"""Next.js script wrappers and inline script functionality.
https://nextjs.org/docs/app/api-reference/components/script.
"""
from __future__ import annotations

from typing import Any, Optional, Union

from reflex.components.component import Component
from reflex.vars import Var


class Script(Component):
    """Next.js script component.

    Note that this component differs from reflex.components.base.document.NextScript
    in that it is intended for use with custom and user-defined scripts.

    It also differs from reflex.components.base.link.ScriptTag, which is the plain
    HTML <script> tag which does not work when rendering a component.
    """

    library = "next/script"
    tag: str = "Script"
    is_default: bool = True

    # Required unless inline script is used
    src: Optional[Var[str]] = None

    # When the script will execute: afterInteractive | beforeInteractive | lazyOnload
    strategy: Var[str] = "afterInteractive"  # type: ignore

    @classmethod
    def create(cls, *children, **props) -> Component:
        """Create an inline or user-defined script.

        If a string is provided as the first child, it will be rendered as an inline script
        otherwise the `src` prop must be provided.

        The following event triggers are provided:

        on_load: Execute code after the script has finished loading.
        on_ready: Execute code after the script has finished loading and every
            time the component is mounted.
        on_error: Execute code if the script fails to load.

        Args:
            *children: The children of the component.
            **props: The props of the component.

        Returns:
            The component.

        Raises:
            ValueError: when neither children nor `src` are specified.
        """
        if not children and not props.get("src"):
            raise ValueError("Must provide inline script or `src` prop.")
        return super().create(*children, **props)

    def get_event_triggers(self) -> dict[str, Union[Var, Any]]:
        """Get the event triggers for the component.

        Returns:
            The event triggers.
        """
        return {
            **super().get_event_triggers(),
            "on_load": lambda: [],
            "on_ready": lambda: [],
            "on_error": lambda: [],
        }