/*
 *  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.tools.ant.taskdefs.optional;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.nio.file.Files;
import java.util.Map;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.taskdefs.Execute;
import org.apache.tools.ant.taskdefs.ExecuteStreamHandler;
import org.apache.tools.ant.taskdefs.LogOutputStream;
import org.apache.tools.ant.taskdefs.LogStreamHandler;
import org.apache.tools.ant.taskdefs.PumpStreamHandler;
import org.apache.tools.ant.taskdefs.condition.Os;
import org.apache.tools.ant.types.Commandline;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.util.FileUtils;

/**
 * Invokes the rpm tool to build a Linux installation file.
 *
 */
public class Rpm extends Task {

    private static final String PATH1 = "PATH";
    private static final String PATH2 = "Path";
    private static final String PATH3 = "path";

    /**
     * the spec file
     */
    private String specFile;

    /**
     * the rpm top dir
     */
    private File topDir;

    /**
     * the rpm command to use
     */
    private String command = "-bb";

    /**
     * The executable to use for building the packages.
     * @since Ant 1.6
     */
    private String rpmBuildCommand = null;

    /**
     * clean BUILD directory
     */
    private boolean cleanBuildDir = false;

    /**
     * remove spec file
     */
    private boolean removeSpec = false;

    /**
     * remove sources
     */
    private boolean removeSource = false;

    /**
     * the file to direct standard output from the command
     */
    private File output;

    /**
     * the file to direct standard error from the command
     */
    private File error;

    /**
     * Halt on error return value from rpm build.
     */
    private boolean failOnError = false;

    /**
     * Don't show output of RPM build command on console. This does not affect
     * the printing of output and error messages to files.
     */
    private boolean quiet = false;

    /**
     * Execute the task
     *
     * @throws BuildException is there is a problem in the task execution.
     */
    @Override
    public void execute() throws BuildException {

        Commandline toExecute = new Commandline();

        toExecute.setExecutable(rpmBuildCommand == null ? guessRpmBuildCommand()
                : rpmBuildCommand);
        if (topDir != null) {
            toExecute.createArgument().setValue("--define");
            toExecute.createArgument().setValue("_topdir " + topDir);
        }

        toExecute.createArgument().setLine(command);

        if (cleanBuildDir) {
            toExecute.createArgument().setValue("--clean");
        }
        if (removeSpec) {
            toExecute.createArgument().setValue("--rmspec");
        }
        if (removeSource) {
            toExecute.createArgument().setValue("--rmsource");
        }

        toExecute.createArgument().setValue("SPECS/" + specFile);

        ExecuteStreamHandler streamhandler = null;
        OutputStream outputstream = null;
        OutputStream errorstream = null;
        if (error == null && output == null) {
            if (!quiet) {
                streamhandler = new LogStreamHandler(this, Project.MSG_INFO,
                                                     Project.MSG_WARN);
            } else {
                streamhandler = new LogStreamHandler(this, Project.MSG_DEBUG,
                                                     Project.MSG_DEBUG);
            }
        } else {
            if (output != null) {
                OutputStream fos = null;
                try {
                    fos = Files.newOutputStream(output.toPath()); //NOSONAR
                    BufferedOutputStream bos = new BufferedOutputStream(fos);
                    outputstream = new PrintStream(bos);
                } catch (IOException e) {
                    FileUtils.close(fos);
                    throw new BuildException(e, getLocation());
                }
            } else if (!quiet) {
                outputstream = new LogOutputStream(this, Project.MSG_INFO);
            } else {
                outputstream = new LogOutputStream(this, Project.MSG_DEBUG);
            }
            if (error != null) {
                OutputStream fos = null;
                try {
                    fos = Files.newOutputStream(error.toPath());
                    BufferedOutputStream bos = new BufferedOutputStream(fos);
                    errorstream = new PrintStream(bos);
                } catch (IOException e) {
                    FileUtils.close(fos);
                    throw new BuildException(e, getLocation());
                }
            } else if (!quiet) {
                errorstream = new LogOutputStream(this, Project.MSG_WARN);
            } else {
                errorstream = new LogOutputStream(this, Project.MSG_DEBUG);
            }
            streamhandler = new PumpStreamHandler(outputstream, errorstream);
        }

        Execute exe = getExecute(toExecute, streamhandler);
        try {
            log("Building the RPM based on the " + specFile + " file");
            int returncode = exe.execute();
            if (Execute.isFailure(returncode)) {
                String msg = "'" + toExecute.getExecutable()
                    + "' failed with exit code " + returncode;
                if (failOnError) {
                    throw new BuildException(msg);
                }
                log(msg, Project.MSG_ERR);
            }
        } catch (IOException e) {
            throw new BuildException(e, getLocation());
        } finally {
            FileUtils.close(outputstream);
            FileUtils.close(errorstream);
        }
    }

    /**
     * The directory which will have the expected
     * subdirectories, SPECS, SOURCES, BUILD, SRPMS; optional.
     * If this isn't specified,
     * the <code>baseDir</code> value is used
     *
     * @param td the directory containing the normal RPM directories.
     */
    public void setTopDir(File td) {
        this.topDir = td;
    }

    /**
     * What command to issue to the rpm build tool; optional.
     * The default is "-bb"
     * @param c the command to use.
     */
    public void setCommand(String c) {
        this.command = c;
    }

    /**
     * The name of the spec File to use; required.
     * @param sf the spec file name to use.
     */
    public void setSpecFile(String sf) {
        if (sf == null || sf.trim().isEmpty()) {
            throw new BuildException("You must specify a spec file", getLocation());
        }
        this.specFile = sf;
    }

    /**
     * Flag (optional, default=false) to remove
     * the generated files in the BUILD directory
     * @param cbd a <code>boolean</code> value.
     */
    public void setCleanBuildDir(boolean cbd) {
        cleanBuildDir = cbd;
    }

    /**
     * Flag (optional, default=false) to remove the spec file from SPECS
     * @param rs a <code>boolean</code> value.
     */
    public void setRemoveSpec(boolean rs) {
        removeSpec = rs;
    }

    /**
     * Flag (optional, default=false)
     * to remove the sources after the build.
     * See the <code>--rmsource</code>  option of rpmbuild.
     * @param rs a <code>boolean</code> value.
     */
    public void setRemoveSource(boolean rs) {
        removeSource = rs;
    }

    /**
     * Optional file to save stdout to.
     * @param output the file to save stdout to.
     */
    public void setOutput(File output) {
        this.output = output;
    }

    /**
     * Optional file to save stderr to
     * @param error the file to save error output to.
     */
    public void setError(File error) {
        this.error = error;
    }

    /**
     * The executable to run when building; optional.
     * The default is <code>rpmbuild</code>.
     *
     * @since Ant 1.6
     * @param c the rpm build executable
     */
    public void setRpmBuildCommand(String c) {
        this.rpmBuildCommand = c;
    }

    /**
     * If <code>true</code>, stop the build process when the rpmbuild command
     * exits with an error status.
     * @param value <code>true</code> if it should halt, otherwise
     * <code>false</code>. The default is <code>false</code>.
     *
     * @since Ant 1.6.3
     */
    public void setFailOnError(boolean value) {
        failOnError = value;
    }

    /**
     * If true, output from the RPM build command will only be logged to DEBUG.
     * @param value <code>false</code> if output should be logged, otherwise
     * <code>true</code>. The default is <code>false</code>.
     *
     * @since Ant 1.6.3
     */
    public void setQuiet(boolean value) {
        quiet = value;
    }

    /**
     * Checks whether <code>rpmbuild</code> is on the PATH and returns
     * the absolute path to it - falls back to <code>rpm</code>
     * otherwise.
     *
     * @return the command used to build RPM's
     *
     * @since 1.6
     */
    protected String guessRpmBuildCommand() {
        Map<String, String> env = Execute.getEnvironmentVariables();
        String path = env.get(PATH1);
        if (path == null) {
            path = env.get(PATH2);
            if (path == null) {
                path = env.get(PATH3);
            }
        }

        if (path != null) {
            Path p = new Path(getProject(), path);
            String[] pElements = p.list();
            for (String pElement : pElements) {
                File f = new File(pElement,
                                  "rpmbuild"
                                  + (Os.isFamily("dos") ? ".exe" : ""));
                if (f.canRead()) {
                    return f.getAbsolutePath();
                }
            }
        }

        return "rpm";
    }

    /**
     * Get the execute object.
     * @param toExecute the command line to use.
     * @param streamhandler the stream handler to use.
     * @return the execute object.
     * @since Ant 1.6.3
     */
    protected Execute getExecute(Commandline toExecute,
                                 ExecuteStreamHandler streamhandler) {
        Execute exe = new Execute(streamhandler, null);

        exe.setAntRun(getProject());
        if (topDir == null) {
            topDir = getProject().getBaseDir();
        }
        exe.setWorkingDirectory(topDir);

        exe.setCommandline(toExecute.getCommandline());
        return exe;
    }
}
