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

#include "ios/chrome/browser/policy/browser_signin_policy_handler.h"

#include <memory>

#include "base/strings/string_number_conversions.h"
#include "base/syslog_logging.h"
#include "base/values.h"
#include "components/policy/core/browser/policy_error_map.h"
#include "components/policy/core/common/policy_map.h"
#include "components/policy/policy_constants.h"
#include "components/prefs/pref_value_map.h"
#include "components/signin/public/base/signin_pref_names.h"
#include "components/strings/grit/components_strings.h"
#include "ios/chrome/browser/policy/policy_util.h"

namespace policy {
BrowserSigninPolicyHandler::BrowserSigninPolicyHandler(Schema chrome_schema)
    : SchemaValidatingPolicyHandler(
          key::kBrowserSignin,
          chrome_schema.GetKnownProperty(key::kBrowserSignin),
          SCHEMA_ALLOW_UNKNOWN) {}

BrowserSigninPolicyHandler::~BrowserSigninPolicyHandler() {}

bool BrowserSigninPolicyHandler::CheckPolicySettings(
    const policy::PolicyMap& policies,
    policy::PolicyErrorMap* errors) {
  const base::Value* value = policies.GetValue(policy_name());
  if (!value)
    return true;

  if (!SchemaValidatingPolicyHandler::CheckPolicySettings(policies, errors))
    return false;

  int int_value = value->GetAsInteger(&int_value);
  if (int_value == static_cast<int>(BrowserSigninMode::kForced)) {
    // Don't return false because in this case the policy falls back to
    // BrowserSigninMode::kEnabled
    errors->AddError(policy_name(), IDS_POLICY_LEVEL_ERROR);
  }

  return true;
}

void BrowserSigninPolicyHandler::ApplyPolicySettings(const PolicyMap& policies,
                                                     PrefValueMap* prefs) {
  const base::Value* value = policies.GetValue(policy_name());
  int int_value;
  if (value && value->GetAsInteger(&int_value)) {
    if (static_cast<int>(BrowserSigninMode::kDisabled) > int_value ||
        static_cast<int>(BrowserSigninMode::kForced) < int_value) {
      SYSLOG(ERROR) << "Unexpected value for BrowserSigninMode: " << int_value;
      NOTREACHED();
      return;
    }
    switch (static_cast<BrowserSigninMode>(int_value)) {
      case BrowserSigninMode::kForced:
        // Forced sign-in isn't supported at the moment on iOS. Fall back to
        // sign-in enabled.
        FALLTHROUGH;
      case BrowserSigninMode::kEnabled:
        prefs->SetValue(prefs::kSigninAllowed, base::Value(true));
        break;
      case BrowserSigninMode::kDisabled:
        prefs->SetValue(prefs::kSigninAllowed, base::Value(false));
        break;
    }
  }
}

}  // namespace policy