// Copyright 2010-2021 Google LLC
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "ortools/sat/parameters_validation.h"

#include <string>

#include "absl/strings/str_cat.h"
#include "ortools/sat/sat_parameters.pb.h"

namespace operations_research {
namespace sat {

#define TEST_IN_RANGE(name, min, max)                                       \
  if (params.name() < min || params.name() > max) {                         \
    return absl::StrCat("parameter '", #name, "' should be in [", min, ",", \
                        max, "]. Current value is ", params.name());        \
  }

#define TEST_NOT_NAN(name)                                 \
  if (std::isnan(params.name())) {                         \
    return absl::StrCat("parameter '", #name, "' is NaN"); \
  }

std::string ValidateParameters(const SatParameters& params) {
  if (params.max_time_in_seconds() < 0) {
    return "Parameters max_time_in_seconds should be non-negative";
  }

  // Test that all floating point parameters are not NaN.
  TEST_NOT_NAN(random_polarity_ratio);
  TEST_NOT_NAN(random_branches_ratio);
  TEST_NOT_NAN(initial_variables_activity);
  TEST_NOT_NAN(clause_cleanup_ratio);
  TEST_NOT_NAN(pb_cleanup_ratio);
  TEST_NOT_NAN(variable_activity_decay);
  TEST_NOT_NAN(max_variable_activity_value);
  TEST_NOT_NAN(glucose_max_decay);
  TEST_NOT_NAN(glucose_decay_increment);
  TEST_NOT_NAN(clause_activity_decay);
  TEST_NOT_NAN(max_clause_activity_value);
  TEST_NOT_NAN(restart_dl_average_ratio);
  TEST_NOT_NAN(restart_lbd_average_ratio);
  TEST_NOT_NAN(blocking_restart_multiplier);
  TEST_NOT_NAN(strategy_change_increase_ratio);
  TEST_NOT_NAN(max_time_in_seconds);
  TEST_NOT_NAN(max_deterministic_time);
  TEST_NOT_NAN(absolute_gap_limit);
  TEST_NOT_NAN(relative_gap_limit);
  TEST_NOT_NAN(log_frequency_in_seconds);
  TEST_NOT_NAN(presolve_probing_deterministic_time_limit);
  TEST_NOT_NAN(merge_no_overlap_work_limit);
  TEST_NOT_NAN(merge_at_most_one_work_limit);
  TEST_NOT_NAN(min_orthogonality_for_lp_constraints);
  TEST_NOT_NAN(cut_max_active_count_value);
  TEST_NOT_NAN(cut_active_count_decay);
  TEST_NOT_NAN(shaving_search_deterministic_time);
  TEST_NOT_NAN(mip_max_bound);
  TEST_NOT_NAN(mip_var_scaling);
  TEST_NOT_NAN(mip_wanted_precision);
  TEST_NOT_NAN(mip_check_precision);
  TEST_NOT_NAN(mip_max_valid_magnitude);

  // TODO(user): Consider using annotations directly in the proto for these
  // validation. It is however not open sourced.
  TEST_IN_RANGE(mip_max_activity_exponent, 1, 62);
  TEST_IN_RANGE(mip_max_bound, 0, 1e17);
  TEST_IN_RANGE(solution_pool_size, 0, std::numeric_limits<int32_t>::max());

  if (params.enumerate_all_solutions() && params.num_search_workers() > 1) {
    return "Enumerating all solutions does not work in parallel";
  }

  if (params.enumerate_all_solutions() && params.interleave_search()) {
    return "Enumerating all solutions does not work with interleaved search";
  }

  if (params.num_workers() < 0) {
    return "Parameters num_workers must be non-negative";
  }
  if (params.num_search_workers() < 0) {
    return "Parameters num_search_workers must be non-negative";
  }

  return "";
}

#undef TEST_IN_RANGE
#undef TEST_NOT_NAN

}  // namespace sat
}  // namespace operations_research