#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2017 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections.Generic;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Core.Networks;
using HeuristicLab.Optimization;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Networks.IntegratedOptimization.TravelingThief {
  [Item("TtpNetwork", "An abstract base class for TTP optimization networks.")]
  [StorableClass]
  public abstract class TtpNetwork : Network, IOptimizer {
    #region Nodes
    public TtpOrchestratorNode1 Orchestrator {
      get { return (TtpOrchestratorNode1)Nodes["Orchestrator"]; }
    }

    public OrchestratedAlgorithmNode MetaSolver {
      get { return (OrchestratedAlgorithmNode)Nodes["MetaSolver"]; }
    }

    public OrchestratedAlgorithmNode TspSolver {
      get { return (OrchestratedAlgorithmNode)Nodes["TspSolver"]; }
    }

    public OrchestratedAlgorithmNode KspSolver {
      get { return (OrchestratedAlgorithmNode)Nodes["KspSolver"]; }
    }
    #endregion

    [StorableConstructor]
    protected TtpNetwork(bool deserializing) : base(deserializing) { }
    protected TtpNetwork(TtpNetwork original, Cloner cloner) : base(original, cloner) {
      RegisterEvents();
    }
    protected TtpNetwork() : this("TtpNetwork") { }
    protected TtpNetwork(string name) : base(name) {
      Nodes.Add(new TtpOrchestratorNode1("Orchestrator"));
      Nodes.Add(new OrchestratedAlgorithmNode("MetaSolver"));
      Nodes.Add(new OrchestratedAlgorithmNode("TspSolver"));
      Nodes.Add(new OrchestratedAlgorithmNode("KspSolver"));

      RegisterEvents();
    }

    [StorableHook(HookType.AfterDeserialization)]
    private void AfterDeserialization() {
      RegisterEvents();
    }

    protected virtual void RegisterEvents() {
      MetaSolver.AlgorithmChanged += MetaSolver_AlgorithmChanged;
      RegisterAlgorithmEvents();
    }

    protected virtual void RegisterAlgorithmEvents() {
      var algorithm = MetaSolver.Algorithm;
      if (algorithm == null) return;

      algorithm.ExecutionStateChanged += OnExecutionStateChanged;
      algorithm.ExecutionTimeChanged += OnExecutionTimeChanged;
      algorithm.Prepared += OnPrepared;
      algorithm.Started += OnStarted;
      algorithm.Paused += OnPaused;
      algorithm.Stopped += OnStopped;
      algorithm.ExceptionOccurred += OnExceptionOccurred;
    }

    protected virtual void MetaSolver_AlgorithmChanged(object sender, EventArgs e) {
      RegisterAlgorithmEvents();
    }

    #region IOptimizer Members
    public RunCollection Runs { get { return MetaSolver.Algorithm.Runs; } }
    public IEnumerable<IOptimizer> NestedOptimizers { get { yield break; } }
    public ExecutionState ExecutionState { get { return MetaSolver.Algorithm.ExecutionState; } }
    public TimeSpan ExecutionTime { get { return MetaSolver.Algorithm.ExecutionTime; } }

    public void Prepare() { Prepare(false); }
    public void Prepare(bool clearRuns) { Orchestrator.Prepare(clearRuns); }
    public void Start() { Orchestrator.StartAsync(); }
    public void Pause() { Orchestrator.Pause(); }
    public void Stop() { Orchestrator.Stop(); }
    #endregion

    private void OnExecutionStateChanged(object sender, EventArgs e) { OnExecutionStateChanged(); }
    private void OnExecutionTimeChanged(object sender, EventArgs e) { OnExecutionTimeChanged(); }
    private void OnPrepared(object sender, EventArgs e) { OnPrepared(); }
    private void OnStarted(object sender, EventArgs e) { OnStarted(); }
    private void OnPaused(object sender, EventArgs e) { OnPaused(); }
    private void OnStopped(object sender, EventArgs e) { OnStopped(); }
    private void OnExceptionOccurred(object sender, EventArgs<Exception> e) { OnExceptionOccurred(e.Value); }

    public event EventHandler ExecutionStateChanged;
    private void OnExecutionStateChanged() {
      var handler = ExecutionStateChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public event EventHandler ExecutionTimeChanged;
    private void OnExecutionTimeChanged() {
      var handler = ExecutionTimeChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public event EventHandler Prepared;
    private void OnPrepared() {
      var handler = Prepared;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public event EventHandler Started;
    private void OnStarted() {
      var handler = Started;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public event EventHandler Paused;
    private void OnPaused() {
      var handler = Paused;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public event EventHandler Stopped;
    private void OnStopped() {
      var handler = Stopped;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public event EventHandler<EventArgs<Exception>> ExceptionOccurred;
    private void OnExceptionOccurred(Exception exception) {
      var handler = ExceptionOccurred;
      if (handler != null) handler(this, new EventArgs<Exception>(exception));
    }
  }
}