content: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * 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.
   */
  
  package androidx.constraintlayout.core;
  
  /**
   * Represents a goal to minimize
   */
  public class OptimizedGoal extends OriginalGoal {
  
      static int sMAX = 6;
  
      final LinearSystem mSystem;
  
      public OptimizedGoal(LinearSystem system) {
          mSystem = system;
      }
  
      public SolverVariable getPivotCandidate() {
          final int count = mSystem.mNumColumns;
          SolverVariable candidate = null;
          int strength = 0;
          for (int i = 1; i < count; i++) {
              SolverVariable element = mSystem.mCache.mIndexedVariables[i];
              if (element.mType != SolverVariable.Type.ERROR) {
                  continue;
              }
              for (int k = sMAX - 1; k >= 0; k--) {
                  float value = element.mStrengthVector[k];
                  if (candidate == null && value < 0 && (k >= strength)) {
                      strength = k;
                      candidate = element;
  //                    System.out.println("-> k: " + k + " strength: " + strength
  //                    + " v: " + value + " candidate " + candidate);
                  }
                  if (value > 0 && k > strength) {
  //                    System.out.println("-> reset, k: " + k + " strength: " + strength
  //                    + " v: " + value + " candidate " + candidate);
                      strength = k;
                      candidate = null;
                  }
              }
          }
          return candidate;
      }
  
      public void updateFromSystemErrors(LinearSystem system) {
          for (int i = 1; i < system.mVariablesID; i++) {
              SolverVariable variable = system.mCache.mIndexedVariables[i];
              if (variable.mType != SolverVariable.Type.ERROR) {
                  continue;
              }
              for (int j = 0; j < sMAX; j++) {
                  variable.mStrengthVector[j] = 0;
              }
              variable.mStrengthVector[variable.strength] = 1;
          }
      }
  
      public void updateFromSystem(LinearSystem system) {
          updateFromSystemErrors(system);
          final int count = system.mNumColumns;
          for (int i = 1; i < count; i++) {
              SolverVariable element = system.mCache.mIndexedVariables[i];
              if (element.mDefinitionId != -1) {
                  ArrayRow definition = system.getRow(element.mDefinitionId);
                  ArrayLinkedVariables variables =
                          (ArrayLinkedVariables) (Object) definition.variables;
                  int size = variables.mCurrentSize;
                  for (int j = 0; j < size; j++) {
                      SolverVariable var = variables.getVariable(j);
                      float value = variables.getVariableValue(j);
  //                    add(element, var, value);
                      for (int k = 0; k < sMAX; k++) {
                          var.mStrengthVector[k] += element.mStrengthVector[k] * value;
                      }
                  }
              }
          }
  //        variables.clear();
  //        initFromSystemErrors(system);
  //        final int count = variables.size();
  //        for (int i = 0; i < count; i++) {
  //            GoalElement element = variables.get(i);
  //            if (element.variable.definitionId != -1) {
  //                ArrayRow definition = system.getRow(element.variable.definitionId);
  //                ArrayLinkedVariables variables = definition.variables;
  //                int size = variables.currentSize;
  //                for (int j = 0; j < size; j++) {
  //                    SolverVariable var = variables.getVariable(j);
  //                    float value = variables.getVariableValue(j);
  //                    add(element, var, value);
  //                }
  //                element.clearStrengths();
  //            }
  //        }
      }
  
      public String toString() {
          String representation = "OriginalGoal: ";
          for (int i = 1; i < mSystem.mNumColumns; i++) {
              SolverVariable variable = mSystem.mCache.mIndexedVariables[i];
              if (variable.mType != SolverVariable.Type.ERROR) {
                  continue;
              }
              representation += variable + "[";
              for (int j = 0; j < variable.mStrengthVector.length; j++) {
                  representation += variable.mStrengthVector[j];
                  if (j < variable.mStrengthVector.length - 1) {
                      representation += ", ";
                  } else {
                      representation += "], ";
                  }
              }
          }
          return representation;
      }
  
  }
  