/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.brooklyn.core.mgmt.internal;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertNotEquals;

import java.io.File;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.brooklyn.api.location.Location;
import org.apache.brooklyn.api.mgmt.ManagementContext.PropertiesReloadListener;
import org.apache.brooklyn.core.internal.BrooklynProperties;
import org.apache.brooklyn.core.internal.BrooklynProperties.Factory.Builder;
import org.apache.brooklyn.core.mgmt.internal.LocalManagementContext;
import org.apache.brooklyn.core.test.entity.LocalManagementContextForTests;
import org.apache.brooklyn.util.os.Os;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

import com.google.common.base.Charsets;
import com.google.common.io.Files;

public class LocalManagementContextTest {
    
    private LocalManagementContext context; 
    private File globalPropertiesFile;
    
    @BeforeMethod(alwaysRun=true)
    public void setUp() throws Exception {
        context = null;
        globalPropertiesFile = Os.newTempFile(getClass(), "global.properties");
    }
    
    @AfterMethod(alwaysRun=true)
    public void tearDown() throws Exception {
        if (context!=null) context.terminate();
        if (globalPropertiesFile != null) globalPropertiesFile.delete();
    }
    
    @Test
    public void testReloadPropertiesFromBuilder() throws IOException {
        String globalPropertiesContents = "brooklyn.location.localhost.displayName=myname";
        Files.write(globalPropertiesContents, globalPropertiesFile, Charsets.UTF_8);
        Builder propsBuilder = new BrooklynProperties.Factory.Builder()
            .globalPropertiesFile(globalPropertiesFile.getAbsolutePath());
        // no builder support in LocalManagementContextForTests (we are testing that the builder's files are reloaded so we need it here)
        context = new LocalManagementContext(propsBuilder);
        Location location = context.getLocationRegistry().resolve("localhost");
        assertEquals(location.getDisplayName(), "myname");
        String newGlobalPropertiesContents = "brooklyn.location.localhost.displayName=myname2";
        Files.write(newGlobalPropertiesContents, globalPropertiesFile, Charsets.UTF_8);
        context.reloadBrooklynProperties();
        Location location2 = context.getLocationRegistry().resolve("localhost");
        assertEquals(location.getDisplayName(), "myname");
        assertEquals(location2.getDisplayName(), "myname2");
    }
    
    @Test
    public void testReloadPropertiesFromProperties() throws IOException {
        String globalPropertiesContents = "brooklyn.location.localhost.displayName=myname";
        Files.write(globalPropertiesContents, globalPropertiesFile, Charsets.UTF_8);
        BrooklynProperties brooklynProperties = new BrooklynProperties.Factory.Builder()
            .globalPropertiesFile(globalPropertiesFile.getAbsolutePath())
            .build();
        context = LocalManagementContextForTests.builder(true).useProperties(brooklynProperties).build();
        Location location = context.getLocationRegistry().resolve("localhost");
        assertEquals(location.getDisplayName(), "myname");
        String newGlobalPropertiesContents = "brooklyn.location.localhost.displayName=myname2";
        Files.write(newGlobalPropertiesContents, globalPropertiesFile, Charsets.UTF_8);
        context.reloadBrooklynProperties();
        Location location2 = context.getLocationRegistry().resolve("localhost");
        assertEquals(location.getDisplayName(), "myname");
        assertEquals(location2.getDisplayName(), "myname");
    }
    
    @Test
    public void testPropertiesModified() throws IOException {
        BrooklynProperties properties = BrooklynProperties.Factory.newEmpty();
        properties.put("myname", "myval");
        context = LocalManagementContextForTests.builder(true).useProperties(properties).build();
        assertEquals(context.getBrooklynProperties().get("myname"), "myval");
        properties.put("myname", "newval");
        assertEquals(properties.get("myname"), "newval");
        // TODO: Should changes in the 'properties' collection be reflected in context.getBrooklynProperties()?
        assertNotEquals(context.getBrooklynProperties().get("myname"), "newval");
    }
    
    @Test
    public void testAddAndRemoveReloadListener() {
        final AtomicInteger reloadedCallbackCount = new AtomicInteger(0);
        BrooklynProperties properties = BrooklynProperties.Factory.newEmpty();
        properties.put("myname", "myval");
        context = LocalManagementContextForTests.builder(true).useProperties(properties).build();
        PropertiesReloadListener listener = new PropertiesReloadListener() {
            public void reloaded() {
                reloadedCallbackCount.incrementAndGet();
            }
        };
        assertEquals(reloadedCallbackCount.get(), 0);
        context.addPropertiesReloadListener(listener);
        context.reloadBrooklynProperties();
        assertEquals(reloadedCallbackCount.get(), 1);
        context.removePropertiesReloadListener(listener);
        context.reloadBrooklynProperties();
        assertEquals(reloadedCallbackCount.get(), 1);
    }
}