import PrefetchAndCache, {shortKey} from "../../../../src/background/completion/impl/PrefetchAndCache";
import { expect } from 'chai';

class MockRepository {
  public history: string[] = [];

  constructor(
    private items: string[],
  ) {
  }

  get(query: string): Promise<string[]> {
    this.history.push(query);
    if (query.length === 0) {
      return Promise.resolve(this.items);
    } else {
      return Promise.resolve(this.items.filter(item => item.includes(query)));
    }
  }
}
const filter = (items: string[], query: string) => query.length === 0 ? items : items.filter(item => item.includes(query));

describe('shortKey', () => {
  it('returns query excluding the last word', () => {
      const query = "hello\t world    good bye";
      const shorten = shortKey(query);
      expect(shorten).to.equal("hello world good")
  });

  it('returns half-length of the query', () => {
    const query = "the-query-with-super-long-word";
    const shorten = shortKey(query);
    expect(shorten).to.equal("the-query-with-")
  });

  it('returns shorten URL', () => {
    let query = "https://example.com/path/to/resource?q=hello";
    let shorten = shortKey(query);
    expect(shorten).to.equal("https://example.com/path/to/");

    query = "https://example.com/path/to/resource/#id1";
    shorten = shortKey(query);
    expect(shorten).to.equal("https://example.com/path/to/");

    query = "https://www.google.c";
    shorten = shortKey(query);
    expect(shorten).to.equal("https://ww");
  })
});

describe('PrefetchAndCache', () => {
  describe('get', () => {
    it('returns cached request', async() => {
      const repo = new MockRepository(["apple", "apple pie", "apple juice", "banana", "banana pudding", "cherry"]);
      const sut = new PrefetchAndCache(repo.get.bind(repo), filter);

      expect(await sut.get("apple pie")).deep.equal(["apple pie"]);
      expect(await sut.get("apple ")).deep.equal(["apple", "apple pie", "apple juice"]);
      expect(await sut.get("apple")).deep.equal(["apple", "apple pie", "apple juice"]);
      expect(await sut.get("appl")).deep.equal(["apple", "apple pie", "apple juice"]);
      expect(repo.history).to.deep.equal(["apple", 'ap']);

      expect(await sut.get("banana")).deep.equal(["banana", "banana pudding"]);
      expect(repo.history).to.deep.equal(["apple", "ap", "ban"]);
      expect(await sut.get("banana p")).deep.equal(["banana pudding"]);
      expect(repo.history).to.deep.equal(["apple", "ap", "ban", "banana"]);
      expect(await sut.get("ba")).deep.equal(["banana", "banana pudding"]);
      expect(repo.history).to.deep.equal(["apple", "ap", "ban", "banana", "b"]);

      expect(await sut.get("")).to.have.lengthOf(6);
      expect(repo.history).to.deep.equal(["apple", "ap", "ban", "banana", "b", ""]);
    });
  });
});