/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *     http://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 org.apache.dubbo.rpc.protocol.tri;

import org.apache.dubbo.common.utils.CollectionUtils;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

public class ExceptionUtils {

    private static final int NOT_FOUND = -1;

    public static String getStackTrace(final Throwable throwable) {
        final StringWriter sw = new StringWriter();
        final PrintWriter pw = new PrintWriter(sw, true);
        throwable.printStackTrace(pw);
        return sw.getBuffer().toString();
    }

    public static String getStackFrameString(List<String> stackFrameList) {
        if (CollectionUtils.isEmpty(stackFrameList)) {
            return "";
        }
        StringBuilder stringBuilder = new StringBuilder();
        for (String s : stackFrameList) {
            stringBuilder.append(s).append("\n");
        }
        return stringBuilder.toString();
    }

    public static String[] getStackFrames(final Throwable throwable) {
        if (throwable == null) {
            return new String[0];
        }
        return getStackFrames(getStackTrace(throwable));
    }

    static String[] getStackFrames(final String stackTrace) {
        final String linebreak = System.lineSeparator();
        final StringTokenizer frames = new StringTokenizer(stackTrace, linebreak);
        final List<String> list = new ArrayList<>();
        while (frames.hasMoreTokens()) {
            list.add(frames.nextToken());
        }
        return list.toArray(new String[0]);
    }

    public static List<String> getStackFrameList(final Throwable t, int maxDepth) {
        final String stackTrace = getStackTrace(t);
        final String linebreak = System.lineSeparator();
        final StringTokenizer frames = new StringTokenizer(stackTrace, linebreak);
        final List<String> list = new ArrayList<>();
        for (int i = 0; i < maxDepth && frames.hasMoreTokens(); i++) {
            list.add(frames.nextToken());
        }
        return list;
    }

    public static List<String> getStackFrameList(final Throwable t) {
        return getStackFrameList(t, Integer.MAX_VALUE);
    }
}
