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package com.firefly.codec.http2.model;

import java.io.FilterWriter;
import java.io.IOException;
import java.io.Writer;

public class MultiPartWriter extends FilterWriter {

    private final static String __CRLF = "\015\012";
    private final static String __DASHDASH = "--";

    public static final String MULTIPART_MIXED = MultiPartOutputStream.MULTIPART_MIXED;
    public static final String MULTIPART_X_MIXED_REPLACE = MultiPartOutputStream.MULTIPART_X_MIXED_REPLACE;

    private String boundary;

    private boolean inPart = false;

    public MultiPartWriter(Writer out) throws IOException {
        super(out);
        boundary = "firefly" + System.identityHashCode(this) + Long.toString(System.currentTimeMillis(), 36);

        inPart = false;
    }

    /**
     * End the current part.
     *
     * @throws IOException IOException
     */
    @Override
    public void close() throws IOException {
        try {
            if (inPart)
                out.write(__CRLF);
            out.write(__DASHDASH);
            out.write(boundary);
            out.write(__DASHDASH);
            out.write(__CRLF);
            inPart = false;
        } finally {
            super.close();
        }
    }

    public String getBoundary() {
        return boundary;
    }

    /**
     * Start creation of the next Content.
     *
     * @param contentType the content type
     * @throws IOException if unable to write the part
     */
    public void startPart(String contentType) throws IOException {
        if (inPart)
            out.write(__CRLF);
        out.write(__DASHDASH);
        out.write(boundary);
        out.write(__CRLF);
        out.write("Content-Type: ");
        out.write(contentType);
        out.write(__CRLF);
        out.write(__CRLF);
        inPart = true;
    }

    /**
     * end creation of the next Content.
     *
     * @throws IOException if unable to write the part
     */
    public void endPart() throws IOException {
        if (inPart)
            out.write(__CRLF);
        inPart = false;
    }

    /**
     * Start creation of the next Content.
     *
     * @param contentType the content type of the part
     * @param headers     the part headers
     * @throws IOException if unable to write the part
     */
    public void startPart(String contentType, String[] headers) throws IOException {
        if (inPart)
            out.write(__CRLF);
        out.write(__DASHDASH);
        out.write(boundary);
        out.write(__CRLF);
        out.write("Content-Type: ");
        out.write(contentType);
        out.write(__CRLF);
        for (int i = 0; headers != null && i < headers.length; i++) {
            out.write(headers[i]);
            out.write(__CRLF);
        }
        out.write(__CRLF);
        inPart = true;
    }

}