// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2015 Google Inc. All rights reserved.
// http://ceres-solver.org/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
// * Neither the name of Google Inc. nor the names of its contributors may be
//   used to endorse or promote products derived from this software without
//   specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// Author: keir@google.com (Keir Mierle)

#include "ceres/minimizer.h"

#include "ceres/iteration_callback.h"
#include "ceres/solver.h"
#include "gtest/gtest.h"

namespace ceres::internal {

class FakeIterationCallback : public IterationCallback {
 public:
  CallbackReturnType operator()(const IterationSummary& summary) final {
    return SOLVER_CONTINUE;
  }
};

TEST(Minimizer, InitializationCopiesCallbacks) {
  FakeIterationCallback callback0;
  FakeIterationCallback callback1;

  Solver::Options solver_options;
  solver_options.callbacks.push_back(&callback0);
  solver_options.callbacks.push_back(&callback1);

  Minimizer::Options minimizer_options(solver_options);
  ASSERT_EQ(2, minimizer_options.callbacks.size());

  EXPECT_EQ(minimizer_options.callbacks[0], &callback0);
  EXPECT_EQ(minimizer_options.callbacks[1], &callback1);
}

class AbortingIterationCallback : public IterationCallback {
 public:
  CallbackReturnType operator()(const IterationSummary& summary) final {
    return SOLVER_ABORT;
  }
};

TEST(Minimizer, UserAbortUpdatesSummaryMessage) {
  AbortingIterationCallback callback;
  Solver::Options solver_options;
  solver_options.callbacks.push_back(&callback);
  Minimizer::Options minimizer_options(solver_options);
  Solver::Summary summary;
  Minimizer::RunCallbacks(minimizer_options, IterationSummary(), &summary);
  EXPECT_EQ(summary.message, "User callback returned SOLVER_ABORT.");
}

class SucceedingIterationCallback : public IterationCallback {
 public:
  CallbackReturnType operator()(const IterationSummary& summary) final {
    return SOLVER_TERMINATE_SUCCESSFULLY;
  }
};

TEST(Minimizer, UserSuccessUpdatesSummaryMessage) {
  SucceedingIterationCallback callback;
  Solver::Options solver_options;
  solver_options.callbacks.push_back(&callback);
  Minimizer::Options minimizer_options(solver_options);
  Solver::Summary summary;
  Minimizer::RunCallbacks(minimizer_options, IterationSummary(), &summary);
  EXPECT_EQ(summary.message,
            "User callback returned SOLVER_TERMINATE_SUCCESSFULLY.");
}

}  // namespace ceres::internal