from __future__ import annotations

from typing import TYPE_CHECKING

import napari
from napari.layers.base._base_constants import Mode
from napari.layers.image.image import Image
from napari.layers.utils.interactivity_utils import (
    orient_plane_normal_around_cursor,
)
from napari.layers.utils.layer_utils import (
    register_layer_action,
    register_layer_attr_action,
)
from napari.utils.action_manager import action_manager
from napari.utils.events import Event

if TYPE_CHECKING:
    from collections.abc import Callable, Generator


def register_image_action(
    description: str, repeatable: bool = False
) -> Callable[[Callable], Callable]:
    return register_layer_action(Image, description, repeatable)


def register_image_mode_action(
    description: str,
) -> Callable[[Callable], Callable]:
    return register_layer_attr_action(Image, description, 'mode')


@register_image_action('Apply auto-contrast')
def auto_contrast_once(layer: Image) -> None:
    """Apply auto-contrast."""
    layer.reset_contrast_limits()


# TODO: how to make these 4 actions only work for `Selection[Image]`?
#       Doesn't work cause Selection[Image] is technically not a subtype
#       of `Selection[Layer]`...
@register_image_action('Orient plane normal along z-axis')
def orient_plane_normal_along_z(layer: Image) -> None:
    orient_plane_normal_around_cursor(layer, plane_normal=(1, 0, 0))


@register_image_action('Orient plane normal along y-axis')
def orient_plane_normal_along_y(layer: Image) -> None:
    orient_plane_normal_around_cursor(layer, plane_normal=(0, 1, 0))


@register_image_action('Orient plane normal along x-axis')
def orient_plane_normal_along_x(layer: Image) -> None:
    orient_plane_normal_around_cursor(layer, plane_normal=(0, 0, 1))


@register_image_action(
    'Orient plane normal along view direction\nHold down to have plane follow camera'
)
def orient_plane_normal_along_view_direction(
    layer: Image,
) -> Generator[None, None, None] | None:
    viewer = napari.viewer.current_viewer()
    if viewer is None or viewer.dims.ndisplay != 3:
        return None

    def sync_plane_normal_with_view_direction(
        event: Event | None = None,
    ) -> None:
        """Plane normal syncronisation mouse callback."""
        layer.plane.normal = layer._world_to_displayed_data_normal(
            viewer.scene.camera.view_direction, [-3, -2, -1]
        )

    # update plane normal and add callback to mouse drag
    sync_plane_normal_with_view_direction()
    viewer.scene.camera.events.angles.connect(
        sync_plane_normal_with_view_direction
    )
    yield None
    # remove callback on key release
    viewer.scene.camera.events.angles.disconnect(
        sync_plane_normal_with_view_direction
    )
    return None


# The generator function above can't be bound to a button, so here
# is a non-generator version of the function
def orient_plane_normal_along_view_direction_no_gen(
    layer: Image,
) -> None:
    viewer = napari.viewer.current_viewer()
    if viewer is None or viewer.dims.ndisplay != 3:
        return
    layer.plane.normal = layer._world_to_displayed_data_normal(
        viewer.scene.camera.view_direction, [-3, -2, -1]
    )


# register the non-generator without a keybinding
# this way the generator version owns the keybinding
action_manager.register_action(
    name='napari:orient_plane_normal_along_view_direction_no_gen',
    command=orient_plane_normal_along_view_direction_no_gen,
    description='Orient plane normal along view direction button',
    keymapprovider=None,
)


@register_image_mode_action('Transform')
def activate_image_transform_mode(layer: Image) -> None:
    layer.mode = str(Mode.TRANSFORM)


@register_image_mode_action('Move camera')
def activate_image_pan_zoom_mode(layer: Image) -> None:
    layer.mode = str(Mode.PAN_ZOOM)


image_fun_to_mode = [
    (activate_image_pan_zoom_mode, Mode.PAN_ZOOM),
    (activate_image_transform_mode, Mode.TRANSFORM),
]
