import { describe, expect, it } from "vitest";
import { searchChapters, splitHighlight } from "../src/lib/search";
import { splitChapters } from "../src/lib/chapters";

const TEXT = ["第一章 起风", "风来了又走。", "第二章 落雨", "雨点敲窗，风声相伴。", "风止"].join("\n");

describe("searchChapters", () => {
  const chs = splitChapters(TEXT);
  it("finds case-insensitive hits with chapter index and position", () => {
    const hits = searchChapters(TEXT, chs, "风");
    expect(hits.length).toBeGreaterThanOrEqual(3);
    expect(hits[0].ch).toBe(0);
    expect(hits.every((h) => h.snippet.includes("风"))).toBe(true);
  });
  it("returns empty for no match / empty query", () => {
    expect(searchChapters(TEXT, chs, "不存在")).toEqual([]);
    expect(searchChapters(TEXT, chs, "  ")).toEqual([]);
  });
  it("caps at limit", () => {
    expect(searchChapters(TEXT, chs, "风", 2)).toHaveLength(2);
  });
});

describe("splitHighlight", () => {
  it("splits snippet into before/match/after", () => {
    expect(splitHighlight("abc风def", 3, 1)).toEqual({ before: "abc", match: "风", after: "def" });
  });
});