import test from "node:test";
import assert from "node:assert/strict";
import {createMigrationContext, migrationObjectId} from "../dist/migration.js";
test("migration context offers restricted ports and deterministic helper identities", () => {
  const input = {schemaVersion: 1, executionId: "operation:transition", exportId: "migrate", ports: [
    {name: "old", binding: "slot:name", view: "old", access: ["read"], states: [{objectId: "obj:one", value: "Alice"}]},
    {name: "new", binding: "slot:name", view: "new", access: ["write"]}, {name: "newRead", binding: "slot:name", view: "new", access: ["read"]},
    {name: "helpers", binding: "atom:helper", view: "new", access: ["create"]},
  ]};
  const {context, result} = createMigrationContext(input);
  assert.equal(context.read("old", "obj:one"), "Alice");
  assert.throws(() => context.write("old", "obj:one", "Bob"), /does not grant/);
  assert.throws(() => context.read("new", "obj:one"), /does not grant/);
  context.write("new", "obj:one", "Alice");
  assert.equal(context.read("newRead", "obj:one"), "Alice");
  context.write("new", "obj:one", "Bob");
  assert.equal(context.read("newRead", "obj:one"), "Bob");
  assert.equal(context.read("old", "obj:one"), "Alice");
  const helper = context.create("helpers", "one");
  assert.equal(helper, migrationObjectId(input.executionId, "helpers", "one"));
  assert.equal(context.create("helpers", "one"), helper);
  assert.equal(result().creates.length, 1);
  assert.deepEqual(input.ports[0].states, [{objectId: "obj:one", value: "Alice"}]);
});