/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
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 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
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 *
 * 5. Products derived from this software may not be called "Apache"
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.tools.ant.taskdefs;

import org.apache.tools.ant.*;
import org.apache.tools.ant.types.*;

import java.io.*;

/**
 * Executes a given command if the os platform is appropriate.
 *
 * @author duncan@x180.com
 * @author rubys@us.ibm.com
 * @author thomas.haas@softwired-inc.com
 * @author <a href="mailto:stefan.bodewig@megabit.net">Stefan Bodewig</a>
 */
public class ExecTask extends Task {

    private String os;
    private File out;
    private File dir;
    private boolean failOnError = false;
    private Integer timeout = null;
    private Environment env = new Environment();
    private Commandline cmdl = new Commandline();
    private FileOutputStream fos = null;

    public void setTimeout(Integer value) {
        timeout = value;
    }

    public void setExecutable(String value) {
        cmdl.setExecutable(value);
    }

    public void setDir(File d) {
        this.dir = d;
    }

    public void setOs(String os) {
        this.os = os;
    }

    public void setCommand(Commandline cmdl) {
        this.cmdl = cmdl;
    }

    public void setOutput(File out) {
        this.out = out;
    }

    public void setFailonerror(boolean fail) {
        failOnError = fail;
    }

    public void addEnv(Environment.Variable var) {
        env.addVariable(var);
    }

    public Commandline.Argument createArg() {
        return cmdl.createArgument();
    }

    public void execute() throws BuildException {
        if (cmdl.getExecutable() == null) {
            throw new BuildException("no executable specified", location);
        }

        String[] orig = cmdl.getCommandline();
        
        int err = -1; // assume the worst

        // test if os match
        String myos = System.getProperty("os.name");
        log("Myos = " + myos, Project.MSG_VERBOSE);
        if ((os != null) && (os.indexOf(myos) < 0)){
            // this command will be executed only on the specified OS
            log("Not found in " + os, Project.MSG_VERBOSE);
            return;
        }

        // default directory to the project's base directory
        if (dir == null) dir = project.getBaseDir();

        if (myos.toLowerCase().indexOf("windows") >= 0) {
            if (!dir.equals(project.resolveFile("."))) {
                if (myos.toLowerCase().indexOf("nt") >= 0) {
                    cmdl = new Commandline();
                    cmdl.setExecutable("cmd");
                    cmdl.addValue("/c");
                    cmdl.addValue("cd");
                    cmdl.addValue(dir.getAbsolutePath());
                    cmdl.addValue("&&");
                    cmdl.addLine(orig);
                } else {
                    String ant = project.getProperty("ant.home");
                    if (ant == null) {
                        throw new BuildException("Property 'ant.home' not found", location);
                    }
                
                    String antRun = project.resolveFile(ant + "/bin/antRun.bat").toString();
                    cmdl = new Commandline();
                    cmdl.setExecutable(antRun);
                    cmdl.addValue(dir.getAbsolutePath());
                    cmdl.addLine(orig);
                }
            }
        } else {
            String ant = project.getProperty("ant.home");
            if (ant == null) throw new BuildException("Property 'ant.home' not found", location);
            String antRun = project.resolveFile(ant + "/bin/antRun").toString();

            cmdl = new Commandline();
            cmdl.setExecutable(antRun);
            cmdl.addValue(dir.getAbsolutePath());
            cmdl.addLine(orig);
        }

        try {
            // show the command
            log(cmdl.toString(), Project.MSG_VERBOSE);

            final Execute exe = new Execute(createHandler(), createWatchdog());
            exe.setCommandline(cmdl.getCommandline());
            exe.setEnvironment(env.getVariables());
            err = exe.execute();
            if (err != 0) {
                if (failOnError) {
                    throw new BuildException("Exec returned: "+err, location);
                } else {
                    log("Result: " + err, Project.MSG_ERR);
                }
            }
        } catch (IOException e) {
            throw new BuildException("Execute failed: " + e, e, location);
        } finally {
            // close the output file if required
            logFlush();
        }
    }


    protected ExecuteStreamHandler createHandler() throws BuildException {
        if(out!=null)  {
            try {
                fos = new FileOutputStream(out);
                log("Output redirected to " + out, Project.MSG_VERBOSE);
                return new PumpStreamHandler(fos);
            } catch (FileNotFoundException fne) {
                throw new BuildException("Cannot write to "+out, fne, location);
            } catch (IOException ioe) {
                throw new BuildException("Cannot write to "+out, ioe, location);
            }
        } else {
            return new LogStreamHandler(this,
                                        Project.MSG_INFO, Project.MSG_WARN);
        }
    }

    protected ExecuteWatchdog createWatchdog() throws BuildException {
        if (timeout == null) return null;
        return new ExecuteWatchdog(timeout.intValue());
    }

    protected void logFlush() {
        try {
            if (fos != null) fos.close();
        } catch (IOException io) {}
    }

}