import html as _html
import json, pathlib
from astranexus.core.schema import CanvasGraph

_TEMPLATE = pathlib.Path(__file__).resolve().parents[1] / "assets" / "vis_canvas.html"


def render_html(g: CanvasGraph) -> str:
    payload = {
        "nodes": [n.__dict__ for n in g.nodes],
        "edges": [{"src": e.src, "dst": e.dst, "kind": e.kind} for e in g.edges],
        "clusters": [{"id": c.id, "name": c.name, "count": len(c.email_ids),
                      "rationale": c.rationale, "urgency": c.urgency}
                     for c in g.clusters],
    }
    template = _TEMPLATE.read_text(encoding="utf-8")
    return template.replace("__GRAPH_JSON__", json.dumps(payload))


def render_iframe(g: CanvasGraph, height: int = 620) -> str:
    """Wrap the canvas doc in an <iframe srcdoc> so its <script> runs.

    gr.HTML (Gradio 6) injects via innerHTML and does NOT execute inline
    <script>; an iframe is a separate document that does. The vis-network
    template already targets window.parent, so it was built for this.
    """
    srcdoc = _html.escape(render_html(g), quote=True)
    return (f'<iframe srcdoc="{srcdoc}" '
            f'style="width:100%;height:{height}px;border:0;background:#0a0e17" '
            f'sandbox="allow-scripts"></iframe>')