/////////////////////////////////////////////////////////////////////////////
// Name:        wx/net.h
// Purpose:     Network related wxWindows classes and functions
// Author:      Vadim Zeitlin
// Modified by:
// Created:     07.07.99
// RCS-ID:      $Id$
// Copyright:   (c) Vadim Zeitlin
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_NET_H
#define _WX_NET_H

#if wxUSE_DIALUP_MANAGER

// ----------------------------------------------------------------------------
// A class which groups functions dealing with connecting to the network from a
// workstation using dial-up access to the net. There is at most one instance
// of this class in the program accessed via GetDialUpManager().
// ----------------------------------------------------------------------------

/* TODO
 *
 * 1. more configurability for Unix: i.e. how to initiate the connection, how
 *    to check for online status, &c.
 * 2. add a "long Dial(long connectionId = -1)" function which asks the user
 *    about which connection to dial (this may be done using native dialogs
 *    under NT, need generic dialogs for all others) and returns the identifier
 *    of the selected connection (it's opaque to the application) - it may be
 *    reused later to dial the same connection later (or use strings instead of
 *    longs may be?)
 * 3. add an async version of dialing functions which notify the caller about
 *    the progress (or may be even start another thread to monitor it)
 * 4. the static creation/accessor functions are not MT-safe - but is this
 *    really crucial? I think we may suppose they're always called from the
 *    main thread?
 */

class WXDLLEXPORT wxDialUpManager
{
public:
    // get the pointer to the global wxDialUpManager object
    static wxDialUpManager *Get()
    {
        if ( !ms_dialUpManager )
        {
            ms_dialUpManager = Create();
        }

        return ms_dialUpManager;
    }

    // could the dialup manager be initialized correctly? If this function
    // returns FALSE, no other functions will work neither, so it's a good idea
    // to call this function and check its result before calling any other
    // wxDialUpManager methods
    virtual bool IsOk() const = 0;

    // virtual dtor for any base class
    virtual ~wxDialUpManager() { }

    // operations
    // ----------

    // the simplest way to initiate a dial up: this function dials the given
    // ISP (exact meaning of the parameter depends on the platform), returns
    // TRUE on success or FALSE on failure and logs the appropriate error
    // message in the latter case.
    virtual bool Dial(const wxString& nameOfISP,
                      const wxString& username,
                      const wxString& password) = 0;

    // hang up the currently active dial up connection
    virtual bool HangUp() = 0;

    // online status
    // -------------

    // returns TRUE if the computer is connected to the network: under Windows,
    // this just means that a RAS connection exists, under Unix we check that
    // the "well-known host" (as specified by SetWellKnownHost) is reachable
    virtual bool IsOnline() = 0;

    // sometimes the built-in logic for determining the online status may fail,
    // so, in general, the user should be allowed to override it. This function
    // allows to forcefully set the online status - whatever our internal
    // algorithm may think about it.
    virtual void SetOnlineStatus(bool isOnline = TRUE) = 0;

    // set misc wxDialUpManager options
    // --------------------------------

    // enable automatical checks for the connection status and sending of
    // wxEVT_DIALUP_CONNECTED/wxEVT_DIALUP_DISCONNECTED events. The interval
    // parameter is only for Unix where we do the check manually: under
    // Windows, the notification about the change of connection status is
    // instantenous.
    //
    // Returns FALSE if couldn't set up automatic check for online status.
    virtual bool EnableAutoCheckOnlineStatus(size_t nSeconds = 60) = 0;

    // disable automatic check for connection status change - notice that the
    // wxEVT_DIALUP_XXX events won't be sent any more neither.
    virtual void DisableAutoCheckOnlineStatus() = 0;

    // under Unix, the value of well-known host is used to check whether we're
    // connected to the internet. It's unused under Windows, but this function
    // is always safe to call. The default value is www.yahoo.com.
    virtual void SetWellKnownHost(const wxString& hostname) = 0;

private:
    friend class WXDLLEXPORT wxApp;

    // only for wxApp usage: clean up.
    static void Delete()
    {
        if ( ms_dialUpManager )
        {
            delete ms_dialUpManager;
            ms_dialUpManager = (wxDialUpManager *)NULL;
        }
    }

    // this function should create and return the object of the
    // platform-specific class derived from wxDialUpManager. It's implemented
    // in the platform-specific source files.
    static wxDialUpManager *Create();

    // the unique instance of this class 
    static wxDialUpManager *ms_dialUpManager;
};

// ----------------------------------------------------------------------------
// DIALUP events processing
// ----------------------------------------------------------------------------

// the event class for the dialup events
class WXDLLEXPORT wxDialUpEvent : public wxEvent
{
public:
    wxDialUpEvent(bool isConnected) : wxEvent(isConnected)
    {
        SetEventType(isConnected ? wxEVT_DIALUP_CONNECTED
                                 : wxEVT_DIALUP_DISCONNECTED);
    }

    // is this a CONNECTED or DISCONNECTED event?
    bool IsConnectedEvent() const { return m_id != 0; }
};

// the type of dialup event handler function
typedef void (wxObject::*wxDialUpEventFunction)(wxDialUpEvent&);

// macros to catch dialup events
#define EVT_DIALUP_CONNECTED(func) { wxEVT_DIALUP_CONNECTED, -1, -1, (wxObjectEventFunction) (wxEventFunction) (wxDialUpEventFunction) & func, NULL},
#define EVT_DIALUP_DISCONNECTED(func) { wxEVT_DIALUP_DISCONNECTED, -1, -1, (wxObjectEventFunction) (wxEventFunction) (wxDialUpEventFunction) & func, NULL},

#endif // wxUSE_DIALUP_MANAGER

#endif // _WX_NET_H