// 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_PRINTING_PRINT_JOB_MANAGER_H_
#define CHROME_BROWSER_PRINTING_PRINT_JOB_MANAGER_H_
#pragma once

#include <vector>

#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "chrome/browser/prefs/pref_member.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"

class PrefService;

namespace printing {

class JobEventDetails;
class PrintJob;
class PrinterQuery;

class PrintJobManager : public content::NotificationObserver {
 public:
  PrintJobManager();
  virtual ~PrintJobManager();

  // Registers for changes to the printing enabled preference in |prefs|.
  // This method should be called on the UI thread.
  void InitOnUIThread(PrefService* prefs);

  // On browser quit, we should wait to have the print job finished.
  void OnQuit();

  // Stops all printing jobs. If wait_for_finish is true, tries to give jobs
  // a chance to complete before stopping them.
  void StopJobs(bool wait_for_finish);

  // Queues a semi-initialized worker thread. Can be called from any thread.
  // Current use case is queuing from the I/O thread.
  // TODO(maruel):  Have them vanish after a timeout (~5 minutes?)
  void QueuePrinterQuery(PrinterQuery* job);

  // Pops a queued PrintJobWorkerOwner object that was previously queued. Can be
  // called from any thread. Current use case is poping from the browser thread.
  void PopPrinterQuery(int document_cookie, scoped_refptr<PrinterQuery>* job);

  static void RegisterPrefs(PrefService* prefs);

  // content::NotificationObserver
  virtual void Observe(int type,
                       const content::NotificationSource& source,
                       const content::NotificationDetails& details) OVERRIDE;

  // Only accessed on the IO thread. UI thread can query
  // prefs::kPrintingEnabled via g_browser_process->local_state() directly.
  bool printing_enabled() const;

 private:
  typedef std::vector<scoped_refptr<PrintJob> > PrintJobs;
  typedef std::vector<scoped_refptr<PrinterQuery> > PrinterQueries;

  // Processes a NOTIFY_PRINT_JOB_EVENT notification.
  void OnPrintJobEvent(PrintJob* print_job,
                       const JobEventDetails& event_details);

  content::NotificationRegistrar registrar_;

  // Printing is enabled/disabled. For printing with the native print dialog,
  // this variable is checked at only one place, by
  // PrintingMessageFilter::OnGetDefaultPrintSettings. If its value is true
  // at that point, then the initiated print flow will complete itself,
  // even if the value of this variable changes afterwards.
  // In the print preview workflow, this variable is checked in
  // PrintingMessageFilter::OnUpdatePrintSettings, which gets called multiple
  // times in the print preview workflow.
  BooleanPrefMember printing_enabled_;

  // Used to serialize access to queued_workers_.
  base::Lock lock_;

  PrinterQueries queued_queries_;

  // Current print jobs that are active.
  PrintJobs current_jobs_;

  DISALLOW_COPY_AND_ASSIGN(PrintJobManager);
};

}  // namespace printing

#endif  // CHROME_BROWSER_PRINTING_PRINT_JOB_MANAGER_H_