/*
 * 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.util.List;

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

/**
 */
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()}
     */
    @Deprecated
    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) {
        if (results == null || results.isEmpty()) {
            return "Some problems were encountered while processing the POMs";
        }

        long totalProblems = 0;
        long errorProblems = 0;

        for (ProjectBuildingResult result : results) {
            List<ModelProblem> problems = result.getProblems();
            totalProblems += problems.size();

            for (ModelProblem problem : problems) {
                if (problem.getSeverity() != ModelProblem.Severity.WARNING) {
                    errorProblems++;
                }
            }
        }

        StringBuilder buffer = new StringBuilder(1024);
        buffer.append(totalProblems);
        buffer.append(totalProblems == 1 ? " problem was " : " problems were ");
        buffer.append("encountered while processing the POMs");

        if (errorProblems > 0) {
            buffer.append(" (")
                    .append(errorProblems)
                    .append(" ")
                    .append(errorProblems > 1 ? "errors" : "error")
                    .append(")");
        }

        buffer.append(":\n");

        for (ProjectBuildingResult result : results) {
            if (!result.getProblems().isEmpty()) {
                String projectInfo = result.getProjectId();
                if (projectInfo.trim().isEmpty()) {
                    projectInfo =
                            result.getPomFile() != null ? result.getPomFile().getName() : "unknown project";
                }

                buffer.append("\n[").append(projectInfo).append("]\n");

                for (ModelProblem problem : result.getProblems()) {
                    if (errorProblems > 0 && problem.getSeverity() == ModelProblem.Severity.WARNING) {
                        continue;
                    }

                    buffer.append("  [").append(problem.getSeverity()).append("] ");
                    buffer.append(problem.getMessage());

                    String location = "";
                    if (!problem.getSource().trim().isEmpty()) {
                        location = problem.getSource();
                    }
                    if (problem.getLineNumber() > 0) {
                        if (!location.isEmpty()) {
                            location += ", ";
                        }
                        location += "line " + problem.getLineNumber();
                    }
                    if (problem.getColumnNumber() > 0) {
                        if (!location.isEmpty()) {
                            location += ", ";
                        }
                        location += "column " + problem.getColumnNumber();
                    }

                    if (!location.isEmpty()) {
                        buffer.append(" @ ").append(location);
                    }
                    buffer.append("\n");
                }
            }
        }

        return buffer.toString();
    }
}
