// 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/policy/core/browser/policy_conversions.h"

#include <string>
#include <utility>

#include "base/check.h"
#include "base/values.h"
#include "build/build_config.h"
#include "components/policy/core/browser/policy_conversions_client.h"
#include "extensions/buildflags/buildflags.h"
#include "ui/base/l10n/l10n_util.h"

namespace policy {

namespace {

#if !BUILDFLAG(IS_CHROMEOS)
constexpr char kPrecedenceOrderKey[] = "precedenceOrder";
#endif  // !BUILDFLAG(IS_CHROMEOS)

#if BUILDFLAG(IS_CHROMEOS)
constexpr char kDeviceLocalAccountPoliciesId[] = "deviceLocalAccountPolicies";
#endif  // BUILDFLAG(IS_CHROMEOS)

}  // namespace

PolicyConversions::Delegate::Delegate(PolicyConversionsClient* client)
    : client_(client) {}
PolicyConversions::Delegate::~Delegate() = default;

PolicyConversions::PolicyConversions(
    std::unique_ptr<PolicyConversionsClient> client)
    : client_(std::move(client)),
      delegate_(std::make_unique<DefaultPolicyConversions>(client_.get())) {
  DCHECK(client_.get());
}

PolicyConversions::~PolicyConversions() = default;

PolicyConversions& PolicyConversions::EnableConvertTypes(bool enabled) {
  client_->EnableConvertTypes(enabled);
  return *this;
}

PolicyConversions& PolicyConversions::EnableConvertValues(bool enabled) {
  client_->EnableConvertValues(enabled);
  return *this;
}

PolicyConversions& PolicyConversions::EnableDeviceLocalAccountPolicies(
    bool enabled) {
  client_->EnableDeviceLocalAccountPolicies(enabled);
  return *this;
}

PolicyConversions& PolicyConversions::EnableDeviceInfo(bool enabled) {
  client_->EnableDeviceInfo(enabled);
  return *this;
}

PolicyConversions& PolicyConversions::EnablePrettyPrint(bool enabled) {
  client_->EnablePrettyPrint(enabled);
  return *this;
}

PolicyConversions& PolicyConversions::EnableUserPolicies(bool enabled) {
  client_->EnableUserPolicies(enabled);
  return *this;
}

PolicyConversions& PolicyConversions::SetDropDefaultValues(bool enabled) {
  client_->SetDropDefaultValues(enabled);
  return *this;
}

PolicyConversions& PolicyConversions::EnableShowMachineValues(bool enabled) {
  client_->EnableShowMachineValues(enabled);
  return *this;
}

PolicyConversions& PolicyConversions::UseChromePolicyConversions() {
  delegate_ = std::make_unique<ChromePolicyConversions>(client_.get());
  return *this;
}

std::string PolicyConversions::ToJSON() {
  return client_->ConvertValueToJSON(base::Value(ToValueDict()));
}

base::DictValue PolicyConversions::ToValueDict() {
  return delegate_->ToValueDict();
}

/**
 * DefaultPolicyConversions
 */

DefaultPolicyConversions::DefaultPolicyConversions(
    PolicyConversionsClient* client)
    : PolicyConversions::Delegate(client) {}
DefaultPolicyConversions::~DefaultPolicyConversions() = default;

base::DictValue DefaultPolicyConversions::ToValueDict() {
  base::DictValue all_policies;

  if (client()->HasUserPolicies()) {
    all_policies.Set("chromePolicies", client()->GetChromePolicies());
  }

#if BUILDFLAG(ENABLE_EXTENSIONS)
  all_policies.Merge(GetExtensionPolicies());
#endif  // BUILDFLAG(ENABLE_EXTENSIONS)

#if BUILDFLAG(IS_CHROMEOS)
  all_policies.Set(kDeviceLocalAccountPoliciesId,
                   GetDeviceLocalAccountPolicies());
  base::DictValue identity_fields = client()->GetIdentityFields();
  if (!identity_fields.empty())
    all_policies.Merge(std::move(identity_fields));
#endif  // BUILDFLAG(IS_CHROMEOS)
  return all_policies;
}

#if BUILDFLAG(IS_CHROMEOS)
base::DictValue DefaultPolicyConversions::GetDeviceLocalAccountPolicies() {
  base::ListValue policies = client()->GetDeviceLocalAccountPolicies();
  base::DictValue device_values;
  for (auto&& policy : policies) {
    const std::string* id = policy.GetDict().FindString(kIdKey);
    base::Value* policies_value = policy.GetDict().Find(kPoliciesKey);
    DCHECK(id);
    DCHECK(policies_value);
    device_values.Set(*id, std::move(*policies_value));
  }
  return device_values;
}
#endif

#if BUILDFLAG(ENABLE_EXTENSIONS)
base::DictValue DefaultPolicyConversions::GetExtensionPolicies() {
  base::DictValue extension_policies;
  if (client()->HasUserPolicies()) {
    extension_policies.Set("extensionPolicies",
                           GetExtensionPolicies(POLICY_DOMAIN_EXTENSIONS));
  }
#if BUILDFLAG(IS_CHROMEOS)
  extension_policies.Set("loginScreenExtensionPolicies",
                         GetExtensionPolicies(POLICY_DOMAIN_SIGNIN_EXTENSIONS));
#endif  // BUILDFLAG(IS_CHROMEOS)
  return extension_policies;
}

base::DictValue DefaultPolicyConversions::GetExtensionPolicies(
    PolicyDomain policy_domain) {
  base::ListValue policies = client()->GetExtensionPolicies(policy_domain);
  base::DictValue extension_values;
  for (auto&& policy : policies) {
    const std::string* id = policy.GetDict().FindString(kIdKey);
    base::Value* policies_value = policy.GetDict().Find(kPoliciesKey);
    DCHECK(id);
    DCHECK(policies_value);
    extension_values.Set(*id, std::move(*policies_value));
  }
  return extension_values;
}

#endif  // BUILDFLAG(ENABLE_EXTENSIONS)

/**
 * ChromePolicyConversions
 */
ChromePolicyConversions::ChromePolicyConversions(
    PolicyConversionsClient* client)
    : PolicyConversions::Delegate(client) {}
ChromePolicyConversions::~ChromePolicyConversions() = default;

base::DictValue ChromePolicyConversions::ToValueDict() {
  CHECK(!client()->GetDeviceLocalAccountPoliciesEnabled())
      << "Chrome policies doesn't include device local account policies.";
  CHECK(!client()->GetDeviceInfoEnabled())
      << "Chrome policies doesn't include device info.";
  base::DictValue all_policies;

  if (client()->HasUserPolicies()) {
    all_policies.Set(kChromePoliciesId, GetChromePolicies());

#if !BUILDFLAG(IS_CHROMEOS)
    // Precedence policies do not apply to Chrome OS, so the Policy Precedence
    // table is not shown in chrome://policy.
    all_policies.Set(kPrecedencePoliciesId, GetPrecedencePolicies());
#endif  // !BUILDFLAG(IS_CHROMEOS)
  }

  return all_policies;
}

base::DictValue ChromePolicyConversions::GetChromePolicies() {
  base::DictValue chrome_policies_data;
  chrome_policies_data.Set(kNameKey, kChromePoliciesName);
  base::DictValue chrome_policies = client()->GetChromePolicies();
  chrome_policies_data.Set(kPoliciesKey, std::move(chrome_policies));
  return chrome_policies_data;
}

#if !BUILDFLAG(IS_CHROMEOS)
base::DictValue ChromePolicyConversions::GetPrecedencePolicies() {
  base::DictValue precedence_policies_data;
  precedence_policies_data.Set(kNameKey, kPrecedencePoliciesName);
  precedence_policies_data.Set(kPoliciesKey, client()->GetPrecedencePolicies());
  precedence_policies_data.Set(kPrecedenceOrderKey,
                               client()->GetPrecedenceOrder());
  return precedence_policies_data;
}
#endif  // !BUILDFLAG(IS_CHROMEOS)

}  // namespace policy