"""
Graph event emission — node state tracking + SSE graph_update events.
"""

from __future__ import annotations

from core.detect import emit
from core.detect.state import DetectState


# Track node states across pipeline runs
_node_states: dict[str, dict[str, str]] = {}


def emit_transition(state: DetectState, node: str, status: str, node_list: list[str]):
    """Update node status and emit graph_update SSE event."""
    job_id = state.get("job_id")
    if not job_id:
        return

    if job_id not in _node_states:
        _node_states[job_id] = {n: "pending" for n in node_list}

    _node_states[job_id][node] = status

    nodes = [{"id": n, "status": _node_states[job_id][n]} for n in node_list]
    emit.graph_update(job_id, nodes)