from functools import partial

from graphql.validation import NoUnusedFragmentsRule

from .harness import assert_validation_errors

assert_errors = partial(assert_validation_errors, NoUnusedFragmentsRule)

assert_valid = partial(assert_errors, errors=[])


def describe_validate_no_unused_fragments():
    def all_fragment_names_are_used():
        assert_valid(
            """
            {
              human(id: 4) {
                ...HumanFields1
                ... on Human {
                  ...HumanFields2
                }
              }
            }
            fragment HumanFields1 on Human {
              name
              ...HumanFields3
            }
            fragment HumanFields2 on Human {
              name
            }
            fragment HumanFields3 on Human {
              name
            }
            """
        )

    def all_fragment_names_are_used_by_multiple_operations():
        assert_valid(
            """
            query Foo {
              human(id: 4) {
                ...HumanFields1
              }
            }
            query Bar {
              human(id: 4) {
                ...HumanFields2
              }
            }
            fragment HumanFields1 on Human {
              name
              ...HumanFields3
            }
            fragment HumanFields2 on Human {
              name
            }
            fragment HumanFields3 on Human {
              name
            }
            """
        )

    def contains_unknown_fragments():
        assert_errors(
            """
            query Foo {
              human(id: 4) {
                ...HumanFields1
              }
            }
            query Bar {
              human(id: 4) {
                ...HumanFields2
              }
            }
            fragment HumanFields1 on Human {
              name
              ...HumanFields3
            }
            fragment HumanFields2 on Human {
              name
            }
            fragment HumanFields3 on Human {
              name
            }
            fragment Unused1 on Human {
              name
            }
            fragment Unused2 on Human {
              name
            }
            """,
            [
                {
                    "message": "Fragment 'Unused1' is never used.",
                    "locations": [(22, 13)],
                },
                {
                    "message": "Fragment 'Unused2' is never used.",
                    "locations": [(25, 13)],
                },
            ],
        )

    def contains_unknown_fragments_with_ref_cycle():
        assert_errors(
            """
            query Foo {
              human(id: 4) {
                ...HumanFields1
              }
            }
            query Bar {
              human(id: 4) {
                ...HumanFields2
              }
            }
            fragment HumanFields1 on Human {
              name
              ...HumanFields3
            }
            fragment HumanFields2 on Human {
              name
            }
            fragment HumanFields3 on Human {
              name
            }
            fragment Unused1 on Human {
              name
              ...Unused2
            }
            fragment Unused2 on Human {
              name
              ...Unused1
            }
            """,
            [
                {
                    "message": "Fragment 'Unused1' is never used.",
                    "locations": [(22, 13)],
                },
                {
                    "message": "Fragment 'Unused2' is never used.",
                    "locations": [(26, 13)],
                },
            ],
        )

    def contains_unknown_and_undefined_fragments():
        assert_errors(
            """
            query Foo {
              human(id: 4) {
                ...bar
              }
            }
            fragment foo on Human {
              name
            }
            """,
            [{"message": "Fragment 'foo' is never used.", "locations": [(7, 13)]}],
        )