from fastapi import APIRouter, HTTPException
from pydantic import BaseModel
from config import settings, Settings
from services.load_balancer import lb
from services.multicast_detector import multicast_detector

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


class NodeUpdate(BaseModel):
    weight: int
    enabled: bool | None = None


@router.get("")
async def list_nodes():
    nodes = []
    for n in settings.edge_nodes:
        nodes.append({
            "id": n["id"],
            "name": n["name"],
            "host": n["host"],
            "hls_port": n["hls_port"],
            "api_port": n["api_port"],
            "weight": n["weight"],
            "enabled": n.get("enabled", True),
        })
    return nodes


@router.put("/{node_id}")
async def update_node(node_id: str, body: NodeUpdate):
    found = False
    for n in settings.edge_nodes:
        if n["id"] == node_id:
            n["weight"] = body.weight
            if body.enabled is not None:
                n["enabled"] = body.enabled
            found = True
            break
    if not found:
        raise HTTPException(status_code=404, detail="Node not found")
    return {"ok": True}


@router.get("/strategy")
async def get_strategy():
    return {
        "strategy": settings.load_balance_strategy,
        "multicast_enabled": settings.multicast_enabled,
        "multicast_available": multicast_detector.is_available(),
    }


@router.put("/strategy")
async def update_strategy(strategy: str, multicast_enabled: bool | None = None):
    global settings
    if strategy in ("round-robin", "weighted", "least-conn"):
        settings.load_balance_strategy = strategy
    if multicast_enabled is not None:
        settings.multicast_enabled = multicast_enabled
    return {"ok": True}