"""
Timeline API — REST endpoints over the TimelineStore journal.
"""

from fastapi import APIRouter

from backend.analysis.timeline_store import STORE as TIMELINE_STORE

router = APIRouter(prefix="/timeline", tags=["timeline"])


# -----------------------------
# GET NODE TIMELINE
# -----------------------------
@router.get("/{node}")
def get_node_timeline(node: str):
    return {
        "node": node,
        "events": TIMELINE_STORE.get_node_events(node),
    }


# -----------------------------
# REWIND SNAPSHOT
# -----------------------------
@router.get("/rewind/{index}")
def rewind(index: int):
    return {
        "index": index,
        "snapshot": TIMELINE_STORE.snapshot_at(index),
    }


# -----------------------------
# STATS
# -----------------------------
@router.get("/stats/summary")
def stats():
    return TIMELINE_STORE.stats()


# -----------------------------
# Legacy wrapper for api.py facade
# -----------------------------
def timeline_endpoint(session_id):
    """Legacy — return all events for a session id (or live journal if not found)."""
    return {
        "session_id": session_id,
        "events": TIMELINE_STORE.all(),
    }