package serial

/*

// MSDN article on Serial Communications:
// http://msdn.microsoft.com/en-us/library/ff802693.aspx

// Arduino Playground article on serial communication with Windows API:
// http://playground.arduino.cc/Interfacing/CPPWindows

#include <stdlib.h>
#include <windows.h>

//HANDLE invalid = INVALID_HANDLE_VALUE;

HKEY INVALID_PORT_LIST = 0;

HKEY openPortList() {
	HKEY handle;
	LPCSTR lpSubKey = "HARDWARE\\DEVICEMAP\\SERIALCOMM\\";
	DWORD res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, lpSubKey, 0, KEY_READ, &handle);
	if (res != ERROR_SUCCESS)
		return INVALID_PORT_LIST;
	else
		return handle;
}

int countPortList(HKEY handle) {
	int count = 0;
	for (;;) {
		char name[256];
		DWORD nameSize = 256;
		DWORD res = RegEnumValueA(handle, count, name, &nameSize, NULL, NULL, NULL, NULL);
		if (res != ERROR_SUCCESS)
			return count;
		count++;
	}
}

char *getInPortList(HKEY handle, int i) {
	byte *data = (byte *) malloc(256);
	DWORD dataSize = 256;
	char name[256];
	DWORD nameSize = 256;
	DWORD res = RegEnumValueA(handle, i, name, &nameSize, NULL, NULL, data, &dataSize);
	if (res != ERROR_SUCCESS) {
		free(data);
		return NULL;
	}
	return data;
}

void closePortList(HKEY handle) {
	CloseHandle(handle);
}

*/
import "C"
import "syscall"
import "unsafe"

// OS dependent values

const devFolder = ""
const regexFilter = "(ttyS|ttyUSB|ttyACM|ttyAMA|rfcomm|ttyO)[0-9]{1,3}"

// opaque type that implements SerialPort interface for linux
type windowsSerialPort struct {
	Handle int
}

func GetPortsList() ([]string, error) {
	portList := C.openPortList()
	if portList == C.INVALID_PORT_LIST {
		return nil, &SerialPortError{code: ERROR_ENUMERATING_PORTS}
	}
	n := C.countPortList(portList)

	list := make([]string, n)
	for i := range list {
		portName := C.getInPortList(portList, C.int(i))
		list[i] = C.GoString(portName)
		C.free(unsafe.Pointer(portName))
	}

	C.closePortList(portList)
	return list, nil
}

func (port *windowsSerialPort) Close() error {
	return nil
}

func (port *windowsSerialPort) Read(p []byte) (n int, err error) {
	return syscall.Read(port.Handle, p)
}

func (port *windowsSerialPort) Write(p []byte) (n int, err error) {
	return syscall.Write(port.Handle, p)
}

func OpenPort(portName string, useTIOCEXCL bool) (SerialPort, error) {
	portName = "\\\\.\\" + portName

	handle, err := syscall.CreateFile(portName, syscall.GENERIC_READ|syscall.GENERIC_WRITE, 0, nil, syscall.OPEN_EXISTING, syscall.FILE_FLAG_OVERLAPPED, 0)
	//handle := C.CreateFile(C.CString(portName), C.GENERIC_READ | C.GENERIC_WRITE, 0, 0, C.OPEN_EXISTING, C.FILE_FLAG_OVERLAPPED, 0)

	/*
	   JNIEXPORT jlong JNICALL Java_jssc_SerialNativeInterface_openPort(JNIEnv *env, jobject object, jstring portName, jboolean useTIOCEXCL){
	       char prefix[] = "\\\\.\\";
	       const char* port = env->GetStringUTFChars(portName, JNI_FALSE);

	       //since 2.1.0 -> string concat fix
	       char portFullName[strlen(prefix) + strlen(port) + 1];
	       strcpy(portFullName, prefix);
	       strcat(portFullName, port);
	       //<- since 2.1.0

	       HANDLE hComm = CreateFile(portFullName,
	                          	   	  GENERIC_READ | GENERIC_WRITE,
	                          	   	  0,
	                          	   	  0,
	                          	   	  OPEN_EXISTING,
	                          	   	  FILE_FLAG_OVERLAPPED,
	                          	   	  0);
	       env->ReleaseStringUTFChars(portName, port);
	*/
	/*
		if handle != syscall.INVALID_HANDLE_VALUE {
			var dcb C.DCB
			if C.GetCommState(handle, &dcb) != 0 {
				C.CloseHandle(handle)
				return nil,
			}
		}
	*/
	/*    //since 2.3.0 ->
	    if(hComm != INVALID_HANDLE_VALUE){
	    	DCB *dcb = new DCB();
	    	if(!GetCommState(hComm, dcb)){
	    		CloseHandle(hComm);//since 2.7.0
	    		hComm = (HANDLE)jssc_SerialNativeInterface_ERR_INCORRECT_SERIAL_PORT;//(-4)Incorrect serial port
	    	}
	    	delete dcb;
	    }
	    else {
	    	DWORD errorValue = GetLastError();
	    	if(errorValue == ERROR_ACCESS_DENIED){
	    		hComm = (HANDLE)jssc_SerialNativeInterface_ERR_PORT_BUSY;//(-1)Port busy
	    	}
	    	else if(errorValue == ERROR_FILE_NOT_FOUND){
	    		hComm = (HANDLE)jssc_SerialNativeInterface_ERR_PORT_NOT_FOUND;//(-2)Port not found
	    	}
	    }
	    //<- since 2.3.0
	    return (jlong)hComm;//since 2.4.0 changed to jlong
	};

	*/
}

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