToUTF16("http://example.com/%s/other_stuff"),
            t_url->url_ref().DisplayURL(
                test_util()->model()->search_terms_data()));
  EXPECT_EQ(ASCIIToUTF16("Simple Search"), t_url->short_name());
  EXPECT_TRUE(t_url->safe_for_autoreplace());
}

// This test is similar to the BasicAutodetectedTest except the xml file
// provided doesn't include a short name for the search engine.  We should
// fall back to the hostname.
TEST_F(TemplateURLFetcherTest, InvalidShortName) {
  base::string16 keyword(ASCIIToUTF16("test"));

  test_util()->ChangeModelToLoadState();
  ASSERT_FALSE(test_util()->model()->GetTemplateURLForKeyword(keyword));

  std::string osdd_file_name("simple_open_search_no_name.xml");
  StartDownload(keyword, osdd_file_name, true);
  WaitForDownloadToFinish();

  const TemplateURL* t_url =
      test_util()->model()->GetTemplateURLForKeyword(keyword);
  ASSERT_TRUE(t_url);
  EXPECT_EQ(ASCIIToUTF16("example.com"), t_url->short_name());
}

TEST_F(TemplateURLFetcherTest, DuplicatesThrownAway) {
  base::string16 keyword(ASCIIToUTF16("test"));

  test_util()->ChangeModelToLoadState();
  ASSERT_FALSE(test_util()->model()->GetTemplateURLForKeyword(keyword));

  std::string osdd_file_name("simple_open_search.xml");
  StartDownload(keyword, osdd_file_name, true);
  EXPECT_EQ(0, requests_completed());

  struct {
    std::string description;
    std::string osdd_file_name;
    base::string16 keyword;
  } test_cases[] = {
      {"Duplicate osdd url with autodetected provider.", osdd_file_name,
       keyword + ASCIIToUTF16("1")},
      {"Duplicate keyword with autodetected provider.", osdd_file_name + "1",
       keyword},
  };

  for (size_t i = 0; i < arraysize(test_cases); ++i) {
    StartDownload(test_cases[i].keyword, test_cases[i].osdd_file_name, false);
    EXPECT_EQ(1, template_url_fetcher()->requests_count())
        << test_cases[i].description;
  }

  WaitForDownloadToFinish();
  EXPECT_EQ(1, requests_completed());
}

TEST_F(TemplateURLFetcherTest, AutodetectedBeforeLoadTest) {
  base::string16 keyword(ASCIIToUTF16("test"));
  EXPECT_FALSE(test_util()->model()->GetTemplateURLForKeyword(keyword));

  // This should bail because the model isn't loaded yet.
  std::string osdd_file_name("simple_open_search.xml");
  StartDownload(keyword, osdd_file_name, true);
  EXPECT_EQ(0, template_url_fetcher()->requests_count());
  EXPECT_EQ(0, requests_completed());
}

TEST_F(TemplateURLFetcherTest, DuplicateKeywordsTest) {
  base::string16 keyword(ASCIIToUTF16("test"));
  TemplateURLData data;
  data.SetShortName(keyword);
  data.SetKeyword(keyword);
  data.SetURL("http://example.com/");
  test_util()->model()->Add(base::MakeUnique<TemplateURL>(data));
  test_util()->ChangeModelToLoadState();

  EXPECT_TRUE(test_util()->model()->GetTemplateURLForKeyword(keyword));

  // This should bail because the keyword already exists.
  std::string osdd_file_name("simple_open_search.xml");
  StartDownload(keyword, osdd_file_name, true);
  EXPECT_EQ(0, template_url_fetcher()->requests_count());
  EXPECT_EQ(0, requests_completed());
}

TEST_F(TemplateURLFetcherTest, DuplicateDownloadTest) {
  test_util()->ChangeModelToLoadState();

  base::string16 keyword(ASCIIToUTF16("test"));
  std::string osdd_file_name("simple_open_search.xml");
  StartDownload(keyword, osdd_file_name, true);
  EXPECT_EQ(1, template_url_fetcher()->requests_count());
  EXPECT_EQ(0, requests_completed());

  // This should bail because the keyword already has a pending download.
  StartDownload(keyword, osdd_file_name, true);
  EXPECT_EQ(1, template_url_fetcher()->requests_count());
  EXPECT_EQ(0, requests_completed());

  WaitForDownloadToFinish();
  EXPECT_EQ(1, requests_completed());
}

TEST_F(TemplateURLFetcherTest, UnicodeTest) {
  base::string16 keyword(ASCIIToUTF16("test"));

  test_util()->ChangeModelToLoadState();
  ASSERT_FALSE(test_util()->model()->GetTemplateURLForKeyword(keyword));

  std::string osdd_file_name("unicode_open_search.xml");
  StartDownload(keyword, osdd_file_name, true);
  WaitForDownloadToFinish();
  const TemplateURL* t_url =
      test_util()->model()->GetTemplateURLForKeyword(keyword);
  EXPECT_EQ(base::UTF8ToUTF16("\xd1\x82\xd0\xb5\xd1\x81\xd1\x82"),
            t_url->short_name());
}

}  // namespace