import { describe, expect, test } from "vitest";

import {
  isTemplateLike,
  pickTemplateExport,
} from "../../src/utils/pick-template-export.js";

const sampleTemplate = {
  $schema: "https://libauth.org/schemas/wallet-template-v0.schema.json",
  name: "Sample",
  roles: { owner: { name: "Owner" } },
};

describe("pickTemplateExport", () => {
  test("isTemplateLike accepts objects with schema, name, and roles", () => {
    expect(isTemplateLike(sampleTemplate)).toBe(true);
    expect(isTemplateLike(null)).toBe(false);
    expect(isTemplateLike({ name: "Missing schema" })).toBe(false);
  });

  test("prefers default export when template-like", () => {
    const picked = pickTemplateExport({
      default: sampleTemplate,
      otherTemplate: {
        ...sampleTemplate,
        name: "Other",
      },
    });

    expect(picked).toBe(sampleTemplate);
  });

  test("uses a single named export when no default export exists", () => {
    const picked = pickTemplateExport({
      p2pkhTemplate: sampleTemplate,
    });

    expect(picked).toBe(sampleTemplate);
  });

  test("throws when multiple template exports exist", () => {
    expect(() =>
      pickTemplateExport({
        firstTemplate: sampleTemplate,
        secondTemplate: { ...sampleTemplate, name: "Second" },
      }),
    ).toThrow(/Multiple template exports found/);
  });

  test("throws when no template export exists", () => {
    expect(() =>
      pickTemplateExport({
        notATemplate: { foo: "bar" },
      }),
    ).toThrow(/No XOTemplate export found/);
  });
});