/*
 * 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.maven.project;

import java.io.File;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.List;

import org.apache.maven.model.building.ModelProblem;
import org.apache.maven.model.building.ModelProblemUtils;

/**
 * @author Jason van Zyl
 */
public class ProjectBuildingException extends Exception {
    private final String projectId;

    private File pomFile;

    private List<ProjectBuildingResult> results;

    public ProjectBuildingException(String projectId, String message, Throwable cause) {
        super(createMessage(message, projectId, null), cause);
        this.projectId = projectId;
    }

    /**
     * @param projectId
     * @param message
     * @param pomFile   pom file location
     */
    public ProjectBuildingException(String projectId, String message, File pomFile) {
        super(createMessage(message, projectId, pomFile));
        this.projectId = projectId;
        this.pomFile = pomFile;
    }

    /**
     * @param projectId
     * @param message
     * @param pomFile   pom file location
     * @param cause
     */
    protected ProjectBuildingException(String projectId, String message, File pomFile, Throwable cause) {
        super(createMessage(message, projectId, pomFile), cause);
        this.projectId = projectId;
        this.pomFile = pomFile;
    }

    public ProjectBuildingException(List<ProjectBuildingResult> results) {
        super(createMessage(results));
        this.projectId = "";
        this.results = results;
    }

    public File getPomFile() {
        return pomFile;
    }

    /**
     * @deprecated use {@link #getPomFile()}
     */
    public String getPomLocation() {
        if (getPomFile() != null) {
            return getPomFile().getAbsolutePath();
        } else {
            return "null";
        }
    }

    public String getProjectId() {
        return projectId;
    }

    public List<ProjectBuildingResult> getResults() {
        return results;
    }

    private static String createMessage(String message, String projectId, File pomFile) {
        StringBuilder buffer = new StringBuilder(256);
        buffer.append(message);
        buffer.append(" for project ").append(projectId);
        if (pomFile != null) {
            buffer.append(" at ").append(pomFile.getAbsolutePath());
        }
        return buffer.toString();
    }

    private static String createMessage(List<ProjectBuildingResult> results) {
        StringWriter buffer = new StringWriter(1024);
        PrintWriter writer = new PrintWriter(buffer);
        writer.println("Some problems were encountered while processing the POMs:");
        try {

            for (ProjectBuildingResult result : results) {
                for (ModelProblem problem : result.getProblems()) {
                    writer.print("[");
                    writer.print(problem.getSeverity());
                    writer.print("] ");
                    writer.print(problem.getMessage());
                    writer.print(" @ ");
                    writer.println(ModelProblemUtils.formatLocation(problem, result.getProjectId()));
                }
            }
        } finally {
            writer.close();
        }
        return buffer.toString();
    }
}
