/*
 * 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.tamaya.spisupport;

import org.apache.tamaya.spi.PropertySource;
import org.apache.tamaya.spi.PropertyValue;
import org.apache.tamaya.spisupport.propertysource.SystemPropertySource;
import org.junit.Test;

import java.util.Map;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.fail;

/**
 * Tests for {@link DefaultPropertySourceSnapshot}.
 */
public class DefaultPropertySourceSnapshotTest {

    private static final PropertySource MY_PS = new SystemPropertySource();

    @Test
    public void testOf() throws Exception {
        PropertySource ps = DefaultPropertySourceSnapshot.of(MY_PS);
        assertThat(ps).isNotNull();
    }

    @Test
    public void testGetName() throws Exception {
        PropertySource ps = DefaultPropertySourceSnapshot.of(MY_PS);
        String name = ps.getName();
        assertThat(name).isNotNull();
        assertThat(name).isEqualTo(ps.getName());
    }

    @Test
    public void testGetOrdinal() throws Exception {
        PropertySource ps = DefaultPropertySourceSnapshot.of(MY_PS);
        assertThat(PropertySourceComparator.getOrdinal(MY_PS))
            .isEqualTo(PropertySourceComparator.getOrdinal(ps));
    }

    @Test
    public void testGet() throws Exception {
        PropertySource ps = DefaultPropertySourceSnapshot.of(MY_PS);
        assertThat(ps).isNotNull();
        for (Map.Entry<String, PropertyValue> e : MY_PS.getProperties().entrySet()) {
            assertThat(ps.get(e.getKey()).getValue()).isEqualTo(e.getValue().getValue());
        }
    }

    @Test
    public void testGetProperties() throws Exception {
        PropertySource ps = DefaultPropertySourceSnapshot.of(MY_PS);
        assertThat(ps).isNotNull();
        assertThat(ps.getProperties()).isNotNull();
        assertThat(ps.getProperties()).isNotEmpty();
        for(Map.Entry en:MY_PS.getProperties().entrySet()){
            assertThat(en.getValue()).isEqualTo(ps.get((String)en.getKey()));
        }
    }

    @Test
    public void testEquals() throws Exception {
        PropertySource ps1 = DefaultPropertySourceSnapshot.of(MY_PS);
        PropertySource ps2 = DefaultPropertySourceSnapshot.of(MY_PS);
        assertThat(ps1.getName()).isEqualTo(ps2.getName());
        assertThat(ps1.getProperties()).hasSize(ps2.getProperties().size());
    }

    @Test
    public void testHashCode() throws Exception {
        boolean alwaysDifferent = true;
        for(int i=0;i<10;i++){
            PropertySource ps1 = DefaultPropertySourceSnapshot.of(MY_PS);
            PropertySource ps2 = DefaultPropertySourceSnapshot.of(MY_PS);
            // sometimes not same, because frozenAt in ms maybe different
            if(ps1.hashCode()==ps2.hashCode()){
                alwaysDifferent=false;
                break;
            }
        }
        if(alwaysDifferent){
            fail("HashCode should be same if frozenAt is in the same ms...");
        }
    }

    @Test
    public void testToString() throws Exception {
        PropertySource ps = DefaultPropertySourceSnapshot.of(MY_PS);
        String toString = ps.toString();
        assertThat(toString).isNotNull();
        assertThat(toString).contains("FrozenPropertySource");
        assertThat(toString).contains(MY_PS.getName());
    }
}