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import { describe, expect, test } from "bun:test"
import { createRoot, createSignal } from "solid-js"
import { createSessionKeyReader, ensureSessionKey, pruneSessionKeys } from "./layout"
describe("layout session-key helpers", () => {
test("couples touch and scroll seed in order", () => {
const calls: string[] = []
const result = ensureSessionKey(
"dir/a",
(key) => calls.push(`touch:${key}`),
(key) => calls.push(`seed:${key}`),
)
expect(result).toBe("dir/a")
expect(calls).toEqual(["touch:dir/a", "seed:dir/a"])
})
test("reads dynamic accessor keys lazily", () => {
const seen: string[] = []
createRoot((dispose) => {
const [key, setKey] = createSignal("dir/one")
const read = createSessionKeyReader(key, (value) => seen.push(value))
expect(read()).toBe("dir/one")
setKey("dir/two")
expect(read()).toBe("dir/two")
dispose()
})
expect(seen).toEqual(["dir/one", "dir/two"])
})
})
describe("pruneSessionKeys", () => {
test("keeps active key and drops lowest-used keys", () => {
const drop = pruneSessionKeys({
keep: "k4",
max: 3,
used: new Map([
["k1", 1],
["k2", 2],
["k3", 3],
["k4", 4],
]),
view: ["k1", "k2", "k4"],
tabs: ["k1", "k3", "k4"],
})
expect(drop).toEqual(["k1"])
expect(drop.includes("k4")).toBe(false)
})
test("does not prune without keep key", () => {
const drop = pruneSessionKeys({
keep: undefined,
max: 1,
used: new Map([
["k1", 1],
["k2", 2],
]),
view: ["k1"],
tabs: ["k2"],
})
expect(drop).toEqual([])
})
})
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