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package com.proofpoint.http.client.testing;

import com.proofpoint.http.client.BodySource;
import com.proofpoint.http.client.DynamicBodySource;
import com.proofpoint.http.client.DynamicBodySource.Writer;
import com.proofpoint.http.client.InputStreamBodySource;
import com.proofpoint.http.client.StaticBodyGenerator;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.concurrent.atomic.AtomicBoolean;

public class BodySourceTester
{
    private BodySourceTester()
    {
    }

    public static void writeBodySourceTo(BodySource bodySource, final OutputStream out)
            throws Exception
    {
        if (bodySource instanceof StaticBodyGenerator staticBodyGenerator) {
            out.write(staticBodyGenerator.getBody());
        }
        else if (bodySource instanceof InputStreamBodySource inputStreamBodySource) {
            InputStream in = inputStreamBodySource.getInputStream();
            byte[] buf = new byte[inputStreamBodySource.getBufferSize()];
            while (true) {
                int r = in.read(buf);
                if (r == -1) {
                    break;
                }
                out.write(buf, 0, r);
            }
        }
        else if (bodySource instanceof DynamicBodySource dynamicBodySource) {
            final AtomicBoolean closed = new AtomicBoolean(false);
            Writer writer = dynamicBodySource.start(new OutputStream()
            {
                @Override
                public void write(int b)
                        throws IOException
                {
                    out.write(b);
                }

                @Override
                public void write(byte[] b)
                        throws IOException
                {
                    out.write(b);
                }

                @Override
                public void write(byte[] b, int off, int len)
                        throws IOException
                {
                    out.write(b, off, len);
                }

                @Override
                public void flush()
                        throws IOException
                {
                    out.flush();
                }

                @Override
                public void close()
                {
                    closed.set(true);
                }
            });

            while (!closed.get()) {
                writer.write();
            }

            if (writer instanceof AutoCloseable closeable) {
                closeable.close();
            }
        }
        else {
            throw new IllegalArgumentException("Unsupported BodySource type");
        }
    }
}