// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2023 Google Inc. All rights reserved.
// http://ceres-solver.org/
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// Author: sameeragarwal@google.com (Sameer Agarwal)

#include "ceres/function_sample.h"

#include "absl/strings/str_format.h"

namespace ceres::internal {

FunctionSample::FunctionSample()
    : x(0.0),
      vector_x_is_valid(false),
      value(0.0),
      value_is_valid(false),
      vector_gradient_is_valid(false),
      gradient(0.0),
      gradient_is_valid(false) {}

FunctionSample::FunctionSample(const double x, const double value)
    : x(x),
      vector_x_is_valid(false),
      value(value),
      value_is_valid(true),
      vector_gradient_is_valid(false),
      gradient(0.0),
      gradient_is_valid(false) {}

FunctionSample::FunctionSample(const double x,
                               const double value,
                               const double gradient)
    : x(x),
      vector_x_is_valid(false),
      value(value),
      value_is_valid(true),
      vector_gradient_is_valid(false),
      gradient(gradient),
      gradient_is_valid(true) {}

std::string FunctionSample::ToDebugString() const {
  return absl::StrFormat(
      "[x: %.8e, value: %.8e, gradient: %.8e, "
      "value_is_valid: %d, gradient_is_valid: %d]",
      x,
      value,
      gradient,
      value_is_valid,
      gradient_is_valid);
}

}  // namespace ceres::internal