import { expect, test } from "bun:test";
import { resolveDocumentVariables, type BlockDocument } from "@wrnexus/blocks";
import { renderEmail } from "../src/index.ts";

const document: BlockDocument = {
  schemaVersion: 1, kind: "email", meta: { subject: "Hi {{recipientName|friend}}", lang: "en" },
  theme: { tokens: {} },
  root: { id: "root", type: "layout.email-document", version: 1, props: {}, styles: {}, slots: {
    content: [{ id: "text", type: "content.text", version: 1, props: { text: "Hello {{recipientName|friend}}" }, styles: {}, slots: {} }],
  } },
};

test("template rendering preserves fallback tokens rather than baking in sample or fallback values", async () => {
  const before = structuredClone(document);
  const rendered = await renderEmail(document, { preserveVariables: true, mjml: true, variables: { recipientName: "Preview only" } });
  expect(rendered.ok).toBe(true);
  if (!rendered.ok) return;
  expect(rendered.value.subject).toBe("Hi {{recipientName|friend}}");
  expect(rendered.value.parts.html.content).toContain("Hello {{recipientName|friend}}");
  expect(rendered.value.parts.text.content).toContain("Hello {{recipientName|friend}}");
  expect(rendered.value.exports?.mjml).toContain("Hello {{recipientName|friend}}");
  expect(document).toEqual(before);
  const resolved = await renderEmail(document, { variables: { recipientName: "Ada" }, requireVariables: true });
  expect(resolved.ok && resolved.value.subject).toBe("Hi Ada");
});

test("preservation still validates token allowlists and cannot masquerade as resolved delivery", () => {
  const unknown = structuredClone(document);
  unknown.meta.subject = "{{unregistered}}";
  expect(resolveDocumentVariables(unknown, { recipientName: "string" }, {}, { preserveTokens: true }).ok).toBe(false);
  expect(resolveDocumentVariables(document, { recipientName: "string" }, {}, { preserveTokens: true, requireValues: true }).ok).toBe(false);
});