using System;
using System.Collections.Generic;
using Newtonsoft.Json;
using SPT.Common.Http;

namespace UIFixes.util {
    internal static class FleaPriceCache {
        static Dictionary<string, CachePrice> cache = new Dictionary<string, CachePrice>();

        public static double? FetchPrice(string templateId) {
            Console.WriteLine($"Get price for {templateId}");
            if (cache.ContainsKey(templateId)) {
                double secondsSinceLastUpdate = (DateTime.Now - cache[templateId].lastUpdate).TotalSeconds;
                if (secondsSinceLastUpdate > 300)
                    return QueryAndTryUpsertPrice(templateId, true);
                return cache[templateId].price;
            }

            return QueryAndTryUpsertPrice(templateId, false);
        }

        private static string QueryPrice(string templateId) {
            return RequestHandler.PostJson("/LootValue/GetItemLowestFleaPrice",
                JsonConvert.SerializeObject(new FleaPriceRequest(templateId)));
        }

        private static double? QueryAndTryUpsertPrice(string templateId, bool update) {
            string response = QueryPrice(templateId);

            bool hasPlayerFleaPrice = !(string.IsNullOrEmpty(response) || response == "null");

            if (hasPlayerFleaPrice) {
                double price = double.Parse(response);

                if (update)
                    cache[templateId].Update(price);
                else
                    cache[templateId] = new CachePrice(price);

                return price;
            }

            return null;
        }
    }

    public class FleaPriceRequest {
        public string templateId;
        public FleaPriceRequest(string templateId) => this.templateId = templateId;
    }

    internal class CachePrice {
        public double price { get; private set; }
        public DateTime lastUpdate { get; private set; }

        public CachePrice(double price) {
            this.price = price;
            lastUpdate = DateTime.Now;
        }

        public void Update(double price) {
            this.price = price;
            lastUpdate = DateTime.Now;
        }
    }
}