/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
Copyright (c) 2017-2020 c4games.com.

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****************************************************************************/
#ifndef __SUPPORT_CCUSERDEFAULT_H__
#define __SUPPORT_CCUSERDEFAULT_H__

#include "platform/CCPlatformMacros.h"
#include <string>

#include <unordered_map>
#include "mio/mio.hpp"
#include "yasio/cxx17/string_view.hpp"

/**
 * @addtogroup base
 * @{
 */
NS_CC_BEGIN


/**
 * UserDefault acts as a tiny database. You can save and get base type values by it.
 * For example, setBoolForKey("played", true) will add a bool value true into the database.
 * Its key is "played". You can get the value of the key by getBoolForKey("played").
 * 
 * It supports the following base types:
 * bool, int, float, double, string
 *
 * @warning: On windows, linux, use XML to store data, which means there are some limitations of
 * the key string, for example, `/` is not valid.
 */
class CC_DLL UserDefault
{
public:
    // get value methods

    /**
     * Get bool value by key, if the key doesn't exist, will return false.
     * You can set the default value, or it is false.
     * @param key The key to get value.
     * @return Bool value by `key`.
     * @js NA
     */
    bool    getBoolForKey(const char* key);
    
    /**
     * Get bool value by key, if the key doesn't exist, will return passed default value.
     * @param key The key to get value.
     * @param defaultValue The default value to return if the key doesn't exist.
     * @js NA
     */
    virtual bool getBoolForKey(const char* key, bool defaultValue);
    
    /**
     * Get integer value by key, if the key doesn't exist, will return 0.
     * You can set the default value, or it is 0.
     * @param key The key to get value.
     * @return Integer value of the key.
     * @js NA
     */
    int     getIntegerForKey(const char* key);
    
    /**
     * Get bool value by key, if the key doesn't exist, will return passed default value.
     * @param key The key to get value.
     * @param defaultValue The default value to return if the key doesn't exist.
     * @return Integer value of the key.
     * @js NA
     */
    virtual int getIntegerForKey(const char* key, int defaultValue);
    
    /**
     * Get float value by key, if the key doesn't exist, will return 0.0.
     * @param key The key to get value.
     * @return Float value of the key.
     * @js NA
     */
    float    getFloatForKey(const char* key);
    
    /**
     * Get float value by key, if the key doesn't exist, will return passed default value.
     * @param key The key to get value.
     * @param defaultValue The default value to return if the key doesn't exist.
     * @return Float value of the key.
     * @js NA
     */
    virtual float getFloatForKey(const char* key, float defaultValue);
    
    /**
     * Get double value by key, if the key doesn't exist, will return 0.0.
     * @param key The key to get value.
     * @return Double value of the key.
     * @js NA
     */
    double  getDoubleForKey(const char* key);
    
    /**
     * Get double value by key, if the key doesn't exist, will return passed default value.
     * @param key The key to get value.
     * @param defaultValue The default value to return if the key doesn't exist.
     * @return Double value of the key.
     * @js NA
     */
    virtual double getDoubleForKey(const char* key, double defaultValue);
    
    /**
     * Get string value by key, if the key doesn't exist, will return an empty string.
     * @param key The key to get value.
     * @return String value of the key.
     * @js NA
     */
    std::string getStringForKey(const char* key);
    
    /**
     * Get string value by key, if the key doesn't exist, will return passed default value.
     * @param key The key to get value.
     * @param defaultValue The default value to return if the key doesn't exist.
     * @return String value of the key.
     * @js NA
     */
    virtual std::string getStringForKey(const char* key, const std::string & defaultValue);
    
    // set value methods

    /**
     * Set bool value by key.
     * @param key The key to set.
     * @param value A bool value to set to the key.
     * @js NA
     */
    virtual void setBoolForKey(const char* key, bool value);
    /**
     * Set integer value by key.
     * @param key The key to set.
     * @param value A integer value to set to the key.
     * @js NA
     */
    virtual void setIntegerForKey(const char* key, int value);
    /**
     * Set float value by key.
     * @param key The key to set.
     * @param value A float value to set to the key.
     * @js NA
     */
    virtual void setFloatForKey(const char* key, float value);
    /**
     * Set double value by key.
     * @param key The key to set.
     * @param value A double value to set to the key.
     * @js NA
     */
    virtual void setDoubleForKey(const char* key, double value);
    /**
     * Set string value by key.
     * @param key The key to set.
     * @param value A string value to set to the key.
     * @js NA
     */
    virtual void setStringForKey(const char* key, const std::string & value);

    /**
     * You should invoke this function to save values set by setXXXForKey().
     * @js NA
     */
    virtual void flush();

    /**
    * delete any value by key,
    * @param key The key to delete value.
    * @js NA
    */
    virtual void deleteValueForKey(const char* key);
    
    /** Returns the singleton.
     * @js NA
     * @lua NA
     */
    static UserDefault* getInstance();
    /**
     * @js NA
     */
    static void destroyInstance();

    /**
    * You can inherit from platform dependent implementation of UserDefault, such as UserDefaultAndroid,
    * and use this function to set delegate, then UserDefault will invoke delegate's implementation.
    * For example, your store native data base or other format store.
    *
    * If you don't want to system default implementation after setting delegate, you can just pass nullptr
    * to this function.
    *
    * @warning It will delete previous delegate
    */
    static void setDelegate(UserDefault *delegate);

    /*
    ** @params:
    **   key: 16bytes key
    **   iv: 16bytes iv
    */
    virtual void setEncryptEnabled(bool enabled, const cxx17::string_view& key, const cxx17::string_view& iv);

    /*
    *  Mark encrypt function as virtual, default use AES cfb128 encrypt/decrypt
    *  you can write your own delegate to replace encrypt/decrypt algorithm
    */
    virtual void encrypt(char* inout, size_t size, int enc);

    void encrypt(std::string& inout, int enc);

protected:
    UserDefault();
    virtual ~UserDefault();
    
    void init();

    void closeFileMapping();

    void setValueForKey(const std::string& key, const std::string& value);

protected:

    std::unordered_map<std::string, std::string> _values;
    
    static UserDefault* _userDefault;
    std::string _filePath;
    int _fd = -1; // the file handle for data persistence
    std::shared_ptr<mio::mmap_sink> _rwmmap;
    int _curMapSize = 4096; // init mapsize is 4K
    int _realSize = 0; // real data size without key/value entities count field
    bool _initialized = false;

    // encrpyt args
    bool _encryptEnabled;
    std::string _key;
    std::string _iv;
};


NS_CC_END
// end of base group
/** @} */

#endif // __SUPPORT_CCUSERDEFAULT_H__