albumclass_assignment05

package assignment05;

public class PhotoAlbum {

    //String to int: Integer.parseInt(myString);
    //int to string: String.valueOf(i)

    private String[] photos;
    private int nextOpenIndex;
    private String curPhoto;

    PhotoAlbum(int size) {
        this.photos = new String[size];
    }

    //initialize photos with already existing album
    PhotoAlbum(String[] givenPhotos) {
        setPhotos(givenPhotos);
    }

    //prints curPhoto, if no photo selected then prints "no photo selected"
    public void viewPhoto() {
        System.out.println(this.curPhoto != null ? this.curPhoto : "No photo selected.");
    }

    //clears curPhoto
    public void stop() {
        if (this.curPhoto != null) {
            this.curPhoto = null;
            System.out.println("Viewer cleared.");
        } else {
            System.out.println("No photo selected.");
        }
    }

    //returns index if photo exists, returns -1 if not found
    public int photoExists(String photoName) {
        for (int i = 0; i < this.nextOpenIndex; i++) {
            if (photoName.equals(this.photos[i])) {
                return i;
            }
        }
        return -1;
    }

    //returns curPhoto, else returns "No photo selected"
    public String getCurrentPhoto() {
        return this.curPhoto != null ? this.curPhoto : "No photo selected.";
    }

    //return true, sets curPhoto to photoName. Else returns false
    public boolean setCurrentPhoto(String photoName) {
        if (this.photoExists(photoName) > -1) {
            this.curPhoto = photoName;
            return true;
        } else {
            return false;
        }
    }

    //if photos isn't full and photo doesn't already exist, add to photos, increment nextOpenIndex, return true. Else return false
    public boolean addPhoto(String photoName) {
        if (this.nextOpenIndex < this.photos.length && this.photoExists(photoName) == -1) {
            this.photos[this.nextOpenIndex] = photoName;
            this.nextOpenIndex++;
            return true;
        } else {
            return false;
        }
    }

    //if exists, remove photo from this.photos, shifts remaining photos to fill gap, decrements nextOpenIndex.
    //Returns name of photo that was removed, else returns null
    public String removePhoto(String photoName) {
        int index = this.photoExists(photoName);

        if (index != -1) { // if photo exists

            //shift all photos down one and clear the copy of last picture
            for (int i = index; i < this.photos.length-1; i++) {
                this.photos[i] = this.photos[i+1];
            }
            this.nextOpenIndex--;
            this.photos[this.nextOpenIndex] = null;
            //update nextOpenIndex
            return photoName;

        } else {
            return null;
        }
    }

    //returns photos.length
    public int getMaxPhotoCapacity() {
        return this.photos.length;
    }

    //returns nextOpenIndex-1
    public int getCurNumPhotos() {
        return this.nextOpenIndex;
    }

    //returns if nextOpenIndex == photos.length
    public boolean isFull() {
        return this.nextOpenIndex == this.photos.length;
    }

    //returns empty space in photos[]
    public int spaceAvailable() {
        return this.photos.length - this.nextOpenIndex;
    }

    //print all photos
    public void listAllPhotos() {
        for(int i = 0; i < this.nextOpenIndex; i++) {
            System.out.println(this.photos[i]);
        }
    }

    //set this.photos to be twice givenPhotos. Add all givenPhtos elements to this.photos.
    //set nextOpenIndex to givenPhotos length
    public void setPhotos(String[] givenPhotos) {
        int givenPhotosLength = givenPhotos.length;

        this.photos = new String[givenPhotosLength*2];

        //copy photos from 'givenPhotos' to 'photos' array
        for (int i = 0; i < givenPhotosLength; i++) {
            this.photos[i] = givenPhotos[i];
        }
        this.nextOpenIndex = givenPhotosLength;
    }
}