"""gr.UploadButton() component."""

from __future__ import annotations

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

import gradio_client.utils as client_utils
from gradio_client import handle_file
from gradio_client.documentation import document

from gradio import processing_utils
from gradio.components.base import Component
from gradio.data_classes import FileData, ListFiles
from gradio.events import Events
from gradio.utils import NamedString


@document()
class UploadButton(Component):
    """
    Used to create an upload button, when clicked allows a user to upload files that satisfy the specified file type or generic files (if file_type not set).

    Demos: upload_and_download, upload_button
    """

    EVENTS = [Events.click, Events.upload]

    def __init__(
        self,
        label: str = "Upload a File",
        value: str | list[str] | Callable | None = None,
        *,
        every: float | None = None,
        variant: Literal["primary", "secondary", "stop"] = "secondary",
        visible: bool = True,
        size: Literal["sm", "lg"] | None = None,
        icon: str | None = None,
        scale: int | None = None,
        min_width: int | None = None,
        interactive: bool = True,
        elem_id: str | None = None,
        elem_classes: list[str] | str | None = None,
        render: bool = True,
        key: int | str | None = None,
        type: Literal["filepath", "bytes"] = "filepath",
        file_count: Literal["single", "multiple", "directory"] = "single",
        file_types: list[str] | None = None,
    ):
        """
        Parameters:
            label: Text to display on the button. Defaults to "Upload a File".
            value: File or list of files to upload by default.
            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.
            variant: 'primary' for main call-to-action, 'secondary' for a more subdued style, 'stop' for a stop button.
            visible: If False, component will be hidden.
            size: Size of the button. Can be "sm" or "lg".
            icon: URL or path to the icon file to display within the button. If None, no icon will be displayed.
            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.
            interactive: If False, the UploadButton will be in a disabled state.
            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.
            type: Type of value to be returned by component. "file" returns a temporary file object with the same base name as the uploaded file, whose full path can be retrieved by file_obj.name, "binary" returns an bytes object.
            file_count: if single, allows user to upload one file. If "multiple", user uploads multiple files. If "directory", user uploads all files in selected directory. Return type will be list for each file in case of "multiple" or "directory".
            file_types: List of type of files to be uploaded. "file" allows any file to be uploaded, "image" allows only image files to be uploaded, "audio" allows only audio files to be uploaded, "video" allows only video files to be uploaded, "text" allows only text files to be uploaded.
        """
        valid_types = [
            "filepath",
            "binary",
        ]
        if type not in valid_types:
            raise ValueError(
                f"Invalid value for parameter `type`: {type}. Please choose from one of: {valid_types}"
            )
        self.type = type
        self.file_count = file_count
        if file_count == "directory" and file_types is not None:
            warnings.warn(
                "The `file_types` parameter is ignored when `file_count` is 'directory'."
            )
        if file_types is not None and not isinstance(file_types, list):
            raise ValueError(
                f"Parameter file_types must be a list. Received {file_types.__class__.__name__}"
            )
        if self.file_count in ["multiple", "directory"]:
            self.data_model = ListFiles
        else:
            self.data_model = FileData
        self.size = size
        self.file_types = file_types
        self.label = label
        self.variant = variant
        super().__init__(
            label=label,
            every=every,
            visible=visible,
            elem_id=elem_id,
            elem_classes=elem_classes,
            render=render,
            key=key,
            value=value,
            scale=scale,
            min_width=min_width,
            interactive=interactive,
        )
        self.icon = self.serve_static_file(icon)

    def api_info(self) -> dict[str, list[str]]:
        if self.file_count == "single":
            return FileData.model_json_schema()
        else:
            return ListFiles.model_json_schema()

    def example_payload(self) -> Any:
        if self.file_count == "single":
            return handle_file(
                "https://github.com/gradio-app/gradio/raw/main/test/test_files/sample_file.pdf"
            )
        else:
            return [
                handle_file(
                    "https://github.com/gradio-app/gradio/raw/main/test/test_files/sample_file.pdf"
                )
            ]

    def example_value(self) -> Any:
        if self.file_count == "single":
            return "https://github.com/gradio-app/gradio/raw/main/test/test_files/sample_file.pdf"
        else:
            return [
                "https://github.com/gradio-app/gradio/raw/main/test/test_files/sample_file.pdf"
            ]

    def _process_single_file(self, f: FileData) -> bytes | NamedString:
        file_name = f.path
        if self.type == "filepath":
            file = tempfile.NamedTemporaryFile(delete=False, dir=self.GRADIO_CACHE)
            file.name = file_name
            return NamedString(file_name)
        elif self.type == "binary":
            with open(file_name, "rb") as file_data:
                return file_data.read()
        else:
            raise ValueError(
                "Unknown type: "
                + str(type)
                + ". Please choose from: 'filepath', 'binary'."
            )

    def preprocess(
        self, payload: ListFiles | FileData | None
    ) -> bytes | str | list[bytes] | list[str] | None:
        """
        Parameters:
            payload: File information as a FileData object, or a list of FileData objects.
        Returns:
            Passes the file as a `str` or `bytes` object, or a list of `str` or list of `bytes` objects, depending on `type` and `file_count`.
        """
        if payload is None:
            return None

        if self.file_count == "single":
            if isinstance(payload, ListFiles):
                return self._process_single_file(payload[0])
            return self._process_single_file(payload)

        if isinstance(payload, ListFiles):
            return [self._process_single_file(f) for f in payload]  # type: ignore
        return [self._process_single_file(payload)]  # type: ignore

    def _download_files(self, value: str | list[str]) -> str | list[str]:
        downloaded_files = []
        if isinstance(value, list):
            for file in value:
                if client_utils.is_http_url_like(file):
                    downloaded_file = processing_utils.save_url_to_cache(
                        file, self.GRADIO_CACHE
                    )
                    downloaded_files.append(downloaded_file)
                else:
                    downloaded_files.append(file)
            return downloaded_files
        if client_utils.is_http_url_like(value):
            downloaded_file = processing_utils.save_url_to_cache(
                value, self.GRADIO_CACHE
            )
            return downloaded_file
        else:
            return value

    def postprocess(self, value: str | list[str] | None) -> ListFiles | FileData | None:
        """
        Parameters:
            value: Expects a `str` filepath or URL, or a `list[str]` of filepaths/URLs.
        Returns:
            File information as a FileData object, or a list of FileData objects.
        """
        if value is None:
            return None
        value = self._download_files(value)
        if isinstance(value, list):
            return ListFiles(
                root=[
                    FileData(
                        path=file,
                        orig_name=Path(file).name,
                        size=Path(file).stat().st_size,
                    )
                    for file in value
                ]
            )
        else:
            return FileData(
                path=value,
                orig_name=Path(value).name,
                size=Path(value).stat().st_size,
            )

    @property
    def skip_api(self):
        return False
