import { Atom } from "@thi.ng/atom";
import * as rs from "@thi.ng/rstream";
import * as rsg from "@thi.ng/rstream-graph";

// (optional) state atom to source value change streams from
const state = new Atom({a: 1, b: 2});

// graph declaration / definition
const graph = rsg.initGraph(state, {
    // this node sources both of its inputs
    // from values in the state atom
    add: {
        fn: rsg.add,
        ins: [
            { path: "a" },
            { path: "b" }
        ],
    },
    // this node receives values from the `add` node
    // and the given iterable
    mul: {
        fn: rsg.mul,
        ins: [
            { stream: "add" },
            { stream: () => rs.fromIterable([10, 20, 30]) }
        ],
    }
});

// (optional) subscribe to individual nodes
graph.mul.subscribe({
    next: (x) => console.log("result:", x)
});

// result: 30
// result: 60
// result: 90

// changes in subscribed atom values flow through the graph
state.resetIn("a", 10);
// result: 360