package org.apidesign.unionfs;

import java.util.Arrays;

import java.util.HashSet;

import java.util.Set;

import org.junit.After;

import org.junit.AfterClass;

import org.junit.Before;

import org.junit.BeforeClass;

import org.junit.Test;

import org.openide.filesystems.FileObject;

import static org.junit.Assert.*;

import org.openide.filesystems.FileSystem;

import org.xml.sax.SAXException;

public class UnionFSTest {

    public UnionFSTest() {

    }

    @BeforeClass

    public static void setUpClass() throws Exception {

    }

    @AfterClass

    public static void tearDownClass() throws Exception {

    }

    @Before

    public void setUp() {

    }

    @After

    public void tearDown() {

    }

    @Test

    public void union() throws SAXException {

        FileSystem one = UnionFS.fromResource(UnionFSTest.class.getResource("fs-one.xml"));

        assertChildren("There is just one file in the folder", one, "Menu", "Open.instance");

        FileSystem two = UnionFS.fromResource(UnionFSTest.class.getResource("fs-two.xml"));

        assertChildren("There is just one file in the other folder", two, "Menu", "Close.instance");

        FileSystem union = UnionFS.union(one, two);

        assertChildren("There both in the union", union, "Menu", "Open.instance", "Close.instance");

    }

    private static void assertChildren(String msg, FileSystem fs, String folder, String... expect) {

        Set<String> names = new HashSet<String>();

        names.addAll(Arrays.asList(expect));

        FileObject fo = fs.getRoot().getFileObject(folder);

        assertNotNull(msg + " folder " + folder + " has to exist", fo);

        for (FileObject ch : fo.getChildren()) {

            names.remove(ch.getNameExt());

        }

        if (!names.isEmpty()) {

            fail(msg + " - expected files not found " + names);

        }

    }

}