/*
 * 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.ode.bpel.compiler.api;

import org.apache.ode.utils.msg.MessageBundle;

public abstract class CompilationMessageBundle extends MessageBundle {

    // TODO turn CompilationMessage.CODE into a proper Java5 enum
    private static String[] PREFIXES = {"inf", "warn", "err"};
    private static short[] SEVERITIES = {CompilationMessage.INFO, CompilationMessage.WARN,
            CompilationMessage.ERROR};

    protected CompilationMessage formatCompilationMessage(String message, Object... args) {
        String methodName = "errUnknown";
        String methodKey = null;
        short severity = 0;

        // format the regular message text
        String msg = this.format(message, args);

        // I will *so* burn in hell for this
        StackTraceElement[] stack = new Throwable().getStackTrace();
        if (stack.length > 1) {
            methodName = stack[1].getMethodName();
        } else {
            // bummer: no stack trace - create an unknown error as fallback.
        }

        // find method prefix
        for (int i = 0; i < PREFIXES.length; i++) {
            if (methodName.startsWith(PREFIXES[i])) {
                methodKey = methodName.substring(PREFIXES[i].length());
                severity = SEVERITIES[i];
                break;
            }
        }

        // found a prefixed method?
        if (methodKey == null) {
            // Ugly hack to fix Websphere issue.
            if (stack.length > 2) {
                methodName = stack[2].getMethodName();
            }

            for (int i = 0; i < PREFIXES.length; i++) {
                if (methodName.startsWith(PREFIXES[i])) {
                    methodKey = methodName.substring(PREFIXES[i].length());
                    severity = SEVERITIES[i];
                    break;
                }
            }

            // If method key is still null throw a exception.
            if(methodKey == null)
                throw new UnsupportedOperationException("unexpected caller method: " + methodName);
        }

        CompilationMessage cmsg = new CompilationMessage();
        cmsg.severity = severity;
        cmsg.phase = 0;
        cmsg.messageText = msg;
        cmsg.code = methodKey;

        return cmsg;
    }

}
