from shutil import copyfile


class ImageIntensity(DeviceBase, Readable):
    def __init__(self, image):
        DeviceBase.__init__(self, image.name + " intensity")
        self.setParent(image)

    def read(self):
        ret = self.getParent().read()        
        if ret is not None:            
            (I_sum, area_I, thresh1_count, thresh2_count, thresh3_count, thresh4_count, I_sum_bgr, area_bgr) = ret
            ret = I_sum
            #if area_bgr > 0:
            #    ret = ret - ((I_sum_bgr / area_bgr) * area_I)    
        self.setCache(ret, None)
        return ret


class ImageCorrectedIntensity(DeviceBase, Readable):
    def __init__(self, image):
        DeviceBase.__init__(self, image.name + " corrected intensity")
        self.setParent(image)

    def read(self):
        ret = self.getParent().intensity.take()         
        if ret is not None:             
            trans = transm.value    
            count_time = get_count_time()
            if (trans == 0.0) or (count_time==0):
                ret= float("nan")
            else:
                ret = ret / count_time / transm.value            
        self.setCache(ret, None)
        return ret

class ImageMatrix(ReadonlyRegisterBase, ReadonlyRegisterMatrix, Readable.IntegerType):
    def __init__(self, image):
        DeviceBase.__init__(self, "Matrix")
        self.setParent(image)
    
    def doRead(self):
        return self.getParent().get_image()
        
    def getWidth(self):
        return self.getParent().pixel.PIX_XDIM

    def getHeight(self):
        return self.getParent().pixel.PIX_YDIM
   
        


class Image(DeviceBase, Readable):
    def __init__(self, name, pixel):
        DeviceBase.__init__(self, name)
        self.pixel = pixel
        self.roi = [0,0, self.pixel.PIX_XDIM-1, self.pixel.PIX_YDIM-1]
        self.broi = [0,0, self.pixel.PIX_XDIM-1, self.pixel.PIX_YDIM-1]   
        self.intensity = ImageIntensity(self)
        self.matrix = ImageMatrix(self)
        self.corrected_intensity = ImageCorrectedIntensity(self)
        self.last_filename = None
        self.last_image = None

    
    def get_int(self, filename = None):        
        if filename is None:
            filename = self.pixel.get_image_filename()
        threshold1 = self.pixel.threshold1
        threshold2 = self.pixel.threshold2
        threshold3 = self.pixel.threshold3
        threshold4 = self.pixel.threshold4
        print "Calculating intensity for: " + filename + " - threshold: " + str((threshold1, threshold2, threshold3, threshold4))

        roi = get_roi()
        bkroi = get_bg_roi()
            
        tmp_file = self.pixel.image_root_folder + "tmp/spec_image_info.dat"        
        copyfile(filename, tmp_file)

        try:
            ret = img_get_int(tmp_file, threshold1, threshold2, threshold3, threshold4, \
                          self.pixel.image_header_length, self.pixel.PIX_XDIM, self.pixel.PIX_YDIM,self.pixel.PIX_COLOR_DEPTH, \
                          roi[0], roi[1], roi[2], roi[3], bkroi[0], bkroi[1], bkroi[2], bkroi[3])
        except:
            log("Error calculating intensity: " + str(filename) + " - " + str(sys.exc_info()[1]), False)
            ret = None                                                
        self.setCache(ret, None)
        return ret

    def get_image(self, filename = None):
        if filename is None:
            filename = self.pixel.get_image_filename()        
        filename = str(filename)
        
        if filename == self.last_filename:
            return self.last_image
        print "Reading image : " + filename 
        try:
            ret = img_read(filename, self.pixel.image_header_length, self.pixel.PIX_XDIM, self.pixel.PIX_YDIM,self.pixel.PIX_COLOR_DEPTH)          
        except:
            log("Error reading data file: " + str(filename) + " - " + str(sys.exc_info()[1]), False)
            return None
        ret = Convert.reshape(ret, self.pixel.PIX_YDIM, self.pixel.PIX_XDIM)              
        self.last_filename = filename
        self.last_image = ret
        return ret
    
    def read(self):
        return self.get_int()
        


class ReadableImage(ReadableMatrix):
    def read(self):
        ret = []
        for i in range (self.getHeight()):
            ret.append([random.random()] * self.getWidth())
        return to_array(ret, 'd')

    def getWidth(self):
        return 80

    def getHeight(self):
        return 40




add_device( Image("image", pixel), True)


def _update_detector_image():
    time.sleep(1.0)    #TODO: Must wait thje file to be ready instead
    image.matrix.update()

if "_pixelListener" in globals():  pixel.removeListener(_pixelListener)
class PixelListener (DeviceListener):
    def onValueChanged(self, device, value, former):
        fork(_update_detector_image)
_pixelListener = PixelListener()
pixel.addListener(_pixelListener)


add_device(RegisterMatrixSource("detector_image", image.matrix), True)      
detector_image.monitored = True
image.matrix.update()