from numpy import int16,std
from Kalman import KalmanFilter

def connect(route):
	return MPU6050(route)

class MPU6050():
	'''
	Mandatory members:
	GetRaw : Function called by Graphical apps. Must return values stored in a list
	NUMPLOTS : length of list returned by GetRaw. Even single datapoints need to be stored in a list before returning
	PLOTNAMES : a list of strings describing each element in the list returned by GetRaw. len(PLOTNAMES) = NUMPLOTS
	name : the name of the sensor shown to the user
	params:
		A dictionary of function calls(single arguments only) paired with list of valid argument values. (Primitive. I know.)
		These calls can be used for one time configuration settings

	'''
	GYRO_CONFIG = 0x1B
	ACCEL_CONFIG = 0x1C
	GYRO_SCALING= [131,65.5,32.8,16.4]
	ACCEL_SCALING=[16384,8192,4096,2048]
	AR=3
	GR=3
	NUMPLOTS=7
	PLOTNAMES = ['Ax','Ay','Az','Temp','Gx','Gy','Gz']

	def __init__(self,I2C):
		self.I2C=I2C
		self.ADDRESS = 0x68
		self.name = 'Accel/gyro'
		self.params={'powerUp':['Go'],'setGyroRange':[250,500,1000,2000],'setAccelRange':[2,4,8,16],'KalmanFilter':[.01,.1,1,10,100,1000,10000,'OFF']}
		self.setGyroRange(2000)
		self.setAccelRange(16)
		'''
		try:
			self.I2C.configI2C(400e3)
		except:
			pass
		'''
		self.powerUp(True)
		self.K=None



	def KalmanFilter(self,opt):
		if opt=='OFF':
			self.K=None
			return
		noise=[[]]*self.NUMPLOTS
		for a in range(500):
			vals=self.getRaw()
			for b in range(self.NUMPLOTS):noise[b].append(vals[b])

		self.K=[None]*7
		for a in range(self.NUMPLOTS):
			sd = std(noise[a])
			self.K[a] = KalmanFilter(1./opt, sd**2)

	def getVals(self,addr,bytes):
		vals = self.I2C.readBulk(self.ADDRESS,addr,bytes) 
		return vals

	def powerUp(self,x):
		self.I2C.writeBulk(self.ADDRESS,[0x6B,0])

	def setGyroRange(self,rs):
		self.GR=self.params['setGyroRange'].index(rs)
		self.I2C.writeBulk(self.ADDRESS,[self.GYRO_CONFIG,self.GR<<3])
		
	def setAccelRange(self,rs):
		self.AR=self.params['setAccelRange'].index(rs)
		self.I2C.writeBulk(self.ADDRESS,[self.ACCEL_CONFIG,self.AR<<3])

	def getRaw(self):
		'''
		This method must be defined if you want GUIs to use this class to generate 
		plots on the fly.
		It must return a set of different values read from the sensor. such as X,Y,Z acceleration.
		The length of this list must not change, and must be defined in the variable NUMPLOTS.
		
		GUIs will generate as many plots, and the data returned from this method will be appended appropriately
		'''
		vals=self.getVals(0x3B,14)
		if vals:
			if len(vals)==14:
				raw=[0]*7
				for a in range(3):raw[a] = 1.*int16(vals[a*2]<<8|vals[a*2+1])/self.ACCEL_SCALING[self.AR]
				for a in range(4,7):raw[a] = 1.*int16(vals[a*2]<<8|vals[a*2+1])/self.GYRO_SCALING[self.GR]
				raw[3] = int16(vals[6]<<8|vals[7])/340. + 36.53
				if not self.K:
					return raw
				else:
					for b in range(self.NUMPLOTS):
						self.K[b].input_latest_noisy_measurement(raw[b])
						raw[b]=self.K[b].get_latest_estimated_measurement()
					return raw

			else:
				return False
		else:
			return False

	def getAccel(self):
		vals=self.getVals(0x3B,6)
		ax=int16(vals[0]<<8|vals[1])
		ay=int16(vals[2]<<8|vals[3])
		az=int16(vals[4]<<8|vals[5])
		return [ax/65535.,ay/65535.,az/65535.]

	def getTemp(self):
		vals=self.getVals(0x41,6)
		t=int16(vals[0]<<8|vals[1])
		return t/65535.

	def getGyro(self):
		vals=self.getVals(0x43,6)
		ax=int16(vals[0]<<8|vals[1])
		ay=int16(vals[2]<<8|vals[3])
		az=int16(vals[4]<<8|vals[5])
		return [ax/65535.,ay/65535.,az/65535.]
		
