"""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,
    ):
        """
        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.
        """
        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,
            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)
