import java.util.Arrays;
import java.util.Objects;

/**
 * Array based storage for Resumes
 */
public class ArrayStorage {
    private Resume[] storage = new Resume[10_000];

    private int size;

    public void clear() {
        Arrays.fill(storage, 0, size, null);
        size = 0;
    }

    public void update(Resume resume) {
        int index = getIndex(resume.getUuid());

        if (index >= 0) {
            storage[index] = resume;
        } else {
            System.out.println("ERROR in method 'update' :" + resume.getUuid());
        }
    }

    public void save(Resume resume) {
        int index = getIndex(resume.getUuid());

        if (index >= 0) {
            System.out.println("ERROR in method 'save' :" + resume.getUuid());
        } else {
            if (size < storage.length) {
                storage[size] = resume;
                size++;
            } else {
                System.out.println("ERROR in method 'save' :" + resume.getUuid() + " (storage backing array boundary has been reached)");
            }
        }
    }

    public Resume get(String uuid) {
        int index = getIndex(uuid);

        if (index >= 0) {
            return storage[index];
        } else {
            System.out.println("Invalid uuid in method 'get': " + uuid);
            return null;
        }
    }


    public void delete(String uuid) {
        int index = getIndex(uuid);

        if (index >= 0) {
            storage[index] = storage[size - 1];
            storage[size - 1] = null;
            size--;
        } else {
            System.out.println("Invalid uuid in method 'delete': " + uuid);
        }
    }

    /**
     * @return array, contains only Resumes in storage (without null)
     */
    public Resume[] getAll() {
        return Arrays.copyOf(storage, size);
    }

    public int size() {
        return size;
    }

    private int getIndex(String uuid) {
        for (int i = 0; i < size; i++) {
            if (Objects.equals(storage[i].getUuid(), uuid)) {
                return i;
            }
        }
        return -1;
    }
}