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// Copyright (c) 2010 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 <string>
#include <vector>

#include "base/file_path.h"
#include "base/lock.h"
#include "base/scoped_ptr.h"
#include "chrome/browser/dom_ui/dom_ui.h"
#include "chrome/browser/dom_ui/html_dialog_ui.h"
#include "chrome/common/notification_observer.h"
#include "chrome/common/notification_registrar.h"

class GURL;
class StringValue;
class CloudPrintHtmlDialogDelegateTest;

namespace internal_cloud_print_helpers {

// Centralize URL management for the cloud print service.
class CloudPrintService {
  explicit CloudPrintService(Profile* profile) : profile_(profile) {}

  GURL GetCloudPrintServiceURL();
  GURL GetCloudPrintServiceDialogURL();

  void RegisterPreferences();

  Profile* profile_;

// Small class to virtualize a few functions to aid with unit testing.
class CloudPrintDataSenderHelper {
  explicit CloudPrintDataSenderHelper(DOMUI* dom_ui) : dom_ui_(dom_ui) {}
  virtual ~CloudPrintDataSenderHelper() {}

  // Virtualize the overrides of these three functions from DOMUI to
  // facilitate unit testing.
  virtual void CallJavascriptFunction(const std::wstring& function_name);
  virtual void CallJavascriptFunction(const std::wstring& function_name,
                                      const Value& arg);
  virtual void CallJavascriptFunction(const std::wstring& function_name,
                                      const Value& arg1,
                                      const Value& arg2);

  DOMUI* dom_ui_;


// Small helper class to get the print data loaded in from the PDF
// file (on the FILE thread) and send it to the print dialog contents
// (on the IO thread), allowing for cancellation.
class CloudPrintDataSender
    : public base::RefCountedThreadSafe<CloudPrintDataSender> {
  // The owner of this object is also expected to own and control the
  // lifetime of the helper.
  CloudPrintDataSender(CloudPrintDataSenderHelper* helper,
                       const string16& print_job_title)
      : helper_(helper), print_job_title_(print_job_title) {}

  // Calls to read in the PDF file (on the FILE thread) then send that
  // information to the dialog renderer (on the IO thread).  We know
  // that the dom_ui pointer lifetime will outlast us, so we should be
  // good.
  void ReadPrintDataFile(const FilePath& path_to_pdf);
  void SendPrintDataFile();

  // Cancels any ramining part of the task by clearing out the dom_ui
  // helper_ ptr.
  void CancelPrintDataFile();

  friend class base::RefCountedThreadSafe<CloudPrintDataSender>;
  ~CloudPrintDataSender() {}

  Lock lock_;
  CloudPrintDataSenderHelper* volatile helper_;
  scoped_ptr<StringValue> print_data_;
  string16 print_job_title_;


class CloudPrintHtmlDialogDelegate;

// The CloudPrintFlowHandler connects the state machine (the UI delegate)
// to the dialog backing HTML and JS by providing DOMMessageHandler
// functions for the JS to use.  This include refreshing the page
// setup parameters (which will cause a re-generation of the PDF in
// the renderer process - do we want a progress throbber shown?
// Probably..), and packing up the PDF and job parameters and sending
// them to the cloud.
class CloudPrintFlowHandler : public DOMMessageHandler,
                              public NotificationObserver {
  explicit CloudPrintFlowHandler(const FilePath& path_to_pdf,
                                 const string16& print_job_title)
      : path_to_pdf_(path_to_pdf),
        print_job_title_(print_job_title) {}
  virtual ~CloudPrintFlowHandler() {
    // This will also cancel any task in flight.

  // DOMMessageHandler implementation.
  virtual void RegisterMessages();

  // NotificationObserver implementation.
  virtual void Observe(NotificationType type,
                       const NotificationSource& source,
                       const NotificationDetails& details);

  // Callbacks from the page.
  void HandleShowDebugger(const Value* value);
  void HandleSendPrintData(const Value* value);
  void HandleSetPageParameters(const Value* value);

  // Call to get the debugger loaded on our hosted dialog page
  // specifically.  Since we're not in an official browser tab, only
  // way to get the debugger going.
  void ShowDebugger();

  virtual void SetDialogDelegate(CloudPrintHtmlDialogDelegate *delegate);
  void CancelAnyRunningTask();

  // For unit testing.
  virtual scoped_refptr<CloudPrintDataSender> CreateCloudPrintDataSender();

  CloudPrintHtmlDialogDelegate* dialog_delegate_;
  NotificationRegistrar registrar_;
  FilePath path_to_pdf_;
  string16 print_job_title_;
  scoped_refptr<CloudPrintDataSender> print_data_sender_;
  scoped_ptr<CloudPrintDataSenderHelper> print_data_helper_;


// State machine used to run the printing dialog.  This class is used
// to open and run the html dialog and deletes itself when the dialog
// is closed.
class CloudPrintHtmlDialogDelegate : public HtmlDialogUIDelegate {
  CloudPrintHtmlDialogDelegate(const FilePath& path_to_pdf,
                               int width, int height,
                               const std::string& json_arguments,
                               const string16& print_job_title);
  virtual ~CloudPrintHtmlDialogDelegate();

  // HTMLDialogUIDelegate implementation:
  virtual bool IsDialogModal() const;
  virtual std::wstring GetDialogTitle() const;
  virtual GURL GetDialogContentURL() const;
  virtual void GetDOMMessageHandlers(
      std::vector<DOMMessageHandler*>* handlers) const;
  virtual void GetDialogSize(gfx::Size* size) const;
  virtual std::string GetDialogArgs() const;
  virtual void OnDialogClosed(const std::string& json_retval);
  virtual void OnCloseContents(TabContents* source, bool* out_close_dialog);

  friend class ::CloudPrintHtmlDialogDelegateTest;

  CloudPrintHtmlDialogDelegate(CloudPrintFlowHandler* flow_handler,
                               int width, int height,
                               const std::string& json_arguments);
  void Init(int width, int height, const std::string& json_arguments);

  CloudPrintFlowHandler* flow_handler_;
  mutable bool owns_flow_handler_;

  // The parameters needed to display a modal HTML dialog.
  HtmlDialogUI::HtmlDialogParams params_;


}  // namespace internal_cloud_print_helpers


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