#include "config_utility.hpp"

#include <stdexcept>
#include <fstream>

using namespace std;

void ConfigUtility::Load(string fname) {
	ifstream is(fname);

	if (!is.is_open()) {
		throw(runtime_error("Failed to open config file"));
	}

	string key, val;

	for (;;) { //forever
		//eat whitespace
		while(isspace(is.peek()))
			is.ignore();

		//end of file
		if (is.eof())
			break;

		//skip comment lines
		if (is.peek() == '#') {
			while(is.peek() != '\n' && !is.eof()) {
				is.ignore();
			}
			continue;
		}

		//read in the pair
		getline(is, key,'=');
		getline(is, val);

		//trim the strings at the start & end
		while(key.size() && isspace(*key.begin())) key.erase(0, 1);
		while(val.size() && isspace(*val.begin())) val.erase(0, 1);

		while(key.size() && isspace(*(key.end()-1))) key.erase(key.end() - 1);
		while(val.size() && isspace(*(val.end()-1))) val.erase(val.end() - 1);

		//allow empty/wiped values
		if (key.size() == 0) {
			continue;
		}

		//save the pair
		table[key] = val;
	}

	is.close();
}