from falcon import API as FalconAPI
from falcon import HTTP_200
from json import dumps as encodeJSON, loads as decodeJSON
from sys import argv

class IndexPage:
	apiDictList = None
	def __init__(self, apiDictList):
		self.apiDictList = apiDictList
	def on_get(self, req, resp):
		resp.body = encodeJSON({"classes":self.apiDictList})

class FalconObject(object):
	def getJSON(self, req):
		rawInput = str(req.stream.read())
		if len(rawInput) == 0:
			return {}
		else:
			return decodeJSON(rawInput) 

# Beginning of your FalconObject-inherited class(es)
class SquareArea(FalconObject):
	def on_get(self, req, resp):
		resp.body, resp.status = encodeJSON({"x":None}), HTTP_200
	def on_post(self, req, resp):
		# Obtain a copy of the data input in the form of a JSON object
		json = self.getJSON(req)

		# Compute the results
		x = json.get("x", 0)
		json["area"] = x * x

		# Embed a stringified resulting JSON object
		resp.body, resp.status = encodeJSON(json), HTTP_200

class SquarePerimeter(FalconObject):
	def on_get(self, req, resp):
		resp.body, resp.status = encodeJSON({"x":None}), HTTP_200
	def on_post(self, req, resp):
		json = self.getJSON(req)
		json["perimeter"] = abs(json.get("x", 0)) * 2
		resp.body, resp.status = encodeJSON(json), HTTP_200
# End of your FalconObject-inherited class(es)


"""
	D O   N O T   M E S S   W I T H   T H E   F O L L O W I N G
	                 B L O C K   O F   C O D E
"""
app = FalconAPI()
apiClassList = []
for _class_ in FalconObject.__subclasses__():
	classInstance = _class_()
	className = type(classInstance).__name__
	app.add_route("/%s/" % className, classInstance)
	apiClassList.append(className)
	print("{0} Providing {1} at /{1}/".format(argv[0], className))
app.add_route("/", IndexPage(apiClassList))