import pytest
from fasthtml.components import Div

from components.undo_redo.components.UndoRedo import UndoRedo, CommandHistory
from core.settings_management import SettingsManager, MemoryDbEngine
from helpers import matches, div_icon, Contains, DoesNotContain
from my_mocks import tabs_manager


class UndoableCommand(CommandHistory):
  def __init__(self, old_value=0, new_value=0):
    super().__init__("command", f"The new value is {new_value}")
    self.old_value = old_value
    self.new_value = new_value
  
  def undo(self):
    return Div(self.old_value, hx_swap_oob="true")
  
  def redo(self):
    return Div(self.new_value, hx_swap_oob="true")


@pytest.fixture
def undo_redo(session, tabs_manager):
  return UndoRedo(session,
                  UndoRedo.create_component_id(session),
                  settings_manager=SettingsManager(engine=MemoryDbEngine()),
                  tabs_manager=tabs_manager)


def test_i_can_render(undo_redo):
  actual = undo_redo.__ft__()
  expected = Div(
    Div(div_icon("undo", cls=Contains("mmt-btn-disabled")), data_tooltip="Nothing to undo"),
    Div(div_icon("redo", cls=Contains("mmt-btn-disabled")), data_tooltip="Nothing to redo"),
    id=undo_redo.get_id(),
  )
  
  assert matches(actual, expected)


def test_i_can_render_when_undoing_and_redoing(undo_redo):
  undo_redo.push(UndoableCommand())
  undo_redo.push(UndoableCommand())
  
  actual = undo_redo.__ft__()
  expected = Div(
    Div(div_icon("undo", cls=DoesNotContain("mmt-btn-disabled")), data_tooltip="Undo "),
    Div(div_icon("redo", cls=Contains("mmt-btn-disabled")), data_tooltip=""),
    id=undo_redo.get_id(),
  )
  assert matches(actual, expected)
  
  undo_redo.undo()  # The command is now undone. We can redo it and undo the first command.
  actual = undo_redo.__ft__()
  expected = Div(
    div_icon("undo", cls=DoesNotContain("mmt-btn-disabled")),
    div_icon("redo", cls=DoesNotContain("mmt-btn-disabled")),
    id=undo_redo.get_id(),
  )
  assert matches(actual, expected)
  
  undo_redo.undo()  # Undo again, I cannot undo anymore.
  actual = undo_redo.__ft__()
  expected = Div(
    div_icon("undo", cls=Contains("mmt-btn-disabled")),
    div_icon("redo", cls=DoesNotContain("mmt-btn-disabled")),
    id=undo_redo.get_id(),
  )
  assert matches(actual, expected)
  
  undo_redo.redo()  # Redo once.
  actual = undo_redo.__ft__()
  expected = Div(
    div_icon("undo", cls=DoesNotContain("mmt-btn-disabled")),
    div_icon("redo", cls=DoesNotContain("mmt-btn-disabled")),
    id=undo_redo.get_id(),
  )
  assert matches(actual, expected)
  
  undo_redo.redo()  # Redo a second time.
  actual = undo_redo.__ft__()
  expected = Div(
    div_icon("undo", cls=DoesNotContain("mmt-btn-disabled")),
    div_icon("redo", cls=Contains("mmt-btn-disabled")),
    id=undo_redo.get_id(),
  )
  assert matches(actual, expected)


def test_i_can_undo_and_redo(undo_redo):
  undo_redo.push(UndoableCommand(0, 1))
  undo_redo.push(UndoableCommand(1, 2))
  
  self, res = undo_redo.undo()
  expected = Div(1, hx_swap_oob="true")
  assert matches(res, expected)
  
  self, res = undo_redo.redo()
  expected = Div(2, hx_swap_oob="true")
  assert matches(res, expected)