using ConsoleApp1.Mile;
using Newtonsoft.Json.Linq;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http.Headers;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;


namespace ConsoleApp1.Mile
{
    internal class FuntoroMile
    {
        public static void Test()
        {
            var license = "EAA-127";
            var apiUrl = "http://cloud.funtoro.com/twchannel1/api/index.php/ebus";
            var apiKey = "FUN2yOf05bUS";
            new FuntoroMile().GetVehicleMileage(license, apiUrl, apiKey);
        }

        public double GetVehicleMileage(string VehicleLicense, string apiUrl, string apiKey)
        {
            double mileage = 0;
            var dt = DateTime.Now;
            var dto = new { Code = 106, VehicleLicense };

            var sJ = JsonConvert.SerializeObject(dto);

            var sign = GetSignature(apiKey, dt, sJ);

            var signedDto = new { Data = sJ, Ts = GetUnixTimeSeconds(dt), Signature = sign };

            var vvJ = JsonConvert.SerializeObject(signedDto);

            try
            {
                var client = new HttpClient() { Timeout = TimeSpan.FromMilliseconds(60000) };
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                var response = client.PostAsync(apiUrl, new StringContent(vvJ, Encoding.UTF8, "application/json")).Result;
                string responseBody = response.Content.ReadAsStringAsync().Result;

                Console.WriteLine(responseBody);

                if (response.IsSuccessStatusCode)
                {
                    JObject jo = JObject.Parse(responseBody);

                    int state = jo["State"].Value<int>();
                    if (state == 1)
                    {
                        mileage = jo["Mileage"].Value<double>();

                    }
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(string.Format(" {0} 呼叫 里程數API 發生問題 {1}", VehicleLicense, e.ToString()));
            }

            return mileage;
        }

        private string GetSignature(string apikey, DateTime dt, string requestBody)
        {
            long ts = 0;
            ts = GetUnixTimeSeconds(dt);

            //取得簽章
            var str = string.Format("{0}{1}{2}"
                 , ts
                , requestBody
                 , apikey);
            return BackendCrytography.MD5ToHex_UTF8(str);
        }

        private static long GetUnixTimeSeconds(DateTime dt)
        {
            DateTimeOffset _offset = new DateTimeOffset(dt);
            return DateTimeToUnixTimestamp(_offset.DateTime);
        }

        private static long DateTimeToUnixTimestamp(DateTime dateTime)
        {
            var start = new DateTime(1970, 1, 1, 0, 0, 0, dateTime.Kind);
            return Convert.ToInt64((dateTime - start).TotalSeconds);
        }
    }

    public class BackendCrytography
    {
        /// <summary>
        /// Returns a MD5 hash as a string
        /// </summary>
        /// <param name="TextToHash">String to be hashed.</param>
        /// <returns>Hash as string.</returns>
        public static String MD5ToHex_UTF8(String TextToHash)
        {
            if ((TextToHash == null) || (TextToHash.Length == 0))
            {
                return String.Empty;
            }

            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] textToHash = Encoding.UTF8.GetBytes(TextToHash);
            byte[] result = md5.ComputeHash(textToHash);
            return BitConverter.ToString(result).Replace("-", "").ToLower();
        }

        /// <summary>
        /// Returns a MD5 hash as a string
        /// </summary>
        /// <param name="TextToHash">String to be hashed.</param>
        /// <returns>Hash as string.</returns>
        public static String GetMD5Hash(String TextToHash)
        {
            if ((TextToHash == null) || (TextToHash.Length == 0))
            {
                return String.Empty;
            }

            MD5 md5 = new MD5CryptoServiceProvider();
            //MD5 md5 = MD5.Create();
            //byte[] textToHash = Encoding.Default.GetBytes(TextToHash);
            byte[] textToHash = Encoding.UTF8.GetBytes(TextToHash);
            byte[] result = md5.ComputeHash(textToHash);
            var b64 = Convert.ToBase64String(result);

            return b64;
        }

        public static String GetSHA256Hash(String TextToHash)
        {
            if ((TextToHash == null) || (TextToHash.Length == 0))
            {
                return String.Empty;
            }
            SHA256 sha256 = new SHA256CryptoServiceProvider();//建立一個SHA256
            byte[] source = Encoding.Default.GetBytes(TextToHash);//將字串轉為Byte[]
            byte[] crypto = sha256.ComputeHash(source);//進行SHA256加密
            return Convert.ToBase64String(crypto);
        }


        public static string GetFileMD5Hash(string filePath)
        {
            using (var md5 = MD5.Create())
            {
                using (var stream = File.OpenRead(filePath))
                {
                    return BitConverter.ToString(md5.ComputeHash(stream)).Replace("-", "").ToLower();
                }
            }
        }

        public static string GetFileMD5Hash(Stream stream)
        {
            using (var md5 = MD5.Create())
            {
                return BitConverter.ToString(md5.ComputeHash(stream)).Replace("-", "").ToUpper();
            }
        }
    }
}