#region License Information

/* HeuristicLab
 * Copyright (C) 2002-2019 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 System.Drawing;
using System.Linq;
using HEAL.Attic;
using HeuristicLab.Common;
using HeuristicLab.Core;

namespace HeuristicLab.Problems.DataAnalysis {
  [StorableType("A56BFB05-8F11-4766-9FBF-20C7010F1CA3")]
  [Item("ProblemDataConstraints", "Represents constraints associated with a problem data.")]
  public class ProblemDataConstraint : Item {
    private static readonly string exampleInput = "# Example for a target variable constraint:"     +
                                                  Environment.NewLine                               +
                                                  "Target:'y' in [0 .. 100]"                        +
                                                  Environment.NewLine                               +
                                                  Environment.NewLine                               +
                                                  "# Example for constraints on model parameters: " +
                                                  Environment.NewLine                               +
                                                  "d'y'/d'x' in [0 .. 10]"                          +
                                                  Environment.NewLine                               +
                                                  "∂²'y'/∂'x'² in [-1 .. inf.]";

    [Storable] private string input;

    public string Input {
      get => input;
      set {
        if (input == value) return;
        input = value;
        OnChanged();
      }
    }

    [Storable] private string infoText;

    public string InfoText {
      get => infoText;
      set {
        if (infoText == value) return;
        infoText = value;
        OnChanged();
      }
    }

    [Storable] private Color infoColor;

    public Color InfoColor {
      get => infoColor;
      set {
        if (infoColor == value) return;
        infoColor = value;
        OnChanged();
      }
    }

    [Storable] private IEnumerable<IntervalConstraint> constraints;

    public IEnumerable<IntervalConstraint> Constraints {
      get => constraints;
      set {
        if (constraints == value) return;
        constraints = value.ToList();
        OnChanged();
      }
    }

    public IEnumerable<IntervalConstraint> EnabledConstraints => Constraints.Where(c => c.Enabled);


    [Storable] public IRegressionProblemData ProblemData { get; private set; }

    [StorableConstructor]
    protected ProblemDataConstraint(StorableConstructorFlag _) : base(_) { }

    protected ProblemDataConstraint(ProblemDataConstraint original, Cloner cloner)
      : base(original, cloner) {
      Input       = original.Input;
      InfoText    = original.InfoText;
      infoColor   = original.InfoColor;
      constraints = original.Constraints.Select(cloner.Clone).ToList();
      ProblemData = cloner.Clone(original.ProblemData);
    }

    public override IDeepCloneable Clone(Cloner cloner) {
      return new ProblemDataConstraint(this, cloner);
    }

    public ProblemDataConstraint() {
      Input       = exampleInput;
      InfoText    = "";
      InfoColor   = Color.DarkOrange;
      constraints = new List<IntervalConstraint>();
      ProblemData = null;
    }

    public ProblemDataConstraint(IRegressionProblemData problemData) {
      Input       = exampleInput;
      InfoText    = infoText;
      InfoColor   = InfoColor;
      constraints = new List<IntervalConstraint>();
      ProblemData = problemData;
    }

    public event EventHandler Changed;

    protected virtual void OnChanged() {
      var handlers = Changed;
      if (handlers != null)
        handlers(this, EventArgs.Empty);
    }
  }
}