import assert from "node:assert";
import { describe, it } from "node:test";
import { fuzzyFilter, fuzzyMatch } from "../src/fuzzy.js";

describe("fuzzyMatch", () => {
  it("empty query matches everything with score 0", () => {
    const result = fuzzyMatch("", "anything");
    assert.strictEqual(result.matches, true);
    assert.strictEqual(result.score, 0);
  });

  it("query longer than text does not match", () => {
    const result = fuzzyMatch("longquery", "short");
    assert.strictEqual(result.matches, false);
  });

  it("exact match has good score", () => {
    const result = fuzzyMatch("test", "test");
    assert.strictEqual(result.matches, true);
    assert.ok(result.score < 0); // Should be negative due to consecutive bonuses
  });

  it("characters must appear in order", () => {
    const matchInOrder = fuzzyMatch("abc", "aXbXc");
    assert.strictEqual(matchInOrder.matches, true);

    const matchOutOfOrder = fuzzyMatch("abc", "cba");
    assert.strictEqual(matchOutOfOrder.matches, false);
  });

  it("case insensitive matching", () => {
    const result = fuzzyMatch("ABC", "abc");
    assert.strictEqual(result.matches, true);

    const result2 = fuzzyMatch("abc", "ABC");
    assert.strictEqual(result2.matches, true);
  });

  it("consecutive matches score better than scattered matches", () => {
    const consecutive = fuzzyMatch("foo", "foobar");
    const scattered = fuzzyMatch("foo", "f_o_o_bar");

    assert.strictEqual(consecutive.matches, true);
    assert.strictEqual(scattered.matches, true);
    assert.ok(consecutive.score < scattered.score);
  });

  it("word boundary matches score better", () => {
    const atBoundary = fuzzyMatch("fb", "foo-bar");
    const notAtBoundary = fuzzyMatch("fb", "afbx");

    assert.strictEqual(atBoundary.matches, true);
    assert.strictEqual(notAtBoundary.matches, true);
    assert.ok(atBoundary.score < notAtBoundary.score);
  });

  it("matches swapped alpha numeric tokens", () => {
    const result = fuzzyMatch("codex52", "gpt-5.2-codex");
    assert.strictEqual(result.matches, true);
  });
});

describe("fuzzyFilter", () => {
  it("empty query returns all items unchanged", () => {
    const items = ["apple", "banana", "cherry"];
    const result = fuzzyFilter(items, "", (x: string) => x);
    assert.deepStrictEqual(result, items);
  });

  it("filters out non-matching items", () => {
    const items = ["apple", "banana", "cherry"];
    const result = fuzzyFilter(items, "an", (x: string) => x);
    assert.ok(result.includes("banana"));
    assert.ok(!result.includes("apple"));
    assert.ok(!result.includes("cherry"));
  });

  it("sorts results by match quality", () => {
    const items = ["a_p_p", "app", "application"];
    const result = fuzzyFilter(items, "app", (x: string) => x);

    // "app" should be first (exact consecutive match at start)
    assert.strictEqual(result[0], "app");
  });

  it("works with custom getText function", () => {
    const items = [
      { name: "foo", id: 1 },
      { name: "bar", id: 2 },
      { name: "foobar", id: 3 },
    ];
    const result = fuzzyFilter(
      items,
      "foo",
      (item: { name: string; id: number }) => item.name,
    );

    assert.strictEqual(result.length, 2);
    assert.ok(result.map((r) => r.name).includes("foo"));
    assert.ok(result.map((r) => r.name).includes("foobar"));
  });
});
