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****************************************************************************/

#ifndef __CCMAP_H__
#define __CCMAP_H__

#include <vector>
#include <unordered_map>
#include <algorithm>    // std::for_each

NS_CC_BEGIN

/**
 * @addtogroup data_structures
 * @{
 */

template <class K, class V>
class CC_DLL Map
{
public:
    Map<K, V>()
    : _data()
    {
        CCLOGINFO("In the default constructor of Map!");
    }
    
    explicit Map<K, V>(long capacity)
    : _data()
    {
        CCLOGINFO("In the constructor with capacity of Map!");
        _data.reserve(capacity);
    }

    Map<K, V>(const Map<K, V>& other)
    {
        CCLOGINFO("In the copy constructor of Map!");
        _data = other;
        addRefForAllObjects();
    }
    
    Map<K, V>(Map<K, V>&& other)
    {
        CCLOGINFO("In the move constructor of Map!");
        _data = other;
    }
    
    ~Map<K, V>()
    {
        CCLOGINFO("In the destructor of Map!");
        clear();
    }

    /** Sets capacity of current array */
    void reserve(long capacity)
    {
        _data.reserve(capacity);
    }
    
    /** Returns capacity of the array */
    size_t capacity() const
    {
        return _data.capacity();
    }
    
    size_t size() const
    {
        return _data.size();
    }

    bool empty() const
    {
        return _data.empty();
    }
    
    std::vector<K> keys() const
    {
        std::vector<K> keys;

        if (!_data.empty())
        {
            for (auto iter = _data.cbegin(); iter != _data.cend(); ++iter)
            {
                keys.push_back(iter->first);
            }
        }
        return std::move(keys);
    }

    std::vector<K> keys(V object) const
    {
        std::vector<K> keys;
        
        for (auto iter = _data.cbegin(); iter != _data.cend(); ++iter)
        {
            if (iter->second == object)
            {
                keys.push_back(iter->first);
            }
        }
        
        return std::move(keys);
    }

    V at(const K& key) const
    {
        auto iter = _data.find(key);
        if (iter != _data.end())
            return iter->second;
        
        return nullptr;
    }
    
    void insert(const K& key, V object)
    {
        CCASSERT(object != nullptr, "Object is nullptr!");
        remove(key);
        _data.insert(std::make_pair(key, object));
        object->retain();
    }

    void remove(const K& key)
    {
        auto iter = _data.find(key);
        if (iter != _data.end())
        {
            iter->second->release();
            _data.erase(iter);
        }
    }
    
    void remove(const std::vector<K>& keys)
    {
        std::for_each(keys.cbegin(), keys.cend(), [this](const K& key){
            this->remove(key);
        });
    }
    
    void clear()
    {
        for (auto iter = _data.cbegin(); iter != _data.cend(); ++iter)
        {
            iter->second->release();
        }
        
        _data.clear();
    }
    
    V getRandomObject() const
    {
        if (!_data.empty())
        {
            int randIdx = rand() % _data.size();
            return (_data.begin() + randIdx)->second;
        }
        return nullptr;
    }
    
    // ------------------------------------------
    // Iterators
    // ------------------------------------------
    typedef std::unordered_map<K, V> RefMap;
    
    typedef typename RefMap::iterator iterator;
    typedef typename RefMap::const_iterator const_iterator;

    iterator begin() { return _data.begin(); }
    const_iterator begin() const { return _data.begin(); }
    
    iterator end() { return _data.end(); }
    const_iterator end() const { return _data.end(); }
    
    const_iterator cbegin() const { return _data.cbegin(); }
    const_iterator cend() const { return _data.cend(); }
    
// Don't uses operator since we could not decide whether it needs 'retain'/'release'.
//    V& operator[] ( const K& key )
//    {
//        CCLOG("copy: [] ref");
//        return _data[key];
//    }
//    
//    V& operator[] ( K&& key )
//    {
//        CCLOG("move [] ref");
//        return _data[key];
//    }
    
//    const V& operator[] ( const K& key ) const
//    {
//        CCLOG("const copy []");
//        return _data.at(key);
//    }
//    
//    const V& operator[] ( K&& key ) const
//    {
//        CCLOG("const move []");
//        return _data.at(key);
//    }
    
    Map<K, V>& operator= ( const Map<K, V>& other )
    {
        CCLOG("In the copy assignment operator of Map!");
        clear();
        _data = other._data;
        addRefForAllObjects();
    }

    Map<K, V>& operator= ( Map<K, V>&& other )
    {
        CCLOG("In the move assignment operator of Map!");
        _data = std::move(other._data);
    }
    
protected:
    
    void addRefForAllObjects()
    {
        for (auto iter = _data.begin(); iter != _data.end(); ++iter)
        {
            _data->second->retain();
        }
    }
    
    RefMap _data;
};

// end of data_structure group
/// @}

NS_CC_END

#endif /* __CCMAP_H__ */