using System;
using System.Linq;
using System.Text;
using HeuristicLab.Problems.QuadraticAssignment;

namespace HeuristicLab.Services.ProblemInstances.QAPInitializer {
  class Program {
    static void Main(string[] args) {
      QuadraticAssignmentProblem qap = new QuadraticAssignmentProblem();
      using (ProblemInstancesEntities context = new ProblemInstancesEntities()) {
        foreach (string instance in qap.EmbeddedInstances) {
          qap.LoadEmbeddedInstance(instance);
          // transform DoubleMatrix into multidimensional array
          double[,] weights = new double[qap.Weights.Rows, qap.Weights.Columns];
          double[,] distances = new double[qap.Distances.Rows, qap.Distances.Columns];
          for (int i = 0; i < weights.GetLength(0); i++) {
            for (int j = 0; j < weights.GetLength(1); j++) {
              weights[i, j] = qap.Weights[i, j];
              distances[i, j] = qap.Distances[i, j];
            }
          }

          QAPInstance dbInstance = context.CreateObject<QAPInstance>();
          dbInstance.Name = qap.Name;
          dbInstance.Description = qap.Description;
          dbInstance.Maximization = qap.Maximization.Value;
          dbInstance.Weights = SimpleSerializer.SerializeDoubleMatrix(weights);
          dbInstance.WeightsHash = GetSHA1Hash(dbInstance.Weights);
          dbInstance.Distances = SimpleSerializer.SerializeDoubleMatrix(distances);
          dbInstance.DistancesHash = GetSHA1Hash(dbInstance.Distances);
          dbInstance.ProblemSize = qap.Weights.Rows;
          context.QAPInstances.AddObject(dbInstance);

          if (qap.BestKnownQuality != null) {
            QAPSolution dbSolution = context.CreateObject<QAPSolution>();
            if (qap.BestKnownSolution != null) {
              dbSolution.Assignment = SimpleSerializer.SerializeIntArray(qap.BestKnownSolution.ToArray());
              dbSolution.AssignmentHash = GetSHA1Hash(dbSolution.Assignment);
            }
            dbSolution.Instance = dbInstance;
            dbSolution.Quality = qap.BestKnownQuality.Value;
            context.QAPSolutions.AddObject(dbSolution);
          }
        }
        context.SaveChanges();
      }
    }

    public static string GetSHA1Hash(string text) {
      var SHA1 = new System.Security.Cryptography.SHA1CryptoServiceProvider();

      byte[] arrayData;
      byte[] arrayResult;
      string result = null;
      string temp = null;

      arrayData = Encoding.ASCII.GetBytes(text);
      arrayResult = SHA1.ComputeHash(arrayData);
      for (int i = 0; i < arrayResult.Length; i++) {
        temp = Convert.ToString(arrayResult[i], 16);
        if (temp.Length == 1)
          temp = "0" + temp;
        result += temp;
      }
      return result;
    }
  }
}