#ifndef EVALCONFIG_H
#define EVALCONFIG_H

#include <iostream>
#include <string>
#include <fstream>
#include <unordered_map>
#include "IPINHelper.h"

#include <Indoor/Exception.h>

class EvalConfig {

private:

	std::unordered_map<std::string, std::string> keyVal;

public:

	EvalConfig() {
		;
	}

	/** get the value for the given key */
	const std::string& get(const std::string& key) {
		static std::string empty = "";
		auto it = keyVal.find(key);
		return (it == keyVal.end()) ? (empty) : (it->second);
	}

public:

	/** load the given configuration file */
	void load(const std::string& file) {


		std::ifstream inp(file);

		if (!inp.good()) {throw Exception("error while opening config file " + file);}


		std::string line;
		std::string tmp;
		while (!inp.eof()) {

			// read the next line (might be empty)
			std::getline(inp, tmp);
			if (tmp.empty()) {continue;}

			// in case of \r\n linebreaks, remove the remaining \r (might hereafter be empty)
			if (tmp.back() == '\r') {tmp.erase(tmp.end()-1);}
			if (tmp.empty()) {continue;}

			// multiline?
			bool multiline = false;
			if (tmp.back() == '\\') {multiline = true; tmp.erase(tmp.end()-1);}

			// attach
			line += tmp;

			// complete line? -> parse it
			if (!multiline) {parse(line); line = "";}

		}

		// trailing data
		parse(line);

		inp.close();

	}

private:

	/** parse one line */
	void parse(const std::string& line) {

		// check
		if (line.empty())			{return;}
		if (line.front() == '[')	{return;}

		// split key and value
		const size_t pos = line.find(" = ");
		if (pos == std::string::npos) {throw Exception("something wrong");}

		const std::string key = line.substr(0, pos);
		const std::string val = line.substr(pos+3);

		// add
		keyVal[key] = val;

	}

	/** get the eval config.ini filename */
	std::string getConfigFile() const {

		const std::string folder = IPINHelper::getDataFolder();
		const std::string file = folder + "it.cnr.isti.steplogger.config.ini";
		return file;

	}



};

#endif // EVALCONFIG_H