import { init, reconcile, reconcileWithHistory } from "./index";
import * as fs from "fs";

describe("reconcile", () => {
    it("tries calling functions without init", () => {
        expect(() => reconcile("Hello", "Hello world", "Hi world")).toThrow(
            /call init()/
        );

        expect(() =>
            reconcileWithHistory("Hello", "Hello world", "Hi world")
        ).toThrow(/call init()/);
    });

    it("call reconcile without cursors", async () => {
        await initWasm();

        expect(reconcile("Hello", "Hello world", "Hi world").text).toEqual(
            "Hi world"
        );
    });

    it("call reconcile with cursors", async () => {
        await initWasm();

        const result = reconcile(
            "Hello",
            {
                text: "Hello world",
                cursors: [
                    {
                        id: 3,
                        position: 2,
                    },
                ],
            },
            {
                text: "Hi world",
                cursors: [
                    {
                        id: 4,
                        position: 0,
                    },
                    { id: 5, position: 3 },
                ],
            }
        );

        expect(result.text).toEqual("Hi world");
        expect(result.cursors).toEqual([
            { id: 3, position: 0 },
            { id: 4, position: 0 },
            { id: 5, position: 3 },
        ]);
    });

    it("call reconcileWithHistory", async () => {
        await initWasm();

        const result = reconcileWithHistory("Hello", "Hello world", "Hi world");

        expect(result.text).toEqual("Hi world");
        expect(result.history.length).toBeGreaterThan(0);
    });
});

async function initWasm() {
    const wasmBin = fs.readFileSync("../pkg/reconcile_bg.wasm");
    await init({ module_or_path: wasmBin });
}