import assert from "node:assert/strict";
import test from "node:test";

import {
  chartLibraryFromCloudOthers,
  chartLibrarySessionBranch,
  keepLocalChartLibraryOnCloudFailure,
} from "../src/lib/chart-library-session.ts";

type RecordShape = { id: string; role: "self" | "other" };

function upsertSelf(library: RecordShape[], profile: unknown): RecordShape[] {
  const others = library.filter((record) => record.role !== "self");
  if (!profile) return others;
  return [{ id: "self", role: "self" }, ...others];
}

test("clearing the account empties the chart library session", () => {
  assert.equal(chartLibrarySessionBranch(null, "acct-1"), "clear");
  assert.equal(chartLibrarySessionBranch("", "acct-1"), "clear");
});

test("switching accounts hydrates local then cloud instead of writing the previous library", () => {
  assert.equal(chartLibrarySessionBranch("acct-2", "acct-1"), "hydrate-then-persist");
});

test("a later profile change on the same account still upserts self", () => {
  assert.equal(chartLibrarySessionBranch("acct-1", "acct-1"), "persist-self");
  const current: RecordShape[] = [{ id: "other-1", role: "other" }];
  assert.deepEqual(upsertSelf(current, { name: "self" }), [
    { id: "self", role: "self" },
    { id: "other-1", role: "other" },
  ]);
});

test("a successful cloud read keeps only non-self records before upserting self", () => {
  const cloud: RecordShape[] = [
    { id: "stale-self", role: "self" },
    { id: "other-1", role: "other" },
  ];
  assert.deepEqual(chartLibraryFromCloudOthers(cloud, { name: "self" }, upsertSelf), [
    { id: "self", role: "self" },
    { id: "other-1", role: "other" },
  ]);
});

test("a failed cloud read leaves the local library in place", () => {
  const local: RecordShape[] = [{ id: "self", role: "self" }, { id: "other-1", role: "other" }];
  assert.equal(keepLocalChartLibraryOnCloudFailure(local), local);
});