#include "Distances.h"

Distances::Distances(std::string basePath)
{
	std::string filePath = basePath + "/distances.csv";
	if (!std::filesystem::exists(filePath.c_str()))
		throw std::runtime_error("File doesn't exist");

	std::cout << "Reading file " << filePath << " for distances\n";

	std::ifstream file;
	file.open(filePath, std::ios::in);
	if (!file.is_open())
		throw std::runtime_error("Failed to open file");

	std::string line;
	while (getline(file, line)) {
		if (line.empty())
			continue;

		std::string element;
		std::istringstream stream(line);
		std::vector<float> row;
		while (getline(stream, element, ',')) {
			int val = stoi(element);
			row.push_back(val);
		}
		this->matrix.push_back(row);
	}

	file.close();
	if (this->matrix.size() == 0)
		throw std::runtime_error("File contained no data");
}

float Distances::getDistance(int x, int y)
{
	int xMax = this->matrix.size() - 1;
	int yMax = this->matrix[0].size() - 1;

	if (yMax == 0) 
		throw std::runtime_error("Distances not initialised properly");
	else if (x < 1 || x > xMax)
		throw std::domain_error("X coordiante must be between 1 and " + xMax);
	else if (y < 1 || y > yMax) 
		throw std::domain_error("Y coordinate must be between 1 and " + yMax);

	return this->matrix[x - 1][y - 1];
}

float Distances::getTravelTime(int x, int y)
{
	return this->getDistance(x, y) / 55 * 60;
}