using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Threading.Tasks;
using FuzzySharp;
using FuzzySharp.Extractor;
using Props.Shop.Framework;

namespace Props.Shop.Adafruit.Api
{
    public class SearchManager : IDisposable
    {
        public float Similarity { get; set; }
        public IProductListingManager ProductListingManager { get; private set; }
        private bool disposedValue;

        public SearchManager(IProductListingManager productListingManager, float similarity = 0.8f)
        {
            this.ProductListingManager = productListingManager ?? throw new ArgumentNullException("productListingManager");
            this.Similarity = similarity;
        }

        public async IAsyncEnumerable<ProductListing> Search(string query)
        {
            // TODO: Implement indexed search.
            if (ProductListingManager.ProductListings == null) {
                ProductListingManager.RefreshProductListings();
            }
            IReadOnlyDictionary<string, IList<ProductListing>> productListings = await ProductListingManager.ProductListings;
            if (productListings == null) throw new InvalidAsynchronousStateException("productListings can't be null");
            foreach (ExtractedResult<string> listingNames in Process.ExtractAll(query, productListings.Keys, cutoff: (int)(Similarity * 100)))
            {
                foreach (ProductListing same in productListings[listingNames.Value])
                {
                    yield return same;
                }
            }
        }

        protected virtual void Dispose(bool disposing)
        {
            if (!disposedValue)
            {
                if (disposing)
                {
                    ProductListingManager.Dispose();
                }

                disposedValue = true;
            }
        }

        public void Dispose()
        {
            Dispose(disposing: true);
            GC.SuppressFinalize(this);
        }
    }
}