// Copyright (c) 2012 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.

#ifndef CHROME_BROWSER_POLICY_CLOUD_CLOUD_POLICY_MANAGER_H_
#define CHROME_BROWSER_POLICY_CLOUD_CLOUD_POLICY_MANAGER_H_

#include <string>

#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/prefs/pref_member.h"
#include "chrome/browser/policy/cloud/cloud_policy_constants.h"
#include "chrome/browser/policy/cloud/cloud_policy_core.h"
#include "chrome/browser/policy/cloud/cloud_policy_store.h"
#include "chrome/browser/policy/cloud/component_cloud_policy_service.h"
#include "components/policy/core/common/configuration_policy_provider.h"

namespace base {
class FilePath;
class SequencedTaskRunner;
}

namespace net {
class URLRequestContextGetter;
}

namespace policy {

// CloudPolicyManager is the main switching central between cloud policy and the
// upper layers of the policy stack. It wires up a CloudPolicyCore to the
// ConfigurationPolicyProvider interface.
//
// This class contains the base functionality, there are subclasses that add
// functionality specific to user-level and device-level cloud policy, such as
// blocking on initial user policy fetch or device enrollment.
class CloudPolicyManager : public ConfigurationPolicyProvider,
                           public CloudPolicyStore::Observer,
                           public ComponentCloudPolicyService::Delegate {
 public:
  // |task_runner| is the runner for policy refresh tasks.
  // |file_task_runner| is used for file operations. Currently this must be the
  // FILE BrowserThread.
  // |io_task_runner| is used for network IO. Currently this must be the IO
  // BrowserThread.
  CloudPolicyManager(
      const PolicyNamespaceKey& policy_ns_key,
      CloudPolicyStore* cloud_policy_store,
      const scoped_refptr<base::SequencedTaskRunner>& task_runner,
      const scoped_refptr<base::SequencedTaskRunner>& file_task_runner,
      const scoped_refptr<base::SequencedTaskRunner>& io_task_runner);
  virtual ~CloudPolicyManager();

  CloudPolicyCore* core() { return &core_; }
  const CloudPolicyCore* core() const { return &core_; }

  // ConfigurationPolicyProvider:
  virtual void Shutdown() OVERRIDE;
  virtual bool IsInitializationComplete(PolicyDomain domain) const OVERRIDE;
  virtual void RefreshPolicies() OVERRIDE;

  // CloudPolicyStore::Observer:
  virtual void OnStoreLoaded(CloudPolicyStore* cloud_policy_store) OVERRIDE;
  virtual void OnStoreError(CloudPolicyStore* cloud_policy_store) OVERRIDE;

  // ComponentCloudPolicyService::Delegate:
  virtual void OnComponentCloudPolicyUpdated() OVERRIDE;

 protected:
  // Check whether fully initialized and if so, publish policy by calling
  // ConfigurationPolicyStore::UpdatePolicy().
  void CheckAndPublishPolicy();

  void CreateComponentCloudPolicyService(
      const base::FilePath& policy_cache_path,
      const scoped_refptr<net::URLRequestContextGetter>& request_context);

  void ClearAndDestroyComponentCloudPolicyService();

  // Convenience accessors to core() components.
  CloudPolicyClient* client() { return core_.client(); }
  const CloudPolicyClient* client() const { return core_.client(); }
  CloudPolicyStore* store() { return core_.store(); }
  const CloudPolicyStore* store() const { return core_.store(); }
  CloudPolicyService* service() { return core_.service(); }
  const CloudPolicyService* service() const { return core_.service(); }
  ComponentCloudPolicyService* component_policy_service() const {
    return component_policy_service_.get();
  }

 private:
  // Completion handler for policy refresh operations.
  void OnRefreshComplete(bool success);

  CloudPolicyCore core_;
  scoped_ptr<ComponentCloudPolicyService> component_policy_service_;

  // Whether there's a policy refresh operation pending, in which case all
  // policy update notifications are deferred until after it completes.
  bool waiting_for_policy_refresh_;

  scoped_refptr<base::SequencedTaskRunner> file_task_runner_;
  scoped_refptr<base::SequencedTaskRunner> io_task_runner_;

  DISALLOW_COPY_AND_ASSIGN(CloudPolicyManager);
};

}  // namespace policy

#endif  // CHROME_BROWSER_POLICY_CLOUD_CLOUD_POLICY_MANAGER_H_