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/**
 * Copyright 2015 Netflix, Inc.
 *
 * Licensed 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 com.netflix.archaius.config;

import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.function.BiConsumer;

/**
 * Config backed by an immutable map.
 */
public class MapConfig extends AbstractConfig {

    /**
     * The builder only provides convenience for fluent style adding of properties
     * 
     * {@code
     *      * MapConfig.builder()
     *      .put("foo", "bar")
     *      .put("baz", 123)
     *      .build()
     * 
     * }
     */
    public static class Builder {
        Map map = new HashMap<>();
        String named;
        
        public  Builder put(String key, T value) {
            map.put(key, value.toString());
            return this;
        }
        
        public  Builder putAll(Map props) {
            map.putAll(props);
            return this;
        }
        
        public  Builder putAll(Properties props) {
            props.forEach((k, v) -> map.put(k.toString(), v.toString()));
            return this;
        }
        
        public Builder name(String name) {
            this.named = name;
            return this;
        }
        
        public MapConfig build() {
            return new MapConfig(named == null ? generateUniqueName("immutable-") : named, map);
        }
    }
    
    public static Builder builder() {
        return new Builder();
    }
    
    public static MapConfig from(Properties props) {
        return new MapConfig(props);
    }
    
    public static MapConfig from(Map props) {
        return new MapConfig(props);
    }
    
    private final Map props;
    
    public MapConfig(String name, Map props) {
        super(name);
        this.props = Collections.unmodifiableMap(new HashMap<>(props));
    }

    /**
     * Construct a MapConfig as a copy of the provided Map
     * @param name
     * @param props
     */
    public MapConfig(Map props) {
        super(generateUniqueName("immutable-"));
        this.props = Collections.unmodifiableMap(new HashMap<>(props));
    }

    /**
     * Construct a MapConfig as a copy of the provided properties
     * @param props
     */
    public MapConfig(Properties props) {
        super(generateUniqueName("immutable-"));
        Map properties = new HashMap<>();
        for (Entry entry : props.entrySet()) {
            properties.put(entry.getKey().toString(), entry.getValue().toString());
        }
        this.props = Collections.unmodifiableMap(properties);
    }
    
    @Override
    public Object getRawProperty(String key) {
        return props.get(key);
    }

    @Override
    public boolean containsKey(String key) {
        return props.containsKey(key);
    }

    @Override
    public boolean isEmpty() {
        return props.isEmpty();
    }

    @Override
    public Iterator getKeys() {
        return props.keySet().iterator();
    }

    @Override
    public Iterable keys() {
        return props.keySet();
    }

    @Override
    public void forEachProperty(BiConsumer consumer) {
        props.forEach(consumer);
    }
}