"""gr.Code() component"""

from __future__ import annotations

from pathlib import Path
from typing import Any, Callable, Literal

from gradio_client.documentation import document

from gradio.components.base import Component
from gradio.events import Events


@document("languages")
class Code(Component):
    """
    Creates a code editor for viewing code (as an output component), or for entering and editing code (as an input component).
    """

    languages = [
        "python",
        "markdown",
        "json",
        "html",
        "css",
        "javascript",
        "typescript",
        "yaml",
        "dockerfile",
        "shell",
        "r",
        "sql",
        "sql-msSQL",
        "sql-mySQL",
        "sql-mariaDB",
        "sql-sqlite",
        "sql-cassandra",
        "sql-plSQL",
        "sql-hive",
        "sql-pgSQL",
        "sql-gql",
        "sql-gpSQL",
        "sql-sparkSQL",
        "sql-esper",
        None,
    ]

    EVENTS = [
        Events.change,
        Events.input,
        Events.focus,
        Events.blur,
    ]

    def __init__(
        self,
        value: str | Callable | tuple[str] | None = None,
        language: Literal[
            "python",
            "markdown",
            "json",
            "html",
            "css",
            "javascript",
            "typescript",
            "yaml",
            "dockerfile",
            "shell",
            "r",
            "sql",
            "sql-msSQL",
            "sql-mySQL",
            "sql-mariaDB",
            "sql-sqlite",
            "sql-cassandra",
            "sql-plSQL",
            "sql-hive",
            "sql-pgSQL",
            "sql-gql",
            "sql-gpSQL",
            "sql-sparkSQL",
            "sql-esper",
        ]
        | None = None,
        *,
        every: float | None = None,
        lines: int = 5,
        label: str | None = None,
        interactive: bool | None = None,
        show_label: bool | None = None,
        container: bool = True,
        scale: int | None = None,
        min_width: int = 160,
        visible: bool = True,
        elem_id: str | None = None,
        elem_classes: list[str] | str | None = None,
        render: bool = True,
        key: int | str | None = None,
    ):
        """
        Parameters:
            value: Default value to show in the code editor. If callable, the function will be called whenever the app loads to set the initial value of the component.
            language: The language to display the code as. Supported languages listed in `gr.Code.languages`.
            every: If `value` is a callable, run the function 'every' number of seconds while the client connection is open. Has no effect otherwise. The event can be accessed (e.g. to cancel it) via this component's .load_event attribute.
            label: The label for this component. Appears above the component and is also used as the header if there are a table of examples for this component. If None and used in a `gr.Interface`, the label will be the name of the parameter this component is assigned to.
            interactive: Whether user should be able to enter code or only view it.
            show_label: if True, will display label.
            container: If True, will place the component in a container - providing some extra padding around the border.
            scale: relative size compared to adjacent Components. For example if Components A and B are in a Row, and A has scale=2, and B has scale=1, A will be twice as wide as B. Should be an integer. scale applies in Rows, and to top-level Components in Blocks where fill_height=True.
            min_width: minimum pixel width, will wrap if not sufficient screen space to satisfy this value. If a certain scale value results in this Component being narrower than min_width, the min_width parameter will be respected first.
            visible: If False, component will be hidden.
            elem_id: An optional string that is assigned as the id of this component in the HTML DOM. Can be used for targeting CSS styles.
            elem_classes: An optional list of strings that are assigned as the classes of this component in the HTML DOM. Can be used for targeting CSS styles.
            render: If False, component will not render be rendered in the Blocks context. Should be used if the intention is to assign event listeners now but render the component later.
            key: if assigned, will be used to assume identity across a re-render. Components that have the same key across a re-render will have their value preserved.
        """
        if language not in Code.languages:
            raise ValueError(f"Language {language} not supported.")

        self.language = language
        self.lines = lines
        super().__init__(
            label=label,
            every=every,
            interactive=interactive,
            show_label=show_label,
            container=container,
            scale=scale,
            min_width=min_width,
            visible=visible,
            elem_id=elem_id,
            elem_classes=elem_classes,
            render=render,
            key=key,
            value=value,
        )

    def preprocess(self, payload: str | None) -> str | None:
        """
        Parameters:
            payload: string corresponding to the code
        Returns:
            Passes the code entered as a `str`.
        """
        return payload

    def postprocess(self, value: tuple[str] | str | None) -> None | str:
        """
        Parameters:
            value: Expects a `str` of code or a single-element `tuple`: (filepath,) with the `str` path to a file containing the code.
        Returns:
            Returns the code as a `str`.
        """
        if value is None:
            return None
        elif isinstance(value, tuple):
            with open(value[0], encoding="utf-8") as file_data:
                return file_data.read()
        else:
            return value.strip()

    def api_info(self) -> dict[str, Any]:
        return {"type": "string"}

    def example_payload(self) -> Any:
        return "print('Hello World')"

    def example_value(self) -> Any:
        return "print('Hello World')"

    def process_example(self, value: str | tuple[str] | None) -> str | None:
        if isinstance(value, tuple):
            return Path(value[0]).name
        return super().process_example(value)