"""Slack-bot Lambda handler: malformed bodies return 400, not 500."""

import json
from types import SimpleNamespace

import pytest
from slack_bolt.request.internals import parse_body


def _context():
    return SimpleNamespace(
        function_name="afterhours-shift-manager",
        invoked_function_arn="arn:aws:lambda:us-east-1:1:function:x",
    )


def _event(body, content_type, user_agent="Python-urllib/3.12"):
    return {
        "version": "2.0",
        "routeKey": "POST /slack/events",
        "rawPath": "/slack/events",
        "headers": {
            "content-type": content_type,
            "user-agent": user_agent,
        },
        "requestContext": {"http": {"method": "POST", "path": "/slack/events"}},
        "body": body,
        "isBase64Encoded": False,
        "queryStringParameters": {},
    }


def test_parse_body_empty_payload_raises():
    with pytest.raises(json.JSONDecodeError):
        parse_body("payload=", "application/x-www-form-urlencoded")


def test_parse_body_non_json_payload_raises():
    with pytest.raises(json.JSONDecodeError):
        parse_body("payload=not-json", "application/x-www-form-urlencoded")


def test_empty_form_payload_returns_400(slackbot_handler):
    result = slackbot_handler.handler(
        _event("payload=", "application/x-www-form-urlencoded"), _context()
    )
    assert result["statusCode"] == 400
    assert result["body"] == "invalid request"


def test_non_json_form_payload_returns_400(slackbot_handler):
    result = slackbot_handler.handler(
        _event("payload=not-json", "application/x-www-form-urlencoded"),
        _context(),
    )
    assert result["statusCode"] == 400
    assert result["body"] == "invalid request"


def test_payload_substring_without_form_key_is_unsigned(slackbot_handler):
    result = slackbot_handler.handler(
        _event("hello payload world", "text/plain"), _context()
    )
    assert result["statusCode"] in (401, 403)


def test_json_events_body_is_unsigned_not_jsondecode(slackbot_handler):
    result = slackbot_handler.handler(
        _event(
            '{"type":"url_verification","challenge":"abc"}',
            "application/json",
            user_agent="Slackbot 1.0",
        ),
        _context(),
    )
    assert result["statusCode"] in (401, 403)