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package prerna.reactor.frame.r;

import java.util.List;
import java.util.Vector;

import prerna.ds.OwlTemporalEngineMeta;
import prerna.ds.r.RDataTable;
import prerna.sablecc2.om.GenRowStruct;
import prerna.sablecc2.om.PixelDataType;
import prerna.sablecc2.om.PixelOperationType;
import prerna.sablecc2.om.ReactorKeysEnum;
import prerna.sablecc2.om.nounmeta.NounMetadata;
import prerna.sablecc2.om.nounmeta.RemoveHeaderNounMetadata;
import prerna.util.usertracking.AnalyticsTrackerHelper;
import prerna.util.usertracking.UserTrackerFactory;

public class DropColumnReactor extends AbstractRFrameReactor {

	/**
	 * This reactor drops columns from the frame. The inputs to the reactor are:
	 * 1) list of columns to drop
	 */
	
	public DropColumnReactor() {
		this.keysToGet = new String[]{ReactorKeysEnum.COLUMNS.getKey()};
	}

	@Override
	public NounMetadata execute() {
		// initialize rJavaTranslator
		init();
		// get frame
		RDataTable frame = (RDataTable) getFrame();
		OwlTemporalEngineMeta metaData = this.getFrame().getMetaData();

		// get table name
		String table = frame.getName();

		// store the list of names being removed
		List remCols = new Vector();
		
		// get inputs
		List columns = getColumns();
		StringBuilder builder = new StringBuilder();
		for (int i = 0; i < columns.size(); i++) {
			String col = columns.get(i);
			if (col.contains("__")) {
				String[] split = col.split("__");
				col = split[1];
				table = split[0];
			}
			// define the script to be executed
			builder.append(table + " <- " + table + "[," + col + ":=NULL];");
			remCols.add(col);

			String dataType = metaData.getHeaderTypeAsString(table + "__" + col);
			if(dataType == null)
				return getWarning("Frame is out of sync / No Such Column. Cannot perform this operation");
			
			metaData.dropProperty(table + "__" + col, table);
			// drop filters with this column
			frame.getFrameFilters().removeColumnFilter(col);
		}

		// run the script
		this.rJavaTranslator.runR(builder.toString());
		this.addExecutedCode(builder.toString());

		// reset the frame headers
		frame.syncHeaders();
		
		// NEW TRACKING
		UserTrackerFactory.getInstance().trackAnalyticsWidget(
				this.insight, 
				frame, 
				"DropColumn", 
				AnalyticsTrackerHelper.getHashInputs(this.store, this.keysToGet));
		
		NounMetadata retNoun = new NounMetadata(frame, PixelDataType.FRAME, PixelOperationType.FRAME_HEADERS_CHANGE, PixelOperationType.FRAME_DATA_CHANGE);
		retNoun.addAdditionalReturn(new RemoveHeaderNounMetadata(remCols));
		return retNoun;
	}

	//////////////////////////////////////////////////////////////////////
	//////////////////////////////////////////////////////////////////////
	///////////////////////// GET PIXEL INPUT ////////////////////////////
	//////////////////////////////////////////////////////////////////////
	//////////////////////////////////////////////////////////////////////
	
	private List getColumns() {
		List columns = new Vector();

		GenRowStruct colGrs = this.store.getNoun(this.keysToGet[0]);
		if (colGrs != null && !colGrs.isEmpty()) {
			for (int selectIndex = 0; selectIndex < colGrs.size(); selectIndex++) {
				String column = colGrs.get(selectIndex) + "";
				columns.add(column);
			}
		} else {
			GenRowStruct inputsGRS = this.getCurRow();
			// keep track of selectors to change to upper case
			if (inputsGRS != null && !inputsGRS.isEmpty()) {
				for (int selectIndex = 0; selectIndex < inputsGRS.size(); selectIndex++) {
					String column = inputsGRS.get(selectIndex) + "";
					columns.add(column);
				}
			}
		}

		return columns;
	}
}