import { apiFetch } from './client';
import type {
  BrandFilter,
  CategoryApiData,
  CategoryData,
  ComboSet,
  PagingCollection,
  PriceFilter,
  Product,
  ProductImageDetail,
  ProductImageGallery,
  ProductDetailData,
} from '@/types';
import type { TypeListProduct } from '@/types/global/TypeListProduct';
import { normalizeAssetUrl, normalizeHtmlAssetUrls } from '@/lib/normalizeAssetUrl';

function normalizeSlug(slug: string) {
  return slug.replace(/^\/+/, '');
}

function normalizeSearch(search?: string) {
  if (!search) {
    return '';
  }

  return search.startsWith('?') ? search : `?${search}`;
}

function normalizeProductList(productList: Product[] | Record<string, Product> | undefined) {
  if (!productList) {
    return [];
  }

  return Array.isArray(productList) ? productList : Object.values(productList);
}

function normalizeProductImage(image: ProductImageDetail): ProductImageDetail {
  return {
    small: normalizeAssetUrl(image.small),
    large: normalizeAssetUrl(image.large),
    original: normalizeAssetUrl(image.original),
  };
}

function normalizeProductGallery(images: ProductImageGallery[] | undefined) {
  if (!images) {
    return [];
  }

  return images.map((image) => ({
    ...image,
    size: normalizeProductImage(image.size),
  }));
}

function normalizeComboSet(comboSet: ComboSet[] | undefined) {
  if (!comboSet) {
    return [];
  }

  return comboSet.map((set) => ({
    ...set,
    group_list: set.group_list.map((group) => ({
      ...group,
      product_list: group.product_list.map((product) => ({
        ...product,
        images: {
          small: normalizeAssetUrl(product.images.small),
          large: normalizeAssetUrl(product.images.large),
        },
      })),
    })),
  }));
}

function normalizeProductDetail(data: ProductDetailData): ProductDetailData {
  return {
    ...data,
    image: normalizeAssetUrl(data.image),
    combo_set: normalizeComboSet(data.combo_set),
    product_info: {
      ...data.product_info,
      productImage: normalizeProductImage(data.product_info.productImage),
      productImageGallery: normalizeProductGallery(data.product_info.productImageGallery),
      productDescription: normalizeHtmlAssetUrls(data.product_info.productDescription),
      productSpec: normalizeHtmlAssetUrls(data.product_info.productSpec),
      multipartSpec: normalizeHtmlAssetUrls(data.product_info.multipartSpec),
      productSummary: normalizeHtmlAssetUrls(data.product_info.productSummary),
      thum_poster: normalizeAssetUrl(data.product_info.thum_poster),
    },
  };
}

function toNumber(value: string | number | null | undefined) {
  const normalizedValue =
    typeof value === 'string' ? value.replace(/[^\d.-]/g, '') : (value ?? 0).toString();
  const parsedValue = Number(normalizedValue);
  return Number.isFinite(parsedValue) ? parsedValue : 0;
}

function normalizeText(value: string | number | undefined) {
  return String(value ?? '')
    .normalize('NFD')
    .replace(/[\u0300-\u036f]/g, '')
    .toLowerCase();
}

function isCurrentFilterUrl(searchParams: URLSearchParams, targetUrl: string) {
  const target = new URL(targetUrl, 'http://local');
  const targetParams = new URLSearchParams(target.search);

  if ([...targetParams.keys()].length !== [...searchParams.keys()].length) {
    return false;
  }

  return [...targetParams.entries()].every(
    ([key, value]) => (searchParams.get(key) ?? '') === value,
  );
}

function filterByBrand(products: Product[], brandFilter: BrandFilter | undefined) {
  if (!brandFilter) {
    return products;
  }

  const expectedBrand = normalizeText(brandFilter.brand_index || brandFilter.name);

  return products.filter((product) => {
    const brandCandidates = [
      product.brand?.brand_index,
      product.brand?.name,
      product.brand?.url,
      product.categories?.[0]?.name,
    ];

    return brandCandidates.some((candidate) => normalizeText(candidate).includes(expectedBrand));
  });
}

function filterByPrice(products: Product[], priceFilter: PriceFilter | undefined) {
  if (!priceFilter || (!priceFilter.min && !priceFilter.max)) {
    return products;
  }

  const min = toNumber(priceFilter.min);
  const max = toNumber(priceFilter.max);

  return products.filter((product) => {
    const price = toNumber(product.price);
    if (min > 0 && price < min) {
      return false;
    }
    if (max > 0 && price > max) {
      return false;
    }
    return true;
  });
}

function sortProducts(products: Product[], sortKey: string | null) {
  const sortedProducts = [...products];

  switch (sortKey) {
    case 'price-desc':
      sortedProducts.sort((left, right) => toNumber(right.price) - toNumber(left.price));
      break;
    case 'price-asc':
      sortedProducts.sort((left, right) => toNumber(left.price) - toNumber(right.price));
      break;
    case 'view':
      sortedProducts.sort((left, right) => toNumber(right.visit) - toNumber(left.visit));
      break;
    case 'comment':
      sortedProducts.sort(
        (left, right) => toNumber(right.comment?.total) - toNumber(left.comment?.total),
      );
      break;
    case 'rating':
      sortedProducts.sort((left, right) => toNumber(right.rating) - toNumber(left.rating));
      break;
    case 'name':
      sortedProducts.sort((left, right) => left.productName.localeCompare(right.productName, 'vi'));
      break;
    case 'new':
    default:
      sortedProducts.sort(
        (left, right) => new Date(right.lastUpdate).getTime() - new Date(left.lastUpdate).getTime(),
      );
      break;
  }

  return sortedProducts;
}

function buildPagingCollection(
  category: CategoryApiData,
  searchParams: URLSearchParams,
  totalPages: number,
  currentPage: number,
): PagingCollection[] {
  return Array.from({ length: totalPages }, (_, index) => {
    const page = index + 1;
    const nextSearchParams = new URLSearchParams(searchParams);

    if (page === 1) {
      nextSearchParams.delete('page');
    } else {
      nextSearchParams.set('page', String(page));
    }

    const queryString = nextSearchParams.toString();

    return {
      name: String(page),
      url: queryString ? `${category.current_category.url}?${queryString}` : category.current_category.url,
      is_active: page === currentPage ? '1' : '0',
    };
  });
}

function applyCategorySearchParams(category: CategoryApiData, search?: string): CategoryData {
  const searchParams = new URLSearchParams(normalizeSearch(search));
  let productList = normalizeProductList(category.product_list);

  if (searchParams.get('other_filter') === 'in-stock') {
    productList = productList.filter((product) => toNumber(product.quantity) > 0);
  }

  const selectedBrand = category.brand_filter_list?.find((item) =>
    isCurrentFilterUrl(searchParams, item.url),
  );
  productList = filterByBrand(productList, selectedBrand);

  const selectedPrice = category.price_filter_list?.find((item) =>
    isCurrentFilterUrl(searchParams, item.url),
  );
  productList = filterByPrice(productList, selectedPrice);

  productList = sortProducts(productList, searchParams.get('sort'));

  const totalProducts = productList.length;
  const configuredPageCount = toNumber(category.paging_count);
  const perPage =
    configuredPageCount > 0 ? Math.max(1, Math.ceil(totalProducts / configuredPageCount)) : totalProducts;
  const totalPages =
    perPage > 0 ? Math.max(1, Math.ceil(totalProducts / perPage)) : Math.max(1, configuredPageCount);
  const requestedPage = toNumber(searchParams.get('page'));
  const currentPage = Math.min(Math.max(requestedPage || 1, 1), totalPages);
  const pagedProducts =
    perPage > 0 ? productList.slice((currentPage - 1) * perPage, currentPage * perPage) : productList;

  return {
    ...category,
    product_count: String(totalProducts),
    paging_count: String(totalPages),
    paging_collection: buildPagingCollection(category, searchParams, totalPages, currentPage),
    product_list: pagedProducts,
  };
}

export function getProductHot() {
  return apiFetch<TypeListProduct>('/products/hot');
}

export function getProductDetail(slug: string) {
  return apiFetch<ProductDetailData>(`/products/${normalizeSlug(slug)}`).then((product) =>
    normalizeProductDetail(product),
  );
}

export function getProductComments(slug: string) {
  return apiFetch<import('@/types/Comment').ProductCommentData[]>(
    `/products/${normalizeSlug(slug)}/comments`,
  );
}

export function getProductReviews(slug: string) {
  return apiFetch<import('@/types/Review').ProductReviewData[]>(
    `/products/${normalizeSlug(slug)}/reviews`,
  );
}

export function getProductCategory(slug: string, search?: string) {
  const normalizedSearch = normalizeSearch(search);

  return apiFetch<CategoryApiData>(`/products/category/${normalizeSlug(slug)}${normalizedSearch}`).then(
    (category) => applyCategorySearchParams(category, normalizedSearch),
  );
}

export function getProductHotPage(slug: string) {
  return apiFetch<import('@/types/producthot').TypeProductHot>(
    `/products/hot-page/${normalizeSlug(slug)}`,
  );
}

export function getProductSearch(q: string) {
  return apiFetch<import('@/types/product/search').TypeProductSearch>(`/products/search?q=${encodeURIComponent(q)}`);
}