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/*
 * Copyright (c) 2021-2022 VMware, Inc. or its affiliates, All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package reactor.netty.http.server;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufHolder;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.LastHttpContent;
import reactor.netty.channel.ChannelOperations;
import reactor.util.annotation.Nullable;

import java.time.Duration;
import java.util.function.Function;

/**
 * @author Violeta Georgieva
 * @since 1.0.8
 */
abstract class AbstractHttpServerMetricsHandler extends ChannelDuplexHandler {

	long dataReceived;

	long dataSent;


	long dataReceivedTime;

	long dataSentTime;


	final Function uriTagValue;

	protected AbstractHttpServerMetricsHandler(@Nullable Function uriTagValue) {
		this.uriTagValue = uriTagValue;
	}

	@Override
	public void channelActive(ChannelHandlerContext ctx) {
		// For custom user recorders, we don't propagate the channelActive event, because this will be done
		// by the ChannelMetricsHandler itself. ChannelMetricsHandler is only present when the recorder is
		// not our MicrometerHttpServerMetricsRecorder. See HttpServerConfig class.
		if (recorder() instanceof MicrometerHttpServerMetricsRecorder) {
			recorder().recordServerConnectionOpened(ctx.channel().localAddress());
		}
		ctx.fireChannelActive();
	}

	@Override
	public void channelInactive(ChannelHandlerContext ctx) {
		if (recorder() instanceof MicrometerHttpServerMetricsRecorder) {
			recorder().recordServerConnectionClosed(ctx.channel().localAddress());
		}
		ctx.fireChannelInactive();
	}

	@Override
	@SuppressWarnings("FutureReturnValueIgnored")
	public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
		if (msg instanceof HttpResponse) {
			if (((HttpResponse) msg).status().equals(HttpResponseStatus.CONTINUE)) {
				//"FutureReturnValueIgnored" this is deliberate
				ctx.write(msg, promise);
				return;
			}

			dataSentTime = System.nanoTime();
		}

		if (msg instanceof ByteBufHolder) {
			dataSent += ((ByteBufHolder) msg).content().readableBytes();
		}
		else if (msg instanceof ByteBuf) {
			dataSent += ((ByteBuf) msg).readableBytes();
		}

		if (msg instanceof LastHttpContent) {
			promise.addListener(future -> {
				ChannelOperations channelOps = ChannelOperations.get(ctx.channel());
				if (channelOps instanceof HttpServerOperations) {
					HttpServerOperations ops = (HttpServerOperations) channelOps;
					recordWrite(ops, uriTagValue == null ? ops.path : uriTagValue.apply(ops.path),
							ops.method().name(), ops.status().codeAsText().toString());
					recordInactiveConnection(ops);
				}

				dataSent = 0;
			});
		}

		//"FutureReturnValueIgnored" this is deliberate
		ctx.write(msg, promise);
	}

	@Override
	public void channelRead(ChannelHandlerContext ctx, Object msg) {
		if (msg instanceof HttpRequest) {
			dataReceivedTime = System.nanoTime();
			ChannelOperations channelOps = ChannelOperations.get(ctx.channel());
			if (channelOps instanceof HttpServerOperations) {
				HttpServerOperations ops = (HttpServerOperations) channelOps;
				recordActiveConnection(ops);
			}
		}

		if (msg instanceof ByteBufHolder) {
			dataReceived += ((ByteBufHolder) msg).content().readableBytes();
		}
		else if (msg instanceof ByteBuf) {
			dataReceived += ((ByteBuf) msg).readableBytes();
		}

		if (msg instanceof LastHttpContent) {
			ChannelOperations channelOps = ChannelOperations.get(ctx.channel());
			if (channelOps instanceof HttpServerOperations) {
				HttpServerOperations ops = (HttpServerOperations) channelOps;
				recordRead(ops, uriTagValue == null ? ops.path : uriTagValue.apply(ops.path), ops.method().name());
			}

			dataReceived = 0;
		}

		ctx.fireChannelRead(msg);
	}

	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
		ChannelOperations channelOps = ChannelOperations.get(ctx.channel());
		if (channelOps instanceof HttpServerOperations) {
			HttpServerOperations ops = (HttpServerOperations) channelOps;
			// Always take the remote address from the operations in order to consider proxy information
			recordException(ops, uriTagValue == null ? ops.path : uriTagValue.apply(ops.path));
		}

		ctx.fireExceptionCaught(cause);
	}

	protected abstract HttpServerMetricsRecorder recorder();

	protected void recordException(HttpServerOperations ops, String path) {
		// Always take the remote address from the operations in order to consider proxy information
		recorder().incrementErrorsCount(ops.remoteAddress(), path);
	}

	protected void recordRead(HttpServerOperations ops, String path, String method) {
		recorder().recordDataReceivedTime(path, method, Duration.ofNanos(System.nanoTime() - dataReceivedTime));

		// Always take the remote address from the operations in order to consider proxy information
		recorder().recordDataReceived(ops.remoteAddress(), path, dataReceived);
	}

	protected void recordWrite(HttpServerOperations ops, String path, String method, String status) {
		Duration dataSentTimeDuration = Duration.ofNanos(System.nanoTime() - dataSentTime);
		recorder().recordDataSentTime(path, method, status, dataSentTimeDuration);

		if (dataReceivedTime != 0) {
			recorder().recordResponseTime(path, method, status, Duration.ofNanos(System.nanoTime() - dataReceivedTime));
		}
		else {
			recorder().recordResponseTime(path, method, status, dataSentTimeDuration);
		}

		// Always take the remote address from the operations in order to consider proxy information
		recorder().recordDataSent(ops.remoteAddress(), path, dataSent);
	}

	protected void recordActiveConnection(HttpServerOperations ops) {
		recorder().recordServerConnectionActive(ops.hostAddress());
	}

	protected void recordInactiveConnection(HttpServerOperations ops) {
		recorder().recordServerConnectionInactive(ops.hostAddress());
	}

}