// Copyright 2023 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/check.h"
#include "base/files/file_enumerator.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/path_service.h"
#include "chrome/browser/ash/file_manager/path_util.h"
#include "chrome/browser/ash/login/test/session_manager_state_waiter.h"
#include "chrome/browser/ash/scanning/fake_lorgnette_scanner_manager.h"
#include "chrome/browser/ash/scanning/lorgnette_scanner_manager_factory.h"
#include "chrome/browser/ash/scanning/scan_service.h"
#include "chrome/browser/ash/scanning/scan_service_factory.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/test/base/chromeos/crosier/ash_integration_test.h"
#include "chrome/test/base/chromeos/crosier/chromeos_integration_login_mixin.h"
#include "chrome/test/interaction/interactive_browser_test.h"
#include "chromeos/ash/components/browser_context_helper/browser_context_types.h"
#include "chromeos/ash/components/dbus/lorgnette/lorgnette_service.pb.h"
#include "components/keyed_service/core/keyed_service.h"
#include "content/public/browser/browser_context.h"
#include "content/public/test/browser_test.h"
#include "ui/aura/window.h"

namespace ash {

namespace {

constexpr char kScanningUrl[] = "chrome://scanning";

// Scan settings.
constexpr char kFirstTestScannerName[] = "Test Scanner 1";
constexpr char kDocumentSourceName[] = "adf_simplex";
constexpr uint32_t kFirstResolution = 75;
constexpr uint32_t kSecondResolution = 150;

// Kombucha helpers.
constexpr char kClickFn[] = "e => e.click()";

lorgnette::DocumentSource CreateLorgnetteDocumentSource() {
  lorgnette::DocumentSource source;
  source.set_type(lorgnette::SOURCE_ADF_SIMPLEX);
  source.set_name(kDocumentSourceName);
  source.add_color_modes(lorgnette::MODE_GRAYSCALE);
  source.add_resolutions(kFirstResolution);
  source.add_resolutions(kSecondResolution);
  return source;
}

lorgnette::ScannerCapabilities CreateLorgnetteScannerCapabilities() {
  lorgnette::ScannerCapabilities caps;
  *caps.add_sources() = CreateLorgnetteDocumentSource();
  return caps;
}

// Creates a new LorgnetteScannerManager for the given `context`.
std::unique_ptr<KeyedService> BuildLorgnetteScannerManager(
    content::BrowserContext* context) {
  auto manager = std::make_unique<FakeLorgnetteScannerManager>();
  manager->SetGetScannerNamesResponse({kFirstTestScannerName});
  manager->SetGetScannerCapabilitiesResponse(
      CreateLorgnetteScannerCapabilities());
  return manager;
}

class ScanIntegrationTest : public AshIntegrationTest {
 public:
  ScanIntegrationTest() {
    set_exit_when_last_browser_closes(false);
    login_mixin().SetMode(ChromeOSIntegrationLoginMixin::Mode::kTestLogin);
  }

  const DeepQuery kScanButtonQuery{
      "scanning-app",
      "cr-button#scanButton",
  };

  const DeepQuery kScanDoneSectionQuery{
      "scanning-app",
      "scan-done-section",
  };

  const DeepQuery kShowInFolderQuery =
      kScanDoneSectionQuery + "#showInFolderButton";

  const DeepQuery kFileListQuery{
      "#file-list",
  };

  auto LaunchScanningApp() {
    return Do([&]() { CreateBrowserWindow(GURL(kScanningUrl)); });
  }

  base::FilePath GetScannedPdfFilePath() {
    base::FileEnumerator e(
        file_manager::util::GetMyFilesFolderForProfile(GetActiveUserProfile()),
        /*recursive=*/false, base::FileEnumerator::FILES,
        FILE_PATH_LITERAL("*.pdf"));
    const auto file = e.Next();
    // Only one file should exist in the temp directory.
    CHECK(e.Next().empty());
    return file;
  }

  auto WaitForFilesToLoad(const ui::ElementIdentifier& element_id) {
    DEFINE_LOCAL_CUSTOM_ELEMENT_EVENT_TYPE(kFilesLoaded);

    WebContentsInteractionTestUtil::StateChange state_change;
    state_change.type = WebContentsInteractionTestUtil::StateChange::Type::
        kExistsAndConditionTrue;
    state_change.where = kFileListQuery;
    state_change.test_function = "e => e.querySelectorAll('li').length > 0";
    state_change.event = kFilesLoaded;
    return WaitForStateChange(element_id, state_change);
  }

  // Use JS to find the scanned file in the Files app.
  auto VerifyScannedPdfInFilesApp(const ui::ElementIdentifier& element_id) {
    return CheckJsResultAt(
        element_id, kFileListQuery,
        "e => { const files = Array.from(e.querySelectorAll('.entry-name')); "
        "const pdfIndex = files.findIndex(row => { const pattern = "
        "/^scan_.*\\.pdf$/i; return pattern.test(row.innerText)}); return "
        "pdfIndex !== -1; }");
  }
};

// TODO(b:307385730): Add tests that select various scan settings combinations.
IN_PROC_BROWSER_TEST_F(ScanIntegrationTest, ScanWithDefaultSettings) {
  // Set up context for element tracking for InteractiveBrowserTest.
  SetupContextWidget();

  login_mixin().Login();

  // Waits for the primary user session to start.
  ash::test::WaitForPrimaryUserSessionStart();

  // Ensure the Scanning system web app (SWA) is installed.
  InstallSystemApps();
  DEFINE_LOCAL_ELEMENT_IDENTIFIER_VALUE(kScanAppWebContentsId);
  DEFINE_LOCAL_ELEMENT_IDENTIFIER_VALUE(kFilesAppId);
  base::ScopedAllowBlockingForTesting allow_io;

  LorgnetteScannerManagerFactory::GetInstance()->SetTestingFactory(
      GetActiveUserProfile(),
      base::BindRepeating(&BuildLorgnetteScannerManager));

  RunTestSequence(
      InstrumentNextTab(kScanAppWebContentsId, AnyBrowser()),
      Log("Launching Scanning app"), LaunchScanningApp(),
      Log("Waiting for Scanning app to load"),
      WaitForWebContentsReady(kScanAppWebContentsId, GURL(kScanningUrl)),
      Log("Clicking scan button"),
      InAnyContext(EnsurePresent(kScanAppWebContentsId, kScanButtonQuery)),
      ExecuteJsAt(kScanAppWebContentsId, kScanButtonQuery, kClickFn),
      WaitForElementExists(kScanAppWebContentsId, kScanDoneSectionQuery),
      WaitForElementExists(kScanAppWebContentsId, kShowInFolderQuery),
      InstrumentNextTab(kFilesAppId, AnyBrowser()),
      Log("Clicking the Show in Folder button"),
      ClickElement(kScanAppWebContentsId, kShowInFolderQuery),
      WaitForShow(kFilesAppId),
      Log("Waiting for files to load in the File app"),
      WaitForFilesToLoad(kFilesAppId),
      Log("Verifying the scanned PDF is available"),
      VerifyScannedPdfInFilesApp(kFilesAppId));
  // PDFs do not have stable contents (e.g. metadata changes), so do not
  // compare to a golden file. If the file was written, we assume its
  // contents are valid.
  EXPECT_TRUE(base::PathExists(GetScannedPdfFilePath()));
}

}  // namespace

}  // namespace ash