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package com.google.refine.operations.recon;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.refine.browsing.EngineConfig;
import com.google.refine.browsing.RowVisitor;
import com.google.refine.history.Change;
import com.google.refine.model.Cell;
import com.google.refine.model.Column;
import com.google.refine.model.Project;
import com.google.refine.model.Recon;
import com.google.refine.model.Recon.Judgment;
import com.google.refine.model.ReconCandidate;
import com.google.refine.model.Row;
import com.google.refine.model.changes.CellChange;
import com.google.refine.model.changes.ReconChange;
import com.google.refine.operations.EngineDependentMassCellOperation;

public class ReconMatchSpecificTopicOperation extends EngineDependentMassCellOperation {
    
    public static class ReconItem {
        @JsonProperty("id")
        public final String id; 
        @JsonProperty("name")
        public final String name;
        @JsonProperty("types")
        public final String[] types;
        @JsonCreator
        public ReconItem(
                @JsonProperty("id") String id,
                @JsonProperty("name") String name,
                @JsonProperty("types") String[] types) {
            this.id = id;
            this.name = name;
            this.types = types;
        }
        
        @JsonIgnore
        public ReconCandidate getCandidate() {
            return new ReconCandidate(id, name, types, 100);
        }
    }
    
    @JsonProperty("match")
    final protected ReconItem match;
    @JsonProperty("identifierSpace")
    final protected String identifierSpace;
    @JsonProperty("schemaSpace")
    final protected String schemaSpace;

    @JsonCreator
    public ReconMatchSpecificTopicOperation(
        @JsonProperty("engineConfig")
        EngineConfig engineConfig, 
        @JsonProperty("columnName")
        String columnName, 
        @JsonProperty("match")
        ReconItem match,
        @JsonProperty("identifierSpace")
        String identifierSpace,
        @JsonProperty("schemaSpace")
        String schemaSpace
    ) {
        super(engineConfig, columnName, false);
        this.match = match;
        this.identifierSpace = identifierSpace;
        this.schemaSpace = schemaSpace;
    }
    
    @Override
    protected String getBriefDescription(Project project) {
        return "Match specific item " +
            match.name + " (" + 
            match.id + ") to cells in column " + _columnName;
    }

    @Override
    protected String createDescription(Column column,
            List<CellChange> cellChanges) {
        return "Match specific item " + 
            match.name + " (" + 
            match.id + ") to " + cellChanges.size() + 
            " cells in column " + column.getName();
    }

    @Override
    protected RowVisitor createRowVisitor(Project project, List<CellChange> cellChanges, long historyEntryID) throws Exception {
        Column column = project.columnModel.getColumnByName(_columnName);
        ReconCandidate candidate = match.getCandidate();
        
        return new RowVisitor() {
            int cellIndex;
            List<CellChange> cellChanges;
            Map<Long, Recon> dupReconMap = new HashMap<Long, Recon>();
            long historyEntryID;
            
            public RowVisitor init(int cellIndex, List<CellChange> cellChanges, long historyEntryID) {
                this.cellIndex = cellIndex;
                this.cellChanges = cellChanges;
                this.historyEntryID = historyEntryID;
                return this;
            }
            
            @Override
            public void start(Project project) {
                // nothing to do
            }

            @Override
            public void end(Project project) {
                // nothing to do
            }

            @Override
            public boolean visit(Project project, int rowIndex, Row row) {
                Cell cell = row.getCell(cellIndex);
                if (cell != null) {
                    long reconID = cell.recon != null ? cell.recon.id : 0;
                    
                    Recon newRecon;
                    if (dupReconMap.containsKey(reconID)) {
                        newRecon = dupReconMap.get(reconID);
                        newRecon.judgmentBatchSize++;
                    } else {
                        newRecon = cell.recon != null ? 
                            cell.recon.dup(historyEntryID) : 
                            new Recon(
                                historyEntryID,
                                identifierSpace,
                                schemaSpace);
                            
                        newRecon.match = candidate;
                        newRecon.matchRank = -1;
                        newRecon.judgment = Judgment.Matched;
                        newRecon.judgmentAction = "mass";
                        newRecon.judgmentBatchSize = 1;
                        
                        dupReconMap.put(reconID, newRecon);
                    }
                    
                    Cell newCell = new Cell(
                        cell.value,
                        newRecon
                    );
                    
                    CellChange cellChange = new CellChange(rowIndex, cellIndex, cell, newCell);
                    cellChanges.add(cellChange);
                }
                return false;
            }
        }.init(column.getCellIndex(), cellChanges, historyEntryID);
    }
    
    @Override
    protected Change createChange(Project project, Column column, List<CellChange> cellChanges) {
        return new ReconChange(
            cellChanges, 
            _columnName, 
            column.getReconConfig(),
            null
        );
    }
}
