# Copyright (c) 2010-2019 openpyxl

from copy import copy

import pytest


@pytest.fixture
def dummy_object():
    class Dummy:

        def __init__(self, a, b, c):
            self.a = a
            self.b = b
            self.c = c

        def __repr__(self):
            return "dummy object"

        def __add__(self, other):
            if self.a is None:
                self.a = other.a
            return self

    return Dummy(a=1, b=2, c=3)


@pytest.fixture
def proxy(dummy_object):
    from .. proxy import StyleProxy
    return StyleProxy(dummy_object)


def test_ctor(proxy):
    assert proxy.a == 1
    assert proxy.b == 2
    assert proxy.c == 3


def test_non_writable(proxy):
    with pytest.raises(AttributeError):
        proxy.a = 5


def test_repr(proxy):
    assert repr(proxy) == "dummy object"


def test_copy(proxy):
    cp = copy(proxy)
    assert cp is not proxy
    assert cp.a == 1
    assert cp.b == 2
    assert cp.c == 3


def test_add(dummy_object):
    from ..proxy import StyleProxy

    o1 = dummy_object
    o2 = copy(dummy_object)
    o1.a = None
    o1 = StyleProxy(dummy_object)

    combined = o1 + o2
    assert combined.a == 1
