// tslint:disable: no-unused-expression
import { ShortChannelId } from "@node-lightning/core";
import { expect } from "chai";
import { Channel } from "../lib/channel";
import { Graph } from "../lib/graph";
import { Node } from "../lib/node";

describe("Graph", () => {
    let g: Graph;
    let n1: Node;
    let n2: Node;
    let c: Channel;

    beforeEach(() => {
        g = new Graph();

        n1 = new Node();
        n1.nodeId = Buffer.alloc(32);
        n1.nodeId.writeInt8(1, 0);

        n2 = new Node();
        n2.nodeId = Buffer.alloc(32);
        n2.nodeId.writeInt8(2, 0);

        c = new Channel();
        c.shortChannelId = new ShortChannelId(600000, 1, 0);
        c.nodeId1 = n1.nodeId;
        c.nodeId2 = n2.nodeId;
    });

    describe(".addNode", () => {
        it("should add the node", () => {
            g.addNode(n1);
            expect(g.nodes.size).to.equal(1);
            expect(g.nodes.get(n1.nodeId.toString("hex"))).to.equal(n1);
        });
    });

    describe(".addChannel", () => {
        it("should throw when node1 doesnt exist", () => {
            g.addNode(n2);
            expect(() => g.addChannel(c)).to.throw();
        });

        it("should throw when node2 doesnt exist", () => {
            g.addNode(n1);
            expect(() => g.addChannel(c)).to.throw();
        });

        it("should add the channel", () => {
            g.addNode(n1);
            g.addNode(n2);
            g.addChannel(c);
            expect(g.channels.size).to.equal(1);
            expect(g.channels.get(c.shortChannelId.toNumber())).to.equal(c);
        });

        it("should add link for node1", () => {
            g.addNode(n1);
            g.addNode(n2);
            g.addChannel(c);
            expect(n1.channels.size).to.equal(1);
            expect(n1.channels.get(c.shortChannelId.toNumber())).to.equal(c);
        });

        it("should add link for node2", () => {
            g.addNode(n1);
            g.addNode(n2);
            g.addChannel(c);
            expect(n2.channels.size).to.equal(1);
            expect(n2.channels.get(c.shortChannelId.toNumber())).to.equal(c);
        });
    });

    describe(".getNode", () => {
        it("should return node when it exists", () => {
            g.addNode(n1);
            const r = g.getNode(n1.nodeId);
            expect(r).to.equal(n1);
        });

        it("should return undefined when node doesnt exist", () => {
            const r = g.getNode(n1.nodeId);
            expect(r).to.be.undefined;
        });
    });

    describe(".getChannel", () => {
        it("should return the channel", () => {
            g.addNode(n1);
            g.addNode(n2);
            g.addChannel(c);

            const r = g.getChannel(c.shortChannelId);
            expect(r).to.equal(c);
        });

        it("should return undefined when channel not found", () => {
            const r = g.getChannel(c.shortChannelId);
            expect(r).to.be.undefined;
        });
    });

    describe(".removeChannel", () => {
        describe("when channel exists", () => {
            beforeEach(() => {
                g.addNode(n1);
                g.addNode(n2);
                g.addChannel(c);
                g.removeChannel(c);
            });

            it("should remove the channel", () => {
                const r = g.getChannel(c.shortChannelId);
                expect(r).to.be.undefined;
            });

            it("should remove the channel for node1", () => {
                const r = n1.channels.get(c.shortChannelId.toNumber());
                expect(r).to.be.undefined;
            });

            it("should remove the channel for node2", () => {
                const r = n2.channels.get(c.shortChannelId.toNumber());
                expect(r).to.be.undefined;
            });
        });
    });
});