#pragma region CPL License
/*
Nuclex Native Framework
Copyright (C) 2002-2015 Nuclex Development Labs

This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.

This library 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
IBM Common Public License for more details.

You should have received a copy of the IBM Common Public
License along with this library
*/
#pragma endregion // CPL License

// If the library is compiled as a DLL, this ensures symbols are exported
#define NUCLEX_GEOMETRY_SOURCE 1

#include "Nuclex/Geometry/Lines/Tracers/Line2Tracer.h"
#include <gtest/gtest.h>

namespace Nuclex { namespace Geometry { namespace Lines { namespace Tracers {

  // ------------------------------------------------------------------------------------------- //

  TEST(Line2TracerTest, CrossingOfPerpendicularVerticalLineIsDetected) {
    Line2<float> obstacle(Point2<float>(0.0f, -1.0f), Vector2<float>::Up);
    Line2<float> runner(Point2<float>(-10.0f, 1.0f), Vector2<float>::Right);

    LineContacts<float> contacts = Line2Tracer<float>::FindLineContacts(
      runner, obstacle
    );

    EXPECT_EQ(10.0f, contacts.EntryTime);
    EXPECT_EQ(10.0f, contacts.ExitTime);
  }

  // ------------------------------------------------------------------------------------------- //

  TEST(Line2TracerTest, CrossingOfPerpendicularHorizontalLineIsDetected) {
    Line2<float> obstacle(Point2<float>(-1.0f, 0.0f), Vector2<float>::Right);
    Line2<float> runner(Point2<float>(1.0f, -10.0f), Vector2<float>::Up);

    LineContacts<float> contacts = Line2Tracer<float>::FindLineContacts(
      runner, obstacle
    );

    EXPECT_EQ(10.0f, contacts.EntryTime);
    EXPECT_EQ(10.0f, contacts.ExitTime);
  }

  // ------------------------------------------------------------------------------------------- //

  TEST(Line2TracerTest, IntersectionBeforeOriginIsDetected) {
    Line2<float> obstacle(
      Point2<float>(4.0f, -2.0f), Vector2<float>::Normalize(Vector2<float>(-1.0f, 1.0f))
    );
    Line2<float> runner(
      Point2<float>(12.0f, 10.0f), Vector2<float>::Normalize(Vector2<float>(1.0f, 1.0f))
    );

    LineContacts<float> contacts = Line2Tracer<float>::FindLineContacts(
      runner, obstacle
    );

    float expectedContactTime = -sqrtf(10 * 10 + 10 * 10);
    EXPECT_FLOAT_EQ(expectedContactTime, contacts.EntryTime);
    EXPECT_FLOAT_EQ(expectedContactTime, contacts.ExitTime);
  }

  // ------------------------------------------------------------------------------------------- //

}}}} // namespace Nuclex::Geometry::Lines::Tracers