import gradio as gr
from sentence_transformers import CrossEncoder

# Load the reranker model
model = CrossEncoder("jinaai/jina-reranker-v2-base-multilingual", trust_remote_code=True)

# Function to rerank documents
def rerank(query, documents):
    documents = documents.split("\n")  # Split input into a list
    scores = model.predict([[query, doc] for doc in documents if doc.strip()])
    ranked_docs = sorted(zip(documents, scores), key=lambda x: x[1], reverse=True)
    return [{"document": doc, "score": round(score, 4)} for doc, score in ranked_docs]

# Gradio Interface
iface = gr.Interface(
    fn=rerank,
    inputs=["text", gr.Textbox(label="Documents (One per line)", lines=5, placeholder="Enter one document per line")], 
    outputs="json",
    title="JinaAI v2 Reranker API",
    description="Enter a query and a list of documents. The model will rank them based on relevance.",
)

iface.launch()