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package org.codehaus.httpcache4j.util;

import org.codehaus.httpcache4j.HTTPException;
import org.codehaus.httpcache4j.Header;
import org.codehaus.httpcache4j.Headers;
import org.codehaus.httpcache4j.payload.Payload;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.util.Optional;

/**
 * @author Erlend Hamnaberg
 * @version $Revision: #5 $ $Date: 2008/09/15 $
 */
public abstract class AbstractHTTPWriter {

    protected void writeHeaders(PrintStream writer, Headers headers) {
        StringBuilder builder = new StringBuilder();
        for (Header header : headers) {
            if (builder.length() > 0) {
                builder.append("\r\n");
            }
            builder.append(header);
        }
        println(writer, builder.toString());
    }

    protected void println(PrintStream writer, String value) {
        writer.printf("%s\r\n", value);
    }

    protected void writeBody(PrintStream writer, Optional payload) {
        payload.ifPresent(p -> {
            writer.print("\r\n");
            if (p.isAvailable()) {
                try (InputStream stream = p.getInputStream()) {
                    IOUtils.copy(stream, writer);
                    writer.print("\r\n");
                } catch (IOException e) {
                    throw new HTTPException("Unable to write the body of the response", e);
                }
            }
        });
    }
}