/*
    Array5.java
    CIS 160
    David Klick
    2004-11-01

    Linear searching of arrays. Using parallel arrays.
*/

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.StringTokenizer;

public class Array5 {
    public static void main(String[] args) throws IOException {
        BufferedReader in = new BufferedReader(new FileReader("people2.txt"));
        final int MAXSIZE = 100;
        int numRecs = 0;
        String[] names = new String[MAXSIZE];
        int[] ids = new int[MAXSIZE];

        String s;
        s = in.readLine();
        while (s != null) {
            if (numRecs < MAXSIZE) {
                names[numRecs] = processName(s);
                ids[numRecs] = processID(s);
                numRecs++;
            } else {
                System.out.println("Error: Too many records in file");
                break;
            }
            s = in.readLine();
        }
        in.close();

        for (int i=0; i<numRecs; i++) {
            System.out.printf("%3d: %s\n", ids[i], names[i]);
        }
        System.out.println(numRecs + " records");

        BufferedReader kbd = new BufferedReader(new InputStreamReader(System.in));
        int id = -1;
        do {
            // get employee ID from user (-1 to quit)
            System.out.print("Enter employee ID to find (-1 to exit): ");
            boolean valid = false;
            do {
                valid = false;
                try {
                    id = Integer.parseInt(kbd.readLine());
                    valid = true;
                } catch (NumberFormatException e) {
                    System.out.print("Invalid input. Try again: ");
                }
            } while (!valid);

            // do linear search for ID number through ids[]
            if (id != -1) {
                boolean found = false;
                int i = 0;
                while (i < numRecs && !found) {
                    if (ids[i] == id) {
                        System.out.println("Employee " + id + " found: " + names[i]);
                        found = true;
                    }
                    i++;
                }
                if (!found) System.out.println("Employee " + id + " not found");
            }
        } while (id != -1);
    }

    public static String processName(String s) {
        StringTokenizer tok = new StringTokenizer(s, ",");
        if (tok.countTokens() != 2) {
            System.out.println("Invalid number of fields in record");
            return "";
        }
        tok.nextToken();   // throw away first field
        StringBuffer sb = new StringBuffer(tok.nextToken());
        int ndx = sb.length() - 1;
        while (ndx >= 0) {
            if (sb.charAt(ndx) == '"') sb.deleteCharAt(ndx);
            ndx--;
        }
        return sb.toString().trim();
    }

    public static int processID(String s) {
        StringTokenizer tok = new StringTokenizer(s, ",");
        if (tok.countTokens() != 2) {
            System.out.println("Invalid number of fields in record");
            return -1;
        }
        return Integer.parseInt(tok.nextToken());
    }
}