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# SPDX-License-Identifier: MIT
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"""Transformation handler for ``INCLUDE_TRANSFORM``."""

import typing
import warnings

from ansys.dyna.core.lib.import_handler import ImportContext, ImportHandler
from ansys.dyna.core.lib.keyword_base import KeywordBase
from ansys.dyna.core.lib.transforms.base_transform import Transform
from ansys.dyna.core.lib.transforms.element_transform import TransformElement
from ansys.dyna.core.lib.transforms.node_transform import TransformNode


class TransformHandler(ImportHandler):
    def __init__(self):
        self._handlers: typing.Dict[typing.Union[str, typing.Tuple[str, str]], Transform] = {
            "NODE": TransformNode,
            "ELEMENT": TransformElement,
        }

    def register_transform_handler(
        self, identity: typing.Union[str, typing.Tuple[str, str]], handler: Transform
    ) -> None:
        """Register a transform handler for a specific keyword or keyword+subkeyword."""
        self._handlers[identity] = handler

    def after_import(self, context: ImportContext, keyword: typing.Union[KeywordBase, str]) -> None:
        """Handle actions after importing a keyword."""
        if not isinstance(keyword, KeywordBase):
            return
        if context.xform is None:
            return
        # first try to get the specialized handler for the keyword + subkeyword
        identity = (keyword.keyword, keyword.subkeyword)
        handler = self._handlers.get(identity, None)
        if handler is None:
            # then try to get the handler for the keyword
            identity = keyword.keyword
            handler = self._handlers.get(identity, None)
            if handler is None:
                warnings.warn()
                return

        # if a handler was found, initialize it with the xform from the context
        # and transform the keyword with it
        handler(context.xform).transform(keyword)

    def on_error(self, error):
        """Handle errors during import."""
        pass
