import { describe, expect, it, vi } from "vitest"
import * as Refreshable from "../src/Refreshable.js"


describe("Refreshable", () => {
    it("attaches a cell and notifies subscribers after a compatible update", async () => {
        const first = {}
        const cell = Refreshable.makeCell(first, "hooks", false)
        const listener = vi.fn()

        expect(Refreshable.isRefreshable(first)).toBe(false)
        const attached = Refreshable.attach(first, cell)
        expect(attached).toBe(first)
        expect(Refreshable.isRefreshable(first)).toBe(true)
        expect(attached[Refreshable.RefreshableTypeId]).toBe(cell)

        cell.subscribe(listener)
        const second = {}
        cell.update(second, "hooks", false)

        expect(cell.current).toBe(second)
        expect(cell.snapshot).toEqual({
            revision: 1,
            resetRevision: 0,
        })

        await Promise.resolve()
        expect(listener).toHaveBeenCalledTimes(1)
    })

    it("requests a remount when a signature changes or reset is forced", () => {
        const cell = Refreshable.makeCell({}, "one", false)

        cell.update({}, "two", false)
        expect(cell.snapshot.resetRevision).toBe(1)

        cell.update({}, "two", true)
        expect(cell.snapshot.resetRevision).toBe(2)
    })
})