// Copyright 2026 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_THEMES_CROSS_DEVICE_THEME_COMPARER_H_
#define COMPONENTS_THEMES_CROSS_DEVICE_THEME_COMPARER_H_

#include "components/sync/protocol/theme_android_specifics.pb.h"
#include "components/sync/protocol/theme_specifics.pb.h"

namespace themes {

namespace internal {

inline bool Equals(const sync_pb::UserColorTheme& lhs,
                   const sync_pb::UserColorTheme& rhs) {
  if (lhs.has_color() != rhs.has_color()) {
    return false;
  }
  if (lhs.has_color() && lhs.color() != rhs.color()) {
    return false;
  }
  if (lhs.has_browser_color_variant() != rhs.has_browser_color_variant()) {
    return false;
  }
  if (lhs.has_browser_color_variant() &&
      lhs.browser_color_variant() != rhs.browser_color_variant()) {
    return false;
  }
  return true;
}

inline bool Equals(const sync_pb::NtpCustomBackground& lhs,
                   const sync_pb::NtpCustomBackground& rhs) {
  if (lhs.has_url() != rhs.has_url()) {
    return false;
  }
  if (lhs.has_url() && lhs.url() != rhs.url()) {
    return false;
  }
  if (lhs.has_attribution_line_1() != rhs.has_attribution_line_1()) {
    return false;
  }
  if (lhs.has_attribution_line_1() &&
      lhs.attribution_line_1() != rhs.attribution_line_1()) {
    return false;
  }
  if (lhs.has_attribution_line_2() != rhs.has_attribution_line_2()) {
    return false;
  }
  if (lhs.has_attribution_line_2() &&
      lhs.attribution_line_2() != rhs.attribution_line_2()) {
    return false;
  }
  if (lhs.has_attribution_action_url() != rhs.has_attribution_action_url()) {
    return false;
  }
  if (lhs.has_attribution_action_url() &&
      lhs.attribution_action_url() != rhs.attribution_action_url()) {
    return false;
  }
  if (lhs.has_collection_id() != rhs.has_collection_id()) {
    return false;
  }
  if (lhs.has_collection_id() && lhs.collection_id() != rhs.collection_id()) {
    return false;
  }
  if (lhs.has_resume_token() != rhs.has_resume_token()) {
    return false;
  }
  if (lhs.has_resume_token() && lhs.resume_token() != rhs.resume_token()) {
    return false;
  }
  if (lhs.has_refresh_timestamp_unix_epoch_seconds() !=
      rhs.has_refresh_timestamp_unix_epoch_seconds()) {
    return false;
  }
  if (lhs.has_refresh_timestamp_unix_epoch_seconds() &&
      lhs.refresh_timestamp_unix_epoch_seconds() !=
          rhs.refresh_timestamp_unix_epoch_seconds()) {
    return false;
  }
  if (lhs.has_main_color() != rhs.has_main_color()) {
    return false;
  }
  if (lhs.has_main_color() && lhs.main_color() != rhs.main_color()) {
    return false;
  }
  return true;
}

}  // namespace internal

// Helper to compare theme specifics.
// Each platform must specialize this for its own specifics type to avoid
// using SerializeAsString() which is unstable.
template <typename T>
struct ThemeComparer;

template <>
struct ThemeComparer<sync_pb::ThemeSpecifics> {
  static bool Equals(const sync_pb::ThemeSpecifics& lhs,
                     const sync_pb::ThemeSpecifics& rhs) {
    if (lhs.has_use_custom_theme() != rhs.has_use_custom_theme()) {
      return false;
    }
    if (lhs.has_use_custom_theme() &&
        lhs.use_custom_theme() != rhs.use_custom_theme()) {
      return false;
    }

    if (lhs.has_use_system_theme_by_default() !=
        rhs.has_use_system_theme_by_default()) {
      return false;
    }
    if (lhs.has_use_system_theme_by_default() &&
        lhs.use_system_theme_by_default() !=
            rhs.use_system_theme_by_default()) {
      return false;
    }

    if (lhs.has_custom_theme_name() != rhs.has_custom_theme_name()) {
      return false;
    }
    if (lhs.has_custom_theme_name() &&
        lhs.custom_theme_name() != rhs.custom_theme_name()) {
      return false;
    }

    if (lhs.has_custom_theme_id() != rhs.has_custom_theme_id()) {
      return false;
    }
    if (lhs.has_custom_theme_id() &&
        lhs.custom_theme_id() != rhs.custom_theme_id()) {
      return false;
    }

    if (lhs.has_custom_theme_update_url() !=
        rhs.has_custom_theme_update_url()) {
      return false;
    }
    if (lhs.has_custom_theme_update_url() &&
        lhs.custom_theme_update_url() != rhs.custom_theme_update_url()) {
      return false;
    }

    if (lhs.has_browser_color_scheme() != rhs.has_browser_color_scheme()) {
      return false;
    }
    if (lhs.has_browser_color_scheme() &&
        lhs.browser_color_scheme() != rhs.browser_color_scheme()) {
      return false;
    }

    if (lhs.color_case() != rhs.color_case()) {
      return false;
    }
    switch (lhs.color_case()) {
      case sync_pb::ThemeSpecifics::kAutogeneratedColorTheme:
        if (lhs.autogenerated_color_theme().color() !=
            rhs.autogenerated_color_theme().color()) {
          return false;
        }
        break;
      case sync_pb::ThemeSpecifics::kUserColorTheme:
        if (!internal::Equals(lhs.user_color_theme(), rhs.user_color_theme())) {
          return false;
        }
        break;
      case sync_pb::ThemeSpecifics::kGrayscaleThemeEnabled:
        break;
      case sync_pb::ThemeSpecifics::COLOR_NOT_SET:
        break;
    }

    if (lhs.has_ntp_background() != rhs.has_ntp_background()) {
      return false;
    }
    if (lhs.has_ntp_background() &&
        !internal::Equals(lhs.ntp_background(), rhs.ntp_background())) {
      return false;
    }

    return true;
  }
};

template <>
struct ThemeComparer<sync_pb::ThemeAndroidSpecifics> {
  static bool Equals(const sync_pb::ThemeAndroidSpecifics& lhs,
                     const sync_pb::ThemeAndroidSpecifics& rhs) {
    if (lhs.has_use_custom_theme() != rhs.has_use_custom_theme()) {
      return false;
    }
    if (lhs.has_use_custom_theme() &&
        lhs.use_custom_theme() != rhs.use_custom_theme()) {
      return false;
    }

    if (lhs.has_user_color_theme() != rhs.has_user_color_theme()) {
      return false;
    }
    if (lhs.has_user_color_theme() &&
        !internal::Equals(lhs.user_color_theme(), rhs.user_color_theme())) {
      return false;
    }

    if (lhs.has_ntp_background() != rhs.has_ntp_background()) {
      return false;
    }
    if (lhs.has_ntp_background() &&
        !internal::Equals(lhs.ntp_background(), rhs.ntp_background())) {
      return false;
    }

    return true;
  }
};

}  // namespace themes

#endif  // COMPONENTS_THEMES_CROSS_DEVICE_THEME_COMPARER_H_