#!/usr/bin/env python3
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import unittest

import pexpect
import config
import thread_cert

LEADER = 1
ROUTER = 2


class TestCoapBlockTransfer(thread_cert.TestCase):
    """
    Test suite for CoAP Block-Wise Transfers (RFC7959).
    """

    SUPPORT_NCP = False

    TOPOLOGY = {
        LEADER: {
            'mode': 'rdn',
            'whitelist': [ROUTER]
        },
        ROUTER: {
            'mode': 'rdn',
            'whitelist': [LEADER]
        },
    }

    def test(self):
        leader = self.nodes[LEADER]
        router = self.nodes[ROUTER]

        leader.start()
        self.simulator.go(config.LEADER_STARTUP_DELAY)
        self.assertEqual(leader.get_state(), 'leader')

        router.start()
        self.simulator.go(config.ROUTER_STARTUP_DELAY)
        self.assertEqual(router.get_state(), 'router')

        leader_mleid = leader.get_ip6_address(config.ADDRESS_TYPE.ML_EID)
        router_mleid = router.get_ip6_address(config.ADDRESS_TYPE.ML_EID)

        leader.coap_set_resource_path_block('test', 3)

        leader.coap_start()
        router.coap_start()

        for method in ['GET', 'PUT', 'POST']:
            if method == 'GET':
                response = router.coap_get_block(leader_mleid, 'test', size=32)
            elif method == 'PUT':
                response = router.coap_put_block(leader_mleid, 'test', size=256, count=2)
            elif method == 'POST':
                response = router.coap_post_block(leader_mleid, 'test', size=1024, count=2)
            else:
                raise ValueError(method)

            self.assertEqual(response['source'], leader_mleid)

            request = leader.coap_wait_request()
            self.assertEqual(request['method'], method)
            self.assertEqual(request['source'], router_mleid)

            if method == 'GET':
                self.assertIsNotNone(response['payload'])
                self.assertIsNone(request['payload'])
            else:
                self.assertIsNone(response['payload'])
                self.assertIsNotNone(request['payload'])

            self.simulator.go(10)

        router.coap_stop()
        leader.coap_stop()


if __name__ == '__main__':
    unittest.main()