// Filename: ppInstance.h
// Created by:  drose (19Jun09)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) Carnegie Mellon University.  All rights reserved.
//
// All use of this software is subject to the terms of the revised BSD
// license.  You should have received a copy of this license along
// with this source code in a file named "LICENSE."
//
////////////////////////////////////////////////////////////////////

#ifndef PPINSTANCE_H
#define PPINSTANCE_H

#include "nppanda3d_common.h"
#include "fileSpec.h"
#include "get_tinyxml.h"
#include "p3d_lock.h"

#include <vector>

class PPToplevelObject;
class PPDownloadRequest;

////////////////////////////////////////////////////////////////////
//       Class : PPInstance
// Description : This represents a single instance of the Panda3D
//               plugin, via the NPAPI interface.  This instance
//               brokers the communication with the P3D Core API, as
//               defined in the plugin directory.
////////////////////////////////////////////////////////////////////
class PPInstance {
public:
  PPInstance(NPMIMEType pluginType, NPP instance, uint16 mode, 
             int16 argc, char *argn[], char *argv[], NPSavedData *saved);
  ~PPInstance();

  void begin();

  inline NPP get_npp_instance() const;

  inline const NPWindow *get_window() const;
  void set_window(NPWindow *window);
  NPError new_stream(NPMIMEType type, NPStream *stream, 
                     bool seekable, uint16 *stype);
  int write_stream(NPStream *stream, int offset, int len, void *buffer);
  NPError destroy_stream(NPStream *stream, NPReason reason);
  void url_notify(const char *url, NPReason reason, void *notifyData);
  void stream_as_file(NPStream *stream, const char *fname);

  void handle_request(P3D_request *request);
  static void generic_browser_call();

  bool handle_event(void *event);

  NPObject *get_panda_script_object();

  void p3dobj_to_variant(NPVariant *result, P3D_object *object);
  P3D_object *variant_to_p3dobj(const NPVariant *variant);

  static void output_np_variant(ostream &out, const NPVariant &result);

private:
  void find_host(TiXmlElement *xcontents);
  void read_xhost(TiXmlElement *xhost);
  void add_mirror(string mirror_url);
  void choose_random_mirrors(vector<string> &result, int num_mirrors);

  static void request_ready(P3D_instance *instance);

  void start_download(const string &url, PPDownloadRequest *req);
  void downloaded_file(PPDownloadRequest *req, const string &filename);
  static string get_filename_from_url(const string &url);
  void feed_file(PPDownloadRequest *req, const string &filename);

  bool read_contents_file(const string &contents_filename);
  void get_core_api(TiXmlElement *xpackage);
  void downloaded_plugin(const string &filename);
  void do_load_plugin();

  void create_instance();
  void send_window();
  void cleanup_window();
  bool copy_file(const string &from_filename, const string &to_filename);

  static void handle_request_loop();
  static void browser_sync_callback(void *);

#ifdef _WIN32
  static LONG 
  window_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam);
#endif  // _WIN32

private:
  NPP _npp_instance;
  unsigned int _npp_mode;
  typedef vector<P3D_token> Tokens;
  Tokens _tokens;

  string _root_dir;
  string _download_url_prefix;
  typedef vector<string> Mirrors;
  Mirrors _mirrors;

  // A list of URL's that we will attempt to download the core API
  // from.
  typedef vector<string> CoreUrls;
  CoreUrls _core_urls;

  FileSpec _core_api_dll;

  bool _got_instance_url;
  string _instance_url;

  // This class is used for feeding local files (accessed via a
  // "file://" url) into the core API.
  class StreamingFileData {
  public:
    StreamingFileData(PPDownloadRequest *req, const string &filename,
                      P3D_instance *p3d_inst);
    ~StreamingFileData();

    bool is_done() const;

  private:
    void thread_run();
    THREAD_CALLBACK_DECLARATION(PPInstance::StreamingFileData, thread_run);

  private:
    bool _thread_done;
    bool _thread_continue;

    P3D_instance *_p3d_inst;
    int _user_id;
    string _filename;
    ifstream _file;
    size_t _file_size;
    size_t _total_count;

    THREAD _thread;
  };

  typedef vector<StreamingFileData *> FileDatas;
  static FileDatas _file_datas;
  
  bool _got_window;
  NPWindow _window;
#ifdef _WIN32
  LONG_PTR _orig_window_proc;
#endif  // _WIN32

  bool _python_window_open;

  PPToplevelObject *_script_object;

  P3D_instance *_p3d_inst;
};

#include "ppInstance.I"

#endif