// 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

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// Author: sameeragarwal@google.com (Sameer Agarwal)

#include "ceres/line_search_minimizer.h"

#include "ceres/minimizer.h"

#include "ceres/trust_region_minimizer.h"

#include "ceres/types.h"

#include "glog/logging.h"

namespace ceres {

namespace internal {

Minimizer* Minimizer::Create(MinimizerType minimizer_type) {

  if (minimizer_type == TRUST_REGION) {

    return new TrustRegionMinimizer;

  }

  if (minimizer_type == LINE_SEARCH) {

    return new LineSearchMinimizer;

  }

  LOG(FATAL) << "Unknown minimizer_type: " << minimizer_type;

  return NULL;

}

Minimizer::~Minimizer() {}

bool Minimizer::RunCallbacks(const Minimizer::Options& options,

                             const IterationSummary& iteration_summary,

                             Solver::Summary* summary) {

  const bool is_not_silent = !options.is_silent;

  CallbackReturnType status = SOLVER_CONTINUE;

  int i = 0;

  while (status == SOLVER_CONTINUE && i < options.callbacks.size()) {

    status = (*options.callbacks[i])(iteration_summary);

    ++i;

  }

  switch (status) {

    case SOLVER_CONTINUE:

      return true;

    case SOLVER_TERMINATE_SUCCESSFULLY:

      summary->termination_type = USER_SUCCESS;

      summary->message =

          "User callback returned SOLVER_TERMINATE_SUCCESSFULLY.";

      VLOG_IF(1, is_not_silent) << "Terminating: " << summary->message;

      return false;

    case SOLVER_ABORT:

      summary->termination_type = USER_FAILURE;

      summary->message = "User callback returned SOLVER_ABORT.";

      VLOG_IF(1, is_not_silent) << "Terminating: " << summary->message;

      return false;

    default:

      LOG(FATAL) << "Unknown type of user callback status";

  }

  return false;

}

}  // namespace internal

}  // namespace ceres