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// 
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// 
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// 
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// 
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
// 
package org.eclipse.jetty.http;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.jetty.http.MimeTypes.Type;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.resource.Resource;

/**
 *  HttpContent created from a {@link Resource}.
 *  The HttpContent is used to server static content that is not
 *  cached. So fields and values are only generated as need be an not
 *  kept for reuse
 *
 * @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
 */
@Deprecated(since = "2021-05-27")
public class ResourceHttpContent implements HttpContent {

    final Resource _resource;

    final String _contentType;

    final int _maxBuffer;

    Map _precompressedContents;

    String _etag;

    public ResourceHttpContent(final Resource resource, final String contentType) {
        this(resource, contentType, -1, null);
    }

    public ResourceHttpContent(final Resource resource, final String contentType, int maxBuffer) {
        this(resource, contentType, maxBuffer, null);
    }

    public ResourceHttpContent(final Resource resource, final String contentType, int maxBuffer, Map precompressedContents) {
        _resource = resource;
        _contentType = contentType;
        _maxBuffer = maxBuffer;
        if (precompressedContents == null) {
            _precompressedContents = null;
        } else {
            _precompressedContents = new HashMap<>(precompressedContents.size());
            for (Map.Entry entry : precompressedContents.entrySet()) {
                _precompressedContents.put(entry.getKey(), new PrecompressedHttpContent(this, entry.getValue(), entry.getKey()));
            }
        }
    }

    @Override
    public String getContentTypeValue() {
        return _contentType;
    }

    @Override
    public HttpField getContentType() {
        return _contentType == null ? null : new HttpField(HttpHeader.CONTENT_TYPE, _contentType);
    }

    @Override
    public HttpField getContentEncoding() {
        return null;
    }

    @Override
    public String getContentEncodingValue() {
        return null;
    }

    @Override
    public String getCharacterEncoding() {
        return _contentType == null ? null : MimeTypes.getCharsetFromContentType(_contentType);
    }

    @Override
    public Type getMimeType() {
        return _contentType == null ? null : MimeTypes.CACHE.get(MimeTypes.getContentTypeWithoutCharset(_contentType));
    }

    @Override
    public HttpField getLastModified() {
        long lm = _resource.lastModified();
        return lm >= 0 ? new HttpField(HttpHeader.LAST_MODIFIED, DateGenerator.formatDate(lm)) : null;
    }

    @Override
    public String getLastModifiedValue() {
        long lm = _resource.lastModified();
        return lm >= 0 ? DateGenerator.formatDate(lm) : null;
    }

    @Override
    public ByteBuffer getDirectBuffer() {
        if (_resource.length() <= 0 || _maxBuffer > 0 && _resource.length() > _maxBuffer)
            return null;
        try {
            return BufferUtil.toBuffer(_resource, true);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public HttpField getETag() {
        return new HttpField(HttpHeader.ETAG, getETagValue());
    }

    @Override
    public String getETagValue() {
        return _resource.getWeakETag();
    }

    @Override
    public ByteBuffer getIndirectBuffer() {
        if (_resource.length() <= 0 || _maxBuffer > 0 && _resource.length() > _maxBuffer)
            return null;
        try {
            return BufferUtil.toBuffer(_resource, false);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public HttpField getContentLength() {
        long l = _resource.length();
        return l == -1 ? null : new HttpField.LongValueHttpField(HttpHeader.CONTENT_LENGTH, l);
    }

    @Override
    public long getContentLengthValue() {
        return _resource.length();
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return _resource.getInputStream();
    }

    @Override
    public ReadableByteChannel getReadableByteChannel() throws IOException {
        return _resource.getReadableByteChannel();
    }

    @Override
    public Resource getResource() {
        return _resource;
    }

    @Override
    public void release() {
        _resource.close();
    }

    @Override
    public String toString() {
        return String.format("%s@%x{r=%s,ct=%s,c=%b}", this.getClass().getSimpleName(), hashCode(), _resource, _contentType, _precompressedContents != null);
    }

    @Override
    public Map getPrecompressedContents() {
        return _precompressedContents;
    }
}