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" }]);
});