// 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.

#ifndef CHROME_BROWSER_DESKTOP_TO_MOBILE_PROMOS_PROMOS_UTILS_H_
#define CHROME_BROWSER_DESKTOP_TO_MOBILE_PROMOS_PROMOS_UTILS_H_

#include <string>

#include "base/feature_list.h"
#include "base/memory/raw_ptr.h"
#include "components/pref_registry/pref_registry_syncable.h"
#include "components/segmentation_platform/public/result.h"

namespace desktop_to_mobile_promos {
enum class PromoType;
}  // namespace desktop_to_mobile_promos

class PrefService;
class Profile;

namespace syncer {
class SyncService;
}  // namespace syncer

namespace promos_utils {

// IOSPromoPrefsConfig is the structure to configure the promo prefs,
// including the feature, the impressions counter and opt out.
struct IOSPromoPrefsConfig {
  IOSPromoPrefsConfig();
  explicit IOSPromoPrefsConfig(desktop_to_mobile_promos::PromoType promo_type);
  IOSPromoPrefsConfig(const IOSPromoPrefsConfig& promo_config);
  ~IOSPromoPrefsConfig();

  raw_ptr<const base::Feature> promo_feature;
  std::string promo_impressions_counter_pref_name;
  std::string promo_opt_out_pref_name;
  std::string promo_last_impression_timestamp_pref_name;
};

// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.

// Enum for different action values possible used in the
// IOS.Desktop.{PromoType}.{Impression}.Action histogram.
// LINT.IfChange
enum class DesktopIOSPromoAction {
  kDismissed = 0,
  kNoThanksClicked = 1,
  kMaxValue = kNoThanksClicked
};
// LINT.ThenChange(//tools/metrics/histograms/metadata/ios/enums.xml)

// Enum for different impression values possible used in the
// IOS.Desktop.{PromoType}.Shown histogram. This must match enums.xml.
// LINT.IfChange
enum class DesktopIOSPromoImpression {
  kFirstImpression = 0,
  kSecondImpression = 1,
  kThirdImpression = 2,
  kMaxValue = kThirdImpression
};
// LINT.ThenChange(//tools/metrics/histograms/metadata/ios/enums.xml)

// Amount of days of data to look back on for the segmentation platform model's
// input data for the iOS Desktop promos.
inline constexpr int kiOSDesktopPromoLookbackWindow = 60;

// GetIOSDesktopPromoFeatureEngagement gets the correct "Feature Engagement
// Tracker" feature for the given promo type.
const base::Feature& GetIOSDesktopPromoFeatureEngagement(
    desktop_to_mobile_promos::PromoType promo_type);

// RegisterProfilePrefs is a helper to register the synced profile prefs.
void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);

// RecordIOSDesktopPromoUserInteractionHistogram records the action taken
// by the user on the iOS promo depending on the promo type and which
// impression being shown.
void RecordIOSDesktopPromoUserInteractionHistogram(
    desktop_to_mobile_promos::PromoType promo_type,
    int impression_count,
    DesktopIOSPromoAction action);

// Checks if the user is eligible for the promo based on the total number of
// impressions, the cooldown period, and the opt-out status across all promo
// types.
bool IsIOSDesktopPromoAllowedByGlobalImpressions(Profile* profile);

// ShouldShowIOSDesktopPromo checks if the user should be shown the iOS desktop
// promo (all criteria are met) depending on the given promo type, and returns
// true if so.
bool ShouldShowIOSDesktopPromo(Profile* profile,
                               const syncer::SyncService* sync_service,
                               desktop_to_mobile_promos::PromoType promo_type);

// Processes the results of the user classification to make sure there were
// no errors and the user is not classified as a switcher from a mobile
// device by the segmentation platform (i.e. return true if the promo should
// be shown).
bool UserNotClassifiedAsMobileDeviceSwitcher(
    const segmentation_platform::ClassificationResult& result);

// IOSDesktopPromoShown sets the updated last impression timestamp,
// increments the impression counter for the given iOS promo type and records
// the necessary histogram.
void IOSDesktopPromoShown(Profile* profile,
                          desktop_to_mobile_promos::PromoType promo_type);

// Updates any necessary prefs for when the promo is shown.
void IOSDesktopNtpPromoShown(PrefService* pref_service);

}  // namespace promos_utils

#endif  // CHROME_BROWSER_DESKTOP_TO_MOBILE_PROMOS_PROMOS_UTILS_H_