/*
 * evolution-windows-sens.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 */

#ifdef __cplusplus
extern "C" {
#endif

#define INITGUID
#include <windows.h>
#include <eventsys.h>
#include <sensevts.h>
#include <rpc.h>
#include <stdio.h>

#include <shell/e-shell.h>
#include <e-util/e-extension.h>

#define NUM_ELEMENTS(x) (sizeof((x)) / sizeof((x)[0]))

inline const BSTR
_mb2wchar (const char* a)
{
	static WCHAR b[64];
	MultiByteToWideChar (0, 0, a, -1, b, 64);
	return b;
}

static const char* add_curly_braces_to_uuid (const char* string_uuid)
{
	static char curly_braced_uuid_string[64];
	unsigned i;
	if (!string_uuid)
		return NULL;
	curly_braced_uuid_string[0]='{';
	for (i=0; i<strlen(string_uuid) && i<60; i++)
		curly_braced_uuid_string[i+1] = string_uuid[i];
	curly_braced_uuid_string[i+1] = '}';
	curly_braced_uuid_string[i+2] = '\0';
	return curly_braced_uuid_string;
}	
	

/* Standard GObject macros */
#define E_TYPE_WINDOWS_SENS \
	(e_windows_sens_get_type ())
#define E_WINDOWS_SENS(obj) \
	(G_TYPE_CHECK_INSTANCE_CAST \
	((obj), E_TYPE_WINDOWS_SENS, EWindowsSENS))

typedef struct _EWindowsSENS EWindowsSENS;
typedef struct _EWindowsSENSClass EWindowsSENSClass;

struct _EWindowsSENS {
	EExtension parent;
};

struct _EWindowsSENSClass {
	EExtensionClass parent_class;
};

/* Module Entry Points */
void e_module_load (GTypeModule *type_module);
void e_module_unload (GTypeModule *type_module);

/* Forward Declarations */
GType e_windows_sens_get_type (void);

G_DEFINE_DYNAMIC_TYPE (EWindowsSENS, e_windows_sens, E_TYPE_EXTENSION)

static EShell *
windows_sens_get_shell (EWindowsSENS *extension)
{
	EExtensible *extensible;

	extensible = e_extension_get_extensible (E_EXTENSION (extension));

	return E_SHELL (extensible);
}

class e_sens_network_listener : public ISensNetwork
{
private:
	long ref;
	EWindowsSENS *mpEWS;

public:
	e_sens_network_listener (EWindowsSENS *ews) :
		ref(1),
		mpEWS(ews)
	{}

	HRESULT WINAPI QueryInterface (REFIID iid, void ** ppv)
	{
		if (IsEqualIID (iid, IID_IUnknown) || IsEqualIID (iid, IID_IDispatch) || IsEqualIID (iid, IID_ISensNetwork)) {
			*ppv = this;
			AddRef();
			return S_OK;
		}
		*ppv = NULL;
		return E_NOINTERFACE;
	}

	ULONG WINAPI AddRef ()
	{
		return InterlockedIncrement (&ref);
	}

	ULONG WINAPI Release ()
	{
		int tmp = InterlockedDecrement (&ref);
		return tmp;
	}

	HRESULT WINAPI GetTypeInfoCount (unsigned FAR*)
	{
		return E_NOTIMPL;
	}

	HRESULT WINAPI GetTypeInfo (unsigned, LCID, ITypeInfo FAR* FAR*)
	{
		return E_NOTIMPL;
	}

	HRESULT WINAPI GetIDsOfNames (REFIID, OLECHAR FAR* FAR*, unsigned, LCID, DISPID FAR*)
	{
		return E_NOTIMPL;
	}

	HRESULT WINAPI Invoke (DISPID, REFIID, LCID, WORD, DISPPARAMS FAR*, VARIANT FAR*, EXCEPINFO FAR*, unsigned FAR*)
	{
		return E_NOTIMPL;
	}

// ISensNetwork methods:
	virtual HRESULT WINAPI ConnectionMade (BSTR, ULONG ulType, LPSENS_QOCINFO)
	{
		if (ulType) {
			EShell *shell = windows_sens_get_shell (mpEWS);
			e_shell_set_network_available (shell, TRUE);
		}
		return S_OK;
	}

	virtual HRESULT WINAPI ConnectionMadeNoQOCInfo (BSTR, ULONG)
	{
		//Always followed by ConnectionMade
		return S_OK;
	}

	virtual HRESULT WINAPI ConnectionLost (BSTR, ULONG ulType)
	{
		if (ulType) {
			EShell *shell = windows_sens_get_shell (mpEWS);
			e_shell_set_network_available (shell, FALSE);
		}
		return S_OK;
	}

	virtual HRESULT WINAPI DestinationReachable (BSTR, BSTR , ULONG ulType, LPSENS_QOCINFO)
	{
		if (ulType) {
			EShell *shell = windows_sens_get_shell (mpEWS);
			e_shell_set_network_available (shell, TRUE);
		}
		return S_OK;
	}

	virtual HRESULT WINAPI DestinationReachableNoQOCInfo (BSTR, BSTR, ULONG)
	{
		return S_OK;
	}
};

/* 4E14FB9F-2E22-11D1-9964-00C04FBBB345 */
DEFINE_GUID(IID_IEventSystem, 0x4E14FB9F, 0x2E22, 0x11D1, 0x99, 0x64, 0x00, 0xC0, 0x4F, 0xBB, 0xB3, 0x45);

/* 4A6B0E15-2E38-11D1-9965-00C04FBBB345 */
DEFINE_GUID(IID_IEventSubscription, 0x4A6B0E15, 0x2E38, 0x11D1, 0x99, 0x65, 0x00, 0xC0, 0x4F, 0xBB, 0xB3, 0x45);

/* d597bab1-5b9f-11d1-8dd2-00aa004abd5e */
DEFINE_GUID(IID_ISensNetwork, 0xd597bab1, 0x5b9f, 0x11d1, 0x8d, 0xd2, 0x00, 0xaa, 0x00, 0x4a, 0xbd, 0x5e);

/* 4E14FBA2-2E22-11D1-9964-00C04FBBB345 */
DEFINE_GUID(CLSID_CEventSystem, 0x4E14FBA2, 0x2E22, 0x11D1, 0x99, 0x64, 0x00, 0xC0, 0x4F, 0xBB, 0xB3, 0x45);

/* 7542e960-79c7-11d1-88f9-0080c7d771bf */
DEFINE_GUID(CLSID_CEventSubscription, 0x7542e960, 0x79c7, 0x11d1, 0x88, 0xf9, 0x00, 0x80, 0xc7, 0xd7, 0x71, 0xbf);

static void
windows_sens_constructed (GObject *object)
{
	static IEventSystem *pIEventSystem =0;
	static IEventSubscription* pIEventSubscription = 0;
	static const char* eventclassid="{D5978620-5B9F-11D1-8DD2-00AA004ABD5E}";
	static const char* methods[]={"ConnectionMade","ConnectionMadeNoQOCInfo","ConnectionLost","DestinationReachable","DestinationReachableNoQOCInfo"};
	static const char* names[]={"EWS_ConnectionMade","EWS_ConnectionMadeNoQOCInfo","EWS_ConnectionLost","EWS_DestinationReachable","EWS_DestinationReachableNoQOCInfo"};
	unsigned char* subids[] = { 0, 0, 0, 0, 0 };

	EWindowsSENS *extension = (E_WINDOWS_SENS (object));
	static e_sens_network_listener *pISensNetwork = new e_sens_network_listener (extension);

	CoInitialize(0);

	HRESULT res=CoCreateInstance (CLSID_CEventSystem, 0,CLSCTX_SERVER,IID_IEventSystem,(void**)&pIEventSystem);

	if (res == S_OK && pIEventSystem) {

		for (unsigned i=0; i<NUM_ELEMENTS(methods); i++) {

			res=CoCreateInstance (CLSID_CEventSubscription, 0, CLSCTX_SERVER, IID_IEventSubscription, (LPVOID*)&pIEventSubscription);

			if (res == S_OK && pIEventSubscription) {
				UUID tmp_uuid;
				UuidCreate(&tmp_uuid);
				UuidToString(&tmp_uuid, &subids[i]);
				if ((res=pIEventSubscription->put_SubscriptionID (_mb2wchar (add_curly_braces_to_uuid ((char*)subids[i]))))) {
					RpcStringFree (&subids[i]);
					break;
				}
				RpcStringFree (&subids[i]);
				if ((res=pIEventSubscription->put_SubscriptionName (_mb2wchar (names[i]))))
					break;
				if ((res=pIEventSubscription->put_MethodName (_mb2wchar (methods[i]))))
					break;
				if ((res=pIEventSubscription->put_EventClassID (_mb2wchar (eventclassid))))
					break;
				if ((res=pIEventSubscription->put_SubscriberInterface ((IUnknown*)pISensNetwork)))
					break;
				/* Make the subscription receive the event only if the owner of the subscription
				 * is logged on to the same computer as the publisher. This makes this module
				 * work with normal user account without administrative privileges.
				 */
				if ((res=pIEventSubscription->put_PerUser (TRUE)))
					break;

				if ((res=pIEventSystem->Store ((BSTR)PROGID_EventSubscription, (IUnknown*)pIEventSubscription)))
					break;
				pIEventSubscription->Release ();
				pIEventSubscription=0;
			}
		}
		if (pIEventSubscription)
		pIEventSubscription->Release();
	}
	
	/* Do not try to get initial state when we are sure we will not get system events.
	 * Like that we don't get stuck with Disconnected status if we were disconnected
	 * on start.
	 */
	if (res == S_OK) {

		typedef BOOL (WINAPI* IsNetworkAlive_t) (LPDWORD);

		IsNetworkAlive_t pIsNetworkAlive = NULL;

		HMODULE hDLL=LoadLibrary ("sensapi.dll");

		BOOL alive = TRUE;
		if ((pIsNetworkAlive=(IsNetworkAlive_t) GetProcAddress (hDLL, "IsNetworkAlive"))) {
			DWORD Network;
			alive=pIsNetworkAlive (&Network);
		}

		FreeLibrary(hDLL);

		EShell *shell = windows_sens_get_shell (extension);

		e_shell_set_network_available (shell, alive);
	}
}

static void
e_windows_sens_class_init (EWindowsSENSClass *_class)
{
	GObjectClass *object_class;
	EExtensionClass *extension_class;

	object_class = G_OBJECT_CLASS (_class);
	object_class->constructed = windows_sens_constructed;

	extension_class = E_EXTENSION_CLASS (_class);
	extension_class->extensible_type = E_TYPE_SHELL;
}

static void
e_windows_sens_class_finalize (EWindowsSENSClass *_class)
{
}

static void
e_windows_sens_init (EWindowsSENS *extension)
{
}

G_MODULE_EXPORT void
e_module_load (GTypeModule *type_module)
{
	e_windows_sens_register_type (type_module);
}

G_MODULE_EXPORT void
e_module_unload (GTypeModule *type_module)
{
}

#ifdef __cplusplus
}
#endif