/*
 * 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.collector;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.apache.maven.execution.MavenExecutionRequest;
import org.apache.maven.model.building.ModelProblem;
import org.apache.maven.model.building.ModelProblemUtils;
import org.apache.maven.project.MavenProject;
import org.apache.maven.project.ProjectBuilder;
import org.apache.maven.project.ProjectBuildingException;
import org.apache.maven.project.ProjectBuildingRequest;
import org.apache.maven.project.ProjectBuildingResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Utility to select projects for a given set of pom.xml files.
 */
@Named
@Singleton
public class DefaultProjectsSelector implements ProjectsSelector {
    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultProjectsSelector.class);
    private final ProjectBuilder projectBuilder;

    @Inject
    public DefaultProjectsSelector(ProjectBuilder projectBuilder) {
        this.projectBuilder = projectBuilder;
    }

    @Override
    public List<MavenProject> selectProjects(List<File> files, MavenExecutionRequest request)
            throws ProjectBuildingException {
        ProjectBuildingRequest projectBuildingRequest = request.getProjectBuildingRequest();

        boolean hasProjectSelection = !request.getProjectActivation().isEmpty();
        boolean isRecursive = hasProjectSelection || request.isRecursive();
        List<ProjectBuildingResult> results = projectBuilder.build(files, isRecursive, projectBuildingRequest);

        List<MavenProject> projects = new ArrayList<>(results.size());

        long totalProblemsCount = 0;

        for (ProjectBuildingResult result : results) {
            projects.add(result.getProject());

            int problemsCount = result.getProblems().size();
            totalProblemsCount += problemsCount;
            if (problemsCount != 0 && LOGGER.isWarnEnabled()) {
                LOGGER.warn("");
                LOGGER.warn(
                        "{} {} encountered while building the effective model for '{}' (use -e to see details)",
                        problemsCount,
                        (problemsCount == 1) ? "problem was" : "problems were",
                        result.getProjectId());

                if (request.isShowErrors()) { // this means -e or -X (as -X enables -e as well)
                    for (ModelProblem problem : result.getProblems()) {
                        String loc = ModelProblemUtils.formatLocation(problem, result.getProjectId());
                        LOGGER.warn("{}{}", problem.getMessage(), ((loc != null && !loc.isEmpty()) ? " @ " + loc : ""));
                    }
                }
            }
        }

        if (totalProblemsCount > 0) {
            LOGGER.warn("");
            LOGGER.warn("Total model problems reported: {}", totalProblemsCount);
            LOGGER.warn("");
            LOGGER.warn("It is highly recommended to fix these problems"
                    + " because they threaten the stability of your build.");
            LOGGER.warn("");
            LOGGER.warn("For this reason, future Maven versions might no"
                    + " longer support building such malformed projects.");
            LOGGER.warn("");
        }

        return projects;
    }
}
