import { describe, expect, it } from "vitest";
import type { Product } from "@/lib/types";
import {
  defaultSearchFilterState,
  filterAndSortSearchProducts,
  normalizePriceInput,
  parseTripDays,
} from "@/lib/searchFilters";

function createProduct(id: number, title: string, price: string): Product {
  return {
    id,
    title,
    price,
    tags: [],
    image: `/assets/test-${id}.jpg`,
  };
}

describe("search filter helpers", () => {
  const products = [
    createProduct(1, "贵州黄果树 7天6晚精品小包团", "57500"),
    createProduct(2, "荔波小七孔 15天及以上深度旅行", "112500"),
    createProduct(3, "西江苗寨 4日轻松游", "36000"),
    createProduct(4, "贵州定制旅行方案", "98000"),
  ];

  it("parses trip days from route titles", () => {
    expect(parseTripDays("贵州黄果树 7天6晚精品小包团")).toBe(7);
    expect(parseTripDays("西江苗寨 4日轻松游")).toBe(4);
    expect(parseTripDays("贵州定制旅行方案")).toBeNull();
  });

  it("normalizes price input values", () => {
    expect(normalizePriceInput(" 57500 ")).toBe(57500);
    expect(normalizePriceInput("")).toBeNull();
    expect(normalizePriceInput("abc")).toBeNull();
  });

  it("filters products by applied price range", () => {
    const results = filterAndSortSearchProducts(products, {
      ...defaultSearchFilterState,
      priceMin: 50000,
      priceMax: 100000,
    });

    expect(results.map((product) => product.id)).toEqual([1, 4]);
  });

  it("treats reversed price bounds as the same numeric range", () => {
    const results = filterAndSortSearchProducts(products, {
      ...defaultSearchFilterState,
      priceMin: 100000,
      priceMax: 50000,
    });

    expect(results.map((product) => product.id)).toEqual([1, 4]);
  });

  it("sorts by price ascending and descending", () => {
    const lowToHigh = filterAndSortSearchProducts(products, {
      ...defaultSearchFilterState,
      sortKey: "priceAsc",
    });
    const highToLow = filterAndSortSearchProducts(products, {
      ...defaultSearchFilterState,
      sortKey: "priceDesc",
    });

    expect(lowToHigh.map((product) => product.id)).toEqual([3, 1, 4, 2]);
    expect(highToLow.map((product) => product.id)).toEqual([2, 4, 1, 3]);
  });

  it("keeps the recommended order for sales proxy sorting", () => {
    const results = filterAndSortSearchProducts(products, {
      ...defaultSearchFilterState,
      sortKey: "salesDesc",
    });

    expect(results.map((product) => product.id)).toEqual([1, 2, 3, 4]);
  });

  it("filters by exact days and fifteen days plus", () => {
    const exact = filterAndSortSearchProducts(products, {
      ...defaultSearchFilterState,
      duration: 4,
    });
    const longTrip = filterAndSortSearchProducts(products, {
      ...defaultSearchFilterState,
      duration: "15plus",
    });

    expect(exact.map((product) => product.id)).toEqual([3]);
    expect(longTrip.map((product) => product.id)).toEqual([2]);
  });

  it("clears filter conditions by using the default state", () => {
    const results = filterAndSortSearchProducts(products, defaultSearchFilterState);

    expect(results.map((product) => product.id)).toEqual([1, 2, 3, 4]);
  });
});