/*
    * Copyright (C) 2019 Alberto Irurueta Carro (alberto@irurueta.com)
    *
    * 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 com.irurueta.navigation.indoor.position;
  
  import com.irurueta.geometry.Point2D;
  import com.irurueta.navigation.LockedException;
  import com.irurueta.navigation.indoor.RadioSource;
  import com.irurueta.navigation.indoor.RadioSourceLocated;
  import com.irurueta.navigation.indoor.RangingFingerprint;
  import com.irurueta.navigation.indoor.RangingReading;
  import com.irurueta.navigation.lateration.PROSACRobustLateration2DSolver;
  import com.irurueta.numerical.robust.RobustEstimatorMethod;
  
  import java.util.List;
  
  /**
   * Robustly estimates 2D position using located radio sources and their ranging readings
   * at unknown locations and using PROSAC algorithm to discard outliers.
   * This kind of estimator can be used to robustly determine the 2D position of a given
   * device by getting ranging readings at an unknown location of different radio sources
   * whose 2D locations are known.
   */
  public class PROSACRobustRangingPositionEstimator2D extends RobustRangingPositionEstimator2D {
  
      /**
       * Quality scores corresponding to each provided located radio source.
       * The larger the score value the better the quality of the radio source.
       */
      private double[] sourceQualityScores;
  
      /**
       * Quality scores corresponding to each reading within provided fingerprint.
       * The larger the score value the better the quality of the reading.
       */
      private double[] fingerprintReadingsQualityScores;
  
      /**
       * Constructor.
       */
      public PROSACRobustRangingPositionEstimator2D() {
          super();
          init();
      }
  
      /**
       * Constructor.
       *
       * @param sources located radio sources used for lateration.
       * @throws IllegalArgumentException if provided sources is null or the number of
       *                                  provided sources is less than the required minimum.
       */
      public PROSACRobustRangingPositionEstimator2D(final List<? extends RadioSourceLocated<Point2D>> sources) {
          super();
          init();
          internalSetSources(sources);
      }
  
      /**
       * Constructor.
       *
       * @param fingerprint fingerprint containing ranging readings at an unknown location
       *                    for provided located radio sources.
       * @throws IllegalArgumentException if provided fingerprint is null.
       */
      public PROSACRobustRangingPositionEstimator2D(
              final RangingFingerprint<? extends RadioSource, ? extends RangingReading<?
                      extends RadioSource>> fingerprint) {
          super();
          init();
          internalSetFingerprint(fingerprint);
      }
  
      /**
       * Constructor.
       *
       * @param sources     located radio sources used for lateration.
       * @param fingerprint fingerprint containing ranging readings at an unknown location
       *                    for provided located radio sources.
       * @throws IllegalArgumentException if either provided sources or fingerprint is null
       *                                  or the number of provided sources is less than the required minimum.
       */
      public PROSACRobustRangingPositionEstimator2D(
              final List<? extends RadioSourceLocated<Point2D>> sources,
              final RangingFingerprint<? extends RadioSource, ? extends RangingReading<?
                      extends RadioSource>> fingerprint) {
          super();
         init();
         internalSetSources(sources);
         internalSetFingerprint(fingerprint);
     }
 
     /**
      * Constructor.
      *
      * @param listener listener in charge of handling events.
      */
     public PROSACRobustRangingPositionEstimator2D(final RobustRangingPositionEstimatorListener<Point2D> listener) {
         super(listener);
         init();
     }
 
     /**
      * Constructor.
      *
      * @param sources  located radio sources used for lateration.
      * @param listener listener in charge of handling events.
      * @throws IllegalArgumentException if provided sources is null or the number of
      *                                  provided sources is less than the required minimum.
      */
     public PROSACRobustRangingPositionEstimator2D(
             final List<? extends RadioSourceLocated<Point2D>> sources,
             final RobustRangingPositionEstimatorListener<Point2D> listener) {
         super(listener);
         init();
         internalSetSources(sources);
     }
 
     /**
      * Constructor.
      *
      * @param fingerprint fingerprint containing ranging readings at an unknown location
      *                    for provided location radio sources.
      * @param listener    listener in charge of handling events.
      * @throws IllegalArgumentException if provided fingerprint is null.
      */
     public PROSACRobustRangingPositionEstimator2D(
             final RangingFingerprint<? extends RadioSource, ? extends RangingReading<?
                     extends RadioSource>> fingerprint,
             final RobustRangingPositionEstimatorListener<Point2D> listener) {
         super(listener);
         init();
         internalSetFingerprint(fingerprint);
     }
 
     /**
      * Constructor.
      *
      * @param sources     located radio sources used for lateration.
      * @param fingerprint fingerprint containing ranging readings at an unknown location
      *                    for provided located radio sources.
      * @param listener    listener in charge of handling events.
      * @throws IllegalArgumentException if either provided sources or fingerprint is
      *                                  null or the number of provided sources is less than the required minimum.
      */
     public PROSACRobustRangingPositionEstimator2D(
             final List<? extends RadioSourceLocated<Point2D>> sources,
             final RangingFingerprint<? extends RadioSource, ? extends RangingReading<?
                     extends RadioSource>> fingerprint,
             final RobustRangingPositionEstimatorListener<Point2D> listener) {
         super(listener);
         init();
         internalSetSources(sources);
         internalSetFingerprint(fingerprint);
     }
 
     /**
      * Constructor.
      *
      * @param sourceQualityScores             quality scores corresponding to
      *                                        each provided located radio source.
      *                                        The larger the score value the better
      *                                        the quality of the radio source.
      * @param fingerprintReadingQualityScores quality scores corresponding to readings
      *                                        within provided fingerprint. The larger
      *                                        the score the better the quality of the
      *                                        reading.
      */
     public PROSACRobustRangingPositionEstimator2D(
             final double[] sourceQualityScores, final double[] fingerprintReadingQualityScores) {
         this();
         internalSetSourceQualityScores(sourceQualityScores);
         internalSetFingerprintReadingsQualityScores(fingerprintReadingQualityScores);
     }
 
     /**
      * Constructor.
      *
      * @param sourceQualityScores             quality scores corresponding to
      *                                        each provided located radio source.
      *                                        The larger the score value the better
      *                                        the quality of the radio source.
      * @param fingerprintReadingQualityScores quality scores corresponding to readings
      *                                        within provided fingerprint. The larger
      *                                        the score the better the quality of the
      *                                        reading.
      * @param sources                         located radio sources used for
      *                                        lateration.
      * @throws IllegalArgumentException if provided sources is null or the number of
      *                                  provided sources is less than the required minimum.
      */
     public PROSACRobustRangingPositionEstimator2D(
             final double[] sourceQualityScores, final double[] fingerprintReadingQualityScores,
             final List<? extends RadioSourceLocated<Point2D>> sources) {
         this(sources);
         internalSetSourceQualityScores(sourceQualityScores);
         internalSetFingerprintReadingsQualityScores(fingerprintReadingQualityScores);
     }
 
     /**
      * Constructor.
      *
      * @param sourceQualityScores             quality scores corresponding to
      *                                        each provided located radio source.
      *                                        The larger the score value the better
      *                                        the quality of the radio source.
      * @param fingerprintReadingQualityScores quality scores corresponding to readings
      *                                        within provided fingerprint. The larger
      *                                        the score the better the quality of the
      *                                        reading.
      * @param fingerprint                     fingerprint containing ranging readings at
      *                                        an unknown location for provided located
      *                                        radio sources.
      * @throws IllegalArgumentException if provided fingerprint is null.
      */
     public PROSACRobustRangingPositionEstimator2D(
             final double[] sourceQualityScores, final double[] fingerprintReadingQualityScores,
             final RangingFingerprint<? extends RadioSource, ? extends RangingReading<?
                     extends RadioSource>> fingerprint) {
         this(fingerprint);
         internalSetSourceQualityScores(sourceQualityScores);
         internalSetFingerprintReadingsQualityScores(fingerprintReadingQualityScores);
     }
 
     /**
      * Constructor.
      *
      * @param sourceQualityScores             quality scores corresponding to
      *                                        each provided located radio source.
      *                                        The larger the score value the better
      *                                        the quality of the radio source.
      * @param fingerprintReadingQualityScores quality scores corresponding to readings
      *                                        within provided fingerprint. The larger
      *                                        the score the better the quality of the
      *                                        reading.
      * @param sources                         located radio sources used for
      *                                        lateration.
      * @param fingerprint                     fingerprint containing ranging readings at
      *                                        an unknown location for provided located
      *                                        radio sources.
      * @throws IllegalArgumentException if either provided sources or fingerprint is null
      *                                  or the number of provided sources is less than the required minimum.
      */
     public PROSACRobustRangingPositionEstimator2D(
             final double[] sourceQualityScores, final double[] fingerprintReadingQualityScores,
             final List<? extends RadioSourceLocated<Point2D>> sources,
             final RangingFingerprint<? extends RadioSource, ? extends RangingReading<?
                     extends RadioSource>> fingerprint) {
         this(sources, fingerprint);
         internalSetSourceQualityScores(sourceQualityScores);
         internalSetFingerprintReadingsQualityScores(fingerprintReadingQualityScores);
     }
 
     /**
      * Constructor.
      *
      * @param sourceQualityScores             quality scores corresponding to
      *                                        each provided located radio source.
      *                                        The larger the score value the better
      *                                        the quality of the radio source.
      * @param fingerprintReadingQualityScores quality scores corresponding to readings
      *                                        within provided fingerprint. The larger
      *                                        the score the better the quality of the
      *                                        reading.
      * @param listener                        listener in charge of handling events.
      */
     public PROSACRobustRangingPositionEstimator2D(
             final double[] sourceQualityScores, final double[] fingerprintReadingQualityScores,
             final RobustRangingPositionEstimatorListener<Point2D> listener) {
         this(listener);
         internalSetSourceQualityScores(sourceQualityScores);
         internalSetFingerprintReadingsQualityScores(fingerprintReadingQualityScores);
     }
 
     /**
      * Constructor.
      *
      * @param sourceQualityScores             quality scores corresponding to
      *                                        each provided located radio source.
      *                                        The larger the score value the better
      *                                        the quality of the radio source.
      * @param fingerprintReadingQualityScores quality scores corresponding to readings
      *                                        within provided fingerprint. The larger
      *                                        the score the better the quality of the
      *                                        reading.
      * @param sources                         located radio sources used for
      *                                        lateration.
      * @param listener                        listener in charge of handling events.
      * @throws IllegalArgumentException if provided sources is null or the number of
      *                                  provided sources is less than the required minimum.
      */
     public PROSACRobustRangingPositionEstimator2D(
             final double[] sourceQualityScores, final double[] fingerprintReadingQualityScores,
             final List<? extends RadioSourceLocated<Point2D>> sources,
             final RobustRangingPositionEstimatorListener<Point2D> listener) {
         this(sources, listener);
         internalSetSourceQualityScores(sourceQualityScores);
         internalSetFingerprintReadingsQualityScores(fingerprintReadingQualityScores);
     }
 
     /**
      * Constructor.
      *
      * @param sourceQualityScores             quality scores corresponding to
      *                                        each provided located radio source.
      *                                        The larger the score value the better
      *                                        the quality of the radio source.
      * @param fingerprintReadingQualityScores quality scores corresponding to readings
      *                                        within provided fingerprint. The larger
      *                                        the score the better the quality of the
      *                                        reading.
      * @param fingerprint                     fingerprint containing ranging readings
      *                                        at an unknown location for provided
      *                                        location radio sources.
      * @param listener                        listener in charge of handling events.
      * @throws IllegalArgumentException if provided fingerprint is null.
      */
     public PROSACRobustRangingPositionEstimator2D(
             final double[] sourceQualityScores, final double[] fingerprintReadingQualityScores,
             final RangingFingerprint<? extends RadioSource, ? extends RangingReading<?
                     extends RadioSource>> fingerprint,
             final RobustRangingPositionEstimatorListener<Point2D> listener) {
         this(fingerprint, listener);
         internalSetSourceQualityScores(sourceQualityScores);
         internalSetFingerprintReadingsQualityScores(fingerprintReadingQualityScores);
     }
 
     /**
      * Constructor.
      *
      * @param sourceQualityScores             quality scores corresponding to
      *                                        each provided located radio source.
      *                                        The larger the score value the better
      *                                        the quality of the radio source.
      * @param fingerprintReadingQualityScores quality scores corresponding to readings
      *                                        within provided fingerprint. The larger
      *                                        the score the better the quality of the
      *                                        reading.
      * @param sources                         located radio sources used for
      *                                        lateration.
      * @param fingerprint                     fingerprint containing ranging readings
      *                                        at an unknown location for provided
      *                                        located radio sources.
      * @param listener                        listener in charge of handling events.
      * @throws IllegalArgumentException if either provided sources or fingerprint is
      *                                  null or the number of provided sources is less than the required minimum.
      */
     public PROSACRobustRangingPositionEstimator2D(
             final double[] sourceQualityScores, final double[] fingerprintReadingQualityScores,
             final List<? extends RadioSourceLocated<Point2D>> sources,
             final RangingFingerprint<? extends RadioSource, ? extends RangingReading<?
                     extends RadioSource>> fingerprint,
             final RobustRangingPositionEstimatorListener<Point2D> listener) {
         this(sources, fingerprint, listener);
         internalSetSourceQualityScores(sourceQualityScores);
         internalSetFingerprintReadingsQualityScores(fingerprintReadingQualityScores);
     }
 
     /**
      * Returns quality scores corresponding to each radio source.
      * The larger the score value the better the quality of the sample.
      *
      * @return quality scores corresponding to each radio source.
      */
     @Override
     public double[] getSourceQualityScores() {
         return sourceQualityScores;
     }
 
     /**
      * Sets quality scores corresponding to each radio source.
      * The larger the score value the better the quality of the radio source.
      *
      * @param sourceQualityScores quality scores corresponding to each radio source.
      * @throws LockedException          if this instance is locked.
      * @throws IllegalArgumentException if provided quality scores length is smaller
      *                                  than minimum required samples.
      */
     @Override
     public void setSourceQualityScores(final double[] sourceQualityScores) throws LockedException {
         if (isLocked()) {
             throw new LockedException();
         }
         internalSetSourceQualityScores(sourceQualityScores);
     }
 
     /**
      * Gets quality scores corresponding to each reading within provided fingerprint.
      * The larger the score value the better the quality of the reading.
      * This implementation always returns null.
      * Subclasses using quality scores must implement proper behavior.
      *
      * @return quality scores corresponding to each reading within provided
      * fingerprint.
      */
     @Override
     public double[] getFingerprintReadingsQualityScores() {
         return fingerprintReadingsQualityScores;
     }
 
     /**
      * Sets quality scores corresponding to each reading within provided fingerprint.
      * The larger the score value the better the quality of the reading.
      * This implementation makes no action.
      * Subclasses using quality scores must implement proper behavior.
      *
      * @param fingerprintReadingsQualityScores quality scores corresponding to each
      *                                         reading within provided fingerprint.
      * @throws LockedException          if this instance is locked.
      * @throws IllegalArgumentException if provided quality scores length is smaller
      *                                  than minimum required samples.
      */
     @Override
     public void setFingerprintReadingsQualityScores(final double[] fingerprintReadingsQualityScores)
             throws LockedException {
         if (isLocked()) {
             throw new LockedException();
         }
         internalSetFingerprintReadingsQualityScores(fingerprintReadingsQualityScores);
     }
 
     /**
      * Gets threshold to determine whether samples are inliers or not when testing possible solutions.
      * The threshold refers to the amount of error on distance between estimated position and distances
      * provided for each sample.
      *
      * @return threshold to determine whether samples are inliers or not.
      */
     public double getThreshold() {
         return ((PROSACRobustLateration2DSolver) laterationSolver).getThreshold();
     }
 
     /**
      * Sets threshold to determine whether samples are inliers or not when testing possible solutions.
      * The threshold refers to the amount of error on distance between estimated position and distances
      * provided for each sample.
      *
      * @param threshold threshold to determine whether samples are inliers or not.
      * @throws IllegalArgumentException if provided value is equal or less than zero.
      * @throws LockedException          if this solver is locked.
      */
     public void setThreshold(final double threshold) throws LockedException {
         ((PROSACRobustLateration2DSolver) laterationSolver).setThreshold(threshold);
     }
 
     /**
      * Indicates whether inliers must be computed and kept.
      *
      * @return true if inliers must be computed and kept, false if inliers
      * only need to be computed but not kept.
      */
     public boolean isComputeAndKeepInliersEnabled() {
         return ((PROSACRobustLateration2DSolver) laterationSolver).isComputeAndKeepInliersEnabled();
     }
 
     /**
      * Specifies whether inliers must be computed and kept.
      *
      * @param computeAndKeepInliers true if inliers must be computed and kept,
      *                              false if inliers only need to be computed but not kept.
      * @throws LockedException if this solver is locked.
      */
     public void setComputeAndKeepInliersEnabled(final boolean computeAndKeepInliers) throws LockedException {
         ((PROSACRobustLateration2DSolver) laterationSolver).setComputeAndKeepInliersEnabled(computeAndKeepInliers);
     }
 
     /**
      * Indicates whether residuals must be computed and kept.
      *
      * @return true if residuals must be computed and kept, false if residuals
      * only need to be computed but not kept.
      */
     public boolean isComputeAndKeepResidualsEnabled() {
         return ((PROSACRobustLateration2DSolver) laterationSolver).isComputeAndKeepResiduals();
     }
 
     /**
      * Specifies whether residuals must be computed and kept.
      *
      * @param computeAndKeepResiduals true if residuals must be computed and kept,
      *                                false if residuals only need to be computed but not kept.
      * @throws LockedException if this solver is locked.
      */
     public void setComputeAndKeepResidualsEnabled(final boolean computeAndKeepResiduals) throws LockedException {
         ((PROSACRobustLateration2DSolver) laterationSolver).setComputeAndKeepResidualsEnabled(computeAndKeepResiduals);
     }
 
     /**
      * Returns method being used for robust estimation.
      *
      * @return method being used for robust estimation.
      */
     @Override
     public RobustEstimatorMethod getMethod() {
         return RobustEstimatorMethod.PROSAC;
     }
 
     /**
      * Initializes robust lateration solver.
      */
     private void init() {
         laterationSolver = new PROSACRobustLateration2DSolver(trilaterationSolverListener);
     }
 
     /**
      * Sets quality scores corresponding to each provided located radio source.
      * This method is used internally and does not check whether instance is
      * locked or not.
      *
      * @param sourceQualityScores quality scores to be set.
      * @throws IllegalArgumentException if provided quality scores length
      *                                  is smaller than 3 samples.
      */
     private void internalSetSourceQualityScores(final double[] sourceQualityScores) {
         if (sourceQualityScores == null || sourceQualityScores.length < getMinRequiredSources()) {
             throw new IllegalArgumentException();
         }
 
         this.sourceQualityScores = sourceQualityScores;
 
         buildPositionsDistancesDistanceStandardDeviationsAndQualityScores();
     }
 
     /**
      * Sets quality scores corresponding to each provided reading within provided
      * fingerprint.
      * This method is used internally and does not check whether instance is locked
      * or not.
      *
      * @param fingerprintReadingsQualityScores quality scores to be set.
      * @throws IllegalArgumentException if provided quality scores length is
      *                                  smaller than 3 samples.
      */
     private void internalSetFingerprintReadingsQualityScores(final double[] fingerprintReadingsQualityScores) {
         if (fingerprintReadingsQualityScores == null
                 || fingerprintReadingsQualityScores.length < getMinRequiredSources()) {
             throw new IllegalArgumentException();
         }
 
         this.fingerprintReadingsQualityScores = fingerprintReadingsQualityScores;
 
         buildPositionsDistancesDistanceStandardDeviationsAndQualityScores();
     }
 }