package org.apache.maven.test;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.model.Dependency;
import org.apache.maven.project.Project;
import org.codehaus.plexus.util.DirectoryScanner;
import org.codehaus.plexus.util.StringUtils;

import java.io.File;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.util.Iterator;
import java.util.List;

public class TestRunnerBooter
{
    private Project project;

    public void setProject( Project project )
    {
        this.project = project;
    }

    public void execute()
        throws Exception
    {
        // maven.build.dest
        // maven.test.dest

        IsolatedClassLoader classLoader = new IsolatedClassLoader();

        File basedir = project.getFile().getParentFile();

        System.setProperty( "basedir", basedir.getPath() );

        Thread.currentThread().setContextClassLoader( classLoader );

        String mavenRepoLocal = project.getProperty( "maven.repo.local" );

        classLoader.addURL( new File ( mavenRepoLocal, "junit/jars/junit-3.8.1.jar" ).toURL() );

        classLoader.addURL( new File ( mavenRepoLocal, "maven/jars/surefire-runner-1.0.jar" ).toURL() );

        classLoader.addURL( new File( basedir, "target/classes/" ).toURL() );

        classLoader.addURL( new File( basedir, "target/test-classes/" ).toURL() );

        processDependencies( project, classLoader );

        String[] tests = collectTests( basedir,
                                       project.getBuild().getUnitTest().getIncludes(),
                                       project.getBuild().getUnitTest().getExcludes() );

        Class testRunnerClass = classLoader.loadClass( "org.apache.maven.test.TestRunner" );

        Object testRunner = testRunnerClass.newInstance();

        Method m = testRunnerClass.getMethod( "runTestClasses", new Class[] {
            ClassLoader.class,
            String[].class
        } );

        m.invoke( testRunner, new Object[]{
            classLoader,
            tests
        } );
    }

    // We need to deal with populating a plugin classloader with its requirements.
    private void processDependencies( Project project, IsolatedClassLoader classLoader )
        throws MalformedURLException
    {
        if ( project.getArtifacts() == null )
        {
            return;
        }

        for ( Iterator i = project.getArtifacts().iterator(); i.hasNext(); )
        {
            Artifact artifact = (Artifact) i.next();

            Dependency dependency = artifact.getDependency();

            // Only add compile type dependencies to classloader
            if ( dependency.getType().equals( "jar" ) )
            {
                // We have the jar and the classloader to push it into so
                // lets do it!
                if ( artifact.exists() )
                {
                    classLoader.addURL( artifact.getFile().toURL() );
                }
            }
        }
    }

    public String[] collectTests( File basedir, List includes, List excludes )
        throws Exception
    {
        DirectoryScanner scanner = new DirectoryScanner();

        scanner.setBasedir( new File( basedir, "target/test-classes" ) );

        String[] incs = new String[includes.size()];

        for ( int i = 0; i < incs.length; i++ )
        {
            incs[i] = StringUtils.replace( (String) includes.get( i ), "java", "class" );
        }

        scanner.setIncludes( incs );

        String[] excls = new String[excludes.size() + 1];

        for ( int i = 0; i < excls.length - 1; i++ )
        {
            excls[i] = StringUtils.replace( (String) excludes.get( i ), "java", "class" );
        }

        // Exclude inner classes

        excls[excludes.size()] = "**/*$*";

        scanner.setExcludes( excls );

        scanner.scan();

        return scanner.getIncludedFiles();
    }
}