import { describe, expect, test } from "bun:test";
import {
  mergeSectionTranslations,
  transformLocalizedPaths,
} from "./pages";

describe("Page section localization", () => {
  const paths = ["title", "items[].title", "items[].note"];
  const payload = {
    title: { th: "เอกสารอ้างอิง", en: "References" },
    items: [{
      title: { th: "เทคโนโลยีไฟน์แบลงก์", en: "Fine blanking technology" },
      note: { th: "ข้อมูลทางเทคนิค" },
      url: "https://example.com/reference",
    }],
    variant: "numbered",
  };

  test("resolves only the requested language and reports missing nested fields", () => {
    const result = transformLocalizedPaths(payload, paths, "zh", false);

    expect(result.payload).toEqual({
      title: null,
      items: [{
        title: null,
        note: null,
        url: "https://example.com/reference",
      }],
      variant: "numbered",
    });
    expect(result.fallbackPaths).toEqual([
      "title",
      "items[0].title",
      "items[0].note",
    ]);
  });

  test("merges one language while preserving other languages and configuration", () => {
    const result = mergeSectionTranslations(payload, {
      title: "参考资料",
      items: [{
        title: "精密冲裁技术",
        note: "技术资料",
      }],
    }, paths, "zh");

    expect(result.payload).toEqual({
      title: { th: "เอกสารอ้างอิง", en: "References", zh: "参考资料" },
      items: [{
        title: {
          th: "เทคโนโลยีไฟน์แบลงก์",
          en: "Fine blanking technology",
          zh: "精密冲裁技术",
        },
        note: { th: "ข้อมูลทางเทคนิค", zh: "技术资料" },
        url: "https://example.com/reference",
      }],
      variant: "numbered",
    });
    expect(result.translatedPaths).toEqual([
      "title",
      "items[0].title",
      "items[0].note",
    ]);
  });

  test("rejects an array shape that cannot be merged safely", () => {
    expect(() => mergeSectionTranslations(payload, {
      items: [],
    }, paths, "zh")).toThrow("Translation array shape mismatch at items");
  });
});