'use client';

import { shopifyFetch } from '@/services/shopify/client';
import {
  SEARCH_PRODUCTS_QUERY,
  SEARCH_SUGGESTIONS_QUERY,
} from '@/graphql/search';
import type { Product } from '@/hooks/use-shopify-products';

export type SearchSortKey = 'RELEVANCE' | 'PRICE';

export interface SearchFilterValue {
  id: string;
  label: string;
  count: number;
  /** JSON string accepted back as a `ProductFilter` input. */
  input: string;
}

export interface SearchFilter {
  id: string;
  label: string;
  type: 'LIST' | 'PRICE_RANGE' | 'BOOLEAN';
  values: SearchFilterValue[];
}

export interface SearchProductsResult {
  products: Product[];
  totalCount: number;
  filters: SearchFilter[];
  hasNextPage: boolean;
  endCursor: string | null;
}

export interface SearchSuggestion {
  id: string;
  title: string;
  handle: string;
  featuredImage?: {
    url: string;
    altText?: string;
  } | null;
  priceRange: {
    minVariantPrice: {
      amount: string;
      currencyCode: string;
    };
  };
}

interface SearchProductsOptions {
  query: string;
  first?: number;
  after?: string | null;
  sortKey?: SearchSortKey;
  reverse?: boolean;
  /** Raw `input` strings from the facets, parsed back into filter objects. */
  filterInputs?: string[];
}

function parseFilterInputs(inputs: string[]): unknown[] {
  return inputs.flatMap((input) => {
    try {
      return [JSON.parse(input)];
    } catch {
      console.warn('Ignoring malformed product filter input:', input);
      return [];
    }
  });
}

export async function searchProducts({
  query,
  first = 24,
  after = null,
  sortKey = 'RELEVANCE',
  reverse = false,
  filterInputs = [],
}: SearchProductsOptions): Promise<SearchProductsResult> {
  const response = await shopifyFetch({
    query: SEARCH_PRODUCTS_QUERY,
    variables: {
      query,
      first,
      after,
      sortKey,
      reverse,
      productFilters: filterInputs.length
        ? parseFilterInputs(filterInputs)
        : null,
    },
  });

  const search = response.data.search;

  return {
    products: search.edges.map((edge: { node: Product }) => edge.node),
    totalCount: search.totalCount ?? 0,
    filters: search.productFilters ?? [],
    hasNextPage: Boolean(search.pageInfo?.hasNextPage),
    endCursor: search.pageInfo?.endCursor ?? null,
  };
}

export async function searchSuggestions(
  query: string,
  first = 3
): Promise<{ products: SearchSuggestion[]; totalCount: number }> {
  const response = await shopifyFetch({
    query: SEARCH_SUGGESTIONS_QUERY,
    variables: { query, first },
  });

  const search = response.data.search;

  return {
    products: search.edges.map((edge: { node: SearchSuggestion }) => edge.node),
    totalCount: search.totalCount ?? 0,
  };
}