"""Gradio app to showcase the language detector."""

import gradio as gr
from transformers import pipeline


# Get transformer model and set up a pipeline
model_ckpt = "papluca/xlm-roberta-base-language-detection"
pipe = pipeline("text-classification", model=model_ckpt)


def predict(text: str) -> dict:
    """Compute predictions for text."""
    preds = pipe(text, return_all_scores=True, truncation=True, max_length=128)
    if preds:
        pred = preds[0]
        return {p["label"]: float(p["score"]) for p in pred}
    else:
        return None


title = "Language detection with XLM-RoBERTa"
description = "Determine the language in which your text is written."
examples = [
    ["Better late than never."],
    ["Tutto è bene ciò che finisce bene."],
    ["Donde hay humo, hay fuego."],
]
explanation = "Supported languages are (20): arabic (ar), bulgarian (bg), german (de), modern greek (el), english (en), spanish (es), french (fr), hindi (hi), italian (it), japanese (ja), dutch (nl), polish (pl), portuguese (pt), russian (ru), swahili (sw), thai (th), turkish (tr), urdu (ur), vietnamese (vi), and chinese (zh)."

app = gr.Interface(
    fn=predict,
    inputs=gr.inputs.Textbox(
        placeholder="What's the text you want to know the language for?",
        label="Text",
        lines=3,
    ),
    outputs=gr.outputs.Label(num_top_classes=3, label="Your text is written in "),
    title=title,
    description=description,
    examples=examples,
    article=explanation,
)

app.launch()