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

const text = (id: string): BlockNode => ({ id, type: "content.text", version: 1, props: { text: id }, styles: {}, slots: {} });
const columns = (id: string): BlockNode => ({ id, type: "layout.columns", version: 1, props: {}, styles: {}, slots: { columns: [0, 1].map(index => ({ id: `${id}-${index}`, type: "layout.column", version: 1, props: { width: "50%" }, styles: {}, slots: { content: [text(`${id}-text-${index}`)] } })) } });

test("invalid nested MJML is diagnosed and omitted while HTML and text remain usable", async () => {
  const document: BlockDocument = { schemaVersion: 1, kind: "email", meta: { subject: "Nested", lang: "en" }, theme: { tokens: {} }, root: { id: "root", type: "layout.email-document", version: 1, props: {}, styles: {}, slots: { content: [{ id: "outer", type: "layout.section", version: 1, props: {}, styles: {}, slots: { content: [{ id: "inner", type: "layout.section", version: 1, props: {}, styles: {}, slots: { content: [text("Retained nested content")] } }] } }] } } };
  const rendered = await renderEmail(document, { mjml: true });
  expect(rendered.ok).toBe(true);
  if (!rendered.ok) return;
  expect(rendered.value.exports?.mjml).toBeUndefined();
  expect(rendered.value.warnings.some(warning => warning.code === "mjml.validation")).toBe(true);
  expect(rendered.value.parts.html.content).toContain("Retained nested content");
  expect(rendered.value.parts.text.content).toContain("Retained nested content");
});

test("root content and separate column rows produce valid ordered MJML without changing the document", async () => {
  const document: BlockDocument = { schemaVersion: 1, kind: "email", meta: { subject: "Root blocks", lang: "en" }, theme: { tokens: {} }, root: { id: "root", type: "layout.email-document", version: 1, props: {}, styles: {}, slots: { content: [text("intro"), columns("first"), columns("second"), { id: "cta", type: "content.button", version: 1, props: { label: "Act", href: "https://example.com" }, styles: {}, slots: {} }, text("end")] } } };
  const before = structuredClone(document);
  const rendered = await renderEmail(document, { mjml: true });
  expect(rendered.ok).toBe(true);
  if (!rendered.ok) return;
  const mjml = rendered.value.exports!.mjml!;
  expect(await validateMjml(mjml)).toEqual([]);
  expect(mjml.match(/<mj-section\b/g)).toHaveLength(5);
  expect(mjml.indexOf("intro")).toBeLessThan(mjml.indexOf("first-text-0"));
  expect(mjml.indexOf("first-text-1")).toBeLessThan(mjml.indexOf("second-text-0"));
  expect(mjml.indexOf("second-text-1")).toBeLessThan(mjml.indexOf(">Act<"));
  expect(document).toEqual(before);
});