package com.megatim.apifdxweb.core.impl.helper;

import com.megatim.apifdxweb.core.ifaces.helper.FileDataReader;
import com.megatim.apifdxweb.core.ifaces.integration.ColumnDefinitionManager;
import com.megatim.fdxcommons.core.impl.tools.CommonUtilities;
import com.megatim.fdxcommons.model.integration.ColumnDefinition;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.enterprise.context.Dependent;
import javax.inject.Inject;
import java.nio.charset.Charset;
import java.util.LinkedHashMap;

/**
 *
 * @author lenovo
 */
@Dependent
public class FileDataReaderImpl implements FileDataReader {

    @Inject
    private ColumnDefinitionManager columnDefinitionManager;

    @Override
    public List<LinkedHashMap<String, Object>> getDatas(String referentielVersion, String codeTypeFichier, File dataFile) throws Exception {
        List<LinkedHashMap<String, Object>> datas = new ArrayList<>();
        List<ColumnDefinition> columnsDefinition = columnDefinitionManager.findByReferentielAndTypeFichier(referentielVersion, codeTypeFichier);

        //Ranger les olonnes par ordre croissant de position
        Collections.sort(columnsDefinition, (ColumnDefinition c1, ColumnDefinition c2) -> Integer.valueOf(c1.getPosition()).compareTo(c2.getPosition()));

        //On détermine l'encodage du fichier
        Charset charset = CommonUtilities.getCharset(dataFile);

        try ( FileInputStream fis = new FileInputStream(dataFile);  InputStreamReader isr = new InputStreamReader(fis, charset);  BufferedReader reader = new BufferedReader(isr)) {
            String line;
            while ((line = reader.readLine()) != null) {
                LinkedHashMap<String, Object> dataLine = getLine(line, columnsDefinition);
                datas.add(dataLine);
            }
        }

        return datas;
    }

    private LinkedHashMap<String, Object> getLine(final String line, final List<ColumnDefinition> columnsDefinition) {
        LinkedHashMap<String, Object> dataLine = new LinkedHashMap<>();
        int index = 0;

        for (ColumnDefinition c : columnsDefinition) {

            //traitement des colonnes du type fichier
            String data = line.substring(index, index + c.getTaille());
            dataLine.put(c.getName(), data);

            index += c.getTaille();
        }

        return dataLine;

    }

}