
import struct, sys, time


class Enumeration(object):
    def __init__(self, id, name):
        self._id = id
        self._name = name
        setattr(self.__class__, name, self)
        self.map[id] = self

    def __int__(self):
        return self.id

    def __repr__(self):
        return self.name

    @property
    def id(self):
        return self._id

    @property
    def name(self):
        return self._name

    @classmethod
    def create_from_map(cls):
        for id, name in cls.map.iteritems():
            cls(id, name)
        
class Request(Enumeration):
    map = {
        0: 'DETACH',
        1: 'DNLOAD',
        2: 'UPLOAD',
        3: 'GETSTATUS',
        4: 'CLRSTATUS',
        5: 'GETSTATE',
        6: 'ABORT',
    }

Request.create_from_map()

class State(Enumeration):
    map = {
         0: 'appIDLE',
         1: 'appDETACH',
         2: 'dfuIDLE',
         3: 'dfuDNLOAD_SYNC',
         4: 'dfuDNBUSY',
         5: 'dfuDNLOAD_IDLE',
         6: 'dfuMANIFEST_SYNC',
         7: 'dfuMANIFEST',
         8: 'dfuMANIFEST_WAIT_RESET',
         9: 'dfuUPLOAD_IDLE',
        10: 'dfuERROR',
    }

State.create_from_map()

class Status(Enumeration):
    map = {
        0x00: 'OK',
        0x01: 'errTARGET',
        0x02: 'errFILE',
        0x03: 'errWRITE',
        0x04: 'errERASE',
        0x05: 'errCHECK_ERASED',
        0x06: 'errPROG',
        0x07: 'errVERIFY',
        0x08: 'errADDRESS',
        0x09: 'errNOTDONE',
        0x0A: 'errFIRMWARE',
        0x0B: 'errVENDOR',
        0x0C: 'errUSBR',
        0x0D: 'errPOR',
        0x0E: 'errUNKNOWN',
        0x0F: 'errSTALLEDPKT',
    }

Status.create_from_map()



class DFU(object):
    verbose=False;
    def __init__(self, device, alt):
        device.set_interface_altsetting(interface = 0, alternate_setting = alt)
        self._device = device

    def detach(self):
        """Detaches from the DFU target."""
        self._device.ctrl_transfer(0x21, Request.DETACH, 0, 0, None)
    def get_string(self,i=0):
        """Gets a USB descriptor string, to distinguish firmware types."""
        import usb;

        #Linux and Mac have different calling conventions for usb.util.get_string(),
        #so we'll try each of them and hope for the best.
        try:
            #Mac calling convention.
            return usb.util.get_string(self._device,255,i,None);
        except:
            #Linux calling convention.
            return usb.util.get_string(self._device,i,None);
    def bcd(self,b):
        """Converts a byte from BCD to integer."""
        return int("%02x"%b);
    def get_time(self):
        """Returns a datetime object for the radio's current time."""
        self.md380_custom(0x91,0x01); #Programming Mode
        self.md380_custom(0xA2,0x08); #Access the clock memory.
        time=self.upload(0,7);  #Read the time bytes as BCD.
        #hexdump("Time is: "+time);
        from datetime import datetime;
        dt=datetime(self.bcd(time[0])*100+self.bcd(time[1]),
                             self.bcd(time[2]),
                             self.bcd(time[3]),
                             self.bcd(time[4]),
                             self.bcd(time[5]),
                             self.bcd(time[6]));
        return dt;


    def set_time(self):
        from datetime import datetime
        dt = datetime.strftime(datetime.now(), '%Y%m%d%H%M%S').decode("hex")
        self.md380_custom(0x91,0x02);
        self.download(0, "\xb5"+dt)
        self.wait_till_ready()
        self.md380_reboot()        


    def download(self, block_number, data):
        self._device.ctrl_transfer(0x21, Request.DNLOAD, block_number, 0, data)
        #time.sleep(0.1);
    def set_address(self, address):
        a=address       &0xFF
        b=(address>>8)  &0xFF
        c=(address>>16) &0xFF
        d=(address>>24) &0xFF
        self._device.ctrl_transfer(0x21, Request.DNLOAD, 0, 0, [0x21, a, b, c, d])
        self.get_status(); #this changes state
        status=self.get_status(); #this gets the status
        if status[2]==State.dfuDNLOAD_IDLE:
            if self.verbose: print "Set pointer to 0x%08x." % address;
            self.enter_dfu_mode();
        else:
            if self.verbose: print "Failed to set pointer."
            return False;
        return True;
    def erase_block(self, address):
        a=address       &0xFF
        b=(address>>8)  &0xFF
        c=(address>>16) &0xFF
        d=(address>>24) &0xFF
        self._device.ctrl_transfer(0x21, Request.DNLOAD, 0, 0, [0x41, a, b, c, d])
        #time.sleep(0.5);
        self.get_status(); #this changes state
        status=self.get_status(); #this gets the status
        if status[2]==State.dfuDNLOAD_IDLE:
            if self.verbose: print "Erased 0x%08x." % address;
            self.enter_dfu_mode();
        else:
            if self.verbose: print "Failed to erase block."
            return False;
        return True;

    def md380_custom(self, a,b):
        """Sends a secret MD380 command."""
        a=a&0xFF
        b=b&0xFF
        self._device.ctrl_transfer(0x21, Request.DNLOAD, 0, 0, [a,b])
        self.get_status(); #this changes state
        time.sleep(0.1);
        status=self.get_status(); #this gets the status
        if status[2]==State.dfuDNLOAD_IDLE:
            if self.verbose: print "Sent custom %02x %02x." % (a,b);
            self.enter_dfu_mode();
        else:
            print "Failed to send custom %02x %02x." % (a,b);
            return False;
        return True;
    
    def md380_reboot(self):
        """Sends the MD380's secret reboot command.""";
        a=0x91;
        b=0x05;
        self._device.ctrl_transfer(0x21, Request.DNLOAD, 0, 0, [a,b])
        try:
            self.get_status(); #this changes state
        except:
            pass;
        return True;

    def upload(self, block_number, length, index=0):
        if self.verbose: print "Fetching block 0x%x."%block_number
        data = self._device.ctrl_transfer(0xA1, #request type
                                          Request.UPLOAD, #request
                                          block_number, #wValue
                                          index,            #index
                                          length)       #length
        return data
    
    def get_command(self):
        data = self._device.ctrl_transfer(0xA1, #request type
                                          Request.UPLOAD, #request
                                          0, #wValue
                                          0, #index
                                          32) #length
        self.get_status();
        return data
    
    def get_status(self):
        status_packed = self._device.ctrl_transfer(0xA1, Request.GETSTATUS, 0, 0, 6)
        status = struct.unpack('<BBBBBB', status_packed)
        return (Status.map[status[0]], (((status[1] << 8) | status[2]) << 8) | status[3],
                State.map[status[4]], status[5])


    def clear_status(self):
        self._device.ctrl_transfer(0x21, Request.CLRSTATUS, 0, 0, None)

    def get_state(self):
        state_packed = self._device.ctrl_transfer(0xA1, Request.GETSTATE, 0, 0, 1)
        return State.map[struct.unpack('<B', state_packed)[0]]

    def abort(self):
        self._device.ctrl_transfer(0x21, Request.ABORT, 0, 0, None)

    def wait_till_ready(self,desired_state=State.dfuIDLE):
        state = 11
        status, timeout, state, discarded = self.get_status()
        while state != State.dfuIDLE:
            self.clear_status()
            status, timeout, state, discarded = self.get_status()
        return


    def enter_dfu_mode(self):
        action_map = {
            State.dfuDNLOAD_SYNC: self.abort,
            State.dfuDNLOAD_IDLE: self.abort,
            State.dfuMANIFEST_SYNC: self.abort,
            State.dfuUPLOAD_IDLE: self.abort,
            State.dfuERROR: self.clear_status,
            State.appIDLE: self.detach,
            State.appDETACH: self._wait,
            State.dfuDNBUSY: self._wait,
            State.dfuMANIFEST: self.abort,
            State.dfuMANIFEST_WAIT_RESET: self._wait,
            State.dfuIDLE: self._wait
        }
        
        while True:
            state = self.get_state()
            if state == State.dfuIDLE:
                break
            action = action_map[state]
            action()

    def _wait(self):
        time.sleep(0.1)
    
    def widestr(self,str):
        tr="";
        for c in str:
            tr=tr+c+"\0";
        return tr+"\0\0";

