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package com.firefly.codec.http2.model;

import java.util.Collections;
import java.util.Iterator;

public class MetaData implements Iterable {
	private HttpVersion _httpVersion;
	private HttpFields _fields;
	private long _contentLength;

	public MetaData(HttpVersion version, HttpFields fields) {
		this(version, fields, Long.MIN_VALUE);
	}

	public MetaData(HttpVersion version, HttpFields fields, long contentLength) {
		_httpVersion = version;
		_fields = fields;
		_contentLength = contentLength;
	}

	protected void recycle() {
		_httpVersion = null;
		if (_fields != null)
			_fields.clear();
		_contentLength = Long.MIN_VALUE;
	}

	public boolean isRequest() {
		return false;
	}

	public boolean isResponse() {
		return false;
	}

	/**
	 * @return the HTTP version of this MetaData object
	 */
	public HttpVersion getVersion() {
		return _httpVersion;
	}

	/**
	 * @param httpVersion
	 *            the HTTP version to set
	 */
	public void setHttpVersion(HttpVersion httpVersion) {
		_httpVersion = httpVersion;
	}

	/**
	 * @return the HTTP fields of this MetaData object
	 */
	public HttpFields getFields() {
		return _fields;
	}

	/**
	 * @return the content length if available, otherwise {@link Long#MIN_VALUE}
	 */
	public long getContentLength() {
		if (_contentLength == Long.MIN_VALUE) {
			if (_fields != null) {
				HttpField field = _fields.getField(HttpHeader.CONTENT_LENGTH);
				_contentLength = field == null ? -1 : field.getLongValue();
			}
		}
		return _contentLength;
	}

	/**
	 * @return an iterator over the HTTP fields
	 * @see #getFields()
	 */
	public Iterator iterator() {
		HttpFields fields = getFields();
		return fields == null ? Collections. emptyIterator() : fields.iterator();
	}

	@Override
	public String toString() {
		StringBuilder out = new StringBuilder();
		for (HttpField field : this)
			out.append(field).append(System.lineSeparator());
		return out.toString();
	}

	public static class Request extends MetaData {
		private String _method;
		private HttpURI _uri;
		protected Object attachment;

		public Request(HttpFields fields) {
			this(null, null, null, fields);
		}

		public Request(String method, HttpURI uri, HttpVersion version, HttpFields fields) {
			this(method, uri, version, fields, Long.MIN_VALUE);
		}

		public Request(String method, HttpURI uri, HttpVersion version, HttpFields fields, long contentLength) {
			super(version, fields, contentLength);
			_method = method;
			_uri = uri;
		}

		public Request(String method, HttpScheme scheme, HostPortHttpField hostPort, String uri, HttpVersion version,
				HttpFields fields) {
			this(method,
					new HttpURI(scheme == null ? null : scheme.asString(), hostPort.getHost(), hostPort.getPort(), uri),
					version, fields);
		}

		public Request(String method, HttpScheme scheme, HostPortHttpField hostPort, String uri, HttpVersion version,
				HttpFields fields, long contentLength) {
			this(method,
					new HttpURI(scheme == null ? null : scheme.asString(), hostPort.getHost(), hostPort.getPort(), uri),
					version, fields, contentLength);
		}

		public Request(String method, String scheme, HostPortHttpField hostPort, String uri, HttpVersion version,
				HttpFields fields, long contentLength) {
			this(method, new HttpURI(scheme, hostPort.getHost(), hostPort.getPort(), uri), version, fields,
					contentLength);
		}

		public Request(Request request) {
			this(request.getMethod(), new HttpURI(request.getURI()), request.getVersion(),
					new HttpFields(request.getFields()), request.getContentLength());
		}

		public void recycle() {
			super.recycle();
			_method = null;
			if (_uri != null)
				_uri.clear();
		}

		@Override
		public boolean isRequest() {
			return true;
		}

		/**
		 * @return the HTTP method
		 */
		public String getMethod() {
			return _method;
		}

		/**
		 * @param method
		 *            the HTTP method to set
		 */
		public void setMethod(String method) {
			_method = method;
		}

		/**
		 * @return the HTTP URI
		 */
		public HttpURI getURI() {
			return _uri;
		}

		/**
		 * @return the HTTP URI in string form
		 */
		public String getURIString() {
			return _uri == null ? null : _uri.toString();
		}

		/**
		 * @param uri
		 *            the HTTP URI to set
		 */
		public void setURI(HttpURI uri) {
			_uri = uri;
		}

		public Object getAttachment() {
			return attachment;
		}

		public void setAttachment(Object attachment) {
			this.attachment = attachment;
		}

		@Override
		public String toString() {
			HttpFields fields = getFields();
			return String.format("%s{u=%s,%s,h=%d}", getMethod(), getURI(), getVersion(),
					fields == null ? -1 : fields.size());
		}
	}

	public static class Response extends MetaData {
		private int _status;
		private String _reason;

		public Response() {
			this(null, 0, null);
		}

		public Response(HttpVersion version, int status, HttpFields fields) {
			this(version, status, fields, Long.MIN_VALUE);
		}

		public Response(HttpVersion version, int status, HttpFields fields, long contentLength) {
			super(version, fields, contentLength);
			_status = status;
		}

		public Response(HttpVersion version, int status, String reason, HttpFields fields, long contentLength) {
			super(version, fields, contentLength);
			_reason = reason;
			_status = status;
		}

		@Override
		public boolean isResponse() {
			return true;
		}

		/**
		 * @return the HTTP status
		 */
		public int getStatus() {
			return _status;
		}

		/**
		 * @return the HTTP reason
		 */
		public String getReason() {
			return _reason;
		}

		/**
		 * @param status
		 *            the HTTP status to set
		 */
		public void setStatus(int status) {
			_status = status;
		}

		/**
		 * @param reason
		 *            the HTTP reason to set
		 */
		public void setReason(String reason) {
			_reason = reason;
		}

		@Override
		public String toString() {
			HttpFields fields = getFields();
			return String.format("%s{s=%d,h=%d}", getVersion(), getStatus(), fields == null ? -1 : fields.size());
		}
	}
}