from dataclasses import dataclass

import pytest
from fasthtml.components import Label, Input
from myutils.observable import collect_return_values

from myfasthtml.core.bindings import BindingsManager, Binding


@dataclass
class Data:
  value: str = "Hello World"


@pytest.fixture(autouse=True)
def reset_binding_manager():
  BindingsManager.reset()


@pytest.fixture()
def data():
  return Data()


def test_i_can_register_a_binding(data):
  binding = Binding(data, "value")
  
  assert binding.id is not None
  assert binding.data is data
  assert binding.data_attr == 'value'


def test_i_can_register_a_binding_with_default_attr(data):
  binding = Binding(data)
  
  assert binding.id is not None
  assert binding.data is data
  assert binding.data_attr == 'value'


def test_i_can_retrieve_a_registered_binding(data):
  binding = Binding(data)
  assert BindingsManager.get_binding(binding.id) is binding


def test_i_can_reset_bindings(data):
  Binding(data)
  assert len(BindingsManager.bindings) != 0
  
  BindingsManager.reset()
  assert len(BindingsManager.bindings) == 0


def test_i_can_bind_an_element_to_a_binding(data):
  elt = Label("hello", id="label_id")
  Binding(data, ft=elt)
  
  data.value = "new value"
  
  assert elt.children[0] == "new value"
  assert elt.attrs["hx-swap-oob"] == "true"
  assert elt.attrs["id"] == "label_id"


def test_i_can_bind_an_element_attr_to_a_binding(data):
  elt = Input(value="somme value", id="input_id")
  
  Binding(data, ft=elt, ft_attr="value")
  
  data.value = "new value"
  
  assert elt.attrs["value"] == "new value"
  assert elt.attrs["hx-swap-oob"] == "true"
  assert elt.attrs["id"] == "input_id"


def test_bound_element_has_an_id():
  elt = Label("hello")
  assert elt.attrs.get("id", None) is None
  
  Binding(Data(), ft=elt)
  assert elt.attrs.get("id", None) is not None


def test_i_can_collect_updates_values(data):
  elt = Label("hello")
  Binding(data, ft=elt)
  
  data.value = "new value"
  collected = collect_return_values(data)
  assert collected == [elt]
  
  # a second time to ensure no side effect
  data.value = "another value"
  collected = collect_return_values(data)
  assert collected == [elt]