package org.simantics.district.network.ui.table;

import java.util.Set;

import org.eclipse.nebula.widgets.nattable.NatTable;
import org.eclipse.nebula.widgets.nattable.coordinate.Range;
import org.eclipse.nebula.widgets.nattable.ui.action.IKeyAction;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.events.KeyEvent;

public class CustomPasteDataAction implements IKeyAction {

    private DistrictCSVTable table;

    public CustomPasteDataAction(DistrictCSVTable table) {
        this.table = table;
    }

    @Override
    public void run(NatTable natTable, KeyEvent event) {
        Object data = table.cpb.getContents(TextTransfer.getInstance());
        if (data instanceof String) {
            String textData = (String) data;
            String[][] fullData = computeData(textData);
            
            int[] cols = table.selectionLayer.getSelectedColumnPositions();
            int firstCol = cols[0];
            int column = table.selectionLayer.getColumnIndexByPosition(firstCol);
            Set<Range> ranges = table.selectionLayer.getSelectedRowPositions();
            if (!ranges.isEmpty()) {
                int rowPosition = ranges.iterator().next().start;
                int[] columns = new int[fullData.length];
                columns[0] = column;
                for (int i = 1; i < fullData.length; i++)
                    columns[i] = table.selectionLayer.getColumnIndexByPosition(firstCol + i);
                table.bodyDataLayer.doCommand(new CustomPasteDataCommand(table.bodyDataLayer, columns, rowPosition, fullData));
            }
        }
    }
    
    private static String[][] computeData(String textData) {
        String separator;
        if (textData.contains(",") && !textData.contains(";")) {
            separator = ",";
        } else if (textData.contains(";") && !textData.contains("\t")) {
            separator = ";";
        } else {
            separator = "\\t";
        }
        
        textData = textData.replaceAll("\\r", "");
         
        String[] rows = textData.split("\\n");
        
        String[][] cells = new String[rows.length][];
        for(int i=0;i<rows.length;++i)
            cells[i] = rows[i].split(separator, -1);
        
        String[][] fullData = cells; //transpose(cells);
        
        return fullData;
    }
    
    private static String[][] transpose(String[][] cells) {
        int rowCount = 0;
        for(String[] cols : cells)
            rowCount = Math.max(rowCount, cols.length);
        String[][] result = new String[rowCount][cells.length];
        for(int i=0;i<cells.length;++i) {
            String[] cols = cells[i];
            int j;
            for(j=0;j<cols.length;++j)
                result[j][i] = cols[j];
            for(;j<rowCount;++j)
                result[j][i] = "";
        }
        return result;

    }
}