// Copyright 2013 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 "chrome/browser/sessions/restore_on_startup_policy_handler.h"

#include "base/prefs/pref_value_map.h"
#include "base/strings/string_number_conversions.h"
#include "base/values.h"
#include "chrome/browser/prefs/session_startup_pref.h"
#include "chrome/common/pref_names.h"
#include "components/policy/core/browser/policy_error_map.h"
#include "components/policy/core/common/policy_map.h"
#include "grit/component_strings.h"
#include "policy/policy_constants.h"

namespace policy {

RestoreOnStartupPolicyHandler::RestoreOnStartupPolicyHandler()
    : TypeCheckingPolicyHandler(key::kRestoreOnStartup,
                                base::Value::TYPE_INTEGER) {}

RestoreOnStartupPolicyHandler::~RestoreOnStartupPolicyHandler() {
}

void RestoreOnStartupPolicyHandler::ApplyPolicySettings(
    const PolicyMap& policies,
    PrefValueMap* prefs) {
  const base::Value* restore_on_startup_value =
      policies.GetValue(policy_name());
  if (restore_on_startup_value) {
    int restore_on_startup;
    if (!restore_on_startup_value->GetAsInteger(&restore_on_startup))
      return;

    if (restore_on_startup == SessionStartupPref::kPrefValueHomePage)
      ApplyPolicySettingsFromHomePage(policies, prefs);
    else
      prefs->SetInteger(prefs::kRestoreOnStartup, restore_on_startup);
  }
}

void RestoreOnStartupPolicyHandler::ApplyPolicySettingsFromHomePage(
    const PolicyMap& policies,
    PrefValueMap* prefs) {
  const base::Value* homepage_is_new_tab_page_value =
      policies.GetValue(key::kHomepageIsNewTabPage);
  if (!homepage_is_new_tab_page_value) {
    // The policy is enforcing 'open the homepage on startup' but not
    // enforcing what the homepage should be. Don't set any prefs.
    return;
  }

  bool homepage_is_new_tab_page;
  if (!homepage_is_new_tab_page_value->GetAsBoolean(&homepage_is_new_tab_page))
    return;

  if (homepage_is_new_tab_page) {
    prefs->SetInteger(prefs::kRestoreOnStartup,
                      SessionStartupPref::kPrefValueNewTab);
  } else {
    const base::Value* homepage_value =
        policies.GetValue(key::kHomepageLocation);
    if (!homepage_value || !homepage_value->IsType(base::Value::TYPE_STRING)) {
      // The policy is enforcing 'open the homepage on startup' but not
      // enforcing what the homepage should be. Don't set any prefs.
      return;
    }
    base::ListValue* url_list = new base::ListValue();
    url_list->Append(homepage_value->DeepCopy());
    prefs->SetInteger(prefs::kRestoreOnStartup,
                      SessionStartupPref::kPrefValueURLs);
    prefs->SetValue(prefs::kURLsToRestoreOnStartup, url_list);
  }
}

bool RestoreOnStartupPolicyHandler::CheckPolicySettings(
    const PolicyMap& policies,
    PolicyErrorMap* errors) {
  if (!TypeCheckingPolicyHandler::CheckPolicySettings(policies, errors))
    return false;

  const base::Value* restore_policy = policies.GetValue(key::kRestoreOnStartup);

  if (restore_policy) {
    int restore_value;
    CHECK(restore_policy->GetAsInteger(&restore_value));  // Passed type check.
    switch (restore_value) {
      case SessionStartupPref::kPrefValueHomePage:
        errors->AddError(policy_name(), IDS_POLICY_VALUE_DEPRECATED);
        break;
      case SessionStartupPref::kPrefValueLast: {
        // If the "restore last session" policy is set, session cookies are
        // treated as permanent cookies and site data needed to restore the
        // session is not cleared so we have to warn the user in that case.
        const base::Value* cookies_policy =
            policies.GetValue(key::kCookiesSessionOnlyForUrls);
        const base::ListValue* cookies_value;
        if (cookies_policy && cookies_policy->GetAsList(&cookies_value) &&
            !cookies_value->empty()) {
          errors->AddError(key::kCookiesSessionOnlyForUrls,
                           IDS_POLICY_OVERRIDDEN,
                           key::kRestoreOnStartup);
        }

        const base::Value* exit_policy =
            policies.GetValue(key::kClearSiteDataOnExit);
        bool exit_value;
        if (exit_policy && exit_policy->GetAsBoolean(&exit_value) &&
            exit_value) {
          errors->AddError(key::kClearSiteDataOnExit,
                           IDS_POLICY_OVERRIDDEN,
                           key::kRestoreOnStartup);
        }
        break;
      }
      case SessionStartupPref::kPrefValueURLs:
      case SessionStartupPref::kPrefValueNewTab:
        // No error
        break;
      default:
        errors->AddError(policy_name(),
                         IDS_POLICY_OUT_OF_RANGE_ERROR,
                         base::IntToString(restore_value));
    }
  }
  return true;
}

}  // namespace policy