#ifdef HAVE_UNISTD_H
#  include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#  include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#  include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#  include <strings.h>
#endif
#ifdef HAVE_DLFCN_H
#  include <dlfcn.h>
#endif
#ifdef HAVE_DL_H
#  include <dl.h>
#endif
#ifdef _WIN32

	CK_SLOT_ID session_slot;
	CK_SESSION_HANDLE session;
};

/*
 * Tcl <--> PKCS11 Bridge Functions
 */ 
MODULE_SCOPE Tcl_Obj *tclpkcs11_pkcs11_error(CK_RV errorCode) {
	switch (errorCode) {
		case CKR_OK:
			return(Tcl_NewStringObj("PKCS11_OK OK", -1));
		case CKR_CANCEL:
			return(Tcl_NewStringObj("PKCS11_ERROR CANCEL", -1));
		case CKR_HOST_MEMORY:
			return(Tcl_NewStringObj("PKCS11_ERROR HOST_MEMORY", -1));

		case CKR_VENDOR_DEFINED:
			return(Tcl_NewStringObj("PKCS11_ERROR VENDOR_DEFINED", -1));
	}

	return(Tcl_NewStringObj("PKCS11_ERROR UNKNOWN", -1));
}

MODULE_SCOPE Tcl_Obj *tclpkcs11_bytearray_to_string(const unsigned char *data, unsigned long datalen) {
	unsigned long idx;
	Tcl_Obj *retval;

	retval = Tcl_NewObj();

	if (data == NULL) {
		return(retval);
	}

	for (idx = 0; idx < datalen; idx++) {
		Tcl_AppendObjToObj(retval, Tcl_ObjPrintf("%02x", data[idx]));
	}

	return(retval);
}

MODULE_SCOPE unsigned long tclpkcs11_string_to_bytearray(Tcl_Obj *data, unsigned char *outbuf, unsigned long outbuflen) {
	unsigned long outbufidx = 0;
	char tmpbuf[5];
	char *str;
	int tmpint;
	int tcl_rv;

	if (outbuf == NULL) {

		}
	}

	return(outbufidx);
}

/* PKCS#11 Mutex functions implementation that use Tcl Mutexes */
MODULE_SCOPE CK_RV tclpkcs11_create_mutex(void **mutex) {
	Tcl_Mutex *retval;

	if (!mutex) {
		return(CKR_GENERAL_ERROR);
	}

	retval = (Tcl_Mutex *) ckalloc(sizeof(*retval));
	memset(retval, 0, sizeof(*retval));

	*mutex = retval;

	return(CKR_OK);
}

MODULE_SCOPE CK_RV tclpkcs11_lock_mutex(void *mutex) {
	if (!mutex) {
		return(CKR_GENERAL_ERROR);
	}

	Tcl_MutexLock(*mutex);

	return(CKR_OK);
}

MODULE_SCOPE CK_RV tclpkcs11_unlock_mutex(void *mutex) {
	if (!mutex) {
		return(CKR_GENERAL_ERROR);
	}

	Tcl_MutexUnlock(*mutex);

	return(CKR_OK);
}

MODULE_SCOPE CK_RV tclpkcs11_destroy_mutex(void *mutex) {
	if (!mutex) {
		return(CKR_GENERAL_ERROR);
	}

	Tcl_MutexFinalize(*mutex);
	ckfree(mutex);

	return(CKR_OK);
}

/* Convience function to start a session if one is not already active */
MODULE_SCOPE int tclpkcs11_start_session(struct tclpkcs11_handle *handle, CK_SLOT_ID slot) {
	CK_SESSION_HANDLE tmp_session;
	CK_RV chk_rv;

	if (handle->session != -1) {
		if (handle->session_slot == slot) {
			return(CKR_OK);
		}

	handle->session = tmp_session;
	handle->session_slot = slot;

	return(CKR_OK);
}

MODULE_SCOPE int tclpkcs11_close_session(struct tclpkcs11_handle *handle) {
	CK_RV chk_rv;

	if (handle->session != -1) {
		chk_rv = handle->pkcs11->C_CloseSession(handle->session);
		handle->session = -1;
		handle->session_slot = -1;

		if (chk_rv != CKR_OK) {
			return(chk_rv);
		}
	}

	return(CKR_OK);
}

/*
 * Platform Specific Functions 
 */
MODULE_SCOPE void *tclpkcs11_int_load_module(const char *pathname) {
#if defined(TCL_INCLUDES_LOADFILE)
	int tcl_rv;
	Tcl_LoadHandle *new_handle;

	new_handle = (Tcl_LoadHandle *) ckalloc(sizeof(*new_handle));

	tcl_rv = Tcl_LoadFile(NULL, Tcl_NewStringObj(pathname, -1), NULL, 0, NULL, new_handle);

#elif defined(HAVE_SHL_LOAD)
	return(shl_load(pathname, BIND_DEFERRED, 0L));
#elif defined(_WIN32)
	return(LoadLibrary(pathname));
#endif
	return(NULL);
}
MODULE_SCOPE void tclpkcs11_int_unload_module(void *handle) {
#if defined(TCL_INCLUDES_LOADFILE)
	Tcl_LoadHandle *tcl_handle;

	tcl_handle = handle;

	Tcl_FSUnloadFile(NULL, *tcl_handle);

	ckfree(handle);
#elif defined(HAVE_DLOPEN)
	dlclose(handle);
#elif defined(HAVE_SHL_LOAD)
	shl_unload(handle);
#elif defined(_WIN32)
	FreeLibrary(handle);
#endif
	return;
}
MODULE_SCOPE void *tclpkcs11_int_lookup_sym(void *handle, const char *sym) {
#if defined(TCL_INCLUDES_LOADFILE)
	Tcl_LoadHandle *tcl_handle;
	void *retval;

	tcl_handle = handle;

	retval = Tcl_FindSymbol(NULL, *tcl_handle, sym);

#endif
	return(NULL);
}

/*
 * Tcl Commands
 */
MODULE_SCOPE int tclpkcs11_load_module(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	struct tclpkcs11_interpdata *interpdata;
	struct tclpkcs11_handle *new_handle;
	const char *pathname;
	Tcl_HashEntry *tcl_handle_entry;
	Tcl_Obj *tcl_handle;
	void *handle;


	int is_new_entry;

	CK_C_INITIALIZE_ARGS initargs;
	CK_RV (*getFuncList)(CK_FUNCTION_LIST_PTR_PTR ppFunctionList);
	CK_FUNCTION_LIST_PTR pkcs11_function_list;
	CK_RV chk_rv;

		Tcl_SetObjResult(interp, tclpkcs11_pkcs11_error(chk_rv));

		return(TCL_ERROR);
	}

	interpdata = (struct tclpkcs11_interpdata *) cd;

	tcl_handle = Tcl_ObjPrintf("pkcsmod%lu", interpdata->handles_idx);
	(interpdata->handles_idx)++;







	tcl_handle_entry = Tcl_CreateHashEntry(&interpdata->handles, (const char *) tcl_handle, &is_new_entry);
	if (!tcl_handle_entry) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj("unable to create new hash entry", -1));

		return(TCL_ERROR);
	}

	Tcl_SetHashValue(tcl_handle_entry, (ClientData) new_handle);

	Tcl_SetObjResult(interp, tcl_handle);

	return(TCL_OK);
}

MODULE_SCOPE int tclpkcs11_unload_module(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	struct tclpkcs11_interpdata *interpdata;
	struct tclpkcs11_handle *handle;
	Tcl_HashEntry *tcl_handle_entry;
	Tcl_Obj *tcl_handle;

	CK_RV chk_rv;

	ckfree((char *) handle);

	Tcl_SetObjResult(interp, Tcl_NewBooleanObj(1));

	return(TCL_OK);
}

MODULE_SCOPE int tclpkcs11_list_slots(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	struct tclpkcs11_interpdata *interpdata;
	struct tclpkcs11_handle *handle;
	Tcl_HashEntry *tcl_handle_entry;
	Tcl_Obj *tcl_handle;
	Tcl_Obj *ret_list, *curr_item_list, *flags_list, *slot_desc;

	CK_SLOT_ID_PTR slots;

	}

	Tcl_SetObjResult(interp, ret_list);

	return(TCL_OK);
}

MODULE_SCOPE int tclpkcs11_list_certs(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	struct tclpkcs11_interpdata *interpdata;
	struct tclpkcs11_handle *handle;
	Tcl_HashEntry *tcl_handle_entry;
	Tcl_Obj *tcl_handle, *tcl_slotid;
	long slotid_long;
	Tcl_Obj *obj_label, *obj_cert, *obj_id;
	Tcl_Obj *ret_list, *curr_item_list;

	/* Return */
	Tcl_SetObjResult(interp, ret_list);

	return(TCL_OK);
}

MODULE_SCOPE int tclpkcs11_login(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	struct tclpkcs11_interpdata *interpdata;
	struct tclpkcs11_handle *handle;
	Tcl_HashEntry *tcl_handle_entry;
	Tcl_Obj *tcl_handle, *tcl_slotid, *tcl_password;
	long slotid_long;
	char *password;
	int password_len;

			return(TCL_ERROR);
	}

	return(TCL_OK);
}

MODULE_SCOPE int tclpkcs11_logout(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	struct tclpkcs11_interpdata *interpdata;
	struct tclpkcs11_handle *handle;
	Tcl_HashEntry *tcl_handle_entry;
	Tcl_Obj *tcl_handle, *tcl_slotid;
	long slotid_long;
	int tcl_rv;

	}

	Tcl_SetObjResult(interp, Tcl_NewBooleanObj(1));

	return(TCL_OK);
}

MODULE_SCOPE int tclpkcs11_perform_pki(int encrypt, ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	struct tclpkcs11_interpdata *interpdata;
	struct tclpkcs11_handle *handle;
	unsigned char *input, resultbuf[1024];
	unsigned long tcl_strtobytearray_rv;
	Tcl_HashEntry *tcl_handle_entry;
	Tcl_Obj *pki_real_cmd;
	Tcl_Obj *tcl_keylist, **tcl_keylist_values, *tcl_keylist_key, *tcl_keylist_val;

	tcl_result = Tcl_NewByteArrayObj(resultbuf, resultbuf_len);

	Tcl_SetObjResult(interp, tcl_result);

	return(TCL_OK);
}

MODULE_SCOPE int tclpkcs11_encrypt(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	return(tclpkcs11_perform_pki(1, cd, interp, objc, objv));
}

MODULE_SCOPE int tclpkcs11_decrypt(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	return(tclpkcs11_perform_pki(0, cd, interp, objc, objv));
}

/*
 * Tcl Loadable Module Initialization
 */
int Tclpkcs11_Init(Tcl_Interp *interp) {
	struct tclpkcs11_interpdata *interpdata;
	Tcl_Command tclCreatComm_ret;
	const char *tclPkgReq_ret;
	int tclPkgProv_ret;

#ifdef TCL_USE_STUBS
	const char *tclInitStubs_ret;

	/* Initialize Stubs */
	tclInitStubs_ret = Tcl_InitStubs(interp, "8.4", 0);
	if (!tclInitStubs_ret) {
		return(TCL_ERROR);
	}
#endif

	tclPkgReq_ret = Tcl_PkgRequire(interp, "pki", "0.1", 0);
	if (!tclPkgReq_ret) {
		return(TCL_ERROR);
	}

	interpdata = (struct tclpkcs11_interpdata *) ckalloc(sizeof(*interpdata));