// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/content_settings/core/common/content_settings_utils.h"

#include <memory>
#include <optional>
#include <variant>

#include "base/feature_list.h"
#include "base/values.h"
#include "components/content_settings/core/common/content_settings.h"
#include "components/content_settings/core/common/content_settings_types.h"
#include "components/content_settings/core/common/features.h"
#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
#include "third_party/abseil-cpp/absl/functional/overload.h"
#include "url/gurl.h"
#include "url/origin.h"

namespace content_settings {

// Converts a |Value| to a |ContentSetting|. Returns a result if |value| encodes
// a valid content setting, nullopt otherwise. Note that
// |CONTENT_SETTING_DEFAULT| is encoded as a NULL value, so it is not allowed as
// an integer value.
std::optional<ContentSetting> ParseContentSettingValue(
    const base::Value& value) {
  if (value.is_none()) {
    return CONTENT_SETTING_DEFAULT;
  }
  if (!value.is_int()) {
    return std::nullopt;
  }
  ContentSetting setting = IntToContentSetting(value.GetInt());
  return setting == CONTENT_SETTING_DEFAULT ? std::nullopt
                                            : std::make_optional(setting);
}

ContentSetting ValueToContentSetting(const base::Value& value) {
  auto setting = ParseContentSettingValue(value);
  DCHECK(setting.has_value()) << value.DebugString();
  return setting.value_or(CONTENT_SETTING_DEFAULT);
}

base::Value ContentSettingToValue(ContentSetting setting) {
  if (setting <= CONTENT_SETTING_DEFAULT ||
      setting >= CONTENT_SETTING_NUM_SETTINGS) {
    return base::Value();
  }
  return base::Value(setting);
}


std::unique_ptr<base::Value> ToNullableUniquePtrValue(base::Value value) {
  if (value.is_none()) {
    return nullptr;
  }
  return base::Value::ToUniquePtrValue(std::move(value));
}

base::Value FromNullableUniquePtrValue(std::unique_ptr<base::Value> value) {
  if (!value) {
    return base::Value();
  }
  return base::Value::FromUniquePtrValue(std::move(value));
}

bool PatternAppliesToSingleOrigin(
    const ContentSettingsPattern& primary_pattern,
    const ContentSettingsPattern& secondary_pattern) {
  // Default settings and other patterns apply to multiple origins.
  if (!primary_pattern.MatchesSingleOrigin()) {
    return false;
  }
  // Embedded content settings only match when |url| is embedded in another
  // origin, so ignore non-wildcard secondary patterns.
  if (secondary_pattern != ContentSettingsPattern::Wildcard()) {
    return false;
  }
  return true;
}

ContentSetting ToContentSetting(PermissionOption option) {
  switch (option) {
    case PermissionOption::kAllowed:
      return CONTENT_SETTING_ALLOW;
    case PermissionOption::kDenied:
      return CONTENT_SETTING_BLOCK;
    case PermissionOption::kAsk:
      return CONTENT_SETTING_ASK;
  }
}

PermissionOption ToPermissionOption(ContentSetting setting) {
  switch (setting) {
    case CONTENT_SETTING_ALLOW:
      return PermissionOption::kAllowed;
    case CONTENT_SETTING_BLOCK:
      return PermissionOption::kDenied;
    case CONTENT_SETTING_ASK:
      return PermissionOption::kAsk;
    default:
      NOTREACHED() << setting;
  }
}

ContentSettingsType GeolocationContentSettingsType() {
  return base::FeatureList::IsEnabled(
             features::kApproximateGeolocationPermission)
             ? ContentSettingsType::GEOLOCATION_WITH_OPTIONS
             : ContentSettingsType::GEOLOCATION;
}

}  // namespace content_settings