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package jeco.core.util.compiler;

import java.io.File;
import java.util.Arrays;
import java.util.Collection;
import java.util.Properties;
import javax.tools.Diagnostic;
import javax.tools.DiagnosticCollector;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;

/**
 * Compiles source and also makes sure that reloading a compiled class
 * does not "caches" the first compiled class.
 * 
 * @author José Luis Risco Martín
 * @author J. M. Colmenar
 */
public class MyCompiler {

    protected StringBuffer console;
    protected String workDir;
    protected String classPathSeparator;

    public MyCompiler(Properties properties) {
        console = new StringBuffer();
        workDir = properties.getProperty("WorkDir");
        classPathSeparator = properties.getProperty("ClassPathSeparator");
    }

    public boolean compile(Collection filePaths) throws Exception {
        console.delete(0, console.length());
        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
        DiagnosticCollector diagnostics = new DiagnosticCollector();
        StandardJavaFileManager fileManager = compiler.getStandardFileManager(diagnostics, null, null);
        Iterable compilationUnits = fileManager.getJavaFileObjectsFromStrings(filePaths);
        String jars = ".";
        File dir = new File(workDir);
        String[] children = dir.list();
        for (String childrenI : children) {
            if (childrenI.indexOf(".jar") >= 0) {
                File file = new File(workDir + File.separator + childrenI);
                jars += classPathSeparator + file.getAbsolutePath();
            }
        }
        JavaCompiler.CompilationTask task = compiler.getTask(null, fileManager, diagnostics, Arrays.asList("-classpath", jars, "-d", workDir), null, compilationUnits);
        boolean success = task.call();
        for (Diagnostic diagnostic : diagnostics.getDiagnostics()) {
            console.append("Code: ");
            console.append(diagnostic.getCode());
            console.append("\n");
            console.append("Kind: ");
            console.append(diagnostic.getKind());
            console.append("\n");
            console.append("Position: ");
            console.append(diagnostic.getPosition());
            console.append("\n");
            console.append("Start Position: ");
            console.append(diagnostic.getStartPosition());
            console.append("\n");
            console.append("End Position: ");
            console.append(diagnostic.getEndPosition());
            console.append("\n");
            console.append("Source: ");
            console.append(diagnostic.getSource());
            console.append("\n");
            console.append("Message: ");
            console.append(diagnostic.getMessage(null));
            console.append("\n");
            console.append("Success: ").append(success).append("\n");
        }
        fileManager.close();
        return success;
    }

    public String getOutput() {
        return console.toString();
    }
    
    public String getWorkDir() {
        return workDir;
    }
}