import { describe, expect, test } from "bun:test"
import { canDisposeDirectory, pickDirectoriesToEvict } from "./global-sync/eviction"

describe("pickDirectoriesToEvict", () => {
  test("keeps pinned stores and evicts idle stores", () => {
    const now = 5_000
    const picks = pickDirectoriesToEvict({
      stores: ["a", "b", "c", "d"],
      state: new Map([
        ["a", { lastAccessAt: 1_000 }],
        ["b", { lastAccessAt: 4_900 }],
        ["c", { lastAccessAt: 4_800 }],
        ["d", { lastAccessAt: 3_000 }],
      ]),
      pins: new Set(["a"]),
      max: 2,
      ttl: 1_500,
      now,
    })

    expect(picks).toEqual(["d", "c"])
  })
})

describe("canDisposeDirectory", () => {
  test("rejects pinned or inflight directories", () => {
    expect(
      canDisposeDirectory({
        directory: "dir",
        hasStore: true,
        pinned: true,
        booting: false,
        loadingSessions: false,
      }),
    ).toBe(false)
    expect(
      canDisposeDirectory({
        directory: "dir",
        hasStore: true,
        pinned: false,
        booting: true,
        loadingSessions: false,
      }),
    ).toBe(false)
    expect(
      canDisposeDirectory({
        directory: "dir",
        hasStore: true,
        pinned: false,
        booting: false,
        loadingSessions: true,
      }),
    ).toBe(false)
  })

  test("accepts idle unpinned directory store", () => {
    expect(
      canDisposeDirectory({
        directory: "dir",
        hasStore: true,
        pinned: false,
        booting: false,
        loadingSessions: false,
      }),
    ).toBe(true)
  })
})