# -*- coding: utf-8 -*-
import vimbastructure as structs
from vimbadll import VimbaDLL
from vimbaexception import VimbaException
from vimbasystem import VimbaSystem
from vimbacamera import VimbaCamera
from vimbainterface import VimbaInterface
from ctypes import *

class Vimba(object):
	"""
	An Allied Vision Technology Vimba API.
	This API provides access to AVT cameras.
	"""
	
	# todo - assign camera info and feature info as own object proeprties
	
	def __init__(self):

		# create own system singleton object
		self._system = VimbaSystem()
			
		# lists of VimbaCameraInfo and VimbaInterfaceInfo objects
		# can't be called before startup() so populate later
		self._cameraInfos = None
		self._interfaceInfos = None	
		
		# dict of {camera ID : VimbaCamera object} as we don't want to forget them
		self._cameras = {}
		
		# dict of {interface ID : VimbaInterface object} as we don't want to forget them
		self._interfaces = {}
		
	def _getInterfaceInfos(self):
		"""
		Gets interface info of all available interfaces.
		
		:returns: list -- interface info for available interfaces.
		"""
		if self._interfaceInfos is None:
			# args
			dummyInterfaceInfo = structs.VimbaInterfaceInfo()	 
			numFound = c_uint32(-1)
			
			# call once just to get the number of interfaces
			# Vimba DLL will return an error code
			errorCode = VimbaDLL.interfacesList(byref(dummyInterfaceInfo),
												0,
												byref(numFound),
												sizeof(dummyInterfaceInfo))
			if errorCode != 0:
				print errorCode
				raise VimbaException(errorCode)
			
			numInterfaces = numFound.value
			
			# args
			interfaceInfoArray = (structs.VimbaInterfaceInfo * numInterfaces)()
		
			# call again to get the features
			# Vimba DLL will return an error code
			errorCode = VimbaDLL.interfacesList(interfaceInfoArray,
												numInterfaces,
												byref(numFound),
												sizeof(dummyInterfaceInfo))
			if errorCode != 0:
				raise VimbaException(errorCode)
			self._interfaceInfos = list(interfaceInfo for interfaceInfo in interfaceInfoArray)
		return self._interfaceInfos
	
	def _getCameraInfos(self):
		"""
		Gets camera info of all attached cameras.
		
		:returns: list -- camera info for available cameras.
		"""
		if self._cameraInfos is None:
			# args
			dummyCameraInfo = structs.VimbaCameraInfo()	 
			numFound = c_uint32(-1)
			
			# call once just to get the number of cameras
			# Vimba DLL will return an error code
			errorCode = VimbaDLL.camerasList(byref(dummyCameraInfo),
											 0,
											 byref(numFound),
											 sizeof(dummyCameraInfo))
			if errorCode != 0:
				print errorCode
				raise VimbaException(errorCode)
			
			numCameras = numFound.value
			
			# args
			cameraInfoArray = (structs.VimbaCameraInfo * numCameras)()
		
			# call again to get the features
			# Vimba DLL will return an error code
			errorCode = VimbaDLL.camerasList(cameraInfoArray,
											 numCameras,
											 byref(numFound),
											 sizeof(dummyCameraInfo))
			if errorCode != 0:
				raise VimbaException(errorCode)
			self._cameraInfos = list(camInfo for camInfo in cameraInfoArray)
		return self._cameraInfos
	
	def getSystem(self):
		"""
		Gets system singleton object.
				
		:returns: VimbaSystem object -- the system singleton object.
		"""
		return self._system

	def getInterfaceIds(self):
		"""
		Gets IDs of all available interfaces.
		
		:returns: list -- interface IDs for available interfaces.
		"""
		return list(interfaceInfo.interfaceIdString for interfaceInfo in self._getInterfaceInfos())

	def getCameraIds(self):
		"""
		Gets IDs of all available cameras.
		
		:returns: list -- camera IDs for available cameras.
		"""
		return list(camInfo.cameraIdString for camInfo in self._getCameraInfos())

	def getInterfaceInfo(self, interfaceId):
		"""
		Gets interface info object of specified interface.
		
		:param interfaceId: the ID of the interface object to get.
		
		:returns: VimbaInterfaceInfo object -- the interface info object specified.
		"""
		# don't do this live as we already have this info
		# return info object if it exists
		for interfaceInfo in self._getInterfaceInfos():
			if interfaceInfo.interfaceIdString == interfaceId:
				return interfaceInfo
		# otherwise raise error
		raise VimbaException(-54)

	def getCameraInfo(self, cameraId):
		"""
		Gets camera info object of specified camera.
		
		:param cameraId: the ID of the camera object to get.
		
		:returns: VimbaCameraInfo object -- the camera info object specified.
		"""
		# don't do this live as we already have this info
		# return info object if it exists
		for camInfo in self._getCameraInfos():
			if camInfo.cameraIdString == cameraId:
				return camInfo
		# otherwise raise error
		raise VimbaException(-50)
	
	def getInterface(self, interfaceId):
		"""
		Gets interface object based on interface ID string. Will not recreate
		interface object if it already exists.
		
		:param interfaceId: the ID of the interface.
		
		:returns: VimbaInterface object -- the interface object specified.		
		"""
		# check ID is valid
		if interfaceId in self.getInterfaceIds():
			# create it if it doesn't exist
			if interfaceId not in self._interfaces:
				self._interfaces[interfaceId] = VimbaInterface(interfaceId)
			return self._interfaces[interfaceId]
		raise VimbaException(-54)

	def getCamera(self, cameraId):
		"""
		Gets camera object based on camera ID string. Will not recreate
		camera object if it already exists.
		
		:param cameraId: the ID of the camera.
		
		:returns: VimbaCamera object -- the camera object specified.		
		"""
		# check ID is valid
		if cameraId in self.getCameraIds():
			# create it if it doesn't exist
			if cameraId not in self._cameras:
				self._cameras[cameraId] = VimbaCamera(cameraId)
			return self._cameras[cameraId]
		raise VimbaException(-50)

	def getVersion(self):
		"""
		Retrieve the version number of VimbaC.
		
		:returns: string - Vimba API version info.
		"""
		# args
		versionInfo = structs.VimbaVersion()
		
		# Vimba DLL will return an error code
		errorCode = VimbaDLL.versionQuery(versionInfo,
										  sizeof(versionInfo))
		if errorCode != 0:
			raise VimbaException(errorCode)
		
		versionStr = '.'.join([str(versionInfo.major),
							   str(versionInfo.minor),
							   str(versionInfo.patch)])
		return versionStr
		
	def startup(self):
		"""
		Initialize the VimbaC API.
		"""
		# Vimba DLL will return an error code
		errorCode = VimbaDLL.startup()
		if errorCode != 0:
			raise VimbaException(errorCode)
		
	def shutdown(self):
		"""
		Perform a shutdown on the API.
		"""
		VimbaDLL.shutdown()