/**
 * @file include/di/Redis.h
 * @brief Redis wrapper class
 * @date May 29, 2015
 * @author R.W.A. van der Heijden
 * @copyright 2015 Dual Inventive Technology Centre B.V.
 *
 * Class which wraps Redis interface
 */
#ifndef INCLUDE_DI_REDIS_H_
#define INCLUDE_DI_REDIS_H_

#include <vector>
#include <string>
#include <cstdarg>
#include <cstdint>
#include <mutex>

struct redisContext;
typedef struct redisContext redisContext;
struct redisReply;
typedef struct redisReply redisReply;

namespace Di {

/**
 * @class Redis
 *
 * Redis wrapper class
 */
class Redis {
 public:
	enum Event {
		EV_OK,
		EV_ERROR,
		EV_TIMEOUT
	};

	Redis(std::string hostname, int port);
	~Redis();

	bool connect(uint16_t timeout_sec);
	bool disconnect();
	bool connected(void);

	bool ping(void);

	bool keys(const std::string filter, std::vector<std::string> *values);

	bool hset(std::string field, const std::string key, const std::string value);
	bool hget(std::string field, const std::string &key, std::string *value);
	bool hmget(std::string field, const std::vector<std::string> &requestedKeys,
		   std::vector<std::string> *values);
	bool hincrby(std::string field, const std::string key, int64_t increment);
	bool hdecrby(std::string field, const std::string key, int64_t decrement);

	bool set(std::string key, const std::string &value);
	bool setex(std::string key, const std::string value, unsigned int expireSec);
	bool get(std::string key, std::string *value);
	bool persist(std::string key);
	bool incrby(std::string key, int64_t increment);
	bool decrby(std::string key, int64_t decrement);

	bool publish(const std::string &chan, const std::string &msg);
	bool psubscribe(const std::string pattern);
	bool readEvent(std::string *event, std::string *data);
	enum Redis::Event readEvent(std::string *event, std::string *data, int timeout);
	void setKeyPrefix(const std::string &prefix);

 private:
	redisContext *ctx;
	std::string __hostname;
	int __port;
	std::string __keyPrefix;
	std::mutex __lock;

	redisReply *redisCommand(const char *format, ...);
	redisReply *__redisCommandArgv(size_t argc, const char **argv, const size_t *argvlen);
	int redisSelect(redisContext *c, int *readev, int timeout);
};

}  // namespace Di

#endif  // INCLUDE_DI_REDIS_H_