import pytest

from bonobo import Bag, JsonReader, JsonWriter, open_fs, settings
from bonobo.constants import BEGIN, END
from bonobo.execution.node import NodeExecutionContext
from bonobo.util.testing import CapturingNodeExecutionContext


def test_write_json_to_file(tmpdir):
    fs, filename = open_fs(tmpdir), 'output.json'

    writer = JsonWriter(filename, ioformat=settings.IOFORMAT_ARG0)
    context = NodeExecutionContext(writer, services={'fs': fs})

    context.start()
    context.write(BEGIN, Bag({'foo': 'bar'}), END)
    context.step()
    context.stop()

    with fs.open(filename) as fp:
        assert fp.read() == '[{"foo": "bar"}]'

    with pytest.raises(AttributeError):
        getattr(context, 'file')

    with pytest.raises(AttributeError):
        getattr(context, 'first')


def test_read_json_from_file(tmpdir):
    fs, filename = open_fs(tmpdir), 'input.json'
    with fs.open(filename, 'w') as fp:
        fp.write('[{"x": "foo"},{"x": "bar"}]')
    reader = JsonReader(filename, ioformat=settings.IOFORMAT_ARG0)

    context = CapturingNodeExecutionContext(reader, services={'fs': fs})

    context.start()
    context.write(BEGIN, Bag(), END)
    context.step()
    context.stop()

    assert len(context.send.mock_calls) == 2

    args0, kwargs0 = context.send.call_args_list[0]
    assert len(args0) == 1 and not len(kwargs0)
    args1, kwargs1 = context.send.call_args_list[1]
    assert len(args1) == 1 and not len(kwargs1)

    assert args0[0].args[0] == {'x': 'foo'}
    assert args1[0].args[0] == {'x': 'bar'}