// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/functional/bind.h"
#include "base/test/scoped_feature_list.h"
#include "build/build_config.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/chrome_content_browser_client.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/common/pref_names.h"
#include "chrome/test/base/in_process_browser_test.h"
#include "chrome/test/base/testing_browser_process.h"
#include "chrome/test/base/ui_test_utils.h"
#include "components/embedder_support/user_agent_utils.h"
#include "components/prefs/pref_service.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/browser_test_utils.h"
#include "net/http/http_request_headers.h"
#include "third_party/blink/public/common/features.h"

namespace policy {

class UserAgentBrowserTest : public InProcessBrowserTest {
 public:
  UserAgentBrowserTest() {
    embedded_test_server()->RegisterRequestMonitor(base::BindRepeating(
        &UserAgentBrowserTest::MonitorUserAgent, base::Unretained(this)));
  }

  void SetUp() override {
    ASSERT_TRUE(embedded_test_server()->Start());
    empty_url_ = embedded_test_server()->GetURL("/empty.html");

    InProcessBrowserTest::SetUp();
  }

  std::string observed_user_agent() { return observered_user_agent_; }

  GURL empty_url() { return empty_url_; }

 private:
  void MonitorUserAgent(const net::test_server::HttpRequest& request) {
    if (request.GetURL() == empty_url()) {
      observered_user_agent_ =
          request.headers.find(net::HttpRequestHeaders::kUserAgent)->second;
    }
  }

  std::string observered_user_agent_;
  base::test::ScopedFeatureList scoped_feature_list_;
  GURL empty_url_;
};

IN_PROC_BROWSER_TEST_F(UserAgentBrowserTest, ReductionPolicyDefault) {
  ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), empty_url()));
  EXPECT_EQ(observed_user_agent(), embedder_support::GetUserAgent());
}

class ReduceUserAgentPlatformBrowserTest : public InProcessBrowserTest {
 public:
  ReduceUserAgentPlatformBrowserTest() = default;

  void SetUp() override {
    std::unique_ptr<base::FeatureList> feature_list(new base::FeatureList);
    feature_list->InitFromCommandLine("ReduceUserAgentMinorVersion", "");
    scoped_feature_list_.InitWithFeatureList(std::move(feature_list));
    InProcessBrowserTest::SetUp();
  }

  content::WebContents* web_contents() const {
    return browser()->tab_strip_model()->GetActiveWebContents();
  }

 private:
  base::test::ScopedFeatureList scoped_feature_list_;
};

IN_PROC_BROWSER_TEST_F(ReduceUserAgentPlatformBrowserTest, NavigatorPlatform) {
#if BUILDFLAG(IS_ANDROID)
  EXPECT_EQ("Linux armv81",
            content::EvalJs(web_contents(), "navigator.platform"));
#elif BUILDFLAG(IS_MAC)
  EXPECT_EQ("MacIntel", content::EvalJs(web_contents(), "navigator.platform"));
#elif BUILDFLAG(IS_WIN)
  EXPECT_EQ("Win32", content::EvalJs(web_contents(), "navigator.platform"));
#else
  EXPECT_EQ("Linux x86_64",
            content::EvalJs(web_contents(), "navigator.platform"));
#endif
}

}  // namespace policy