// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_UI_PROFILES_PROFILE_PICKER_H_
#define CHROME_BROWSER_UI_PROFILES_PROFILE_PICKER_H_

#include <optional>
#include <variant>

#include "base/files/file_path.h"
#include "base/functional/callback.h"
#include "base/functional/callback_forward.h"
#include "base/time/time.h"
#include "build/buildflag.h"
#include "components/signin/public/base/signin_buildflags.h"
#include "third_party/skia/include/core/SkColor.h"
#include "url/gurl.h"

class GURL;
class Profile;

namespace views {
class View;
class WebView;
}  // namespace views

enum class StartupProfileMode;
class ForceSigninUIError;

class ProfilePicker {
 public:
  // This is used for logging, so do not remove or reorder existing entries.
  enum class FirstRunExitStatus {
    // The user completed the FRE and is continuing to launch the browser.
    kCompleted = 0,

    // `kQuitEarly = 1` used to be a lacros-only status. It has been removed
    // but in order to keep backward compatibility, its value has been retired.

    // The user finished the mandatory FRE steps but abandoned their task
    // (closed the browser app).
    kQuitAtEnd = 2,

    // The user opens the first run again while it's still running.
    kAbortTask = 3,

    // The user does something that bypasses the FRE (opens new window etc..).
    kAbandonedFlow = 4,

    // Add any new values above this one, and update kMaxValue to the highest
    // enumerator value.
    kMaxValue = kAbandonedFlow
  };
  using FirstRunExitedCallback =
      base::OnceCallback<void(FirstRunExitStatus status)>;

  // Only work when passed as the argument 'on_select_profile_target_url' to
  // ProfilePicker::Show.
  static const char kTaskManagerUrl[];

  // An entry point that triggers the profile picker window to open.
  // These values are persisted to logs. Entries should not be renumbered and
  // numeric values should never be reused.
  //
  // LINT.IfChange(EntryPoint)
  enum class EntryPoint {
    kOnStartup = 0,
    kProfileMenuManageProfiles = 1,
    kProfileMenuAddNewProfile = 2,
    kOpenNewWindowAfterProfileDeletion = 3,
    // A new session was started while Chrome was already running (e.g. by
    // clicking on the tray icon on Windows).
    kNewSessionOnExistingProcess = 4,
    kProfileLocked = 5,
    kUnableToCreateBrowser = 6,
    kBackgroundModeManager = 7,

    // `8` and `9` used to be lacros-only entry points. They has been removed
    // but in order to keep backward compatibility, their values have been
    // retired.

    // The Profile became idle, due to the IdleProfileCloseTimeout policy.
    kProfileIdle = 10,
    // Opens the first run experience on desktop platforms to let the
    // user sign in, opt in to sync, etc.
    kFirstRun = 11,
    // There was no usable profile on startup (e.g. the profiles were locked by
    // force signin).
    kOnStartupNoProfile = 12,
    // There was no usable profile when starting a new session while Chrome is
    // already running (e.g. the profiles were locked by force signin).
    kNewSessionOnExistingProcessNoProfile = 13,
    // Opens manage profile view from the app menu.
    kAppMenuProfileSubMenuManageProfiles = 14,
    // Opens the add new profile view from the app menu.
    kAppMenuProfileSubMenuAddNewProfile = 15,

    // Opens the Glic version of the Profile Picker
    kGlicManager = 16,

    // Opens the profile picker on startup, and creates a profile with an email
    // address.
    kOnStartupCreateProfileWithEmail = 17,

    // Opens the Omnibox Everywhere version of the Profile Picker.
    kOmniboxEverywhere = 18,

    kMaxValue = kOmniboxEverywhere,
  };
  // LINT.ThenChange(/tools/metrics/histograms/metadata/profile/enums.xml:ProfilePickerEntryPoint)

  class Params final {
   public:
    // Basic constructors and operators.
    ~Params();
    Params(Params&&);
    Params& operator=(Params&&);

    Params(const Params&) = delete;
    Params& operator=(const Params&) = delete;

    // Basic constructor. Specifies only the entry point, and all other
    // parameters have default values. Use specialized entry points when they
    // are available (e.g. `ForBackgroundManager()`).
    static Params FromEntryPoint(EntryPoint entry_point);

    // Builds parameter with the `kOnStartupCreateProfileWithEmail` entry point.
    // Allows specifying the email address used to pre-fill the email field.
    static Params FromStartupWithEmail(const std::string& email);

    // Builds parameter with the `kBackgroundModeManager` entry point. Allows
    // specifying extra parameters.
    static Params ForBackgroundManager(
        const GURL& on_select_profile_target_url);

    EntryPoint entry_point() const { return entry_point_; }

    // Returns the path to the profile to use to display the Web UI.
    const base::FilePath& profile_path() const { return profile_path_; }

    // May be non-empty only for the `kBackgroundModeManager` entry point.
    const GURL& on_select_profile_target_url() const {
      return on_select_profile_target_url_;
    }

    // The email address to pre-fill the email field when creating a new
    // signed in profile.
    const std::string& initial_email() const { return initial_email_; }

    // Builds parameter with the `kFirstRun` entry point.
    //
    // `profile_path` is the profile for which to open the FRE.
    // `first_run_exited_callback` is called when the first run experience is
    // exited, with a `FirstRunExitStatus` indicating how the user responded to
    // it.
    static Params ForFirstRun(const base::FilePath& profile_path,
                              FirstRunExitedCallback first_run_exited_callback);

    // Builds parameter with the `kForGlicManager` entry point.
    //
    // `picked_profile_callback` will be called when a Profile is selected
    // (returning the loaded profile) or when the picker is closed (returning a
    // nullptr profile).
    static Params ForGlicManager(
        base::OnceCallback<void(Profile*)> picked_profile_callback);

    // Builds parameter for the `kOmniboxEverywhere` entry point.
    static Params ForOmniboxEverywhere(
        base::OnceCallback<void(Profile*)> picked_profile_callback);

    // Builds parameters for testing purposes, allowing any entry point and
    // profile path to be specified.
    static Params ForTesting(EntryPoint entry_point,
                             const base::FilePath& profile_path);

    // Calls `first_run_exited_callback_`, forwarding `exit_status`.See
    // `ForFirstRun()` for more details.
    //
    // If this method is not called by the time this `Param` is destroyed, an
    // intent to quit will be assumed and `first_run_exited_callback_` will be
    // called by the destructor with quit-related arguments.
    void NotifyFirstRunExited(FirstRunExitStatus exit_status);

    // Calls `picked_profile_callback_`, forwarding the `profile`. See
    // `ForGlicManager()` for more details.
    // This method will be called if the view/controller are destroyed without a
    // profile being picked - the `profile` will be null in this case.
    void NotifyProfilePicked(Profile* profile);

    // Returns whether the current profile picker window can be reused for
    // different parameters. If this returns false, the picker cannot be reused
    // and must be closed and repoen.
    bool CanReusePickerWindow(const Params& other) const;

   private:
    // Constructor is private, use static functions instead.
    explicit Params(EntryPoint entry_point, const base::FilePath& profile_path);

    EntryPoint entry_point_ = EntryPoint::kOnStartup;
    std::string initial_email_;
    GURL on_select_profile_target_url_;
    base::FilePath profile_path_;
    FirstRunExitedCallback first_run_exited_callback_;
    base::OnceCallback<void(Profile*)> picked_profile_callback_;
  };

  // Values for the ProfilePickerOnStartupAvailability policy. Should not be
  // re-numbered. See components/policy/resources/policy_templates.json for
  // documentation.
  enum class AvailabilityOnStartup {
    kEnabled = 0,
    kDisabled = 1,
    kForced = 2,
    kMax = kForced
  };

  ProfilePicker(const ProfilePicker&) = delete;
  ProfilePicker& operator=(const ProfilePicker&) = delete;

  // Shows the Profile picker for the given `Params` or re-activates an existing
  // one (see `Params::ForAccountSelecAvailableAccount()` for details on
  // re-activation). When reactivated, the displayed page is not updated.
  static void Show(Params&& params);

  // Helper struct to allow passing different profile information for sign in:
  // - An optional color for a new profile.
  // - A file path for an existing profile.
  using ProfileInfo = std::variant<std::optional<SkColor>, base::FilePath>;

  // Starts the sign-in flow. The layout of the window gets updated for the
  // sign-in flow while the profiles are created/loaded.
  // The sign in flow can be triggered for a new or existing profile.
  // For new profiles, the expected color is expected to be given as the
  // `profile_info` param. The creation of the new profile happens and then the
  // sign-in page is rendered using the new profile. The new profile uses a
  // theme generated from the given profile color if provided or the default
  // theme.
  // For an existing profile, the profile path is expected to given as the
  // `profile_info` param. The profile is loaded then the sign-page will be
  // rendered with the profile.
  // `switch_finished_callback` gets informed whether the creation of the new
  // profile succeeded and the sign-in page gets displayed.
  static void SwitchToSignIn(
      ProfileInfo profile_info,
      base::OnceCallback<void(bool)> switch_finished_callback);

  // Starts the reauth for the existing primary account in the given `profile`.
  // The flow will remain within the profile picker. The reauth is expected to
  // be done only on the primary account, if done on another one (the UI may
  // allow it), the reauth will fail and the signed in account will be signed
  // out.
  // On successful reauth, the profile is unlocked and a browser associated with
  // the `profile` will be opened. On unsuccessful reauth, the user will be
  // redirected to the profile picker main page, with a popup error dialog
  // displayed through `on_error_callback`.
  // `switch_finished_callback` will be called once the step was switched (or
  // failed to switch to), the bool parameter indicating the success of the
  // switch.
  static void SwitchToReauth(
      Profile* profile,
      base::OnceCallback<void(bool)> switch_finished_callback,
      base::OnceCallback<void(const ForceSigninUIError&)> on_error_callback);

  // Switch to the flow that comes when the user decides to create a profile
  // without signing in.
  // `profile_color` is the profile's color. It is undefined for the default
  // theme.
  static void SwitchToSignedOutPostIdentityFlow(
      std::optional<SkColor> profile_color);

  struct ProfilePickingArgs {
    // Opens the settings page of the profile once it is first picked.
    bool open_settings = false;
    // Whether we are recording timing metrics about loading the profile and
    // opening the first web content.
    bool should_record_startup_metrics = false;
    // Whether to exit the flow after the profile is picked.
    bool exit_flow_after_profile_picked = true;
  };

  // Picks the profile with `profile_path`.
  // `pick_profile_complete_callback` will be called when a browser is opened
  // with the profile associated with `profile_path`, the boolean parameter
  // returning whether a browser was successfully opened or not.
  static void PickProfile(
      const base::FilePath& profile_path,
      ProfilePickingArgs args,
      base::OnceCallback<void(bool)> pick_profile_complete_callback);

  // Cancel the sign-in flow and returns back to the main picker screen (if
  // the original EntryPoint was to open the picker). Must only be called from
  // within the sign-in flow. This will delete the profile previously created
  // for the signed-in flow.
  static void CancelSignInFlow();

  // Returns the path of the default profile used for rendering the picker.
  static base::FilePath GetPickerProfilePath();

  // Hides the profile picker.
  static void Hide();

  // Returns whether the profile picker is currently open.
  static bool IsOpen();

  // Returns whether the profile picker is currently open and showing the First
  // Run Experience.
  static bool IsFirstRunOpen();

  // Returns whether the Profile picker is showing and active.
  static bool IsActive();

  // Returns the global profile picker view for testing.
  static views::View* GetViewForTesting();

  // Returns the web view (embedded in the picker) for testing.
  static views::WebView* GetWebViewForTesting();

  // Add a callback that will be called the next time the picker is opened.
  static void AddOnProfilePickerOpenedCallbackForTesting(
      base::OnceClosure callback);

  // Overrides the timeout delay for waiting for extended account info.
  static void SetExtendedAccountInfoTimeoutForTesting(base::TimeDelta timeout);

  // Returns a pref value indicating whether the profile picker has ever been
  // shown to the user.
  static bool Shown();

  // Returns whether to show profile picker at launch. This can be called on
  // startup or when Chrome is re-opened, e.g. when clicking on the dock icon on
  // MacOS when there are no windows, or from Windows tray icon.
  static StartupProfileMode GetStartupMode();

  // Opens the command line urls in the next profile that is opened.
  static void SetOpenCommandLineUrlsInNextProfileOpened(bool value);
  static bool GetOpenCommandLineUrlsInNextProfileOpened();
};

#endif  // CHROME_BROWSER_UI_PROFILES_PROFILE_PICKER_H_