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 // This file is part of the ACTS project.
 //
 // Copyright (C) 2016 CERN for the benefit of the ACTS project
 //
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
 #pragma once
 
 #include "Acts/Definitions/Algebra.hpp"
 #include "Acts/Surfaces/BoundaryTolerance.hpp"
 #include "Acts/Surfaces/PlanarBounds.hpp"
 #include "Acts/Surfaces/RectangleBounds.hpp"
 #include "Acts/Surfaces/SurfaceBounds.hpp"
 
 #include <array>
 #include <iosfwd>
 #include <vector>
 
 namespace Acts {
 
 /// @class TrapezoidBounds
 ///
 /// Bounds for a trapezoidal, planar Surface.
 ///
 /// @image html TrapezoidBounds.gif
 ///
 /// @todo can be speed optimized by calculating kappa/delta and caching it
 class TrapezoidBounds : public PlanarBounds {
  public:
   enum BoundValues {
     eHalfLengthXnegY = 0,
     eHalfLengthXposY = 1,
     eHalfLengthY = 2,
     eRotationAngle = 3,
     eSize = 4
   };
 
   /// Constructor for symmetric Trapezoid
   ///
   /// @param halfXnegY minimal half length X, definition at negative Y
   /// @param halfXposY maximal half length X, definition at positive Y
   /// @param halfY half length Y - defined at x=0
   /// @param rotAngle: rotation angle of the bounds w.r.t coordinate axes
   explicit TrapezoidBounds(double halfXnegY, double halfXposY, double halfY,
                            double rotAngle = 0.) noexcept(false);
 
   /// Constructor for symmetric Trapezoid - from fixed size array
   ///
   /// @param values the values to be stream in
   explicit TrapezoidBounds(const std::array<double, eSize>& values) noexcept(
       false);
 
   BoundsType type() const final { return SurfaceBounds::eTrapezoid; }
 
   std::vector<double> values() const final;
 
   /// The orientation of the Trapezoid is according to the figure above,
   /// in words: the shorter of the two parallel sides of the trapezoid
   /// intersects
   /// with the negative @f$ y @f$ - axis of the local frame.
   ///
   /// <br>
   /// The cases are:<br>
   /// (0) @f$ y @f$ or @f$ x @f$ bounds are 0 || 0<br>
   /// (1) the local position is outside @f$ y @f$ bounds <br>
   /// (2) the local position is inside @f$ y @f$ bounds, but outside maximum @f$
   /// x
   /// @f$ bounds  <br>
   /// (3) the local position is inside @f$ y @f$ bounds AND inside minimum @f$ x
   /// @f$ bounds <br>
   /// (4) the local position is inside @f$ y @f$ bounds AND inside maximum @f$ x
   /// @f$ bounds, so that it depends on the @f$ eta @f$ coordinate
   /// (5) the local position fails test of (4) <br>
   ///
   /// The inside check is done using single equations of straight lines and one
   /// has
   /// to take care if a point
   /// lies on the positive @f$ x @f$ half area(I) or the negative one(II).
   /// Denoting
   /// @f$ |x_{min}| @f$ and
   /// @f$ | x_{max} | @f$ as \c minHalfX respectively \c maxHalfX, such as @f$ |
   /// y_{H} | @f$ as \c halfY,
   /// the equations for the straing lines in (I) and (II) can be written as:<br>
   ///  <br>
   /// - (I):  @f$ y = \kappa_{I} x + \delta_{I} @f$ <br>
   /// - (II): @f$ y = \kappa_{II} x + \delta_{II} @f$ ,<br>
   ///  <br>
   /// where @f$  \kappa_{I} = - \kappa_{II} = 2 \frac{y_{H}}{x_{max} - x_{min}}
   /// @f$
   /// <br>
   /// and   @f$  \delta_{I} = \delta_{II} = - \frac{1}{2}\kappa_{I}(x_{max} +
   /// x_{min}) @f$
   ///
   /// @param lposition Local position (assumed to be in right surface frame)
   /// @param boundaryTolerance boundary check directive
   ///
   /// @return boolean indicator for the success of this operation
   bool inside(const Vector2& lposition,
               const BoundaryTolerance& boundaryTolerance) const final;
 
   /// Return the vertices
   ///
   /// @param ignoredSegments is and ignored parameter used to describe
   /// the number of segments to approximate curved sectors.
   ///
   /// @note the number of segments is ignored in this representation
   ///
   /// @return vector for vertices in 2D
   std::vector<Vector2> vertices(unsigned int ignoredSegments = 0u) const final;
 
   // Bounding box representation
   const RectangleBounds& boundingBox() const final;
 
   /// Output Method for std::ostream
   ///
   /// @param sl is the ostream to be dumped into
   std::ostream& toStream(std::ostream& sl) const final;
 
   /// Access to the bound values
   /// @param bValue the class nested enum for the array access
   double get(BoundValues bValue) const { return m_values[bValue]; }
 
  private:
   std::array<double, eSize> m_values;
   RectangleBounds m_boundingBox;
 
   void rotateBoundingBox() noexcept(false);
 
   /// Check the input values for consistency, will throw a logic_exception
   /// if consistency is not given
   void checkConsistency() noexcept(false);
 };
 
 }  // namespace Acts

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