using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using NUnit.Framework;
using Pithos.Interfaces;


namespace Pithos.Network.Test
{
    [TestFixture]
    class ChecksumTest
    {

        private ICloudClient client;
        [SetUp]
        public void Setup()
        {
            var account = "890329@vho.grnet.gr";
            var apiKey = "24989dce4e0fcb072f8cb60c8922be19";
            client = new CloudFilesClient(account, apiKey);
            client.Authenticate();
            
        }

        [Test]
        public void TestChecksum()
        {
            Assert.DoesNotThrow(() =>
            {

                var filePath = "devguide.pdf";
                var info=new FileInfo(filePath);

               
                    var hash = CalculateHash(filePath);
                    
                    client.PutObject(null, "Shares", info.Name, filePath);


                    var meta = client.GetObjectInfo(null, "Shares", "DeveloperGuide.pdf");
                    Assert.IsNotEmpty(meta.Hash);
                    

                    Assert.AreEqual(hash,meta.Hash,String.Format("The hashes don't match, expected {0} but got {1}",hash,meta.Hash));
                

            });

        
        }

        private static string CalculateHash(string fileName)
        {
            string hash;
            using (var hasher = MD5.Create())
            using(var stream=File.OpenRead(fileName))
            {
                var hashBuilder = new StringBuilder();
                foreach (byte b in hasher.ComputeHash(stream))
                    hashBuilder.Append(b.ToString("x2").ToLower());
                hash = hashBuilder.ToString();
            }
            return hash;
        }
    }
}