import { describe, it, expect } from "vitest";
import { extractReplacement } from "../src/liveTurn";

describe("extractReplacement", () => {
  it("returns plain text untouched", () => {
    expect(extractReplacement("Hello world.", "x")).toBe("Hello world.");
  });
  it("strips a wrapping fence", () => {
    expect(extractReplacement("```\nHello world.\n```", "x")).toBe("Hello world.");
  });
  it("strips a language-tagged fence", () => {
    expect(extractReplacement("```markdown\nHello.\n```\n", "x")).toBe("Hello.");
  });
  it("leaves inner fences alone", () => {
    const inner = "before\n```js\ncode\n```\nafter";
    expect(extractReplacement(inner, "x")).toBe(inner);
  });
  it("keeps the fence when the original selection was itself fence-wrapped", () => {
    const sel = "```python\nold()\n```";
    const out = "```python\nnew()\n```";
    expect(extractReplacement(out, sel)).toBe(out);
  });
  it("still strips when the selection was plain but the model added a fence", () => {
    expect(extractReplacement("```\nplain\n```", "plain old text")).toBe("plain");
  });
});