package search;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.List;

/**
 * Compares two search recordings.
 * 
 * @author Franck van Breugel
 */
public class CompareSearchRecordings {
	/**
	 * Compares two search recordings.
	 * 
	 * @param args[0] name of the file containing the first serialized search recording
	 * @param args[1] name of the file containing the second serialized search recording
	 */
	public static void main(String[] args) {
		if (args.length != 2) {
			System.out.println("Use: java Generate <file name> <file name>");
		} else {
			try {
				FileInputStream file = new FileInputStream(args[0]);
				ObjectInputStream stream = new ObjectInputStream(file);
				List<String> first = (List<String>) stream.readObject();

				file = new FileInputStream(args[1]);
				stream = new ObjectInputStream(file);
				List<String> second = (List<String>) stream.readObject();
				stream.close();

				if (!first.equals(second)) {
					// ensure first.size() >= second.size()
					if (first.size() < second.size()) {
						List<String> temp = first;
						first = second;
						second = temp;
					}

					// find the index where they differ
					int index = 0;
					while (index < second.size() && first.get(index).equals(second.get(index))) {
						index++;
					}

					// print both lists in parallel and indicate where they differ first
					for (int i = 0; i < index; i++) {
						System.out.printf("%s     %s%n", get(first, i), get(second, i));
					}

					System.out.printf("%s <=> %s%n", get(first, index), get(second, index));

					for (int i = index + 1; i < first.size(); i++) {
						System.out.printf("%s     %s%n", get(first, i), get(second, i));
					}
				}
			} catch (IOException | ClassNotFoundException e) {
				System.out.println("Something went wrong with the file");
			}
		}
	}

	/**
	 * Returns the element with the given index of the given list 
	 * padded with spaces so that result is 25 characters if the
	 * element exists.  Otherwise, 25 spaces.
	 *
	 * @param list a list
	 * @param index an index
	 * @return the element with the given index of the given list, padded with spaces
	 */
	private static String get(List<String> list, int index) {
		final int LENGTH = 25;
		String result;
		if (index < list.size()) {
			result = list.get(index);
		} else {
			result = "";
		}
		while (result.length() < LENGTH) {
			result += " ";
		}
		return result;
	}
}