ConfiguratorTemplate.h

/*
 * ConfiguratorTemplate.h
 *
 *  Created on: 13.01.2018
 *      Author: Micha Mueller
 */

#ifndef SRC_CONFIGURATORTEMPLATE_H_
#define SRC_CONFIGURATORTEMPLATE_H_

#include <map>

#include <boost/foreach.hpp>
#include <boost/algorithm/string.hpp>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/info_parser.hpp>
#include "ConfiguratorInterface.h"
#include "SensorBase.h"
#include "SensorGroupTemplate.h"

//#define STRCMP(node,str) boost::iequals(node.first,str) //DEPRECATED
#define CFG_TREE	boost::property_tree::iptree&

#define ADD						BOOST_FOREACH(boost::property_tree::iptree::value_type &val, config)
#define ATTRIBUTE(name,setter)		if (boost::iequals(val.first, name)) { s.setter(val.second.data()); }

/**
 * Non-virtual interface template for the configurators.
 */
template <class SBase, class SGroup, class SEntity = nullptr_t>
class ConfiguratorTemplate : public ConfiguratorInterface {
	//the template shall only be instantiated for classes which derive from SensorBase/SensorGroup
	static_assert(std::is_base_of<SensorBase, SBase>::value, "SBase must derive from SensorBase!");
	static_assert(std::is_base_of<SensorGroupInterface, SGroup>::value, "SGroup must derive from SensorGroupInterface!");

protected:
	typedef std::map<std::string, SGroup*> sGroupMap_t;
	typedef std::map<std::string, SEntity*> sEntityMap_t;

public:
	ConfiguratorTemplate() :
		_entityName("INVALID"),
		_groupName("INVALID"),
		_baseName("INVALID"),
		_cfgPath(""),
		_mqttPrefix(""),
		_cacheInterval(900000) {}

	ConfiguratorTemplate(const ConfiguratorTemplate&) = delete;

	virtual ~ConfiguratorTemplate() {
		for (auto g : _sensorGroups) {
			delete g;
		}
		for (auto e : _sensorEntitys) {
			delete e;
		}
		for (auto tg : _templateSensorGroups) {
			delete tg.second;
		}
		for (auto te : _templateSensorEntitys) {
			delete te.second;
		}
		_sensorGroups.clear();
		_sensorEntitys.clear();
		_templateSensorGroups.clear();
		_templateSensorEntitys.clear();
	}

	ConfiguratorTemplate& operator=(const ConfiguratorTemplate&) = delete;

	/**
	 * Read in the given configuration
	 *
	 * @param	cfgPath Path to the config-file
	 *
	 * @return	True on success, false otherwise
	 */
	bool readConfig(std::string cfgPath) final {
		_cfgPath = cfgPath;

		boost::property_tree::iptree cfg;
		boost::property_tree::read_info(cfgPath, cfg);

		//read global variables (if present overwrite those from global.conf)
		readGlobal(cfg);

		//read groups and templates for groups. If present also entity/-template stuff
		BOOST_FOREACH(boost::property_tree::iptree::value_type &val, cfg) {
			//TODO allow for template sensors?
			//TODO allow single sensors for convenience?
			//template entity
			if (boost::iequals(val.first, "template_" + _entityName)) {
				LOG(debug) << "Template " << _entityName << " \"" << val.second.data() << "\"";
				if (!val.second.empty()) {
//TODO how to handle Entity at compile time?
//possible solutions: preprocessor defines (ugly), partial template specialization(code duplication), inheritance (complicated structure)
#if 0
					SEntity* entity = new SEntity(val.second.data());
					if (readSensorEntity(*entity, val.second)) {
						auto ret = _templateSensorEntitys.insert(std::pair<std::string, SEntity*>(val.second.data(), entity));
						if(!ret.second) {
							LOG(warning) << "Template " << _entityName << " " << val.second.data() << " already exists! Omitting...";
						}
					} else {
						LOG(warning) << "Template " << _entityName << " \"" << val.second.data() << "\" has bad values! Ignoring...";
					}
#endif
				}
			//template group
			} else if (boost::iequals(val.first, "template_" + _groupName)) {
				LOG(debug) << "Template " << _groupName << " \"" << val.second.data() << "\"";
				if (!val.second.empty()) {
					SGroup* group = new SGroup(val.second.data());
					if (readSensorGroup(*group, val.second)) {
						auto ret = _templateSensorGroups.insert(std::pair<std::string, SGroup*>(val.second.data(), group));
						if(!ret.second) {
							LOG(warning) << "Template " << _groupName << " " << val.second.data() << " already exists! Omitting...";
						}
					} else {
						LOG(warning) << "Template " << _groupName << " \"" << val.second.data() << "\" has bad values! Ignoring...";
					}
				}
			//entity
			} else if (boost::iequals(val.first, _entityName)) {
				LOG(debug) << _entityName << " \"" << val.second.data() << "\"";
				if (!val.second.empty()) {
#if 0
					SEntity* entity = new SEntity(val.second.data());
					if (readSensorEntity(*entity, val.second)) {
						_sensorEntitys.push_back(entity);
					} else {
						LOG(warning) << _entityName << " \"" << val.second.data() << "\" has bad values! Ignoring...";
					}
#endif
				}
			//group
			} else if (boost::iequals(val.first, _groupName)) {
				LOG(debug) << _groupName << " \"" << val.second.data() << "\"";
				if (!val.second.empty()) {
					SGroup* group = new SGroup(val.second.data());
					if (readSensorGroup(*group, val.second)) {
						_sensorGroups.push_back(group);
					} else {
						LOG(warning) << _groupName << " \"" << val.second.data() << "\" has bad values! Ignoring...";
					}
				}
			}
		}
		//read of config finished. Now we build the mqtt-topic for every sensor
		for(auto g : _sensorGroups) {
			for(auto s : g->getSensors()) {
				s->setMqtt(_mqttPrefix + g->getMqttPart() + s->getMqtt());
			}
		}
		return true;
	}

	/**
	 * Clear internal storage and read in the configuration again.
	 *
	 * @return	True on success, false otherwise
	 */
	bool reReadConfig() final {
		//bring everything to a halt
		for(auto g : _sensorGroups) {
			g->stop();
		}

		//wait until everything is halted
		for(auto g : _sensorGroups) {
			g->wait();
		}

		//clean up sensors/groups/entitys and templates
		for(auto g : _sensorGroups) {
			delete g;
		}
		for(auto e : _sensorEntitys) {
			delete e;
		}
		for (auto tg : _templateSensorGroups) {
			delete tg.second;
		}
		for (auto te : _templateSensorEntitys) {
			delete te.second;
		}
		_sensorGroups.clear();
		_sensorEntitys.clear();
		_templateSensorGroups.clear();
		_templateSensorEntitys.clear();

		//back to the very beginning
		return readConfig(_cfgPath);
	}

	/**
	 * Sets internal variables with the ones provided by pluginSettings.
	 * This method should be called once after constructing a configurator
	 * to provide him with the global default values.
	 *
	 * @param pluginSettings	Struct with global default settings for the plugins.
	 */
	void setGlobalSettings(const pluginSettings_t& pluginSettings) final {
		_mqttPrefix = pluginSettings.mqttPrefix;
		_cacheInterval = pluginSettings.cacheInterval;

		derivedSetGlobalSettings(pluginSettings);
	}

	/**
	 * Get all sensor groups
	 *
	 * @return	Vector containing pointers to all sensor groups of this plugin
	 */
	std::vector<SensorGroupInterface*>& getSensorGroups() {
		return _sensorGroups;
	}

protected:
	/**
	 * Non-virtual interface method for class-internal use only.
	 * Reads and sets the common base values of a sensor base (currently none),
	 * then calls the corresponding derived function to read plugin specific
	 * values.
	 *
	 * @param sBase		The sensor base for which to set the values
	 * @param config	A boost property (sub-)tree containing the sensor values
	 *
	 * @return	True on success, false otherwise
	 */
	bool readSensorBase(SBase& sBase, boost::property_tree::iptree& config) {
		//TODO default templates useful?
		BOOST_FOREACH(boost::property_tree::iptree::value_type &val, config) {
			if (boost::iequals(val.first, "mqttsuffix")) {
				sBase.setMqtt(val.second.data());
			}
		}
		sensorBase(sBase, config);
		return true;
	}

	/**
	 * Non-virtual interface method for class-internal use only.
	 * Reads and sets the common base values of a sensor group, then calls
	 * the corresponding derived function to read in plugin specific values.
	 *
	 * @param sGroup	The sensor group for which to set the values
	 * @param config	A boost property (sub-)tree containing the sensor values
	 *
	 * @return	True on success, false otherwise
	 */
	bool readSensorGroup(SGroup& sGroup, boost::property_tree::iptree& config) {
		sGroup.setCacheInterval(_cacheInterval);
		//first check if default group is given
		boost::optional<boost::property_tree::iptree&> def = config.get_child_optional("default");
		if(def) {
			//we copy all values from default (including copy constructing its sensors)
			//if own sensors are specified they are appended
			LOG(debug) << "  Using \"" << def.get().data() << "\" as default.";
			auto it = _templateSensorGroups.find(def.get().data());
			if(it != _templateSensorGroups.end()) {
				sGroup = *(it->second);
				sGroup.setGroupName(config.data());
			} else {
				LOG(warning) << "Template " << _groupName << "\"" << def.get().data() << "\" not found! Using standard values.";
			}
		}

		//read in values inherited from SensorGroupInterface
		BOOST_FOREACH(boost::property_tree::iptree::value_type &val, config) {
			if (boost::iequals(val.first, "interval")) {
				sGroup.setInterval(stoull(val.second.data()));
			} else if (boost::iequals(val.first, "minValues")) {
				sGroup.setMinValues(stoull(val.second.data()));
			} else if (boost::iequals(val.first, "mqttPart")) {
				sGroup.setMqttPart(val.second.data());
			} else if (boost::iequals(val.first, _baseName)) {
				LOG(debug) << "  " << _baseName << " " << val.second.data();
				SBase* sensor = new SBase(val.second.data());
				if (readSensorBase(*sensor, val.second)) {
					sGroup.pushBackSensor(sensor);
				} else {
					LOG(warning) << _baseName << " " << sGroup.getGroupName() << "::" << sensor->getName() << " could not be read! Omitting";
				}
			}
		}

		//TODO keep debug logging for config?
//		LOG(debug) << "  Interval : " << sGroup.getInterval();
//		LOG(debug) << "  minValues: " << sGroup.getMinValues();

		sensorGroup(sGroup, config);
		return true;
	}

	/**
	 * Non-virtual interface method for class-internal use only.
	 * Reads and sets the common base values of a sensor entity, then calls
	 * the corresponding derived function to read in plugin specific values.
	 *
	 * @param sEntity	The aggregating entity for which to set the values
	 * @param config	A boost property (sub-)tree containing the sensor values
	 *
	 * @return	True on success, false otherwise
	 */
	bool readSensorEntity(SEntity& sEntity, boost::property_tree::iptree& config) {
		//first check if default entity is given
		boost::optional<boost::property_tree::iptree&> def = config.get_child_optional("default");
		if(def) {
			//we copy all values from default
			LOG(debug) << "  Using \"" << def.get().data() << "\" as default.";
			auto it = _templateSensorEntitys.find(def.get().data());
			if(it != _templateSensorEntitys.end()) {
				sEntity = *(it->second);
				//sEntity.setName(config.data());
			} else {
				LOG(warning) << "Template " << _entityName << "\"" << def.get().data() << "\" not found! Using standard values.";
			}
		}
		sensorEntity(sEntity, config);
		return true;
	}

	bool readGlobal(boost::property_tree::iptree& config) {
		boost::optional<boost::property_tree::iptree&> globalVals = config.get_child_optional("global");
		if (globalVals) {
			BOOST_FOREACH(boost::property_tree::iptree::value_type &global, config.get_child("global")) {
				if (boost::iequals(global.first, "mqttprefix")) {
					_mqttPrefix = global.second.data();
					if (_mqttPrefix[_mqttPrefix.length()-1] != '/') {
						_mqttPrefix.append("/");
					}
					LOG(debug) << "  Using own MQTT-Prefix " << _mqttPrefix;
				} else if (boost::iequals(global.first, "cacheInterval")) {
					_cacheInterval = stoul(global.second.data());
					LOG(debug) << "  Using own caching interval " << _cacheInterval << " [s]";
					_cacheInterval *= 1000;
				}
			}
		}
		global(config);
		return true;
	}

	/**
	 * Virtual interface method, responsible for setting global values specifically
	 * for its plugin.
	 *
	 * @param pluginSettings	The struct with global default plugin settings
	 */
	virtual void derivedSetGlobalSettings(const pluginSettings_t& pluginSettings) {
		//Overwrite if necessary
	}

	/**
	 * Pure virtual interface method, responsible for reading plugin-specific sensor
	 * base values.
	 *
	 * @param sBase		The sensor base for which to set the values
	 * @param config	A boost property (sub-)tree containing the sensor values
	 */
	virtual void sensorBase(SBase& s, boost::property_tree::iptree& config) = 0;

	/**
	 * Pure virtual interface method, responsible for reading plugin-specific sensor
	 * group values.
	 *
	 * @param sGroup	The sensor group for which to set the values
	 * @param config	A boost property (sub-)tree containing the group values
	 */
	virtual void sensorGroup(SGroup& s, boost::property_tree::iptree& config) = 0;

	/**
	 * Virtual interface method, responsible for reading plugin-specific sensor
	 * entity values.
	 *
	 * @param sEntity	The sensor entity for which to set the values
	 * @param config	A boost property (sub-)tree containing the entity values
	 */
	virtual void sensorEntity(SEntity& s, boost::property_tree::iptree& config) {
		//Overwrite if necessary
		LOG(warning) << "Method sensorEntity called, but was not overwritten! Either you have unwanted entitys in your config file or forgot to overwrite this method";
	}

	/**
	 * Virtual interface method, responsible for reading plugin-specific global values.
	 *
	 * @param config	A boost property (sub-)tree containing the global values
	 */
	virtual void global(boost::property_tree::iptree& config) {}

	std::string		_entityName;
	std::string		_groupName;
	std::string		_baseName;

	std::string 	_cfgPath;
	std::string		_mqttPrefix;
	unsigned int	_cacheInterval;
	std::vector<SensorGroupInterface*> _sensorGroups;
	std::vector<SEntity*> _sensorEntitys;
	sGroupMap_t		_templateSensorGroups;
	sEntityMap_t	_templateSensorEntitys;
};

#endif /* SRC_CONFIGURATORTEMPLATE_H_ */