/**
 * @file di/Configuration.h
 * @brief Configuration loading from JSON file
 * @date June 2, 2015
 * @author J.J.J. Jacobs, R.W.A. van der Heijden
 * @copyright 2015 Dual Inventive Technology Centre B.V.
 */
#ifndef INCLUDE_DI_CONFIGURATION_H_
#define INCLUDE_DI_CONFIGURATION_H_

#include <string>
#include <vector>
#include <memory>

#include <di/Json.h>

namespace Di {

/**
 * @class Configuration
 *
 * loads settings from a JSON file.
 *  It supports documenting the configuration with C99-style single
 *  and multiline comments.
 * Searches automatic in the following paths (in the given order):
 *  - ../
 *  - /etc/di
 *  - /usr/local/etc/di
 *  - /opt/di/etc/
 *  - /tmp/di/etc
 */
class Configuration {
 public:
	Configuration();

	/** Try to load filename, will search in default paths */
	bool load(std::string filename);
	/** Try to load filename, search can be enabled/disabled */
	bool load(std::string filename, bool search);
	/** Save default configuration to file */
	bool save(std::string filename);

	bool getProperty(const std::string &key, bool *value);
	bool getProperty(const std::string &key, std::string *value);
	bool getProperty(const std::string &key, double *value);
	bool getProperty(const std::string &key, int *value);
	bool getProperty(const std::string &key, int64_t *value);
	bool getArrayProperty(const std::string &key, std::shared_ptr<Json> *value);

	void setDefaultProperty(const std::string &key, bool value);
	void setDefaultProperty(const std::string &key, const char *value);
	void setDefaultProperty(const std::string &key, const std::string &value);
	void setDefaultProperty(const std::string &key, double value);
	void setDefaultProperty(const std::string &key, int64_t value);
	void setDefaultProperty(const std::string &key, const std::shared_ptr<Json> &value);

 private:
	std::shared_ptr<Json> loaded;
	std::shared_ptr<Json> defaults;

	bool __getProperty(std::shared_ptr<Json> root, const std::string &key, bool *value);
	bool __getProperty(std::shared_ptr<Json> root, const std::string &key, std::string *value);
	bool __getProperty(std::shared_ptr<Json> root, const std::string &key, double *value);
	bool __getProperty(std::shared_ptr<Json> root, const std::string &key, int *value);
	bool __getProperty(std::shared_ptr<Json> root, const std::string &key, int64_t *value);
	bool __getArrayProperty(std::shared_ptr<Json> root, const std::string &key, std::shared_ptr<Json> *value);

	bool __searchFile(const std::string &filename, const std::vector<std::string> &paths, std::string *filepath);
	bool __fileExists(const std::string &filepath);
};

}  // namespace Di


#endif  // INCLUDE_DI_CONFIGURATION_H_