//
// Created by quentin on 8/4/22.
//


#include "data.h"

#include <utility>
#include <fstream>
#include <vector>
#include <rapidjson/stringbuffer.h>
#include <rapidjson/writer.h>


template<class T>
Data<T>::Data(std::string file) : fileName(std::move(file)) {
	// Create file if it doesnt exist
	std::ifstream chkExistIfs(getFilePath(), std::ios::in | std::ios::binary | std::ios::ate);
	if (chkExistIfs) {
		// File exists, were not creating one
		std::ifstream::pos_type fileSize = chkExistIfs.tellg();
		chkExistIfs.seekg(0, std::ios::beg);
		
		std::vector<char> bytes(fileSize);
		chkExistIfs.read(bytes.data(), fileSize);
		
		document.Parse(std::string(bytes.data(), fileSize).c_str());
		chkExistIfs.close();
	}
	else {
		// File doesnt exist we need to create one
		// This is the job of the derives constructor.
		chkExistIfs.close();
	};
}

template<class T>
std::string Data<T>::getFilePath() {
	return fileName;
}

template<class T>
void Data<T>::flushToFile() {
	rapidjson::StringBuffer buffer;
	rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
	document.Accept(writer);
	
	std::ofstream file(getFilePath());
	file << buffer.GetString();
	file.close();
}

template<class T>
Data<T>::~Data() {
	flushToFile();
}