from werkzeug.wrappers import Response
import json

import frappe
from .twilio_handler import Twilio, IncomingCall

@frappe.whitelist()
def generate_access_token():
	"""Returns access token that is required to authenticate Twilio Client SDK.
	"""
	twilio = Twilio.connect()
	if not twilio:
		return {}

	from_number = frappe.db.get_value('Twilio Agents', frappe.session.user, 'twilio_number')
	if not from_number:
		return {
			"ok": False,
			"error": "caller_phone_identity_missing",
			"detail": "Phone number is not mapped to the caller"
		}

	token=twilio.generate_voice_access_token(identity=frappe.session.user)
	return {
		'token': frappe.safe_decode(token)
	}

@frappe.whitelist(allow_guest=True)
def voice(**kwargs):
	"""This is a webhook called by twilio to get instructions when the voice call request comes to twilio server.
	"""
	def _get_caller_number(caller):
		identity = caller.replace('client:', '').strip()
		user = Twilio.emailid_from_identity(identity)
		return frappe.db.get_value('Twilio Agents', user, 'twilio_number')

	args = frappe._dict(kwargs)
	twilio = Twilio.connect()
	if not twilio:
		return

	assert args.AccountSid == twilio.account_sid
	assert args.ApplicationSid == twilio.application_sid

	# Generate TwiML instructions to make a call
	from_number = _get_caller_number(args.Caller)
	resp = twilio.generate_twilio_dial_response(from_number, args.To)

	# call_details = TwilioCallDetails(args, call_from=from_number)
	# create_call_log(call_details)
	return Response(resp.to_xml(), mimetype='text/xml')

@frappe.whitelist(allow_guest=True)
def twilio_incoming_call_handler(**kwargs):
	args = frappe._dict(kwargs)
	# call_details = TwilioCallDetails(args)
	# create_call_log(call_details)

	resp = IncomingCall(args.From, args.To).process()
	return Response(resp.to_xml(), mimetype='text/xml')


@frappe.whitelist(allow_guest=True)
def get_call_info(**kwargs):
	"""This is a webhook called when the outgoing call status changes.
		E.g. 'initiated' 'ringing', 'in-progress', 'completed' etc.
	"""
	args = frappe._dict(kwargs)
	call_info = {
		'ParentCallSid': args.ParentCallSid,
		'CallSid': args.CallSid,
		'CallStatus': args.CallStatus,
		'CallDuration': args.CallDuration,
		'From': args.From,
		'To': args.To,
	}

	client = Twilio.get_twilio_client()
	client.calls(args.ParentCallSid).user_defined_messages.create(
		content=json.dumps(call_info)
	)