package velocidoc;

import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Category;
import org.apache.log4j.Priority;

import java.io.File;
import java.io.IOException;
import java.io.LineNumberReader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/** A process to load the template-tree and detect particular patterns, currently
 *  only the parameter redefinitions. Usage
 *  java -classpath ... VelociAnalyzer --sourcepath _root-dir_
 */
public class VelociAnalyzer {
    public Category log = Category.getInstance("velocidoc");
    private static final ThreadLocal<VelociAnalyzer> velociAnalyzers = new ThreadLocal<VelociAnalyzer>();

    boolean justticked = false;
    private String sourcePath = null;
    private String destinationPath = null;
    private String templatePath = null;
    private boolean debug = false;
    /**
     * default constructor, does nothing
     */
    public VelociAnalyzer() {
        velociAnalyzers.set(this);
        log.setPriority(Priority.ERROR);
    }

    /**
     * Generates the documentation
     *
     */
    public List execute() {
        velociAnalyzers.set(this);
        List errors = validateConfiguration();
        tick();
        if (errors.size() > 0) return errors;

        File sourceDirectory = new File(this.sourcePath);
        tick();
        // parse the file
        RootDoc rootDoc = new RootDoc(sourceDirectory);
        try {
            for(MacroDoc macroDoc: rootDoc.getAllMacros()) {
                //System.out.println("MacroDoc: " + macroDoc);
                checkMacro(macroDoc);
            }
            System.err.flush();
        } catch (Exception exception) {
            log.debug("validateConfiguration",exception);
            errors.add(exception.toString());
        }
        return errors;
    }

    private void checkMacro(MacroDoc macroDoc) {

        for(String p: macroDoc.arguments) {
            if(p.startsWith("$")) p = p.substring(1);
            //System.out.println(" param: " + p);
            Pattern pattern = Pattern.compile("\\#set\\s*\\(\\s*\\$"+p+"\\s*=.*\\)");
            LineNumberReader input =new LineNumberReader(new StringReader(macroDoc.getBody()));
            String line = null; int lineNum = 0;
            try {
                while((line=input.readLine())!=null) {
                    Matcher matcher = pattern.matcher(line);
                    if(matcher.find()) {
                        System.err.print(macroDoc.getTemplate());
                        System.err.print(":" + (lineNum+macroDoc.getBodyBeginLine()) + ":");
                        System.err.println(" " + " parameter \""+p+"\" is set: " + line );
                    }
                    lineNum++;
                }
            } catch (IOException e) { e.printStackTrace(); }
        }
        //System.out.println("   body: " + macroDoc.getBody().trim());

    }

    private static final void parseArguments(String[] args, VelociAnalyzer compiler) {
        for (int i=0;i < args.length; i++) {
            String a = args[i];
            if (a.equals("--sourcepath") || a.equals("-s")) {
                compiler.setSourcePath(args[i+1]);
            } else if (a.equals("-g") || a.equals("--debug")) {
                compiler.setDebug(true);
            } else if (a.equals("-h") || a.equals("--help")) {
                printUsage();
                System.exit(0);
                // do nothing
            }
        }
    }

    public List validateConfiguration() {
        List errors = new ArrayList();
        try {
            File src = new File(sourcePath);
            if (!src.exists()) errors.add("the source directory does not exist");
            if (!src.canRead()) errors.add("the source directory is not writable");
        } catch (Exception e) {
            log.debug("validateConfiguration",e);
            errors.add(e.toString());
        }
        return errors;
    }

    public static void main(String[] args) {
        BasicConfigurator.configure();
        VelociAnalyzer velociAnalyzer = new VelociAnalyzer();
        parseArguments(args, velociAnalyzer);

        List errors = velociAnalyzer.execute();
        if (errors.size() > 0) {
            printUsage();
            System.err.println("errors");
            System.err.println(errors);
            System.exit(1);
        } else {
            System.out.println("done");
            System.exit(0);
        }
    }
    /**
     * prints the usage statement
     */
    public static void printUsage() {
        StringBuffer sb = new StringBuffer();
        sb.append("--------------------------------------------------");
        sb.append("\nVelociAnalyzer - Based on Velocidoc v1.0 - http://velocidoc.sourceforge.net");
        sb.append("\n By Trever M. Shick trevershick@yahoo.com");
        sb.append("\n Other OS Projects:");
        sb.append("\n  http://xjr.sourceforge.net");
        sb.append("\n  http://jpilot-db.sourceforge.net");
        sb.append("\n  http://outline.sourceforge.net");
        sb.append("\n--------------------------------------------------");
        sb.append("\n\n");
        sb.append("\n\nUsage:");
        sb.append("\n  <velocianalyzer> --sourcepath <directory>  [--debug] [--help]");
        sb.append("\n\n  <velocianalyzer> -s <directory> [-g] [-h]");
        sb.append("\n\n  REQUIRED ARGUMENTS");
        sb.append("\n    --sourcepath|-s - the root directory of the templates");
        sb.append("\n  OPTIONAL ARGUMENTS");
        sb.append("\n    --debug|-g - print debug output");
        sb.append("\n    --help|-h - print this message\n\n");
        System.err.println(sb);
    }
    public void tick() {
        System.out.print(".");
        justticked = true;
    }

    public void out(Object obj) {
        if (justticked) System.out.println("\n");
        System.out.println(obj);
        justticked = false;
    }
    /**
     *
     */
    public void setSourcePath(String newSourcePath) {
        sourcePath = newSourcePath;
    }

    /**
     *
     */
    public String getSourcePath() {
        return sourcePath;
    }

    public void setDebug(boolean newDebug) {
        debug = newDebug;
        log.setPriority(Priority.DEBUG);
    }

    public static VelociAnalyzer get() {
        if (velociAnalyzers.get() == null) {
            velociAnalyzers.set(new VelociAnalyzer());
        }
        return velociAnalyzers.get();
    }

    public boolean isDebug() {
        return debug;
    }
    public static void debug(Object obj) {
        get().log.debug(obj);
    }
    public static void debug(Object o, Exception e) {
        get().log.debug(o,e);
    }
    public static boolean isDebugging() {
        return (get().log.getPriority() == Priority.DEBUG);
    }
}