"""Example to showcase an error with uploading files if one of the files lacks proper permissions.

This used the following dependencies:

trame==3.12.0
trame-client==3.11.3
trame-common==1.1.2
trame-server==3.10.0
trame-vuetify==3.2.1

This example can be ran inside an environment with the above via:

python input-upload-mre.py
"""

from __future__ import annotations


from trame.app import get_server
from trame.decorators import TrameApp
from trame.ui.vuetify3 import SinglePageLayout
from trame.widgets import vuetify3 as v3
from trame.decorators import life_cycle


@TrameApp()
class FileInputUploadExample:
    """Demo app to showcase an error being thrown when uploading a file with insufficient permissions."""

    def __init__(self) -> None:
        self.server = get_server(None)

        self.build_ui()

    def build_ui(self) -> None:
        with SinglePageLayout(self.server) as layout:
            with layout.content:
                v3.VFileInput(
                    multiple=True,
                    model_value=("uploaded_files", []),
                    update_modelValue=(self.on_upload_complete, "[$event]"),
                )

    @life_cycle.error
    def on_error(self, message: str) -> None:
        print(f"A JS error occured: {message}")

    def on_upload_complete(
        self, uploaded_files: list[dict[str, str | int | None]]
    ) -> None:
        """A callback normally fired when the upload is complete.

        This will fire if the files have proper permissions, but will not if one of
        the files lacks read permissions for the uploading user. This can be observed
        by seeing a JS Error thrown in the Web console.
        """
        errored_files: list[dict[str, str | int | None]] = []
        successful_files: list[dict[str, str | int | None]] = []

        for uploaded_file in uploaded_files:
            if uploaded_file["error"] is not None:
                errored_files.append(uploaded_file)
            else:
                successful_files.append(uploaded_file)

        print(
            "The following files were uploaded successfully:",
            [file["name"] for file in successful_files],
        )
        print(
            "The following files had errors while uploading:",
            [file["name"] for file in errored_files],
        )

        self.server.state.uploaded_files = successful_files


if __name__ == "__main__":
    app = FileInputUploadExample()
    app.server.start()