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package org.reflections;

import com.google.common.base.Supplier;
import com.google.common.collect.*;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

/**
 * stores metadata information in multimaps
 * use the different query methods (getXXX) to query the metadata
 * 
the query methods are string based, and does not cause the class loader to define the types
 * use {@link org.reflections.Reflections#getStore()} to access this store
 */
public class Store {

    private transient boolean concurrent;
    private final Map> storeMap;

    //used via reflection
    @SuppressWarnings("UnusedDeclaration")
    protected Store() {
        storeMap = new HashMap>();
        concurrent = false;
    }

    public Store(Configuration configuration) {
        storeMap = new HashMap>();
        concurrent = configuration.getExecutorService() != null;
    }

    /** return all indices */
    public Set keySet() {
        return storeMap.keySet();
    }

    /** get or create the multimap object for the given {@code index} */
    public Multimap getOrCreate(String index) {
        Multimap mmap = storeMap.get(index);
        if (mmap == null) {
            SetMultimap multimap =
                    Multimaps.newSetMultimap(new HashMap>(),
                            new Supplier>() {
                                public Set get() {
                                    return Sets.newSetFromMap(new ConcurrentHashMap());
                                }
                            });
            mmap = concurrent ? Multimaps.synchronizedSetMultimap(multimap) : multimap;
            storeMap.put(index,mmap);
        }
        return mmap;
    }

    /** get the multimap object for the given {@code index}, otherwise throws a {@link org.reflections.ReflectionsException} */
    public Multimap get(String index) {
        Multimap mmap = storeMap.get(index);
        if (mmap == null) {
            throw new ReflectionsException("Scanner " + index + " was not configured");
        }
        return mmap;
    }

    /** get the values stored for the given {@code index} and {@code keys} */
    public Iterable get(String index, String... keys) {
        return get(index, Arrays.asList(keys));
    }

    /** get the values stored for the given {@code index} and {@code keys} */
    public Iterable get(String index, Iterable keys) {
        Multimap mmap = get(index);
        IterableChain result = new IterableChain();
        for (String key : keys) {
            result.addAll(mmap.get(key));
        }
        return result;
    }

    /** recursively get the values stored for the given {@code index} and {@code keys}, including keys */
    private Iterable getAllIncluding(String index, Iterable keys, IterableChain result) {
        result.addAll(keys);
        for (String key : keys) {
            Iterable values = get(index, key);
            if (values.iterator().hasNext()) {
                getAllIncluding(index, values, result);
            }
        }
        return result;
    }

    /** recursively get the values stored for the given {@code index} and {@code keys}, not including keys */
    public Iterable getAll(String index, String key) {
        return getAllIncluding(index, get(index, key), new IterableChain());
    }

    /** recursively get the values stored for the given {@code index} and {@code keys}, not including keys */
    public Iterable getAll(String index, Iterable keys) {
        return getAllIncluding(index, get(index, keys), new IterableChain());
    }

    private static class IterableChain implements Iterable {
        private final List> chain = Lists.newArrayList();

        private void addAll(Iterable iterable) { chain.add(iterable); }

        public Iterator iterator() { return Iterables.concat(chain).iterator(); }
    }
}