package gudusoft.gsqlparser.dlineage.dataflow.model;

import java.util.ArrayList;
import java.util.List;

import gudusoft.gsqlparser.ESqlClause;
import gudusoft.gsqlparser.TSourceToken;
import gudusoft.gsqlparser.dlineage.util.Pair3;
import gudusoft.gsqlparser.nodes.TObjectName;
import gudusoft.gsqlparser.nodes.TParseTreeNode;
import gudusoft.gsqlparser.util.SQLUtil;

public class ResultColumnRelationshipElement implements
                RelationshipElement<ResultColumn>
{

        private ResultColumn column;

        private TObjectName columnName;

        private ESqlClause relationLocation;

        private int starIndex = -1;

        // Where THIS relation referenced the column (e.g. the operand in an ON or
        // WHERE clause). A derived table's / CTE's ResultColumn model carries its
        // select-list definition span, so it cannot hold the per-reference
        // coordinate. Null when unknown or synthesized. Deliberately excluded from
        // equals/hashCode.
        private Pair3<Long, Long, String> referenceStartPosition;

        private Pair3<Long, Long, String> referenceEndPosition;

        // The column is a star whose members' order is unknown, read at a position (an INSERT column list), so no
        // member can be told to be the one at that position: the relation reads the star itself (Mantis 4856).
        // Deliberately excluded from equals/hashCode.
        private boolean positionUnproven;

    private List<Transform> transforms = new ArrayList<Transform>();

        public ResultColumnRelationshipElement(ResultColumn column)
        {
                this.column = column;
        }
        
        public ResultColumnRelationshipElement(ResultColumn column, int starIndex )
        {
                this.column = column;
                this.starIndex = starIndex;
        }
        
        public ResultColumnRelationshipElement(ResultColumn column, TObjectName columnName) {
                this.column = column;
                this.columnName = columnName;
        }

        public ResultColumnRelationshipElement(ResultColumn column,
                                                                                   ESqlClause relationLocation )
        {
                this.column = column;
                this.relationLocation = relationLocation;
        }

        public ResultColumnRelationshipElement(ResultColumn column, ESqlClause relationLocation,
                        TObjectName referenceObject)
        {
                this(column, relationLocation);
                setReferencePosition(referenceObject);
        }

        /**
         * Records the span of the object name this relation was built from, so the
         * serialized source can point at the reference site (the ON/WHERE operand)
         * instead of the result column's select-list definition span. Ignores
         * synthesized object names, which have no real source token (their tokens
         * sit at line 1, column 1).
         */
        public void setReferencePosition(TObjectName referenceObject) {
                if (referenceObject == null || referenceObject.getStartToken() == null
                                || referenceObject.getEndToken() == null) {
                        return;
                }
                TSourceToken startToken = referenceObject.getStartToken();
                TSourceToken endToken = referenceObject.getEndToken();
                if (startToken.lineNo <= 0 || (startToken.lineNo == 1 && startToken.columnNo == 1)) {
                        return;
                }
                this.referenceStartPosition = new Pair3<Long, Long, String>(startToken.lineNo, startToken.columnNo,
                                ModelBindingManager.getGlobalHash());
                this.referenceEndPosition = new Pair3<Long, Long, String>(endToken.lineNo,
                                endToken.columnNo + SQLUtil.endTrim(endToken.getAstext()).length(),
                                ModelBindingManager.getGlobalHash());
        }

        public Pair3<Long, Long, String> getReferenceStartPosition() {
                return referenceStartPosition;
        }

        public Pair3<Long, Long, String> getReferenceEndPosition() {
                return referenceEndPosition;
        }

        @Override
        public ResultColumn getElement( )
        {
                return column;
        }

        public ESqlClause getRelationLocation( )
        {
                return relationLocation;
        }


        public TObjectName getColumnName() {
                return columnName;
        }

        @Override
        public int hashCode( )
        {
                final int prime = 31;
                int result = 1;
                result = prime
                                * result
                                + ( ( column == null ) ? 0 : column.hashCode( ) );
                result = prime
                                * result
                                + ( ( relationLocation == null ) ? 0
                                                : relationLocation.hashCode( ) );
                return result;
        }

        @Override
        public boolean equals( Object obj )
        {
                if ( this == obj )
                        return true;
                if ( obj == null )
                        return false;
                if ( getClass( ) != obj.getClass( ) )
                        return false;
                ResultColumnRelationshipElement other = (ResultColumnRelationshipElement) obj;
                if ( column == null )
                {
                        if ( other.column != null )
                                return false;
                }
                else if ( !column.equals( other.column ) )
                        return false;
                if ( relationLocation != other.relationLocation )
                        return false;
                return true;
        }
        
        @Override
        public List<Transform> getTransforms() {
                return transforms;
        }
        
        public void addTransform(String type, TParseTreeNode code) {
                if (ModelBindingManager.getGlobalOption()!=null && !ModelBindingManager.getGlobalOption().isTransform()) {
                        return;
                }
                Transform transform = new Transform();
                transform.setType(type);
                transform.setCode(code);
                transforms.add(transform);
        }

        public int getStarIndex() {
                return starIndex;
        }

        public boolean isPositionUnproven() {
                return positionUnproven;
        }

        public void setPositionUnproven(boolean positionUnproven) {
                this.positionUnproven = positionUnproven;
        }

        public void setStarIndex(int starIndex) {
                this.starIndex = starIndex;
        }

}