"""Test JSON schema."""
import copy

from jsonschema import Draft3Validator
import pytest

from backend.validation import json_schema


@pytest.fixture
def example_schema():
    """Return a JSON Draft3 Schema to use in our validator tests.

    Returns:
        schema (dict): JSON Draft3 Validation Schema
    """
    schema = {
        'properties': {
            'account_type': {
                'required': True,
                'example': 'vendor',
                'description': 'vendor | subaccount',
                'type': 'string',
                'pattern': '(vendor)|(subaccount)'},
            'account_id': {
                'required': True,
                'type': 'string',
                'pattern': r'^\d+$',
                'description': 'vendor_id | subaccount_id'},
            'correlation_id': {
                'required': True,
                'type': 'string',
                'description': 'UUID'},
            'code': {
                'type': 'string',
                'required': True,
                'maxLength': 10}
        },
        'additionalProperties': False,
        'required': True,
        'type': 'object',
        '$schema': 'http://json-schema.org/draft-03/schema'
    }

    return schema


@pytest.fixture
def example_data_to_validate():
    """Return a dict that will successfully validate against our example.

    Returns:
        data (dict)
    """
    data = {
        'correlation_id': '123456678786485',
        'account_type': 'vendor',
        'account_id': '24',
        'code': 'ABC123'
    }

    return data


def test_json_schema_validate_success(
        monkeypatch, example_schema, example_data_to_validate):
    """Test general use case successful validation returns correct format."""
    response = json_schema.validate(
        data=example_data_to_validate,
        validator=Draft3Validator(example_schema))

    assert response.status == 200


def test_json_schema_validate_error(
        monkeypatch, example_schema, example_data_to_validate):
    """Test that the general use case 'fail' validation response is delivered.

    Our desired response.Response message format { field_name: error_message }.
    """
    mutated_data = copy.copy(example_data_to_validate)
    mutated_data.pop('correlation_id')
    mutated_data['account_type'] = 'banana'
    mutated_data['code'] = '12345678901'
    mutated_data['unknown_field'] = 'unknown_field_value'

    response = json_schema.validate(
        data=mutated_data,
        validator=Draft3Validator(example_schema))
    errors = response.errors.get('message')

    assert response.status == 400
    assert 'required' in errors.get('correlation_id')
    assert 'match' in errors.get('account_type')
    assert 'long' in errors.get('code')
    assert 'unknown_field' in errors.get('additionalProperties')