package hw7;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;

/**
 * @author Khalil Fleming
 *
 * ParseCampusModel
 * CampusPathModelParse will handle the parsing in of the csv files given to the MVC
 * by the controller and will store the information inside multiple data structures to be
 * used later to store the information in the graph.
 *
 */
public class CampusPathModelParse {


    /**
     * readEdge will store the edge csv file inside a multitude of data structures for
     * future use to create a graph.
     * @param filename - the file which is to be read in
     * @param idToId - an ArrayList of ArrayLists that stores id1 as the first element, and id2 as the second element
     * @effects adds to hash map idToId in the form of <id, id>
     * @throws IOException - if the file is the incorrect format or cannot be read
     */
    public static void readEdge(String filename, ArrayList<ArrayList<String>> idToId)
                                throws IOException{
        @SuppressWarnings("resource")
        BufferedReader reader = new BufferedReader(new FileReader(filename));
        String line = null;

        while ((line = reader.readLine()) != null) {
            String[] temp = line.split(",");
            if(temp.length != 2) {
                throw new IOException("Incorrect Edge file format");
            }
            String id1 = temp[0];
            String id2 = temp[1];
            ArrayList<String> tempArrayList = new ArrayList<>();
            tempArrayList.add(id1);
            tempArrayList.add(id2);
            idToId.add(tempArrayList);

        }

        reader.close();

    }

    /**
     * readNode will store the node csv file inside a multitude of data structures for
     * future use to create a graph.
     *
     * @param filename - the file to be read in
     * @param nameToId - a hash map which will store names as keys and id's as values
     * @param idToName - a hash map which will store id's as keys and names as values
     * @param idToX - a hash map which will store id's as keys and the x position as values
     * @param idToY - a hash map which will store id's as keys and the y position as values
     * @effects adds to hash map nameToId with the structure <name, id>
     *          adds to hash map idToName with the structure <id, name>
     *          adds to hash map idToX with the structure <id, x>
     *          adds to hash map idToY with the structure <id, y>
     * @throws IOException if the file is not in the correct format, or can not be read in.
     */
    public static void readNode(String filename, HashMap<String, String> nameToId,
                                HashMap<String, String> idToName, HashMap<String, Integer> idToX,
                                HashMap<String, Integer> idToY) throws IOException {

        @SuppressWarnings("resource")
        BufferedReader reader = new BufferedReader(new FileReader(filename));
        String line = null;

        while ((line = reader.readLine()) != null) {
             String[] temp = line.split(",");
             if(temp.length != 4) {
                 throw new IOException("Incorrect Node file Format");
             }
             String buildingName = temp[0];
             String buildingID = temp[1];
             if(buildingName.equals("")) {
                 buildingName = "Intersection " + buildingID;
             }
             Integer xCoordinate = Integer.parseInt(temp[2]);
             Integer yCoordinate = Integer.parseInt(temp[3]);
             nameToId.put(buildingName, buildingID);
             idToName.put(buildingID, buildingName);
             idToX.put(buildingID, xCoordinate);
             idToY.put(buildingID, yCoordinate);
        }
        reader.close();

    }
}