import os
import mathutils

DEBUG = os.environ.get('BLENDER_DEBUG', False) #activates debug mode
if DEBUG:
	import sys
	sys.path.append(os.environ['PYDEV_DEBUG_PATH'])
	import pydevd
	
from .model.migiusModel import MigiusDXFLibDrawing

SUPPORTED_TYPES = ('MESH')#,'CURVE','EMPTY','TEXT','CAMERA','LAMP')

def exportDXF(context, filePath, settings):
	"""
	Main entry point into export facility.
	"""
	print("----------\nExporting to {}".format(filePath))
	import time
	time1 = time.clock()

	if settings['verbose']:
		print("Generating Object list for export... (Root parents only)")

	scene = context.scene

	if settings['onlySelected'] is True:
		objects = (ob for ob in scene.objects if ob.is_visible(scene) and ob.select and ob.type in SUPPORTED_TYPES)
	else:
		objects = (ob for ob in scene.objects if ob.is_visible(scene) and ob.type in SUPPORTED_TYPES)
		
	if DEBUG: pydevd.settrace()
	mw = get_view_projection_matrix(context, settings)

	try:
		# add Entities --------------------
		#todo: fixme: seems to be the reason for missing BLOCK-export
		#if APPLY_MODIFIERS: tmp_me = Mesh.New('tmp')
		#else: tmp_me = None
	
		drawing = MigiusDXFLibDrawing()
		exported = 0
		for o in objects:
			if _exportItem(context, o, mw, drawing, settings):
				exported +=1
	
		if not drawing.isEmpty():
			# NOTE: Only orthographic projection used now.
	#		if PERSPECTIVE: # generate view border - passepartout
	#			from .primitive_exporters.viewborder_exporter import ViewBorderDXFExporter
	#			e = ViewBorderDXFExporter(settings)
	#			e.export(drawing, ob, mx, mw)
	
			drawing.convert(filePath)
			
		duration = time.clock() - time1
		print('%s objects exported in %.2f seconds. -----DONE-----' %\
			(exported, duration))
	except IOError:
		print('DXF Exporter: Write Error: ', filePath)
	except Exception as e:
		print('Nothing exported. Error: %s' % str(e))

	print("Finished")

#-------------------------------------------------
def getCommons(ob, settings):
	"""set up common attributes for output style:
	 color=None
	 extrusion=None
	 layer='0',
	 lineType=None
	 lineTypeScale=None
	 lineWeight=None
	 thickness=None
	 parent=None
	"""
	
	BYBLOCK=0 #DXF-attribute: assign property to BLOCK defaults
	BYLAYER=None #256 #DXF-attribute: assign property to LAYER defaults
	LAYERNAME_DEF='' #default layer name
	LAYERCOLOR_DEF=7 #default layer color index
	LAYERLTYPE_DEF=0 #'CONTINUOUS' - default layer lineType
	ENTITYLAYER_DEF=LAYERNAME_DEF #default entity color index
	ENTITYCOLOR_DEF=BYLAYER #default entity color index
	ENTITYLTYPE_DEF=BYLAYER #default entity lineType

	layers = ob.layers #gives a list e.g.[1,5,19]
	if layers: ob_layer_nr = layers[0]
	if DEBUG: print('ob_layer_nr=', ob_layer_nr) #--------------

	materials = ob.material_slots
	if materials:
		ob_material = materials[0]
		ob_mat_color = ob_material.material.diffuse_color
	else: ob_mat_color, ob_material = None, None
	if DEBUG: 
		print('ob_mat_color, ob_material=', ob_mat_color, ob_material) #--------------

	data_materials = ob.material_slots
	if data_materials:
		data_material = data_materials[0]
		data_mat_color = data_material.material.diffuse_color
	else: data_mat_color, data_material = None, None
	if DEBUG:
		print('data_mat_color, data_material=', data_mat_color, data_material) #--------------

	entitylayer = ENTITYLAYER_DEF
	c = settings['entitylayer_from']
	#["default_LAYER","obj.name","obj.layer","obj.material","obj.data.name","obj.data.material","..vertexgroup","..group","..map_table"]
	if c=="default_LAYER":
		entitylayer = LAYERNAME_DEF
	elif c=="obj.layer" and ob_layer_nr:
		entitylayer = 'LAYER'+ str(ob_layer_nr)
	elif c=="obj.material" and ob_material:
		entitylayer = ob_material.name
	elif c=="obj.name":
		entitylayer = ob.name
	elif c=="obj.data.material" and ob_material:
		entitylayer = data_material.name
	elif c=="obj.data.name":
		entitylayer = ob.data.name

	entitycolor = ENTITYCOLOR_DEF
	cfrom = settings['entitycolor_from']
	if cfrom=="default_COLOR":
		entitycolor = LAYERCOLOR_DEF
	elif cfrom=="BYLAYER":
		entitycolor = BYLAYER
	elif cfrom=="BYBLOCK":
		entitycolor = BYBLOCK
	elif cfrom=="obj.layer" and ob_layer_nr:
		entitycolor = ob_layer_nr
	elif cfrom=="obj.color" and ob.color:
		entitycolor = ob.color
	elif cfrom=="obj.material" and ob_mat_color:
		entitycolor = ob_mat_color
	elif cfrom=="obj.data.material" and data_mat_color:
		entitycolor = data_mat_color

	entityltype = ENTITYLTYPE_DEF
	etype = settings['entityltype_from']
	if etype=="default_LTYPE":
		entityltype = LAYERLTYPE_DEF
	elif etype=="BYLAYER":
		entityltype = BYLAYER
	elif etype=="BYBLOCK":
		entityltype = BYBLOCK
	elif etype:
		entityltype = etype

	return entitylayer, entitycolor, entityltype

def getCameraMatrix(cam):
	raise NotImplementedError()
#	camProps = cam.data
#		mc0 = act_camera.matrix.copy()
#				#print 'deb: camera.Matrix=\n', mc0 #------------------
#				camera = Camera.Get(act_camera.getData(name_only=True))
#				#print 'deb: camera=', dir(camera) #------------------
#				if camera.type=='persp': PERSPECTIVE = 1
#				elif camera.type=='ortho': PERSPECTIVE = 0
#				# mcp is matrix.camera.perspective
#				clip_box, mcp = getClipBox(camera)
##				if PERSPECTIVE:
##					# get border
##					# lens = camera.lens
##					min_X1, max_X1, min_Y1, max_Y1,\
##					min_X2, max_X2, min_Y2, max_Y2,\
##						min_Z, max_Z = clip_box
##					verts = []
##					verts.append([min_X1, min_Y1, min_Z])
##					verts.append([max_X1, min_Y1, min_Z])
##					verts.append([max_X1, max_Y1, min_Z])
##					verts.append([min_X1, max_Y1, min_Z])
##					border=verts
#				mw = mc0.copy().invert()
#			#ViewVector = mathutils.Vector(Window.GetViewVector())
#			#print 'deb: ViewVector=\n', ViewVector #------------------
#			#TODO: what is Window.GetViewOffset() for?
#			#print 'deb: Window.GetViewOffset():', Window.GetViewOffset() #---------
#			#Window.SetViewOffset([0,0,0])
#			mw0 = Window.GetViewMatrix()
#			#print 'deb: mwOrtho	=\n', mw0	 #---------
#			mwp = Window.GetPerspMatrix() #TODO: how to get it working?
#			#print 'deb: mwPersp	=\n', mwp	 #---------
#			mw = mw0.copy()

projectionMapping = {
  'TOP' : mathutils.Vector((0, 0, -1)),
  'BOTTOM' : mathutils.Vector((0, 0, 1)),
  'LEFT' : mathutils.Vector((0, 1, 0)),
  'RIGHT' : mathutils.Vector((0, -1, 0)),
  'FRONT' : mathutils.Vector((-1, 0, 0)),
  'REAR' : mathutils.Vector((1, 0, 0))
}

#-----------------------------------------------------
def get_view_projection_matrix(context, settings):
	"""
	Returns view projection matrix.
	Projection matrix is either identity if 3d export is selected or
	camera projection if a camera or view is selected.
	Currently only orthographic projection is used. (Subject to discussion).
	"""	
	cam = settings['projectionThrough']
	if cam == None:
		mw = mathutils.Matrix()
		mw.identity()
	elif cam in projectionMapping.keys():
		projection = mathutils.Matrix.OrthoProjection(projectionMapping[cam], 4)
		mw = projection
	else: # get camera with given name
		c = context.scene.objects[cam]
		mw = getCameraMatrix(c)
	return mw

def _exportItem(ctx, o, mw, drawing, settings):
	"""
	Export one item from export list.
	mw - modelview
	"""
	if settings['verbose']: print('Exporting %s' % o)
	#mx = ob.matrix.copy()
	#print 'deb: ob	=', ob	 #---------
	#print 'deb: ob.type	=', ob.type	 #---------
	#print 'deb: mx	=\n', mx	 #---------
	#print 'deb: mw0	=\n', mw0	 #---------
	#mx_n is trans-matrix for normal_vectors for front-side faces
	mx = o.matrix_world
	viewRotation = mw.to_euler().to_matrix()
	mx_n = o.rotation_euler.to_matrix() * viewRotation
	mx *= mw

	#mx_inv = mx.copy().invert()
	elayer, ecolor, eltype = getCommons(o, settings)
	if settings['verbose']:
		print('elayer=%s, ecolor=%s, eltype=%s' % (elayer, ecolor, eltype))
	#TODO: use o.boundBox for drawing extends ??

	if elayer != None and not drawing.containsLayer(elayer):
		if ecolor!=None: tempcolor = ecolor
		else: tempcolor = settings['layercolor_def']
		drawing.addLayer(elayer, tempcolor)

	if DEBUG: pydevd.settrace()
	if (o.type == 'MESH') and settings['mesh_as']:
		from .primitive_exporters.mesh_exporter import MeshDXFExporter
		e = MeshDXFExporter(settings)
	elif (o.type == 'CURVE') and settings['curve_as']:
		from .primitive_exporters.curve_exporter import CurveDXFExporter
		e = CurveDXFExporter(settings)
	elif (o.type == 'EMPTY') and settings['empty_as']:
		from .primitive_exporters.empty_exporter import EmptyDXFExporter
		e = EmptyDXFExporter(settings)
	elif (o.type == 'TEXT') and settings['text_as']:
		from .primitive_exporters.text_exporter import TextDXFExporter
		e = TextDXFExporter(settings)
	elif (o.type == 'CAMERA') and settings['camera_as']:
		from .primitive_exporters.camera_exporter import CameraDXFExporter
		e = CameraDXFExporter(settings)
	elif (o.type == 'LAMP') and settings['lamp_as']:
		from .primitive_exporters.lamp_exporter import LampDXFExporter
		e = LampDXFExporter(settings)

	return e.export(ctx, drawing, o, mx, mx_n, color=ecolor, layer=elayer, lineType=eltype)


