/*
 * Copyright  2001-2002,2004 The Apache Software Foundation
 *
 *  Licensed 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;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Hashtable;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.EnumeratedAttribute;

/**
 * Adds a listener to the current build process that records the
 * output to a file.
 * <p>Several recorders can exist at the same time.  Each recorder is
 * associated with a file.  The filename is used as a unique identifier for
 * the recorders.  The first call to the recorder task with an unused filename
 * will create a recorder (using the parameters provided) and add it to the
 * listeners of the build.  All subsequent calls to the recorder task using
 * this filename will modify that recorders state (recording or not) or other
 * properties (like logging level).</p>
 * <p>Some technical issues: the file's print stream is flushed for "finished"
 * events (buildFinished, targetFinished and taskFinished), and is closed on
 * a buildFinished event.</p>
 * @see RecorderEntry
 * @version 0.5
 * @since Ant 1.4
 * @ant.task name="record" category="utility"
 */
public class Recorder extends Task {

    //////////////////////////////////////////////////////////////////////
    // ATTRIBUTES

    /** The name of the file to record to. */
    private String filename = null;
    /**
     * Whether or not to append. Need Boolean to record an unset state (null).
     */
    private Boolean append = null;
    /**
     * Whether to start or stop recording. Need Boolean to record an unset
     * state (null).
     */
    private Boolean start = null;
    /** The level to log at. A level of -1 means not initialized yet. */
    private int loglevel = -1;
    /** Strip task banners if true.  */
    private boolean emacsMode = false;
    /** The list of recorder entries. */
    private static Hashtable recorderEntries = new Hashtable();

    //////////////////////////////////////////////////////////////////////
    // CONSTRUCTORS / INITIALIZERS

    //////////////////////////////////////////////////////////////////////
    // ACCESSOR METHODS

    /**
     * Sets the name of the file to log to, and the name of the recorder
     * entry.
     *
     * @param fname File name of logfile.
     */
    public void setName(String fname) {
        filename = fname;
    }


    /**
     * Sets the action for the associated recorder entry.
     *
     * @param action The action for the entry to take: start or stop.
     */
    public void setAction(ActionChoices action) {
        if (action.getValue().equalsIgnoreCase("start")) {
            start = Boolean.TRUE;
        } else {
            start = Boolean.FALSE;
        }
    }


    /** Whether or not the logger should append to a previous file.  */
    public void setAppend(boolean append) {
        this.append = new Boolean(append);
    }


    public void setEmacsMode(boolean emacsMode) {
        this.emacsMode = emacsMode;
    }


    /**
     * Sets the level to which this recorder entry should log to.
     *
     * @see VerbosityLevelChoices
     */
    public void setLoglevel(VerbosityLevelChoices level) {
        //I hate cascading if/elseif clauses !!!
        String lev = level.getValue();

        if (lev.equalsIgnoreCase("error")) {
            loglevel = Project.MSG_ERR;
        } else if (lev.equalsIgnoreCase("warn")) {
            loglevel = Project.MSG_WARN;
        } else if (lev.equalsIgnoreCase("info")) {
            loglevel = Project.MSG_INFO;
        } else if (lev.equalsIgnoreCase("verbose")) {
            loglevel = Project.MSG_VERBOSE;
        } else if (lev.equalsIgnoreCase("debug")) {
            loglevel = Project.MSG_DEBUG;
        }
    }

    //////////////////////////////////////////////////////////////////////
    // CORE / MAIN BODY

    /** The main execution.  */
    public void execute() throws BuildException {
        if (filename == null) {
            throw new BuildException("No filename specified");
        }

        getProject().log("setting a recorder for name " + filename,
            Project.MSG_DEBUG);

        // get the recorder entry
        RecorderEntry recorder = getRecorder(filename, getProject());
        // set the values on the recorder
        recorder.setMessageOutputLevel(loglevel);
        recorder.setRecordState(start);
        recorder.setEmacsMode(emacsMode);
    }

    //////////////////////////////////////////////////////////////////////
    // INNER CLASSES

    /**
     * A list of possible values for the <code>setAction()</code> method.
     * Possible values include: start and stop.
     */
    public static class ActionChoices extends EnumeratedAttribute {
        private static final String[] values = {"start", "stop"};


        public String[] getValues() {
            return values;
        }
    }


    /**
     * A list of possible values for the <code>setLoglevel()</code> method.
     * Possible values include: error, warn, info, verbose, debug.
     */
    public static class VerbosityLevelChoices extends EnumeratedAttribute {
        private static final String[] values = {"error", "warn", "info",
            "verbose", "debug"};


        public String[] getValues() {
            return values;
        }
    }


    /**
     * Gets the recorder that's associated with the passed in name. If the
     * recorder doesn't exist, then a new one is created.
     */
    protected RecorderEntry getRecorder(String name, Project proj)
         throws BuildException {
        Object o = recorderEntries.get(name);
        RecorderEntry entry;

        if (o == null) {
            // create a recorder entry
            try {
                entry = new RecorderEntry(name);

                PrintStream out = null;

                if (append == null) {
                    out = new PrintStream(
                        new FileOutputStream(name));
                } else {
                    out = new PrintStream(
                        new FileOutputStream(name, append.booleanValue()));
                }
                entry.setErrorPrintStream(out);
                entry.setOutputPrintStream(out);
            } catch (IOException ioe) {
                throw new BuildException("Problems creating a recorder entry",
                    ioe);
            }
            entry.setProject(proj);
            recorderEntries.put(name, entry);
        } else {
            entry = (RecorderEntry) o;
        }
        return entry;
    }

}