pdk.py

"""PDK stores layers, cross_sections, cell functions ..."""

from __future__ import annotations

import importlib
import pathlib
import warnings
from collections.abc import Callable
from functools import partial
from typing import Any, Literal

import kfactory as kf
import numpy as np
import omegaconf
from kfactory import LayerEnum
from omegaconf import DictConfig
from pydantic import BaseModel, ConfigDict, Field, field_validator

from gdsfactory import show
from gdsfactory.config import CONF, logger
from gdsfactory.events import Event
from gdsfactory.read.from_yaml_template import cell_from_yaml_template
from gdsfactory.symbols import floorplan_with_block_letters
from gdsfactory.technology import LayerStack, LayerViews
from gdsfactory.typings import (
    CellSpec,
    Component,
    ComponentFactory,
    ComponentSpec,
    CrossSection,
    CrossSectionOrFactory,
    CrossSectionSpec,
    Layer,
    LayerSpec,
    MaterialSpec,
    PathType,
    Transition,
)

component_settings = ["function", "component", "settings"]
cross_section_settings = ["function", "cross_section", "settings"]

constants = {
    "fiber_array_spacing": 127.0,
    "fiber_spacing": 50.0,
    "fiber_input_to_output_spacing": 200.0,
    "metal_spacing": 10.0,
    "pad_spacing": 100.0,
    "pad_size": (80, 80),
}

nm = 1e-3


def evanescent_coupler_sample() -> None:
    """Evanescent coupler example.

    Args:
      coupler_length: length of coupling (min: 0.0, max: 200.0, um).
    """
    pass


def extract_args_from_docstring(docstring: str) -> dict[str, Any] | None:
    """
    This function extracts settings from a function's docstring for uPDK format.

    Args:
        docstring: The function from which to extract YAML in the docstring.

    Returns:
        settings (dict): The extracted YAML data as a dictionary.
    """
    args_dict = {}

    docstring_lines = docstring.split("\n")
    for line in docstring_lines:
        line = line.strip()
        if not line:
            continue
        if line.startswith("Args:"):
            continue
        if len(line.split(":")) != 2:
            continue
        name, description = line.split(":")
        name = name.strip()
        description_parts = description.split("(")
        doc = description_parts[0].strip()
        try:
            min_max_unit = description_parts[1].strip(")").split(",")
            min_val = float(min_max_unit[0].split(":")[1].strip())
            max_val = float(min_max_unit[1].split(":")[1].strip())
            unit = min_max_unit[2].strip()
        except IndexError:
            min_val = max_val = 0
            unit = None

        args_dict[name] = {
            "doc": doc,
            "min": min_val,
            "max": max_val,
            "type": "float",
            "unit": unit,
            "value": (min_val + max_val) / 2,  # setting default value as the midpoint
        }

    return args_dict


class GdsWriteSettings(BaseModel):
    """Settings to use when writing to GDS."""

    on_uncached_component: Literal["warn", "error", "ignore"] = "ignore"
    lib_name: str = Field(
        default="library",
        description="Name of the GDS library to write to. Default is 'library'.",
    )
    unit: float = Field(
        default=1e-6,
        description="The units of coordinates in the database. The default is 1e-6 (1 micron).",
    )
    precision: float = Field(
        default=1e-9,
        description="The maximum precision of points in the database. For example, a value of 1e-9 would mean that you have a 1nm grid",
    )
    on_duplicate_cell: str = Field(
        default="warn",
        description="""Action to take when a duplicate cell is encountered on gds write (usually problematic). Options are
                        "warn" (default): overwrite all duplicate cells with one of the duplicates (arbitrarily).
                        "error": throw a ValueError when attempting to write a gds with duplicate cells.
                        "overwrite": overwrite all duplicate cells with one of the duplicates, without warning.""",
    )
    flatten_invalid_refs: bool = Field(
        default=False,
        description="If true, will auto-correct (and flatten) cell references which are off-grid or rotated by non-manhattan angles.",
    )
    max_points: int = Field(
        default=4000,
        description="Maximum number of points to allow in a polygon before fracturing.",
    )


class OasisWriteSettings(BaseModel):
    compression_level: int = Field(
        default=6,
        description="Level of compression for cells (between 0 and 9). Setting to 0 will disable cell compression, 1 gives the best speed, and 9 gives the best compression.",
    )
    detect_rectangles: bool = Field(
        default=True, description="If true, stores rectangles in a compressed format."
    )
    detect_trapezoids: bool = Field(
        default=True, description="If true, stores trapezoids in a compressed format."
    )
    circle_tolerance: float = Field(
        default=0,
        description="Tolerance for detecting circles. If less or equal to 0, no detection is performed. Circles are stored in compressed format.",
    )
    validation: str | None = Field(
        default=None,
        description="Type of validation to include in the saved file ('crc32', 'checksum32', or None).",
    )
    standard_properties: bool = Field(
        default=False,
        description="If true, stores standard OASIS properties in the file.",
    )


class CellDecoratorSettings(BaseModel):
    """Settings for cell_without_validator decorator function in gdsfactory.cell."""

    with_hash: bool = Field(
        default=False,
        description="If true, will append a hash of the cell to the cell name.",
    )
    autoname: bool = Field(
        default=True,
        description="If true, will automatically name the cell based on its parameters.",
    )
    name: str | None = Field(
        default=None,
        description="If set, will override the cell name with this value.",
    )
    cache: bool = Field(
        default=True,
        description="If true, will cache the cell in the gdsfactory.cell.CACHE",
    )
    flatten: bool = Field(
        default=False,
        description="If true, will flatten the cell before returning it.",
    )
    info: dict[str, Any] = Field(
        default={},
        description="Additional information to store in the cell.",
    )
    prefix: str | None = Field(
        default=None,
        description="If set, will prepend this string to the cell name.",
    )
    max_name_length: int = Field(
        default=CONF.max_name_length,
        description="Maximum length of the cell name.",
    )
    include_module: bool = Field(
        default=False,
        description="If true, will include the module in the autogenerated component name.",
    )
    naming_style: Literal["default", "updk"] = Field(
        default="default", description="Naming style for autogenerated component names."
    )


class Pdk(BaseModel):
    """Store layers, cross_sections, cell functions, simulation_settings ...

    only one Pdk can be active at a given time.

    Parameters:
        name: PDK name.
        cross_sections: dict of cross_sections factories.
        cells: dict of parametric cells that return Components.
        symbols: dict of symbols names to functions.
        default_symbol_factory:
        base_pdk: a pdk to copy from and extend.
        default_decorator: decorate all cells, if not otherwise defined on the cell.
        layers: maps name to gdslayer/datatype.
            For example dict(si=(1, 0), sin=(34, 0)).
        layer_stack: maps name to layer numbers, thickness, zmin, sidewall_angle.
            if can also contain material properties
            (refractive index, nonlinear coefficient, sheet resistance ...).
        layer_views: includes layer name to color, opacity and pattern.
        layer_transitions: transitions between different cross_sections.
        sparameters_path: to store Sparameters simulations.
        modes_path: to store Sparameters simulations.
        interconnect_cml_path: path to interconnect CML (optional).
        constants: dict of constants for the PDK.
        materials_index: material spec names to material spec, which can be:
            string: material name.
            float: refractive index.
            float, float: refractive index real and imaginary part.
            function: function of wavelength.
        routing_strategies: functions enabled to route.
        gds_write_settings: to write GDSII files.
        oasis_settings: to write OASIS files.
        cell_decorator_settings: settings for cell_without_validator decorator function in gdsfactory.cell.
        bend_points_distance: default points distance for bends in um.

    """

    name: str
    cross_sections: dict[str, CrossSectionOrFactory] = Field(
        default_factory=dict, exclude=True
    )
    cells: dict[str, ComponentFactory] = Field(default_factory=dict, exclude=True)
    symbols: dict[str, ComponentFactory] = Field(default_factory=dict)
    default_symbol_factory: Callable = Field(
        default=floorplan_with_block_letters, exclude=True
    )
    base_pdk: Pdk | None = None
    default_decorator: Callable[[Component], None] | None = Field(
        default=None, exclude=True
    )
    layers: type[LayerEnum]
    layer_stack: LayerStack | None = None
    layer_views: LayerViews | None = None
    layer_transitions: dict[Layer | tuple[Layer, Layer], ComponentSpec] = Field(
        default_factory=dict
    )
    sparameters_path: PathType | None = Field(
        default=None, description="This field is deprecated."
    )

    modes_path: PathType | None = Field(
        default=None, description="This field is deprecated."
    )
    interconnect_cml_path: PathType | None = Field(
        default=None, description="This field is deprecated."
    )
    constants: dict[str, Any] = constants
    materials_index: dict[str, MaterialSpec] = Field(default_factory=dict)
    routing_strategies: dict[str, Callable] | None = None
    gds_write_settings: GdsWriteSettings = GdsWriteSettings()
    oasis_settings: OasisWriteSettings = OasisWriteSettings()
    cell_decorator_settings: CellDecoratorSettings = CellDecoratorSettings()
    bend_points_distance: float = 20 * nm

    model_config = ConfigDict(
        arbitrary_types_allowed=True,
        ignore_extra=True,
        extra="forbid",
    )

    def __init__(self, **data):
        if "sparameters_path" in data:
            warnings.warn(
                "The 'pdk.sparameters_path' is deprecated. Use gf.config.PATH instead",
            )
        if "modes_path" in data:
            warnings.warn(
                "The 'pdk.modes_path' is deprecated. Use gf.config.PATH instead",
            )
        super().__init__(**data)

    @property
    def grid_size(self):
        """The minimum unit resolvable on the layout grid, relative to the unit."""
        return self.gds_write_settings.precision / self.gds_write_settings.unit

    @grid_size.setter
    def grid_size(self, value) -> None:
        self.gds_write_settings.precision = value * self.gds_write_settings.unit

    @field_validator("sparameters_path")
    def is_pathlib_path(cls, path):
        return pathlib.Path(path)

    def validate_layers(self, layers_required: list[Layer] | None = None):
        """Raises ValueError if layers_required are not in Pdk."""
        if layers_required is None:
            layers_required = []
        for layer in layers_required:
            if layer not in self.layers:
                raise ValueError(
                    f"{layer!r} not in Pdk.layers {list(self.layers.keys())}"
                )

    def activate(self) -> None:
        """Set current pdk to the active pdk (if not already active)."""
        global _ACTIVE_PDK
        if self is _ACTIVE_PDK:
            return None

        logger.info(f"{self.name!r} PDK is now active")

        if self.base_pdk:
            self.add_base_pdk()
        layers_required = []
        self.validate_layers(layers_required)
        _set_active_pdk(self)

    def add_base_pdk(self):
        """Update pdk with self.base_pdk."""
        cross_sections = self.base_pdk.cross_sections
        cross_sections.update(self.cross_sections)
        cells = self.base_pdk.cells
        self.cross_sections = cross_sections
        cells.update(self.cells)
        self.cells.update(cells)

        layers = self.base_pdk.layers
        layers.update(self.layers)
        self.layers.update(layers)

        if not self.default_decorator:
            self.default_decorator = self.base_pdk.default_decorator

    def register_cells(self, **kwargs) -> None:
        """Register cell factories."""
        for name, cell in kwargs.items():
            if not callable(cell):
                raise ValueError(
                    f"{cell} is not callable, make sure you register "
                    "cells functions that return a Component"
                )
            if name in self.cells:
                warnings.warn(f"Overwriting cell {name!r}")

            self.cells[name] = cell
            on_cell_registered.fire(name=name, cell=cell, pdk=self)

    def register_cross_sections(self, **kwargs) -> None:
        """Register cross_sections factories."""
        for name, cross_section in kwargs.items():
            if not callable(cross_section):
                raise ValueError(
                    f"{cross_section} is not callable, make sure you register "
                    "cross_section functions that return a CrossSection"
                )
            if name in self.cross_sections:
                warnings.warn(f"Overwriting cross_section {name!r}")
            self.cross_sections[name] = cross_section
            on_cross_section_registered.fire(
                name=name, cross_section=cross_section, pdk=self
            )

    def register_cells_yaml(
        self,
        dirpath: PathType | None = None,
        update: bool = False,
        **kwargs,
    ) -> None:
        """Load *.pic.yml YAML files and register them as cells.

        Args:
            dirpath: directory to recursive search for YAML cells.
            update: does not raise ValueError if cell already registered.

        Keyword Args:
            cell_name: cell function. To update cells dict.

        """

        message = "Updated" if update else "Registered"

        if dirpath:
            dirpath = pathlib.Path(dirpath)

            if not dirpath.is_dir():
                raise ValueError(f"{dirpath!r} needs to be a directory.")

            for filepath in dirpath.glob("**/*.pic.yml"):
                name = filepath.stem.split(".")[0]
                if not update and name in self.cells:
                    raise ValueError(
                        f"ERROR: Cell name {name!r} from {filepath} already registered."
                    )
                self.cells[name] = cell_from_yaml_template(filepath, name=name)
                on_yaml_cell_registered.fire(name=name, cell=self.cells[name], pdk=self)
                logger.info(f"{message} cell {name!r}")

        for k, v in kwargs.items():
            if not update and k in self.cells:
                raise ValueError(f"ERROR: Cell name {k!r} already registered.")
            self.cells[k] = v
            logger.info(f"{message} cell {k!r}")

    def remove_cell(self, name: str):
        """Removes cell from a PDK."""
        if name not in self.cells:
            raise ValueError(f"{name!r} not in {list(self.cells.keys())}")
        self.cells.pop(name)
        logger.info(f"Removed cell {name!r}")

    def get_cell(self, cell: CellSpec, **kwargs) -> ComponentFactory:
        """Returns ComponentFactory from a cell spec."""
        cells = set(self.cells.keys())

        if callable(cell):
            return cell
        elif isinstance(cell, str):
            if cell not in cells:
                cells = list(self.cells.keys())
                raise ValueError(
                    f"{cell!r} from PDK {self.name!r} not in cells: {cells} "
                )
            return self.cells[cell]
        elif isinstance(cell, dict | DictConfig):
            for key in cell.keys():
                if key not in component_settings:
                    raise ValueError(
                        f"Invalid setting {key!r} not in {component_settings}"
                    )
            settings = dict(cell.get("settings", {}))
            settings.update(**kwargs)

            cell_name = cell.get("function")
            if not isinstance(cell_name, str) or cell_name not in cells:
                cells = list(self.cells.keys())
                raise ValueError(
                    f"{cell_name!r} from PDK {self.name!r} not in cells: {cells} "
                )
            cell = self.cells[cell_name]
            return partial(cell, **settings)
        else:
            raise ValueError(
                "get_cell expects a CellSpec (ComponentFactory, string or dict),"
                f"got {type(cell)}"
            )

    def get_component(self, component: ComponentSpec, **kwargs) -> Component:
        """Returns component from a component spec."""
        return self._get_component(component=component, cells=self.cells, **kwargs)

    def get_symbol(self, component: ComponentSpec, **kwargs) -> Component:
        """Returns a component's symbol from a component spec."""
        # this is a pretty rough first implementation
        try:
            self._get_component(component=component, cells=self.symbols, **kwargs)
        except ValueError:
            component = self.get_component(component, **kwargs)
            return self.default_symbol_factory(component)

    def _get_component(
        self,
        component: ComponentSpec,
        cells: dict[str, Callable],
        **kwargs,
    ) -> Component:
        """Returns component from a component spec."""
        cells = set(cells.keys())

        if isinstance(component, Component):
            if kwargs:
                raise ValueError(f"Cannot apply kwargs {kwargs} to {component.name!r}")
            return component
        elif callable(component):
            return component(**kwargs)
        elif isinstance(component, str):
            if component not in cells:
                raise ValueError(
                    f"{component!r} not in PDK {self.name!r} cells: {cells} "
                )
            return self.cells[component](**kwargs)
        elif isinstance(component, dict | DictConfig):
            for key in component.keys():
                if key not in component_settings:
                    raise ValueError(
                        f"Invalid setting {key!r} not in {component_settings}"
                    )
            settings = dict(component.get("settings", {}))
            settings.update(**kwargs)

            cell_name = component.get("component", None)
            cell_name = cell_name or component.get("function")
            cell_name = cell_name.split(".")[-1]

            if not isinstance(cell_name, str) or cell_name not in cells:
                raise ValueError(
                    f"{cell_name!r} from PDK {self.name!r} not in cells: {cells} "
                )
            return self.cells[cell_name](**settings)
        else:
            raise ValueError(
                "get_component expects a ComponentSpec (Component, ComponentFactory, "
                f"string or dict), got {type(component)}"
            )

    def get_cross_section(
        self, cross_section: CrossSectionSpec, **kwargs
    ) -> CrossSection | Transition:
        """Returns cross_section from a cross_section spec."""
        if isinstance(cross_section, CrossSection):
            return cross_section.copy(**kwargs)
        elif isinstance(cross_section, Transition):
            return cross_section
        elif callable(cross_section):
            return cross_section(**kwargs)
        elif isinstance(cross_section, str):
            if cross_section not in self.cross_sections:
                cross_sections = list(self.cross_sections.keys())
                raise ValueError(f"{cross_section!r} not in {cross_sections}")
            xs = self.cross_sections[cross_section]
            return xs(**kwargs) if callable(xs) else xs.copy(**kwargs)
        elif isinstance(cross_section, dict | DictConfig):
            xs_name = cross_section.get("cross_section", None)
            settings = cross_section.get("settings", {})
            xs = self.get_cross_section(xs_name)
            return xs.copy(**settings)
        else:
            raise ValueError(
                "get_cross_section expects a CrossSectionSpec (CrossSection, "
                f"CrossSectionFactory, Transition, string or dict), got {type(cross_section)}"
            )

    def get_layer(self, layer: LayerSpec) -> Layer:
        """Returns layer from a layer spec."""
        if isinstance(layer, LayerEnum):
            return layer
        elif isinstance(layer, tuple | list):
            if len(layer) != 2:
                raise ValueError(f"{layer!r} needs two integer numbers.")
            return kf.kcl.layer(*layer)
        elif isinstance(layer, str):
            if not hasattr(self.layers, layer):
                raise ValueError(f"{layer!r} not in {self.layers}")
            return getattr(self.layers, layer)
        elif isinstance(layer, int):
            return layer
        elif layer is np.nan:
            return np.nan
        elif layer is None:
            return
        else:
            raise ValueError(
                f"{layer!r} needs to be a LayerSpec (string, int or (int, int) or LayerEnum), got {type(layer)}"
            )

    def get_layer_views(self) -> LayerViews:
        if self.layer_views is None:
            raise ValueError(f"layer_views for Pdk {self.name!r} is None")
        return self.layer_views

    def get_layer_stack(self) -> LayerStack:
        if self.layer_stack is None:
            raise ValueError(f"layer_stack for Pdk {self.name!r} is None")
        return self.layer_stack

    def get_constant(self, key: str) -> Any:
        if not isinstance(key, str):
            return key
        if key not in self.constants:
            constants = list(self.constants.keys())
            raise ValueError(f"{key!r} not in {constants}")
        return self.constants[key]

    def get_material_index(self, key: str, *args, **kwargs) -> float:
        warnings.warn("get_material_index is deprecated")
        if key not in self.materials_index:
            material_names = list(self.materials_index.keys())
            raise ValueError(f"{key!r} not in {material_names}")
        material = self.materials_index[key]
        return material(*args, **kwargs) if callable(material) else material

    def to_updk(self) -> str:
        """Export to uPDK YAML definition."""
        from gdsfactory.components.bbox import bbox_to_points

        blocks = {cell_name: cell() for cell_name, cell in self.cells.items()}
        blocks = {
            name: dict(
                bbox=bbox_to_points(c.bbox),
                doc=c.__doc__.split("\n")[0],
                settings=extract_args_from_docstring(c.__doc__),
                parameters={
                    sname: {
                        "value": svalue,
                        "type": str(svalue.__class__.__name__),
                        "doc": extract_args_from_docstring(c.__doc__)
                        .get(sname, {})
                        .get("doc", None),
                        "min": extract_args_from_docstring(c.__doc__)
                        .get(sname, {})
                        .get("min", 0),
                        "max": extract_args_from_docstring(c.__doc__)
                        .get(sname, {})
                        .get("max", 0),
                        "unit": extract_args_from_docstring(c.__doc__)
                        .get(sname, {})
                        .get("unit", None),
                    }
                    for sname, svalue in c.settings.full.items()
                    if isinstance(svalue, str | float | int)
                },
                pins={
                    port_name: {
                        "width": port.width,
                        "xsection": port.cross_section.name
                        if port.cross_section
                        else None,
                        "xya": [
                            float(port.center[0]),
                            float(port.center[1]),
                            float(port.orientation),
                        ],
                        "alias": port.info.get("alias"),
                        "doc": port.info.get("doc"),
                    }
                    for port_name, port in c.ports.items()
                },
            )
            for name, c in blocks.items()
        }
        xsections = {
            xs_name: self.get_cross_section(xs_name)
            for xs_name in self.cross_sections.keys()
        }
        xsections = {
            xs_name: dict(width=xsection.width)
            for xs_name, xsection in xsections.items()
        }

        header = dict(description=self.name)

        d = {"blocks": blocks, "xsections": xsections, "header": header}
        return omegaconf.OmegaConf.to_yaml(d)

    # _on_cell_registered = Event()
    # _on_container_registered: Event = Event()
    # _on_yaml_cell_registered: Event = Event()
    # _on_cross_section_registered: Event = Event()
    #
    # @property
    # def on_cell_registered(self) -> Event:
    #     return self._on_cell_registered
    #
    # @property
    # def on_container_registered(self) -> Event:
    #     return self._on_container_registered
    #
    # @property
    # def on_yaml_cell_registered(self) -> Event:
    #     return self._on_yaml_cell_registered
    #
    # @property
    # def on_cross_section_registered(self) -> Event:
    #     return self._on_cross_section_registered

    def get_cross_section_name(self, cross_section: CrossSection) -> str:
        xs_name = next(
            (
                key
                for key, value in self.cross_sections.items()
                if value == cross_section
            ),
            None,
        )
        return xs_name or cross_section.name


_ACTIVE_PDK = None


def get_active_pdk(name: str | None = None) -> Pdk:
    """Returns active PDK.
    By default it will return the PDK defined in the name or config file.
    Otherwise it will return the generic PDK.
    """
    global _ACTIVE_PDK

    if _ACTIVE_PDK is None:
        if name is not None or CONF.pdk:
            pdk_module = importlib.import_module(name or CONF.pdk)
            pdk_module.PDK.activate()

        else:
            logger.debug("No active PDK. Activating generic PDK.\n")
            from gdsfactory.generic_tech import get_generic_pdk

            PDK = get_generic_pdk()
            PDK.activate()
            _ACTIVE_PDK = PDK
    return _ACTIVE_PDK


def get_material_index(material: MaterialSpec, *args, **kwargs) -> Component:
    return get_active_pdk().get_material_index(material, *args, **kwargs)


def get_component(component: ComponentSpec, **kwargs) -> Component:
    return get_active_pdk().get_component(component, **kwargs)


def get_cell(cell: CellSpec, **kwargs) -> ComponentFactory:
    return get_active_pdk().get_cell(cell, **kwargs)


def get_cross_section(
    cross_section: CrossSectionSpec, **kwargs
) -> CrossSection | Transition:
    return get_active_pdk().get_cross_section(cross_section, **kwargs)


def get_layer(layer: LayerSpec) -> Layer:
    return get_active_pdk().get_layer(layer)


def get_layer_views() -> LayerViews:
    return get_active_pdk().get_layer_views()


def get_layer_stack() -> LayerStack:
    return get_active_pdk().get_layer_stack()


def get_grid_size() -> float:
    return get_active_pdk().grid_size


def get_constant(constant_name: Any) -> Any:
    """If constant_name is a string returns a the value from the dict."""
    return (
        get_active_pdk().get_constant(constant_name)
        if isinstance(constant_name, str)
        else constant_name
    )


def get_capacitance_path() -> pathlib.Path:
    warnings.warn(
        "get_capacitance_path() is deprecated. gf.config.PATH.capacitance instead",
    )
    PDK = get_active_pdk()
    if PDK.capacitance_path is None:
        raise ValueError(f"{_ACTIVE_PDK.name!r} has no capacitance_path")
    return PDK.capacitance_path


def get_sparameters_path() -> pathlib.Path:
    warnings.warn(
        "get_sparameters_path() is deprecated. gf.config.PATH.sparameters instead",
    )
    PDK = get_active_pdk()
    if PDK.sparameters_path is None:
        raise ValueError(f"{_ACTIVE_PDK.name!r} has no sparameters_path")
    return PDK.sparameters_path


def get_modes_path() -> pathlib.Path | None:
    warnings.warn(
        "get_modes_path() is deprecated. gf.config.PATH.modes instead",
    )
    PDK = get_active_pdk()
    return PDK.modes_path


def get_interconnect_cml_path() -> pathlib.Path:
    warnings.warn(
        "get_interconnect_cml_path() is deprecated. gf.config.PATH.interconnect_cml instead",
    )
    PDK = get_active_pdk()
    if PDK.interconnect_cml_path is None:
        raise ValueError(f"{_ACTIVE_PDK.name!r} has no interconnect_cml_path")
    return PDK.interconnect_cml_path


def _set_active_pdk(pdk: Pdk) -> None:
    global _ACTIVE_PDK
    old_pdk = _ACTIVE_PDK
    _ACTIVE_PDK = pdk
    on_pdk_activated.fire(old_pdk=old_pdk, new_pdk=pdk)


def get_routing_strategies() -> dict[str, Callable]:
    """Gets a dictionary of named routing functions available to the PDK, if defined, or gdsfactory defaults otherwise."""
    from gdsfactory.routing.factories import (
        routing_strategy as default_routing_strategies,
    )

    routing_strategies = get_active_pdk().routing_strategies
    if routing_strategies is None:
        routing_strategies = default_routing_strategies
    return routing_strategies


on_pdk_activated: Event = Event()
on_cell_registered: Event = Event()
on_container_registered: Event = Event()
on_yaml_cell_registered: Event = Event()
on_yaml_cell_modified: Event = Event()
on_cross_section_registered: Event = Event()

on_container_registered.add_handler(on_cell_registered.fire)
on_yaml_cell_registered.add_handler(on_cell_registered.fire)
on_yaml_cell_modified.add_handler(show)


if __name__ == "__main__":
    l1 = get_layer((1, 0))
    l2 = get_layer((3, 0))
    print(l1)
    print(l2)