# Graph view component
# File: components/graph_view.py
import streamlit as st


def render_graph(graph_data):
    """
    Display a knowledge graph using Streamlit's Graphviz support.
    Args:
        graph_data (dict): {
            'nodes': [{'id': str, 'label': str}],
            'edges': [{'source': str, 'target': str}]
        }
    """
    st.header("🔗 Knowledge Graph")
    if not graph_data or not graph_data.get('nodes'):
        st.info("No graph data to display.")
        return

    # Build DOT string
    dot = "digraph G {\n"
    for node in graph_data['nodes']:
        dot += f"    {node['id']} [label=\"{node['label']}\"];\n"
    for edge in graph_data['edges']:
        dot += f"    {edge['source']} -> {edge['target']};\n"
    dot += "}"

    st.graphviz_chart(dot)