import logging

import pytest

from gaphor import UML
from gaphor.application import Application
from gaphor.core import Transaction, event_handler
from gaphor.core.modeling import AssociationUpdated, Diagram
from gaphor.diagram.copypaste import copy_full, paste_full
from gaphor.diagram.tests.fixtures import connect
from gaphor.UML.classes import (
    AssociationItem,
    ClassItem,
    ContainmentItem,
    GeneralizationItem,
)
from gaphor.UML.interactions import MessageItem
from gaphor.UML.interactions.interactionstoolbox import reflexive_message_config


@pytest.fixture
def application():
    app = Application()
    yield app
    app.shutdown()


@pytest.fixture
def session(application):
    return application.new_session()


@pytest.fixture
def event_manager(session):
    return session.get_service("event_manager")


@pytest.fixture
def element_factory(session):
    return session.get_service("element_factory")


@pytest.fixture
def undo_manager(session):
    return session.get_service("undo_manager")


def test_class_association_undo_redo(event_manager, element_factory, undo_manager):
    diagram, ci1, ci2, a = set_up_class_and_association(event_manager, element_factory)

    def get_connected(handle):
        """Get item connected to line via handle."""
        if cinfo := diagram.connections.get_connection(handle):
            return cinfo.connected
        return None

    undo_manager.clear_undo_stack()
    assert not undo_manager.can_undo()

    with Transaction(event_manager):
        ci2.unlink()

    assert undo_manager.can_undo()

    for _i in range(3):
        assert 9 == len(diagram.connections.solver.constraints)

        undo_manager.undo_transaction()

        assert 18 == len(diagram.connections.solver.constraints)

        a = next(element_factory.select(AssociationItem))
        assert ci1 == get_connected(a.head)
        assert ci2.id == get_connected(a.tail).id

        undo_manager.redo_transaction()


def set_up_class_and_association(event_manager, element_factory):
    with Transaction(event_manager):
        diagram = element_factory.create(Diagram)

    assert 0 == len(diagram.connections.solver.constraints)

    with Transaction(event_manager):
        ci1 = diagram.create(ClassItem, subject=element_factory.create(UML.Class))
    assert 8 == len(diagram.connections.solver.constraints)

    with Transaction(event_manager):
        ci2 = diagram.create(ClassItem, subject=element_factory.create(UML.Class))
    assert 16 == len(diagram.connections.solver.constraints)

    with Transaction(event_manager):
        a = diagram.create(AssociationItem)

        connect(a, a.head, ci1)
        connect(a, a.tail, ci2)

    # Diagram, Association, 2x Class, Property, LiteralSpecification
    assert 12 == len(element_factory.lselect())
    assert 18 == len(diagram.connections.solver.constraints)

    return diagram, ci1, ci2, a


def test_diagram_item_can_undo_and_redo(
    event_manager, element_factory, undo_manager, caplog
):
    caplog.set_level(logging.INFO)
    with Transaction(event_manager):
        diagram = element_factory.create(Diagram)

    with Transaction(event_manager):
        cls = diagram.create(ClassItem, subject=element_factory.create(UML.Class))
        cls.subject.name = "name"
        cls.matrix.translate(10, 10)

    undo_manager.undo_transaction()
    undo_manager.redo_transaction()
    new_cls = diagram.ownedPresentation[0]
    assert new_cls.matrix.tuple() == (1, 0, 0, 1, 10, 10)
    assert new_cls.subject, element_factory.select()
    assert new_cls.subject.name == "name"
    assert not caplog.records


def test_diagram_item_should_not_end_up_in_element_factory(
    event_manager, element_factory, undo_manager
):
    with Transaction(event_manager):
        diagram = element_factory.create(Diagram)

    with Transaction(event_manager):
        cls = diagram.create(ClassItem, subject=element_factory.create(UML.Class))

    undo_manager.undo_transaction()
    undo_manager.redo_transaction()

    assert cls not in element_factory.lselect(), element_factory.lselect()


def test_delete_and_undo_diagram_item(event_manager, element_factory, undo_manager):
    with Transaction(event_manager):
        diagram = element_factory.create(Diagram)

    with Transaction(event_manager):
        subject = element_factory.create(UML.Class)
        subject.name = "Name"
        cls = diagram.create(ClassItem, subject=subject)

    with Transaction(event_manager):
        cls.unlink()

    undo_manager.undo_transaction()

    new_cls = diagram.ownedPresentation[0]
    new_elem = element_factory.lookup(subject.id)

    assert new_cls in new_elem.presentation
    assert new_cls.subject
    assert new_elem.name == "Name"


def test_delete_and_undo_model_element(event_manager, element_factory, undo_manager):
    with Transaction(event_manager):
        diagram = element_factory.create(Diagram)

    with Transaction(event_manager):
        subject = element_factory.create(UML.Class)
        subject.name = "Name"
        diagram.create(ClassItem, subject=subject)

    with Transaction(event_manager):
        subject.unlink()

    undo_manager.undo_transaction()

    new_cls = diagram.ownedPresentation[0]
    new_elem = element_factory.lookup(subject.id)

    assert new_cls in new_elem.presentation
    assert new_cls.subject
    assert new_elem.name == "Name"


def test_deleted_diagram_item_should_not_end_up_in_element_factory(
    event_manager, element_factory, undo_manager
):
    with Transaction(event_manager):
        diagram = element_factory.create(Diagram)
        cls = diagram.create(ClassItem, subject=element_factory.create(UML.Class))

    with Transaction(event_manager):
        cls.unlink()

    undo_manager.undo_transaction()

    assert cls not in element_factory.lselect(), element_factory.lselect()

    undo_manager.redo_transaction()

    assert cls not in element_factory.lselect(), element_factory.lselect()


def test_undo_should_not_cause_warnings(
    event_manager, element_factory, undo_manager, caplog
):
    caplog.set_level(logging.INFO)
    with Transaction(event_manager):
        diagram = element_factory.create(Diagram)

    with Transaction(event_manager):
        diagram.create(ClassItem, subject=element_factory.create(UML.Class))

    assert not caplog.records

    undo_manager.undo_transaction()

    assert not diagram.ownedPresentation
    assert not caplog.records


def test_can_undo_connected_generalization(
    event_manager, element_factory, undo_manager, caplog
):
    caplog.set_level(logging.INFO)
    with Transaction(event_manager):
        diagram: Diagram = element_factory.create(Diagram)
        general = diagram.create(ClassItem, subject=element_factory.create(UML.Class))
        specific = diagram.create(ClassItem, subject=element_factory.create(UML.Class))

    with Transaction(event_manager):
        generalization = diagram.create(GeneralizationItem)
        connect(generalization, generalization.head, general)
        connect(generalization, generalization.tail, specific)

    assert not caplog.records

    undo_manager.undo_transaction()

    assert not list(diagram.select(GeneralizationItem))
    assert not caplog.records

    undo_manager.redo_transaction()
    new_generalization_item = next(diagram.select(GeneralizationItem))
    new_generalization = next(element_factory.select(UML.Generalization))

    assert len(list(diagram.select(GeneralizationItem))) == 1
    assert len(element_factory.lselect(UML.Generalization)) == 1
    assert new_generalization_item.subject is new_generalization
    assert not caplog.records


def test_can_undo_connected_association(
    event_manager, element_factory, undo_manager, caplog
):
    caplog.set_level(logging.INFO)
    with Transaction(event_manager):
        diagram: Diagram = element_factory.create(Diagram)
        parent = diagram.create(ClassItem, subject=element_factory.create(UML.Class))
        child = diagram.create(ClassItem, subject=element_factory.create(UML.Class))

    with Transaction(event_manager):
        association = diagram.create(AssociationItem)
        connect(association, association.head, parent)
        connect(association, association.tail, child)

    assert not caplog.records

    undo_manager.undo_transaction()

    assert not list(diagram.select(AssociationItem))
    assert not caplog.records

    undo_manager.redo_transaction()
    new_association_item = next(diagram.select(AssociationItem))
    new_association = next(element_factory.select(UML.Association))

    assert len(list(diagram.select(AssociationItem))) == 1
    assert len(element_factory.lselect(UML.Association)) == 1

    assert len(new_association.memberEnd) == 2
    assert new_association_item.subject is new_association
    assert new_association_item.head_subject
    assert new_association_item.tail_subject
    assert not caplog.records


def test_can_undo_diagram_with_content(event_manager, element_factory, undo_manager):
    with Transaction(event_manager):
        diagram: Diagram = element_factory.create(Diagram)
        diagram.create(ClassItem, subject=element_factory.create(UML.Class))

    with Transaction(event_manager):
        diagram.unlink()

    undo_manager.undo_transaction()

    new_diagram = element_factory.lookup(diagram.id)

    assert new_diagram
    assert new_diagram.ownedPresentation


def test_reflexive_message_undo(event_manager, element_factory, undo_manager):
    with Transaction(event_manager):
        diagram: Diagram = element_factory.create(Diagram)

    with Transaction(event_manager):
        message = diagram.create(MessageItem)
        reflexive_message_config(message)

    undo_manager.undo_transaction()


def test_delete_item_with_subject_owning_diagram(
    event_manager, element_factory, undo_manager
):
    with Transaction(event_manager):
        diagram: Diagram = element_factory.create(Diagram)
        klass = element_factory.create(UML.Class)
        class_item = diagram.create(ClassItem, subject=klass)
        diagram.element = klass

    with Transaction(event_manager):
        class_item.unlink()

    undo_manager.undo_transaction()


def test_reconnect_on_same_element(event_manager, element_factory, undo_manager):
    def copy_pos(pos):
        return tuple(map(float, pos))

    with Transaction(event_manager):
        diagram: Diagram = element_factory.create(Diagram)
        klass = element_factory.create(UML.Class)
        class_item = diagram.create(ClassItem, subject=klass)
        association = diagram.create(AssociationItem)
        connect(association, association.head, class_item)
        original_handle_pos = copy_pos(association.head.pos)

    with Transaction(event_manager):
        association.head.pos = (class_item.width, class_item.height)
        connect(association, association.head, class_item)
        new_handle_pos = copy_pos(association.head.pos)

    assert original_handle_pos != new_handle_pos

    undo_manager.undo_transaction()
    diagram.update(diagram.ownedPresentation)

    assert original_handle_pos == copy_pos(association.head.pos)


def test_exception_raised_during_undo(event_manager, element_factory, undo_manager):
    package: UML.Package = next(element_factory.select(UML.Package))

    with Transaction(event_manager):
        klass = element_factory.create(UML.Class)
        klass.package = package

    with Transaction(event_manager):
        klass.unlink()

    @event_handler(AssociationUpdated)
    def raise_an_exception(event):
        if event.property is UML.Class.package:
            raise ValueError("Test exception")

    event_manager.subscribe(raise_an_exception)

    with pytest.raises(ExceptionGroup):
        undo_manager.undo_transaction()


def test_exception_raised_during_undo_from_event_handler(
    event_manager, element_factory, undo_manager
):
    class UndoRequested:
        pass

    package: UML.Package = next(element_factory.select(UML.Package))

    with Transaction(event_manager):
        klass = element_factory.create(UML.Class)
        klass.package = package

    with Transaction(event_manager):
        klass.unlink()

    @event_handler(AssociationUpdated)
    def raise_an_exception(event):
        if event.property is UML.Class.package:
            raise ValueError("Test exception")

    event_manager.subscribe(raise_an_exception)

    @event_handler(UndoRequested)
    def on_undo_requested(event):
        undo_manager.undo_transaction()

    event_manager.subscribe(on_undo_requested)

    with pytest.raises(ExceptionGroup):
        event_manager.handle(UndoRequested())

    # Handle remaining events on the queue
    event_manager.handle()


def test_undo_paste_full(create, diagram, event_manager, undo_manager):
    """Triggers an error when pasted data is undone.

    Reproduce Hypothesis test found in https://github.com/gaphor/gaphor/issues/2895.
    """

    with Transaction(event_manager):
        class_item = create(ClassItem, UML.Class)
        containment_item = create(ContainmentItem)

        connect(containment_item, containment_item.head, class_item)

    copy_buffer = copy_full([containment_item, class_item])

    with Transaction(event_manager):
        paste_full(copy_buffer, diagram)

    undo_manager.undo_transaction()