from string import ascii_lowercase

import pytest

from textual.binding import Bindings, Binding, BindingError, NoBinding

BINDING1 = Binding("a,b", action="action1", description="description1")
BINDING2 = Binding("c", action="action2", description="description2")


@pytest.fixture
def bindings():
    yield Bindings([BINDING1, BINDING2])


def test_bindings_get_key(bindings):
    assert bindings.get_key("b") == Binding("b", action="action1", description="description1")
    assert bindings.get_key("c") == BINDING2
    with pytest.raises(NoBinding):
        bindings.get_key("control+meta+alt+shift+super+hyper+t")

def test_bindings_merge_simple(bindings):
    left = Bindings([BINDING1])
    right = Bindings([BINDING2])
    assert Bindings.merge([left, right]).keys == bindings.keys

def test_bindings_merge_overlap():
    left = Bindings([BINDING1])
    another_binding = Binding("a", action="another_action", description="another_description")
    assert Bindings.merge([left, Bindings([another_binding])]).keys == {
        "a": another_binding,
        "b": Binding("b", action="action1", description="description1"),
    }

def test_bad_binding_tuple():
    with pytest.raises(BindingError):
        _ = Bindings((("a", "action"),))
    with pytest.raises(BindingError):
        _ = Bindings((("a", "action", "description","too much"),))

def test_binding_from_tuples():
    assert Bindings((( BINDING2.key, BINDING2.action, BINDING2.description),)).get_key("c") == BINDING2

def test_shown():
    bindings = Bindings([
        Binding(
            key, action=f"action_{key}", description=f"Emits {key}",show=bool(ord(key)%2)
        ) for key in ascii_lowercase
    ])
    assert len(bindings.shown_keys)==(len(ascii_lowercase)/2)