// Copyright 2010-2017 Google
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

namespace Google.OrTools.LinearSolver {
using System;
using System.Collections.Generic;

// Patch the MPVariable class to support the natural language API.
public partial class Variable {
  public static LinearExpr operator+(Variable a, double v)
  {
    return new VarWrapper(a) + v;
  }

  public static LinearExpr operator+(double v, Variable a)
  {
    return a + v;
  }

  public static LinearExpr operator+(Variable a, LinearExpr b)
  {
    return new VarWrapper(a) + b;
  }

  public static LinearExpr operator+(Variable a, Variable b)
  {
    return new VarWrapper(a) + new VarWrapper(b);
  }

  public static LinearExpr operator+(LinearExpr a, Variable b)
  {
    return a + new VarWrapper(b);
  }

  public static LinearExpr operator-(Variable a, double v)
  {
    return new VarWrapper(a) - v;
  }

  public static LinearExpr operator-(double v, Variable a)
  {
    return v - new VarWrapper(a);
  }

  public static LinearExpr operator-(Variable a, LinearExpr b)
  {
    return new VarWrapper(a) - b;
  }

  public static LinearExpr operator-(LinearExpr a, Variable b)
  {
    return a - new VarWrapper(b);
  }

  public static LinearExpr operator-(Variable a, Variable b)
  {
    return new VarWrapper(a) - new VarWrapper(b);
  }

  public static LinearExpr operator-(Variable a)
  {
    return - new VarWrapper(a);
  }

  public static LinearExpr operator*(Variable a, double v)
  {
    return new VarWrapper(a) * v;
  }

  public static LinearExpr operator/(Variable a, double v)
  {
    return new VarWrapper(a) / v;
  }

  public static LinearExpr operator*(double v, Variable a)
  {
    return v * new VarWrapper(a);
  }

  public static RangeConstraint operator==(Variable a, double v)
  {
    return new VarWrapper(a) == v;
  }

  public static RangeConstraint operator==(double v, Variable a)
  {
    return v == new VarWrapper(a);
  }

  public static RangeConstraint operator!=(Variable a, double v)
  {
    return new VarWrapper(a) != v;
  }

  public static RangeConstraint operator!=(double v, Variable a)
  {
    return new VarWrapper(a) != v;
  }

  public static Equality operator==(Variable a, LinearExpr b)
  {
    return new VarWrapper(a) == b;
  }

  public static Equality operator==(LinearExpr a, Variable b)
  {
    return a == new VarWrapper(b);
  }

  public static VarEquality operator==(Variable a, Variable b)
  {
    return new VarEquality(a, b, true);
  }

  public static Equality operator!=(Variable a, LinearExpr b)
  {
    return new VarWrapper(a) != b;
  }

  public static Equality operator!=(LinearExpr a, Variable b)
  {
    return a != new VarWrapper(b);
  }

  public static VarEquality operator!=(Variable a, Variable b)
  {
    return new VarEquality(a, b, false);
  }

  public static RangeConstraint operator<=(Variable a, double v)
  {
    return new VarWrapper(a) <= v;
  }

  public static RangeConstraint operator>=(Variable a, double v)
  {
    return new VarWrapper(a) >= v;
  }

  public static RangeConstraint operator<=(double v, Variable a)
  {
    return new VarWrapper(a) >= v;
  }

  public static RangeConstraint operator>=(double v, Variable a)
  {
    return new VarWrapper(a) <= v;
  }

  public static RangeConstraint operator<=(Variable a, LinearExpr b)
  {
    return new VarWrapper(a) <= b;
  }

  public static RangeConstraint operator>=(Variable a, LinearExpr b)
  {
    return new VarWrapper(a) >= b;
  }

  public static RangeConstraint operator<=(Variable a, Variable b)
  {
    return new VarWrapper(a) <= new VarWrapper(b);
  }

  public static RangeConstraint operator>=(Variable a, Variable b)
  {
    return new VarWrapper(a) >= new VarWrapper(b);
  }

  public static RangeConstraint operator<=(LinearExpr a, Variable b)
  {
    return a <= new VarWrapper(b);
  }

  public static RangeConstraint operator>=(LinearExpr a, Variable b)
  {
    return a >= new VarWrapper(b);
  }
}

}  // namespace Google.OrTools.LinearSolver