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//
// Copyright (C) 2006-2016 Talend Inc. - www.talend.com
//
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// %InstallDIR%\features\org.talend.rcp.branding.%PRODUCTNAME%\%PRODUCTNAME%license.txt
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// along with this program; if not, write to Talend SA
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package org.talend.dataquality.statistics.numeric.summary;

import java.util.List;

import org.apache.commons.lang.NotImplementedException;
import org.talend.daikon.number.BigDecimalParser;
import org.talend.dataquality.common.inference.Analyzer;
import org.talend.dataquality.common.inference.ResizableList;
import org.talend.dataquality.statistics.numeric.NumericalStatisticsAnalyzer;
import org.talend.dataquality.statistics.type.DataTypeEnum;
import org.talend.dataquality.statistics.type.TypeInferenceUtils;

/**
 * Analyzer for summary statistics using apache common match library.
 * 
 * @author zhao
 *
 */
public class SummaryAnalyzer extends NumericalStatisticsAnalyzer<SummaryStatistics> {

    private static final long serialVersionUID = 8369753525474844077L;

    private final ResizableList<SummaryStatistics> summaryStats = new ResizableList<>(SummaryStatistics.class);

    public SummaryAnalyzer(DataTypeEnum[] types) {
        super(types);
    }

    @Override
    public void init() {
        super.init();
        summaryStats.clear();
    }

    @Override
    public boolean analyze(String... record) {
        DataTypeEnum[] types = getTypes();

        if (record.length != types.length)
            throw new IllegalArgumentException("Each column of the record should be declared a DataType.Type corresponding! \n"
                    + types.length + " type(s) declared in this summary analyzer but " + record.length
                    + " column(s) was found in this record. \n"
                    + "Using method: setTypes(DataType.Type[] types) to set the types.");

        summaryStats.resize(record.length);

        for (int idx : this.getStatColIdx()) {// analysis each numerical column in the record
            if (!TypeInferenceUtils.isValid(types[idx], record[idx])) {
                continue;
            }
            final SummaryStatistics stats = summaryStats.get(idx);
            try {
                stats.addData(BigDecimalParser.toBigDecimal(record[idx]).doubleValue());
            } catch (NumberFormatException e) {
                continue;
            }
        }
        return true;

    }

    @Override
    public void end() {

    }

    @Override
    public List<SummaryStatistics> getResult() {
        return summaryStats;
    }

    @Override
    public Analyzer<SummaryStatistics> merge(Analyzer<SummaryStatistics> another) {
        throw new NotImplementedException();
    }

}