import assert from "node:assert/strict";
import { describe, it } from "node:test";
import { buildVisionContentParts, textFromMessageContent } from "../../src/lib/llm/content";

describe("llm content helpers", () => {
  it("reads plain string content", () => {
    assert.equal(textFromMessageContent("hello"), "hello");
  });

  it("joins text parts from multimodal content", () => {
    assert.equal(
      textFromMessageContent([
        { type: "text", text: "first" },
        { type: "image_url", image_url: { url: "data:image/png;base64,abc" } },
        { type: "text", text: "second" },
      ]),
      "first\nsecond",
    );
  });

  it("builds vision parts with fallback prompt when text is empty", () => {
    const parts = buildVisionContentParts("", ["data:image/jpeg;base64,abc"]);
    assert.equal(parts.length, 2);
    assert.equal(parts[0]?.type, "text");
    assert.equal(parts[1]?.type, "image_url");
  });
});