from __future__ import annotations

import hashlib
import hmac

from reuse_surface.hub.webhooks import push_touches_registry_index, verify_signature

SECRET = "shh"


def _sign(body: bytes, secret: str = SECRET) -> str:
    return hmac.new(secret.encode("utf-8"), body, hashlib.sha256).hexdigest()


def test_verify_signature_valid():
    body = b'{"commits": []}'
    assert verify_signature(SECRET, body, _sign(body)) is True


def test_verify_signature_wrong_secret():
    body = b'{"commits": []}'
    assert verify_signature("different-secret", body, _sign(body)) is False


def test_verify_signature_tampered_body():
    body = b'{"commits": []}'
    signature = _sign(body)
    assert verify_signature(SECRET, b'{"commits": [1]}', signature) is False


def test_verify_signature_missing_signature():
    assert verify_signature(SECRET, b"{}", None) is False


def test_verify_signature_empty_secret_rejects():
    body = b"{}"
    # Even if a caller accidentally computed a signature with an empty
    # secret, verify_signature must not accept it -- an unconfigured
    # secret is not the same as "verification not needed".
    assert verify_signature("", body, _sign(body, secret="")) is False


def test_push_touches_registry_index_added():
    payload = {"commits": [{"added": ["registry/indexes/capabilities.yaml"], "modified": [], "removed": []}]}
    assert push_touches_registry_index(payload) is True


def test_push_touches_registry_index_modified():
    payload = {"commits": [{"added": [], "modified": ["registry/indexes/federated.yaml"], "removed": []}]}
    assert push_touches_registry_index(payload) is True


def test_push_touches_registry_index_removed():
    payload = {"commits": [{"added": [], "modified": [], "removed": ["registry/indexes/capabilities.yaml"]}]}
    assert push_touches_registry_index(payload) is True


def test_push_does_not_touch_registry_index():
    payload = {"commits": [{"added": ["README.md"], "modified": ["src/main.py"], "removed": []}]}
    assert push_touches_registry_index(payload) is False


def test_push_touches_registry_index_across_multiple_commits():
    payload = {
        "commits": [
            {"added": ["README.md"], "modified": [], "removed": []},
            {"added": [], "modified": ["registry/indexes/capabilities.yaml"], "removed": []},
        ]
    }
    assert push_touches_registry_index(payload) is True


def test_push_touches_registry_index_empty_commits():
    assert push_touches_registry_index({"commits": []}) is False
    assert push_touches_registry_index({}) is False


def test_push_touches_registry_index_ignores_similarly_named_paths():
    # a path that merely starts with "registry" but isn't under
    # registry/indexes/ must not match
    payload = {"commits": [{"added": ["registry/capabilities/capability.foo.md"], "modified": [], "removed": []}]}
    assert push_touches_registry_index(payload) is False