package io.gitlab.jfronny.ImgJava.imageProcessing;

import io.gitlab.jfronny.ImgJava.util.Picture;

import java.awt.Color;

public class UtilGeometric {
    public enum MirrorMode {
        Vertical,
        Horizontal
    }

    public enum RotateMode {
        Left,
        Right
    }

    /**
     * Horizontally mirrors an image (mutates original instance)
     *
     * @param picture Picture to mirror
     * @return The mirrored image
     */
    public static Picture mirror(Picture picture, MirrorMode mirrorMode) {
        int w = picture.getWidth();
        int h = picture.getHeight();

        Color[][] pixel = picture.getPixelArray();
        Color[][] pixelNeu = new Color[w][h];

        for (int x = 0; x < w; x++) {
            for (int y = 0; y < h; y++) {
                pixelNeu[x][y] = switch (mirrorMode) {
                    case Vertical -> pixel[x][h - y - 1];
                    case Horizontal -> pixel[w - x - 1][y];
                };
            }
        }

        picture.setPixelArray(pixelNeu);
        return picture;
    }

    /**
     * Rotates an image by 90° (mutates original instance)
     *
     * @param picture Picture to mirror
     * @return The mirrored image
     */
    public static Picture rotate(Picture picture, RotateMode rotateMode) {
        int w = picture.getWidth();
        int h = picture.getHeight();

        Color[][] pixel = picture.getPixelArray();
        Color[][] pixelNeu = new Color[h][w];

        for (int x = 0; x < w; x++) {
            for (int y = 0; y < h; y++) {
                pixelNeu[y][x] = switch (rotateMode) {
                    case Left -> pixel[w - x - 1][y];
                    case Right -> pixel[x][h - y - 1];
                };
            }
        }

        picture.setPixelArray(pixelNeu);
        return picture;
    }
}