using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
using HeuristicLab.Services.Hive.Common.ServiceContracts;
using HeuristicLab.Services.Hive.Common.DataTransfer;
using System.IO;
using System.Security.Permissions;
using System.Data.Linq;
using HeuristicLab.Services.Hive.Common;
using System.Transactions;

namespace HeuristicLab.Services.Hive {

  /// <summary>
  /// Implementation of the Hive service (interface <see cref="IHiveService"/>).
  /// </summary>
  [ServiceBehavior(InstanceContextMode=InstanceContextMode.PerCall)]
  public class HiveService : IHiveService {
    private DataAccess.IHiveDao dao {
      get { return ServiceLocator.Instance.HiveDao; }
    }
    private HeuristicLab.Services.Hive.DataAccess.TransactionManager trans {
      get { return ServiceLocator.Instance.TransactionManager; }
    }
    private IAuthorizationManager auth {
      get { return ServiceLocator.Instance.AuthorizationManager; }
    }
    private ILifecycleManager lifecycleManager {
      get { return ServiceLocator.Instance.LifecycleManager; }
    }

    #region Job Methods
    //[PrincipalPermission(SecurityAction.Demand, Role = HiveRoles.Administrator)]
    //[PrincipalPermission(SecurityAction.Demand, Role = HiveRoles.Client)]
    public Guid AddJob(Job job, JobData jobData) {
      using (trans.OpenTransaction()) {
        jobData.JobId = dao.AddJob(job);
        dao.AddJobData(jobData);
        return jobData.JobId;
      }
    }

    public Guid AddChildJob(Guid parentJobId, Job job, JobData jobData) {
      using (trans.OpenTransaction()) {
        job.ParentJobId = parentJobId;
        return AddJob(job, jobData);
      }
    }

    public Job GetJob(Guid jobId) {
      return dao.GetJob(jobId);
    }

    public IEnumerable<Job> GetJobs() {
      return dao.GetJobs(x => true);
    }

    public IEnumerable<LightweightJob> GetLightweightJobs(IEnumerable<Guid> jobIds) {
      return dao.GetJobs(x => jobIds.Contains(x.JobId)).Select(x => new LightweightJob(x)).ToArray();
    }

    public IEnumerable<LightweightJob> GetLightweightChildJobs(Guid? parentJobId, bool recursive, bool includeParent) {
      return GetChildJobs(parentJobId, recursive, includeParent).Select(x => new LightweightJob(x)).ToArray();
    }

    // formerly GetLastSerializedResult
    public JobData GetJobData(Guid jobId) {
      return dao.GetJobData(jobId);
    }

    public Stream GetJobDataStreamed(Guid jobId) {
      throw new NotImplementedException();
    }

    public void UpdateJob(Job jobDto, JobData jobDataDto) {
      using (trans.OpenTransaction()) {
        dao.UpdateJob(jobDto);
        dao.UpdateJobData(jobDataDto);
      }
    }

    public void UpdateJobDataStreamed(Stream stream) {
      using (trans.OpenTransaction()) {
        throw new NotImplementedException();
      }
    }

    public void DeleteChildJobs(Guid jobId) {
      using (trans.OpenTransaction()) {
        var jobs = GetChildJobs(jobId, true, false);
        foreach (var job in jobs) {
          dao.DeleteJob(job.Id);
          dao.DeleteJobData(job.Id);
        };
      }
    }

    public Job AquireJob(Guid slaveId) {
      using (trans.OpenTransaction()) {
        var slave = dao.GetSlave(slaveId);
        var availableJobs = dao.GetWaitingJobs(slave);
        var job = availableJobs.FirstOrDefault();

        if (job != null) {
          job.SlaveId = slaveId;
          job.JobState = JobState.Calculating;
        }
        return job;
      }
    }
    #endregion

    #region Job Control Methods
    public void StopJob(Guid jobId) {
      using (trans.OpenTransaction()) {
        throw new NotImplementedException();
      }
    }
    public void PauseJob(Guid jobId) {
      using (trans.OpenTransaction()) {
        throw new NotImplementedException();
      }
    }
    #endregion

    #region HiveExperiment Methods

    public HiveExperiment GetHiveExperiment(Guid id) {
      return dao.GetHiveExperiments(x => x.UserId == auth.UserId && x.HiveExperimentId == id).FirstOrDefault();
    }

    public IEnumerable<HiveExperiment> GetHiveExperiments() {
      return dao.GetHiveExperiments(x => x.UserId == auth.UserId);
    }

    public Guid AddHiveExperiment(HiveExperiment hiveExperimentDto) {
      using (trans.OpenTransaction()) {
        hiveExperimentDto.UserId = auth.UserId;
        return dao.AddHiveExperiment(hiveExperimentDto);
      }
    }

    public void UpdateHiveExperiment(HiveExperiment hiveExperimentDto) {
      using (trans.OpenTransaction()) {
        dao.UpdateHiveExperiment(hiveExperimentDto);
      }
    }

    public void DeleteHiveExperiment(Guid hiveExperimentId) {
      using (trans.OpenTransaction()) {
        HiveExperiment he = dao.GetHiveExperiment(hiveExperimentId);
        if (he.RootJobId.HasValue) {
          var jobs = GetChildJobs(he.RootJobId.Value, true, true);
          foreach (var j in jobs) {
            dao.DeleteJobData(j.Id);
            dao.DeleteJob(j.Id);
          }
        }
        dao.DeleteHiveExperiment(hiveExperimentId);
      }
    }
    #endregion
    
    #region Login Methods
    public void Hello(Guid slaveId, string name, int cores, int memory) {
      throw new NotImplementedException();
    }

    public void GoodBye() {
      throw new NotImplementedException();
    }
    #endregion

    #region Heartbeat Methods
    public List<MessageContainer> Heartbeat(Heartbeat heartbeat) {
      using (trans.OpenTransaction()) {
        return lifecycleManager.ProcessHeartbeat(heartbeat);
      }
    }
    #endregion

    #region Plugin Methods
    public Guid AddPlugin(Plugin plugin, List<PluginData> pluginDatas) {
      using (trans.OpenTransaction()) {
        Guid pluginId = dao.AddPlugin(plugin);
        foreach (PluginData pluginData in pluginDatas) {
          pluginData.PluginId = pluginId;
          dao.AddPluginData(pluginData);
        }
        return pluginId;
      }
    }
    public IEnumerable<Plugin> GetPlugins() {
      return dao.GetPlugins(x => true);
    }
    public IEnumerable<PluginData> GetPluginDatas(List<Guid> pluginIds) {
      throw new NotImplementedException();
    }
    public Stream GetStreamedPluginDatas(List<Guid> pluginIds) {
      throw new NotImplementedException();
    }
    #endregion
    
    #region Slave Methods
    public Guid AddSlave(Slave slave) {
      using (trans.OpenTransaction()) {
        return dao.AddSlave(slave);
      }
    }

    public Guid AddSlaveGroup(SlaveGroup slaveGroup) {
      using (trans.OpenTransaction()) {
        return dao.AddSlaveGroup(slaveGroup);
      }
    }

    public IEnumerable<Slave> GetSlaves() {
      return dao.GetSlaves(x => true);
    }

    public IEnumerable<SlaveGroup> GetSlaveGroups() {
      return dao.GetSlaveGroups(x => true);
    }

    public void DeleteSlaveGroup(Guid slaveGroupId) {
      using (trans.OpenTransaction()) {
        dao.DeleteSlaveGroup(slaveGroupId);
      }
    }

    public void AddResourceToGroup(Guid slaveGroupId, Resource resource) {
      using (trans.OpenTransaction()) {
        throw new NotImplementedException();
      }
    }

    public void RemoveResourceFromGroup(Guid clientGroupId, Guid resourceId) {
      using (trans.OpenTransaction()) {
        throw new NotImplementedException();
      }
    }

    public void UpdateSlave(Slave slave) {
      using (trans.OpenTransaction()) {
        dao.UpdateSlave(slave);
      }
    }
    #endregion

    #region Helper Methods
    private IEnumerable<Job> GetChildJobs(Guid? parentJobId, bool recursive, bool includeParent) {
      var jobs = new List<Job>(dao.GetJobs(x => parentJobId == null ? !x.ParentJobId.HasValue : x.ParentJobId.Value == parentJobId));

      if (includeParent) {
        jobs.Add(GetJob(parentJobId.Value));
      }

      if (recursive) {
        var childs = new List<Job>();
        foreach (var job in jobs) {
          childs.AddRange(GetChildJobs(job.Id, recursive, false));
        }
        jobs.AddRange(childs);
      }
      return jobs;
    }

    #endregion

  }
}