using System;
using System.Collections.Generic;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HEAL.Attic;

namespace HeuristicLab.Problems.DataAnalysis {
  [StorableType("A56BFB05-8F11-4766-9FBF-20C7010F1CA3")]
  [Item("ParsedConstraint", "Represents parsed constraints.")]
  public class ParsedConstraint : 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 constraint on model parameter: " + Environment.NewLine +
                                                  "dy/dx in [0 .. 10]" + Environment.NewLine +
                                                  "\u2202²y/\u2202x² in ]-1 .. inf.[";
      
    public string Input { get; set; }

    private IEnumerable<IntervalConstraint> constraints;
    public IEnumerable<IntervalConstraint> Constraints {
      get => constraints;
      set { 
        constraints = value;
        OnChanged(EventArgs.Empty);
      }
  }
    public IRegressionProblemData ProblemData { get; set; }

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

    protected ParsedConstraint(ParsedConstraint original, Cloner cloner)
      : base(original, cloner) {
      this.Input = original.Input;
      this.constraints = original.Constraints;
      this.ProblemData = original.ProblemData;
    }

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

    public ParsedConstraint() {
      this.Input = exampleInput;
      this.constraints = new CheckedItemList<IntervalConstraint>();
      this.ProblemData = null;
    }

    public ParsedConstraint(IRegressionProblemData problemData) {
      this.Input = exampleInput;
      this.constraints = new List<IntervalConstraint>();
      this.ProblemData = problemData;
    }

    public ParsedConstraint(string input, IRegressionProblemData problemData) {
      this.Input = input;
      this.constraints = new CheckedItemList<IntervalConstraint>();
      this.ProblemData = problemData;
    }

    public ParsedConstraint(string input, IEnumerable<IntervalConstraint> constraints) {
      this.Input = input;
      this.constraints = constraints;
    }

    public event EventHandler Changed;
    protected virtual void OnChanged(EventArgs e) {
      EventHandler handlers = Changed;
      if (handlers != null)
        handlers(this, e);
    }
  }
}