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 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package org.graalvm.component.installer.commands;

import java.io.File;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Stream;
import org.graalvm.component.installer.CommonConstants;
import static org.graalvm.component.installer.CommonConstants.WARN_REBUILD_IMAGES;
import org.graalvm.component.installer.Feedback;
import org.graalvm.component.installer.FileOperations;
import org.graalvm.component.installer.SystemUtils;
import org.graalvm.component.installer.model.ComponentInfo;

Author:
sdedic/**
 *
 * @author sdedic
 */
public class PreRemoveProcess {
    private final Path installPath;
    private final Feedback feedback;
    private final List<ComponentInfo> infos = new ArrayList<>();
    private final FileOperations fileOps;

    private boolean rebuildPolyglot;

    private boolean dryRun;
    private boolean ignoreFailedDeletions;
    private Set<String> knownPaths;

    public PreRemoveProcess(Path instPath, FileOperations fops, Feedback fb) {
        this.feedback = fb.withBundle(PreRemoveProcess.class);
        installPath = instPath;
        fileOps = fops;
    }

    public boolean isDryRun() {
        return dryRun;
    }

    public PreRemoveProcess setDryRun(boolean dryRun) {
        this.dryRun = dryRun;
        return this;
    }

    public boolean isIgnoreFailedDeletions() {
        return ignoreFailedDeletions;
    }

    public PreRemoveProcess setIgnoreFailedDeletions(boolean ignoreFailedDeletions) {
        this.ignoreFailedDeletions = ignoreFailedDeletions;
        return this;
    }

    public void addComponentInfo(ComponentInfo info) {
        this.infos.add(info);
    }

    
Process all the components, prints message.
Throws:
IOException – if deletion fails/**
     * Process all the components, prints message.
     * 
     * @throws IOException if deletion fails
     */
    public void run() throws IOException {
        for (ComponentInfo ci : infos) {
            processComponent(ci);
        }
        if (rebuildPolyglot && WARN_REBUILD_IMAGES) {
            Path p = SystemUtils.fromCommonString(CommonConstants.PATH_JRE_BIN);
            feedback.output("INSTALL_RebuildPolyglotNeeded", File.separator, installPath.resolve(p).normalize());
        }
    }

    
Called also from Uninstaller. Will delete one single file, possibly with altering permissions
on the parent so the file can be deleted.
Params:
p – file to delete
Throws:
IOException – /**
     * Called also from Uninstaller. Will delete one single file, possibly with altering permissions
     * on the parent so the file can be deleted.
     * 
     * @param p file to delete
     * @throws IOException
     */
    void deleteOneFile(Path p) throws IOException {
        try {
            fileOps.deleteFile(p);
        } catch (IOException ex) {
            if (ignoreFailedDeletions) {
                if (Files.isDirectory(p)) {
                    feedback.error("INSTALL_FailedToDeleteDirectory", ex, p, ex.getLocalizedMessage());
                } else {
                    feedback.error("INSTALL_FailedToDeleteFile", ex, p, ex.getLocalizedMessage());
                }
                return;
            }
            throw ex;
            // throw new UncheckedIOException(ex);
        }
    }

    
Also called from Uninstaller.
Params:
rootPath – root path to delete (inclusive)
Throws:
IOException – if the deletion fails./**
     * Also called from Uninstaller.
     * 
     * @param rootPath root path to delete (inclusive)
     * @throws IOException if the deletion fails.
     */
    void deleteContentsRecursively(Path rootPath) throws IOException {
        if (dryRun) {
            return;
        }
        try (Stream<Path> paths = Files.walk(rootPath)) {
            paths.sorted(Comparator.reverseOrder()).forEach((p) -> {
                try {
                    if (!p.equals(rootPath) && shouldDeletePath(p)) {
                        deleteOneFile(p);
                    }
                } catch (IOException ex) {
                    throw new UncheckedIOException(ex);
                }
            });
        } catch (UncheckedIOException ex) {
            throw ex.getCause();
        }
    }

    private boolean shouldDeletePath(Path toDelete) {
        Path rel;
        try {
            rel = installPath.relativize(toDelete);
        } catch (IllegalArgumentException ex) {
            // cannot relativize; avoid to delete such thing.
            return false;
        }
        String relString = SystemUtils.toCommonPath(rel);
        if (Files.isDirectory(toDelete)) {
            relString += "/"; // NOI18N
        }
        return knownPaths == null || !knownPaths.contains(relString);
    }

    void processComponent(ComponentInfo ci) throws IOException {
        rebuildPolyglot |= ci.isPolyglotRebuild();
        for (String s : ci.getWorkingDirectories()) {
            Path p = installPath.resolve(SystemUtils.fromCommonRelative(s));
            feedback.verboseOutput("UNINSTALL_DeletingDirectoryRecursively", p);
            this.knownPaths = new HashSet<>(ci.getPaths());
            deleteContentsRecursively(p);
        }
    }
}