package com.metaweb.gridworks.operations;

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

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;

import com.metaweb.gridworks.browsing.RowVisitor;
import com.metaweb.gridworks.expr.ExpressionUtils;
import com.metaweb.gridworks.history.Change;
import com.metaweb.gridworks.model.AbstractOperation;
import com.metaweb.gridworks.model.Cell;
import com.metaweb.gridworks.model.Column;
import com.metaweb.gridworks.model.Project;
import com.metaweb.gridworks.model.Recon;
import com.metaweb.gridworks.model.ReconCandidate;
import com.metaweb.gridworks.model.Row;
import com.metaweb.gridworks.model.Recon.Judgment;
import com.metaweb.gridworks.model.changes.CellChange;
import com.metaweb.gridworks.model.changes.ReconChange;

public class ReconJudgeSimilarCellsOperation extends EngineDependentMassCellOperation {
    final protected String           _similarValue;
    final protected Judgment         _judgment;
    final protected ReconCandidate   _match;
    final protected boolean          _shareNewTopics;

    static public AbstractOperation reconstruct(Project project, JSONObject obj) throws Exception {
        JSONObject engineConfig = obj.getJSONObject("engineConfig");
        
        ReconCandidate match = null;
        if (obj.has("match")) {
            JSONObject matchObj = obj.getJSONObject("match");
            
            JSONArray types = matchObj.getJSONArray("types");
            String[] typeIDs = new String[types.length()];
            for (int i = 0; i < typeIDs.length; i++) {
                typeIDs[i] = types.getString(i);
            }
            
            match = new ReconCandidate(
                matchObj.getString("id"),
                matchObj.getString("guid"),
                matchObj.getString("name"),
                typeIDs,
                matchObj.getDouble("score")
            );
        }
        
        Judgment judgment = Judgment.None;
        if (obj.has("judgment")) {
            judgment = Recon.stringToJudgment(obj.getString("judgment"));
        }
        
        return new ReconJudgeSimilarCellsOperation(
            engineConfig,
            obj.getString("columnName"),
            obj.getString("similarValue"),
            judgment,
            match,
            obj.has("shareNewTopics") ? obj.getBoolean("shareNewTopics") : false
        );
    }
    
    public ReconJudgeSimilarCellsOperation(
        JSONObject         engineConfig, 
        String             columnName, 
        String             similarValue,
        Judgment        judgment,
        ReconCandidate     match,
        boolean            shareNewTopics
    ) {
        super(engineConfig, columnName, false);
        this._similarValue = similarValue;
        this._judgment = judgment;
        this._match = match;
        this._shareNewTopics = shareNewTopics;
    }

    public void write(JSONWriter writer, Properties options)
            throws JSONException {
        
        writer.object();
        writer.key("op"); writer.value(OperationRegistry.s_opClassToName.get(this.getClass()));
        writer.key("description"); writer.value(getBriefDescription(null));
        writer.key("engineConfig"); writer.value(getEngineConfig());
        writer.key("columnName"); writer.value(_columnName);
        writer.key("similarValue"); writer.value(_similarValue);
        writer.key("judgment"); writer.value(Recon.judgmentToString(_judgment));
        if (_match != null) {
            writer.key("match"); _match.write(writer, options);
        }
        writer.key("shareNewTopics"); writer.value(_shareNewTopics);
        
        writer.endObject();
    }
    
    protected String getBriefDescription(Project project) {
        if (_judgment == Judgment.None) {
            return "Discard recon judgments for cells containing \"" +
                _similarValue + "\" in column " + _columnName;
        } else if (_judgment == Judgment.New) {
            if (_shareNewTopics) {
                return "Mark to create one single new topic for all cells containing \"" +
                    _similarValue + "\" in column " + _columnName;
            } else {
                return "Mark to create one new topic for each cell containing \"" +
                    _similarValue + "\" in column " + _columnName;
            }
        } else if (_judgment == Judgment.Matched) {
            return "Match topic " + 
                _match.topicName +  " (" +
                _match.topicID + ") for cells containing \"" +
                _similarValue + "\" in column " + _columnName;
        }
        throw new InternalError("Can't get here");
    }

    protected String createDescription(Column column,
            List<CellChange> cellChanges) {
        
        if (_judgment == Judgment.None) {
            return "Discard recon judgments for " + cellChanges.size() + " cells containing \"" +
                _similarValue + "\" in column " + _columnName;
        } else if (_judgment == Judgment.New) {
            if (_shareNewTopics) {
                return "Mark to create one single new topic for " + cellChanges.size() + " cells containing \"" +
                    _similarValue + "\" in column " + _columnName;
            } else {
                return "Mark to create one new topic for each of " + cellChanges.size() + " cells containing \"" +
                    _similarValue + "\" in column " + _columnName;
            }
        } else if (_judgment == Judgment.Matched) {
            return "Match topic " + 
                _match.topicName + " (" +
                _match.topicID + ") for " +
                cellChanges.size() + " cells containing \"" +
                _similarValue + "\" in column " + _columnName;
        }
        throw new InternalError("Can't get here");
    }

    protected RowVisitor createRowVisitor(Project project, List<CellChange> cellChanges) throws Exception {
        Column column = project.columnModel.getColumnByName(_columnName);
        
        return new RowVisitor() {
            int                 _cellIndex;
            List<CellChange>     _cellChanges;
            Map<String, Recon>  _sharedRecons = new HashMap<String, Recon>();
            
            public RowVisitor init(int cellIndex, List<CellChange> cellChanges) {
                _cellIndex = cellIndex;
                _cellChanges = cellChanges;
                return this;
            }
            
            public boolean visit(Project project, int rowIndex, Row row, boolean includeContextual, boolean includeDependent) {
                Cell cell = row.getCell(_cellIndex);
                if (cell != null && 
                    ExpressionUtils.isNonBlankData(cell.value) && 
                    _similarValue.equals(cell.value)) {
                    
                    Recon recon = null;
                    if (_judgment == Judgment.New && _shareNewTopics) {
                        String s = cell.value.toString();
                        if (_sharedRecons.containsKey(s)) {
                            recon = _sharedRecons.get(s);
                        } else {
                            recon = new Recon();
                            recon.judgment = Judgment.New;
                            
                            _sharedRecons.put(s, recon);
                        }
                    } else {
                        recon = cell.recon == null ? new Recon() : cell.recon.dup();
                        if (_judgment == Judgment.Matched) {
                            recon.judgment = Recon.Judgment.Matched;
                            recon.match = _match;
                        } else if (_judgment == Judgment.New) {
                            recon.judgment = Recon.Judgment.New;
                            recon.match = null;
                        } else if (_judgment == Judgment.None) {
                            recon.judgment = Recon.Judgment.None;
                            recon.match = null;
                        }
                    }
                    
                    Cell newCell = new Cell(cell.value, recon);
                    
                    CellChange cellChange = new CellChange(rowIndex, _cellIndex, cell, newCell);
                    _cellChanges.add(cellChange);
                }
                return false;
            }
        }.init(column.getCellIndex(), cellChanges);
    }
    
    
    protected Change createChange(Project project, Column column, List<CellChange> cellChanges) {
        return new ReconChange(
            cellChanges, 
            _columnName, 
            column.getReconConfig(),
            null
        );
    }
}