"""
Tests for in-toto attestation Statement protos.
"""

import unittest

import google.protobuf.json_format as pb_json

import in_toto_attestation.v1.resource_descriptor_pb2 as rdpb
import in_toto_attestation.v1.statement_pb2 as stpb
from in_toto_attestation.v1.statement import Statement


def create_test_statement():
    sub = rdpb.ResourceDescriptor()
    sub.name = "theSub"
    sub.digest["alg1"] = "abc123"

    stmt = Statement([sub], "thePredicate", {"keyObj": {"subKey": "subVal"}})
    return stmt


class TestStatement(unittest.TestCase):
    def test_create_statement(self):
        test_st = create_test_statement()
        test_st.validate()

    def test_json_parse_statement(self):
        full_st = '{"_type":"https://in-toto.io/Statement/v1","subject":[{"name":"theSub","digest":{"alg1":"abc123"}}],"predicateType":"thePredicate","predicate":{"keyObj":{"subKey":"subVal"}}}'
        got_pb = pb_json.Parse(full_st, stpb.Statement())
        got = got_pb.SerializeToString(deterministic=True)

        test_st = create_test_statement()
        want = test_st.pb.SerializeToString(deterministic=True)

        self.assertEqual(got, want, "Protos do not match")

    def test_bad_statement_type(self):
        bad_st = '{"_type":"https://in-toto.io/Statement/v0","subject":[{"name":"theSub","digest":{"alg1":"abc123"}}],"predicateType":"thePredicate","predicate":{"keyObj":{"subKey":"subVal"}}}'

        got_pb = pb_json.Parse(bad_st, stpb.Statement())
        got = Statement.copy_from_pb(got_pb)

        with self.assertRaises(
            ValueError, msg="Error: created malformed Statement (bad type)"
        ):
            got.validate()

    def test_bad_statement_empty_subject(self):
        bad_st = '{"_type":"https://in-toto.io/Statement/v1","subject":[],"predicateType":"thePredicate","predicate":{"keyObj":{"subKey":"subVal"}}}'

        got_pb = pb_json.Parse(bad_st, stpb.Statement())
        got = Statement.copy_from_pb(got_pb)

        with self.assertRaises(
            ValueError, msg="Error: created malformed Statement (empty subject)"
        ):
            got.validate()

    def test_bad_statement_bad_subject(self):
        bad_st = '{"_type":"https://in-toto.io/Statement/v1","subject":[{"digest":{}}],"predicateType":"thePredicate","predicate":{"keyObj":{"subKey":"subVal"}}}'

        got_pb = pb_json.Parse(bad_st, stpb.Statement())
        got = Statement.copy_from_pb(got_pb)

        with self.assertRaises(
            ValueError, msg="Error: created malformed Statement (bad subject)"
        ):
            got.validate()

    def test_bad_predicate_type(self):
        bad_st = '{"_type":"https://in-toto.io/Statement/v1","subject":[{"name":"theSub","digest":{"alg1":"abc123"}}],"predicateType":"","predicate":{"keyObj":{"subKey":"subVal"}}}'

        got_pb = pb_json.Parse(bad_st, stpb.Statement())
        got = Statement.copy_from_pb(got_pb)

        with self.assertRaises(
            ValueError, msg="Error: created malformed Statement (bad predicate type)"
        ):
            got.validate()

    def test_bad_predicate(self):
        bad_st = '{"_type":"https://in-toto.io/Statement/v1","subject":[{"name":"theSub","digest":{"alg1":"abc123"}}],"predicateType":"thePredicate"}'

        got_pb = pb_json.Parse(bad_st, stpb.Statement())
        got = Statement.copy_from_pb(got_pb)

        with self.assertRaises(
            ValueError, msg="Error: created malformed Statement (bad predicate)"
        ):
            got.validate()


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