package net.sourceforge.fenixedu.util.sibs.incomming;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import net.sourceforge.fenixedu.util.Money;

public class SibsIncommingPaymentFile {

    private static final String HEADER_REGISTER_TYPE = "0";

    private static final String DETAIL_REGISTER_TYPE = "2";

    private static final String FOOTER_REGISTER_TYPE = "9";

    private SibsIncommingPaymentFileHeader header;

    private List<SibsIncommingPaymentFileDetailLine> detailLines;

    private SibsIncommingPaymentFileFooter footer;

    private String filename;

    private SibsIncommingPaymentFile(String filename, SibsIncommingPaymentFileHeader header,
	    SibsIncommingPaymentFileFooter footer, List<SibsIncommingPaymentFileDetailLine> detailLines) {
	this.filename = filename;
	this.header = header;
	this.footer = footer;
	this.detailLines = detailLines;

	checkIfDetailLinesTotalAmountMatchesFooterTotalAmount();
    }

    private void checkIfDetailLinesTotalAmountMatchesFooterTotalAmount() {
	Money totalEntriesAmount = Money.ZERO;
	for (final SibsIncommingPaymentFileDetailLine detailLine : getDetailLines()) {
	    totalEntriesAmount = totalEntriesAmount.add(detailLine.getAmount());
	}

	if (!totalEntriesAmount.equals(footer.getTransactionsTotalAmount())) {
	    throw new RuntimeException("Footer total amount does not match detail lines total amount");
	}

    }

    public static SibsIncommingPaymentFile parse(String filename, InputStream stream) {

	SibsIncommingPaymentFileHeader header = null;
	SibsIncommingPaymentFileFooter footer = null;
	final List<SibsIncommingPaymentFileDetailLine> detailLines = new ArrayList<SibsIncommingPaymentFileDetailLine>();
	final BufferedReader reader = new BufferedReader(new InputStreamReader(stream));

	try {
	    String line = reader.readLine();
	    while (line != null) {

		if (isHeader(line)) {
		    header = SibsIncommingPaymentFileHeader.buildFrom(line);
		} else if (isDetail(line)) {
		    detailLines.add(SibsIncommingPaymentFileDetailLine.buildFrom(line));
		} else if (isFooter(line)) {
		    footer = SibsIncommingPaymentFileFooter.buildFrom(line);
		} else {
		    throw new RuntimeException("Unknown sibs incomming payment file line type");
		}

		line = reader.readLine();
	    }
	} catch (IOException e) {
	    throw new RuntimeException(e);
	}

	return new SibsIncommingPaymentFile(filename, header, footer, detailLines);

    }

    private static boolean isFooter(String line) {
	return line.startsWith(FOOTER_REGISTER_TYPE);
    }

    private static boolean isHeader(String line) {
	return line.startsWith(HEADER_REGISTER_TYPE);
    }

    private static boolean isDetail(String line) {
	return line.startsWith(DETAIL_REGISTER_TYPE);
    }

    public List<SibsIncommingPaymentFileDetailLine> getDetailLines() {
	return Collections.unmodifiableList(detailLines);
    }

    public SibsIncommingPaymentFileFooter getFooter() {
	return footer;
    }

    public SibsIncommingPaymentFileHeader getHeader() {
	return header;
    }

    public String getFilename() {
	return filename;
    }

}