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/*
 * Copyright (c) 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.core.publisher;

import reactor.util.Logger;

/**
 * Implementation of the well formatted states migration logger.
 */
class StateLogger {

	final Logger logger;

	StateLogger(Logger logger) {
		this.logger = logger;
	}

	void log(String instance, String action, long initialState, long committedState) {
		log(instance, action, initialState, committedState, false);
	}

	void log(String instance,
			String action,
			long initialState,
			long committedState,
			boolean logStackTrace) {
		if (logStackTrace) {
			this.logger.trace(String.format("[%s][%s][%s][%s-%s]",
					instance,
					action,
					action,
					Thread.currentThread()
					      .getId(),
					formatState(initialState, 64),
					formatState(committedState, 64)), new RuntimeException());
		}
		else {
			this.logger.trace(String.format("[%s][%s][%s][%s-%s]",
					instance,
					action,
					Thread.currentThread()
					      .getId(),
					formatState(initialState, 64),
					formatState(committedState, 64)));
		}
	}

	void log(String instance, String action, int initialState, int committedState) {
		log(instance, action, initialState, committedState, false);
	}

	void log(String instance,
			String action,
			int initialState,
			int committedState,
			boolean logStackTrace) {
		if (logStackTrace) {
			this.logger.trace(String.format("[%s][%s][%s][%s-%s]",
					instance,
					action,
					action,
					Thread.currentThread()
					      .getId(),
					formatState(initialState, 32),
					formatState(committedState, 32)), new RuntimeException());
		}
		else {
			this.logger.trace(String.format("[%s][%s][%s][%s-%s]",
					instance,
					action,
					Thread.currentThread()
					      .getId(),
					formatState(initialState, 32),
					formatState(committedState, 32)));
		}
	}

	static String formatState(long state, int size) {
		final String defaultFormat = Long.toBinaryString(state);
		final StringBuilder formatted = new StringBuilder();
		final int toPrepend = size - defaultFormat.length();
		for (int i = 0; i < size; i++) {
			if (i != 0 && i % 4 == 0) {
				formatted.append("_");
			}
			if (i < toPrepend) {
				formatted.append("0");
			}
			else {
				formatted.append(defaultFormat.charAt(i - toPrepend));
			}
		}

		formatted.insert(0, "0b");
		return formatted.toString();
	}

}