import streamlit as st
from utils.api import upload_pdfs


def render_upload_panel() -> None:
    st.markdown("### Documents")

    files = st.file_uploader(
        "Upload medical PDFs",
        type=["pdf"],
        accept_multiple_files=True,
        label_visibility="collapsed",
        help="PDFs are chunked, embedded, and stored in the knowledge base.",
    )

    if files:
        st.caption(f"{len(files)} file(s) selected")

    if st.button("Process & Index", disabled=not files, use_container_width=True):
        with st.spinner(f"Embedding {len(files)} document(s)…"):
            try:
                result = upload_pdfs(files)
                chunks = result.get("chunks_indexed", "?")
                st.success(f"Indexed {chunks} chunks from {len(files)} file(s)")
            except Exception as exc:
                st.error(f"Upload failed: {exc}")