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package com.crabshue.commons.exceptions.utils;

import org.apache.commons.lang3.StringUtils;

import lombok.extern.slf4j.Slf4j;

/**
 * Utility class to manipulate exceptions.
 */
@Slf4j
public class ExceptionUtils {

    private static final int MESSAGE_MAX_LENGTH = 4000;

    /**
     * Build a message from a {@link Throwable}.
     * 
     * Loop through all the causes and extract the message.
     * 
     *
     * @param throwable the throwable.
     * @return the message built.
     */
    public static String buildMessageFromThrowable(final Throwable throwable) {
        final StringBuilder sb = new StringBuilder();

        try {
            final String message = throwable.getMessage();
            sb.append(message);
            sb.append("\n");
            if (throwable.getCause() != null) {
                final String causeMessage = buildMessageFromThrowable(throwable.getCause());
                sb.append(causeMessage);
            }
        } catch (Exception e) {
            logger.error("Cannot read exception ", e);
            sb.append("something went wrong");
        }
        return StringUtils.abbreviate(StringUtils.removeEnd(sb.toString(), "\n"), MESSAGE_MAX_LENGTH);
    }

    /**
     * Remove all the stack traces from a {@link Throwable}.
     * This is done to prevent issues in the JSON serialization of exceptions.
     *
     * @param throwable the throwable.
     */
    public static void removeStackTraces(final Throwable throwable) {
        throwable.setStackTrace(new StackTraceElement[]{});
        if (throwable.getCause() != null) {
            removeStackTraces(throwable.getCause());
        }
    }


}