import streamlit as st

def render_sidebar():
    """
    Sidebar with all controls for the research companion app.

    Returns:
        - query (str): The user's main research query.
        - num_results (int): Max number of papers to show.
        - theme (str): 'Light' or 'Dark'.
        - search_clicked (bool): Did user click Search?
        - gemini_prompt (str): Optional Gemini Q&A question.
    """
    st.sidebar.title("🚀 MCP Research Companion")

    # Main research topic input
    query = st.sidebar.text_input(
        label="Enter your research topic:",
        value="",
        placeholder="e.g. CRISPR delivery"
    )

    # Number of results slider
    num_results = st.sidebar.slider(
        label="Max papers to display",
        min_value=1,
        max_value=20,
        value=5
    )

    # Theme toggle
    theme = st.sidebar.selectbox(
        label="Theme",
        options=["Light", "Dark"],
        index=0
    )

    # Gemini question input (for Q&A at any time)
    gemini_prompt = st.sidebar.text_input(
        label="💡 Ask Gemini (about anything!):",
        value="",
        placeholder="e.g. Summarize the latest CRISPR techniques"
    )

    # Search button
    search_clicked = st.sidebar.button("Search")

    return query, num_results, theme, search_clicked, gemini_prompt