using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Linq;
using System.Net;
using Newtonsoft.Json;
using Scryfalltypes;
using System.Threading.Tasks;
using System.Diagnostics;

namespace creatureBirdDwarf
{
    class Program
    {
        static async Task Main(string[] args)
        {
            var request = WebRequest.Create("https://api.scryfall.com/bulk-data");
            var response = request.GetResponse();
            BulkMetaEntry oracleMeta, defaultMeta;
            using (var dataStream = new StreamReader(response.GetResponseStream()))
            {
                string responseFromServer = dataStream.ReadToEnd();
                var bulk = JsonConvert.DeserializeObject<BulkDataList>(responseFromServer);
                oracleMeta = bulk.data.FirstOrDefault(d => d.type == "oracle_cards");
                defaultMeta = bulk.data.FirstOrDefault(d => d.type == "default_cards");
            }

            Console.WriteLine("found oracle download uri");
            Console.WriteLine("scryfall requests 50-100 ms between requests...");
            await Task.Delay(100);
            Console.WriteLine("should be good.");

            request = WebRequest.Create(oracleMeta.download_uri);
            response = request.GetResponse();
            var OracleIDd = new List<Card>();
            using (var dataStream = new StreamReader(response.GetResponseStream()))
            {
                string responseFromServer = dataStream.ReadToEnd();
                OracleIDd = JsonConvert.DeserializeObject<List<Card>>(responseFromServer);
            }
            foreach (var card in OracleIDd)
            {
                card.prices = null;
            }

            Console.WriteLine("stripped price data, writing to file");

            File.WriteAllText("./oracle-now.json", JsonConvert.SerializeObject(OracleIDd, Formatting.Indented));
            var checksumNow = GetChecksum("./oracle-now.json");
            Console.WriteLine($"oracled checksum: {checksumNow}");

            if (!File.Exists("./oracled.json"))
            {
                File.CreateText("./oracled.json");
                Console.WriteLine("no oracled.json, can't help but assume checksums will be different");
            }
            var checksumOlder = GetChecksum("./oracled.json");
            Console.WriteLine($"previous oracled checksum: {checksumOlder}");

            if (checksumOlder != checksumNow)
            {
                Console.WriteLine("looks different, going to have to update.");
                Console.WriteLine("scryfall requests 50-100 ms between requests...");
                await Task.Delay(100);
                Console.WriteLine("should be good.");
                File.Delete("./oracled.json");
                File.Move("./oracle-now.json", "./oracled.json");

                request = WebRequest.Create(defaultMeta.download_uri);
                response = request.GetResponse();
                var defaultList = new List<Card>();
                using (var dataStream = new StreamReader(response.GetResponseStream()))
                {
                    string responseFromServer = dataStream.ReadToEnd();
                    defaultList = JsonConvert.DeserializeObject<List<Card>>(responseFromServer);
                    File.WriteAllText("./default.json", JsonConvert.SerializeObject(defaultList, Formatting.Indented));
                }
            }
            else
            {
                Console.Write("same checksum (no update)");
                File.Delete("./oracle-now.json");
            }
        }

        private static string GetChecksum(string filePath)
        {
            using (var stream = new BufferedStream(File.OpenRead(filePath), 1200000))
            {
                SHA256Managed sha = new SHA256Managed();
                byte[] checksum = sha.ComputeHash(stream);
                return BitConverter.ToString(checksum).Replace("-", String.Empty);
            }
        }
    }
}