/*
 *                    BioJava development code
 *
 * This code may be freely distributed and modified under the
 * terms of the GNU Lesser General Public Licence.  This should
 * be distributed with the code.  If you do not have a copy,
 * see:
 *
 *      http://www.gnu.org/copyleft/lesser.html
 *
 * Copyright for this code is held jointly by the individual
 * authors.  These should be listed in @author doc comments.
 *
 * For more information on the BioJava project and its aims,
 * or to join the biojava-l mailing list, visit the home page
 * at:
 *
 *      http://www.biojava.org/
 *
 * Created on 01-21-2010
 *
 * @author Richard Holland
 * @author Scooter Willis
 * @author Paolo Pavan
 *
 */
package org.biojava.nbio.core.sequence.template;

import org.biojava.nbio.core.exceptions.CompoundNotFoundException;
import org.biojava.nbio.core.sequence.AccessionID;
import org.biojava.nbio.core.sequence.DataSource;
import org.biojava.nbio.core.sequence.Strand;
import org.biojava.nbio.core.sequence.TaxonomyID;
import org.biojava.nbio.core.sequence.features.*;
import org.biojava.nbio.core.sequence.loader.UniprotProxySequenceReader;
import org.biojava.nbio.core.sequence.location.SequenceLocation;
import org.biojava.nbio.core.sequence.location.SimpleLocation;
import org.biojava.nbio.core.sequence.location.template.Location;
import org.biojava.nbio.core.sequence.reference.AbstractReference;
import org.biojava.nbio.core.sequence.storage.ArrayListSequenceReader;
import org.biojava.nbio.core.util.Equals;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.*;

/**
 *
 * The base class for DNA, RNA and Protein sequences.
 * @param <C>
 */
public abstract class AbstractSequence<C extends Compound> implements Sequence<C> {

        private final static Logger logger = LoggerFactory.getLogger(AbstractSequence.class);

        private TaxonomyID taxonomy;
        private AccessionID accession;
        private SequenceReader<C> sequenceStorage = null;
        private CompoundSet<C> compoundSet;
        private AnnotationType annotationType = AnnotationType.UNKNOWN;
        private String description;
        private String originalHeader;
        private Collection<Object> userCollection;
        private Integer bioBegin = null;
        private Integer bioEnd = null;
        private AbstractSequence<?> parentSequence = null;
        private String source = null;
        private ArrayList<String> notesList = new ArrayList<String>();
        private Double sequenceScore = null;
        private FeaturesKeyWordInterface featuresKeyWord = null;
        private DatabaseReferenceInterface databaseReferences = null;
        private FeatureRetriever featureRetriever = null;
        private ArrayList<FeatureInterface<AbstractSequence<C>, C>> features =
                        new ArrayList<FeatureInterface<AbstractSequence<C>, C>>();
        private LinkedHashMap<String, ArrayList<FeatureInterface<AbstractSequence<C>, C>>> groupedFeatures =
                        new LinkedHashMap<String, ArrayList<FeatureInterface<AbstractSequence<C>, C>>>();
        private List<String> comments = new ArrayList<>();
        private List<AbstractReference> references;

        public AbstractSequence() {
        }

        /**
         * Create a Sequence from a simple string where the values should be found in compoundSet
         * @param seqString
         * @param compoundSet
         * @throws CompoundNotFoundException
         */
        public AbstractSequence(String seqString, CompoundSet<C> compoundSet) throws CompoundNotFoundException {
                setCompoundSet(compoundSet);
                sequenceStorage = new ArrayListSequenceReader<C>();
                sequenceStorage.setCompoundSet(this.getCompoundSet());
                sequenceStorage.setContents(seqString);
        }

        /**
         * A ProxySequenceReader allows abstraction of both the storage of the sequence data and the location
         * of the sequence data. A variety of use cases are possible. A ProxySequenceReader that knows the offset and of the sequence in
         * a large fasta file. A ProxySequenceReader that can pull Sequence data from UniProt, NCBI or a custom database.
         * If the ProxySequenceReader implements various interfaces then the sequence will set those interfaces so that calls to
         * various methods will be valid.
         *
         * @param proxyLoader
         * @param compoundSet
         */
        public AbstractSequence(SequenceReader<C> proxyLoader, CompoundSet<C> compoundSet) {
                setCompoundSet(compoundSet);
                setProxySequenceReader(proxyLoader);
        }

        /**
         * Very important method that allows external mappings of sequence data and features. This method
         * will gain additional interface inspection that allows external data sources with knowledge
         * of features for a sequence to be supported.
         *
         * @param proxyLoader
         */
        public void setProxySequenceReader(SequenceReader<C> proxyLoader) {
                this.sequenceStorage = proxyLoader;
                if (proxyLoader instanceof FeaturesKeyWordInterface) {
                        this.setFeaturesKeyWord((FeaturesKeyWordInterface) sequenceStorage);
                }
                if (proxyLoader instanceof DatabaseReferenceInterface) {
                        this.setDatabaseReferences((DatabaseReferenceInterface) sequenceStorage);
                }

                if (proxyLoader instanceof FeatureRetriever) {
                        this.setFeatureRetriever((FeatureRetriever) sequenceStorage);
                        HashMap<String, ArrayList<AbstractFeature>> ff = getFeatureRetriever().getFeatures();
                        for (String k: ff.keySet()){
                                for (AbstractFeature f: ff.get(k)){
                                        this.addFeature(f);
                                }
                        }
                        // success of next statement guaranteed because source is a compulsory field
                        //DBReferenceInfo dbQualifier = (DBReferenceInfo)ff.get("source").get(0).getQualifiers().get("db_xref");
                        ArrayList<DBReferenceInfo> dbQualifiers = (ArrayList)ff.get("source").get(0).getQualifiers().get("db_xref");
                        DBReferenceInfo dbQualifier = dbQualifiers.get(0);

                        if (dbQualifier != null) this.setTaxonomy(new TaxonomyID(dbQualifier.getDatabase()+":"+dbQualifier.getId(), DataSource.UNKNOWN));
                }

                if(getAccession() == null && proxyLoader instanceof UniprotProxySequenceReader){ // we have lots of unsupported operations for this call so quick fix to allow this tow rork
                        this.setAccession(proxyLoader.getAccession());
                }
        }

        public SequenceReader<C> getProxySequenceReader() {
                return sequenceStorage;
        }

        /**
         * @return the bioBegin
         */
        public Integer getBioBegin() {
                if (bioBegin == null) {
                        return 1;
                } else {
                        return bioBegin;
                }
        }

        /**
         * @param bioBegin the bioBegin to set
         */
        public void setBioBegin(Integer bioBegin) {
                this.bioBegin = bioBegin;
        }

        /**
         * @return the bioEnd
         */
        public Integer getBioEnd() {
                if (bioEnd == null) {
                        return this.getLength();
                } else {
                        return bioEnd;
                }
        }

        /**
         * @param bioEnd the bioEnd to set
         */
        public void setBioEnd(Integer bioEnd) {
                this.bioEnd = bioEnd;
        }

        /**
         * Provided for convince if the developer needs to associate data with a sequence
         *
         * @return
         */
        public Collection<Object> getUserCollection() {

                return userCollection;
        }

        /**
         *
         * @param userCollection
         */
        public void setUserCollection(Collection<Object> userCollection) {
                this.userCollection = userCollection;
        }

        /**
         * @return the annotation
         */
        public AnnotationType getAnnotationType() {
                return annotationType;
        }

        /**
         * @param annotationType the annotation to set
         */
        public void setAnnotationType(AnnotationType annotationType) {
                this.annotationType = annotationType;
        }

        /**
         * @return the description
         */
        public String getDescription() {
                return description;
        }

        /**
         * @param description the description to set
         */
        public void setDescription(String description) {
                this.description = description;
        }

        /**
         * @return the originalHeader
         */
        public String getOriginalHeader() {
                return originalHeader;
        }

        /**
         * @param originalHeader the originalHeader to set
         */
        public void setOriginalHeader(String originalHeader) {
                this.originalHeader = originalHeader;
        }

        /**
         * @return the parentSequence
         */
        public AbstractSequence<?> getParentSequence() {
                return parentSequence;
        }

        /**
         * @param parentSequence the parentSequence to set
         */
        public void setParentSequence(AbstractSequence<?> parentSequence) {
                this.parentSequence = parentSequence;
        }

        /**
         * Added support for the source of this sequence for GFF3 export
         * If a sub sequence doesn't have  source then check for parent source
         * @return the source
         */
        public String getSource() {
                if (source != null) {
                        return source;
                }
                if (parentSequence != null) {
                        return parentSequence.getSource();
                }
                return null;
        }

        /**
         * Added support for the source of this sequence for GFF3 export
         * @param source the source to set
         */
        public void setSource(String source) {

                this.source = source;
        }

        /**
         * Add notes about this sequence that will get exported for GFF3
         * @param note
         */
        public void addNote(String note) {
                notesList.add(note);
        }

        public void removeNote(String note) {
                notesList.remove(note);
        }

        /**
         * @return the notesList
         */
        public ArrayList<String> getNotesList() {
                return notesList;
        }

        /**
         * @param notesList the notesList to set
         */
        public void setNotesList(ArrayList<String> notesList) {
                this.notesList = notesList;
        }

        /**
         * Provide place holder for a metric that indicate a score associated with the sequence
         * @return the sequenceScore
         */
        public Double getSequenceScore() {
                return sequenceScore;
        }

        /**
         * @param sequenceScore the sequenceScore to set
         */
        public void setSequenceScore(Double sequenceScore) {
                this.sequenceScore = sequenceScore;
        }

        /**
     * @since 5.0.0
         * @return the list of {@link AbstractReference}
         */
        public List<AbstractReference> getReferences() {
                return references;
        }

        /**
         * Set the list of {@link AbstractReference}
     * @since 5.0.0
         * @param references
         */
        public void setReferences(List<AbstractReference> references) {
                this.references = references;
        }

        /**
         * Return features at a sequence position by type
         * @param featureType
         * @param bioSequencePosition
         * @return
         */
        public List<FeatureInterface<AbstractSequence<C>, C>> getFeatures(String featureType, int bioSequencePosition) {
                ArrayList<FeatureInterface<AbstractSequence<C>, C>> featureHits =
                                new ArrayList<FeatureInterface<AbstractSequence<C>, C>>();
                List<FeatureInterface<AbstractSequence<C>, C>> features = getFeaturesByType(featureType);
                if (features != null) {
                        for (FeatureInterface<AbstractSequence<C>, C> feature : features) {
                                if (bioSequencePosition >= feature.getLocations().getStart().getPosition() && bioSequencePosition <= feature.getLocations().getEnd().getPosition()) {
                                        featureHits.add(feature);
                                }
                        }
                }
                return featureHits;
        }

        /**
         * Return features at a sequence position
         * @param bioSequencePosition
         * @return
         */
        public List<FeatureInterface<AbstractSequence<C>, C>> getFeatures(int bioSequencePosition) {
                ArrayList<FeatureInterface<AbstractSequence<C>, C>> featureHits =
                                new ArrayList<FeatureInterface<AbstractSequence<C>, C>>();
                if (features != null) {
                        for (FeatureInterface<AbstractSequence<C>, C> feature : features) {
                                if (bioSequencePosition >= feature.getLocations().getStart().getPosition() && bioSequencePosition <= feature.getLocations().getEnd().getPosition()) {
                                        featureHits.add(feature);
                                }
                        }
                }
                return featureHits;
        }

        /**
         *
         * @return
         */
        public List<FeatureInterface<AbstractSequence<C>, C>> getFeatures() {
                return features;
        }

        /**
         * Method to help set the proper details for a feature as it relates to a sequence
         * where the feature needs to have a location on the sequence
         * @param bioStart
         * @param bioEnd
         * @param feature
         */
        public void addFeature(int bioStart, int bioEnd, FeatureInterface<AbstractSequence<C>, C> feature) {
                SequenceLocation<AbstractSequence<C>, C> sequenceLocation =
                                new SequenceLocation<AbstractSequence<C>, C>(bioStart, bioEnd, this);
                feature.setLocation(sequenceLocation);
                addFeature(feature);
        }

        /**
         * Add a feature to this sequence. The feature will be added to the collection where the order is start position and if more than
         * one feature at the same start position then longest is added first. This helps on doing feature layout for displaying features
         * in SequenceFeaturePanel
         * @param feature
         */
        public void addFeature(FeatureInterface<AbstractSequence<C>, C> feature) {
                features.add(feature);
                ArrayList<FeatureInterface<AbstractSequence<C>, C>> featureList = groupedFeatures.get(feature.getType());
                if (featureList == null) {
                        featureList = new ArrayList<FeatureInterface<AbstractSequence<C>, C>>();
                        groupedFeatures.put(feature.getType(), featureList);
                }
                featureList.add(feature);
                Collections.sort(features, AbstractFeature.LOCATION_LENGTH);
                Collections.sort(featureList, AbstractFeature.LOCATION_LENGTH);
        }

        /**
         * Remove a feature from the sequence
         * @param feature
         */
        public void removeFeature(FeatureInterface<AbstractSequence<C>, C> feature) {
                features.remove(feature);
                ArrayList<FeatureInterface<AbstractSequence<C>, C>> featureList = groupedFeatures.get(feature.getType());
                if (featureList != null) {
                        featureList.remove(feature);
                        if (featureList.isEmpty()) {
                                groupedFeatures.remove(feature.getType());
                        }
                }
        }

        /**
         *
         * @param type
         * @return
         */
        public List<FeatureInterface<AbstractSequence<C>, C>> getFeaturesByType(String type) {
                List<FeatureInterface<AbstractSequence<C>, C>> features = groupedFeatures.get(type);
                if (features == null) {
                        features = new ArrayList<FeatureInterface<AbstractSequence<C>, C>>();
                }
                return features;
        }

        /**
         *
         * @return comments
         */
        public List<String> getComments() {
                return comments;
        }

        /**
         * Set comments.
         * @param comments
         */
        public void setComments(List<String> comments) {
                this.comments = comments;
        }

        /**
         * @return the featuresKeyWord
         */
        public FeaturesKeyWordInterface getFeaturesKeyWord() {
                return featuresKeyWord;
        }

        /**
         * @param featuresKeyWord the featuresKeyWord to set
         */
        public void setFeaturesKeyWord(FeaturesKeyWordInterface featuresKeyWord) {
                this.featuresKeyWord = featuresKeyWord;
        }

        /**
         * @return the databaseReferences
         */
        public DatabaseReferenceInterface getDatabaseReferences() {
                return databaseReferences;
        }

        /**
         * @param databaseReferences the databaseReferences to set
         */
        public void setDatabaseReferences(DatabaseReferenceInterface databaseReferences) {
                this.databaseReferences = databaseReferences;
        }

        public FeatureRetriever getFeatureRetriever() {
                return featureRetriever;
        }

        public void setFeatureRetriever(FeatureRetriever featureRetriever) {
                this.featureRetriever = featureRetriever;
        }



        public enum AnnotationType {

                CURATED, PREDICTED, UNKNOWN;
        }

        /**
         * @return the accession
         */
        @Override
        public AccessionID getAccession() {
                return accession;
        }

        /**
         * @param accession the accession to set
         */
        public void setAccession(AccessionID accession) {
                this.accession = accession;
        }

        /**
         * @return the species
         */
        public TaxonomyID getTaxonomy() {
                return taxonomy;
        }

        /**
         * @param taxonomy the species to set
         */
        public void setTaxonomy(TaxonomyID taxonomy) {
                this.taxonomy = taxonomy;
        }

        @Override
        public CompoundSet<C> getCompoundSet() {
                if (compoundSet != null) {
                        return compoundSet;
                }
                // This is invalid since the parentSequence isn't guaranteed to have the same compound set as this sequence,
                // e.g., the case where the parent sequence for a protein is a CDS.
                /*
                if (parentSequence != null) {
                        return parentSequence.getCompoundSet();
                }
                */
                return null;


        }

        public void setCompoundSet(CompoundSet<C> compoundSet) {
                this.compoundSet = compoundSet;
        }

        @Override
        public boolean equals(Object o){

                if(! Equals.classEqual(this, o)) {
                        return false;
                }

                Sequence<C> other = (Sequence<C>)o;

                if ( other.getCompoundSet() != getCompoundSet())
                        return false;


                List<C> rawCompounds = getAsList();
                List<C> otherCompounds = other.getAsList();

                if ( rawCompounds.size() != otherCompounds.size())
                        return false;

                for (int i = 0 ; i < rawCompounds.size() ; i++){
                        Compound myCompound = rawCompounds.get(i);
                        Compound otherCompound = otherCompounds.get(i);
                        if ( ! myCompound.equalsIgnoreCase(otherCompound))
                                return false;
                }
                return true;
        }

        @Override
        public int hashCode(){
                String s = getSequenceAsString();
                return s.hashCode();
        }

        @Override
        public String toString() {
                return getSequenceAsString();
        }

        private SequenceReader<C> getSequenceStorage() {
                if (sequenceStorage != null) {
                        return sequenceStorage;
                }
                if (parentSequence != null) {

                        //return parentSequence.getSequenceStorage();

                        if ( this.compoundSet.equals(parentSequence.getCompoundSet())){
                                sequenceStorage = new ArrayListSequenceReader<C>();
                                sequenceStorage.setCompoundSet(this.getCompoundSet());
                                try {
                                        sequenceStorage.setContents(parentSequence.getSequenceAsString());
                                } catch (CompoundNotFoundException e) {
                                        // TODO is there a better way to handle this exception?
                                        logger.error("Problem setting contents from parent sequence, some unrecognised compound: {}",e.getMessage());
                                }
                                return sequenceStorage;
                        }

                }

                return null;
        }

        /**
         *
         * @param bioStart
         * @param bioEnd
         * @param strand
         * @return
         */
        public String getSequenceAsString(Integer bioStart, Integer bioEnd, Strand strand) {

                Location loc = new SimpleLocation(bioStart, bioEnd, strand);
                return loc.getSubSequence(this).getSequenceAsString();
        }

        /**
         * Default case is to assume strand is positive because only CDSSequence can be either positive or negative Strand.
         * @return
         */
        @Override
        public String getSequenceAsString() {
                return SequenceMixin.toString(this);

        }

        /**
         *
         * @return
         */
        @Override
        public List<C> getAsList() {

                return sequenceStorage.getAsList();
        }

        /**
         *
         * @param position The 1-indexed position of the amino acid
         * @return
         */
        @Override
        public C getCompoundAt(int position) {

                return getSequenceStorage().getCompoundAt(position);
        }

        /**
         *
         * @param compound
         * @return The first index of compound in this sequence (1-based)
         */
        @Override
        public int getIndexOf(C compound) {
                return getSequenceStorage().getIndexOf(compound);
        }

        /**
         *
         * @param compound
         * @return The last index of compound in this sequence (1-based)
         */
        @Override
        public int getLastIndexOf(C compound) {
                return getSequenceStorage().getLastIndexOf(compound);
        }

        /**
         *
         * @return
         */
        @Override
        public int getLength() {
                return getSequenceStorage().getLength();
        }

        /**
         *
         * @param bioStart
         * @param bioEnd
         * @return
         */
        @Override
        public SequenceView<C> getSubSequence(final Integer bioStart, final Integer bioEnd) {
                return new SequenceProxyView<C>(this, bioStart, bioEnd);
        }

        /**
         *
         * @return
         */
        @Override
        public Iterator<C> iterator() {
                return getSequenceStorage().iterator();
        }

        /**
         *
         * @param compounds
         * @return
         */
        @Override
        public int countCompounds(C... compounds) {
                return SequenceMixin.countCompounds(this, compounds);
        }

        /**
         *
         * @return
         */
        @Override
        public SequenceView<C> getInverse() {
                return SequenceMixin.inverse(this);
        }


}