import { describe, it, expect } from "vitest";
import { buildFingerprint, resolve } from "../src/anchorer";

const ORIGINAL = "intro\nThe quick brown fox\noutro\n";

describe("re-anchor scenarios (SLICE-4 decision logic)", () => {
  it("reload, document unchanged: resolves to the same range", () => {
    const start = ORIGINAL.indexOf("quick brown");
    const fp = buildFingerprint(ORIGINAL, { start, end: start + "quick brown".length });
    expect(resolve(ORIGINAL, fp)).toEqual({ start, end: start + "quick brown".length });
  });

  it("external edit that moves the anchored text down: re-resolves to the new range", () => {
    const start = ORIGINAL.indexOf("quick brown");
    const fp = buildFingerprint(ORIGINAL, { start, end: start + "quick brown".length });
    const edited = "a new first line\nanother line\n" + ORIGINAL;
    const newStart = edited.indexOf("quick brown");
    expect(newStart).not.toBe(start);
    expect(resolve(edited, fp)).toEqual({ start: newStart, end: newStart + "quick brown".length });
  });

  it("external edit that deletes the anchored text: orphaned, never moved (INV-1)", () => {
    const start = ORIGINAL.indexOf("quick brown");
    const fp = buildFingerprint(ORIGINAL, { start, end: start + "quick brown".length });
    const edited = "intro\nThe lazy dog\noutro\n";
    expect(resolve(edited, fp)).toBe("orphaned");
  });
});