/* 
 * Linux VeeJay
 *
 * Copyright(C)2002 Niels Elburg <nwelburg@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License , or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 , USA.
 */

#include <libvje/effects/common.h>
#include <veejaycore/vjmem.h>
#include "transline.h"

vj_effect *transline_init(int width, int height)
{
    vj_effect *ve = (vj_effect *) vj_calloc(sizeof(vj_effect));
    ve->num_params = 2;
    ve->defaults = (int *) vj_calloc(sizeof(int) * ve->num_params);	/* default values */
    ve->limits[0] = (int *) vj_calloc(sizeof(int) * ve->num_params);	/* min */
    ve->limits[1] = (int *) vj_calloc(sizeof(int) * ve->num_params);	/* max */
    ve->defaults[0] = 1;
    ve->defaults[1] = 1;
    
    ve->limits[0][0] = 0;
    ve->limits[1][0] = (width > height ? width : height);

    ve->limits[0][1] = 0;
    ve->limits[1][1] = 1;
    
    ve->sub_format = 1;
    ve->description = "Transition Wipe Cross";
    ve->extra_frame = 1;
	ve->has_user = 0;
	ve->param_description = vje_build_param_list(ve->num_params, "Speed", "Bounce");
    return ve;
}

typedef struct {
	float wipePositionX;
	float wipePositionY;
	int directionX;
	int directionY;
} wipe_t;

void *transline_malloc(int w, int h)
{
	wipe_t *wipe = (wipe_t*) vj_calloc(sizeof(wipe_t));
	wipe->directionX = 1;
	wipe->directionY = 1;
	return wipe;
}

void transline_free(void *ptr) {
	free(ptr);
}

void transline_apply( void *ptr, VJFrame *frame, VJFrame *frame2, int *args ) {
    wipe_t *wipe = (wipe_t *)ptr;
    int width = frame->width;
    int height = frame->height;
    int speed = args[0];
    int bounce = args[1];

    int centerX = width / 2;
    int centerY = height / 2;

	double scale = 1.0 * wipe->wipePositionX / width;
	const int crossWidth = width * scale;
	const int crossHeight = height * scale;

 	wipe->wipePositionX += speed * wipe->directionX;

    // Check if the wipe reaches the edge or goes negative
    if (wipe->wipePositionX >= width || wipe->wipePositionX <= 0) {
        if (bounce) {
            wipe->directionX *= -1;
        }
        wipe->wipePositionX = (wipe->directionX > 0) ? 0 : centerX;
    }

    for (int i = 0; i < height; ++i) {
        for (int j = 0; j < width; ++j) {
            int index = i * width + j;

            // Check if the pixel is inside the cross shape
            if ((j >= centerX - crossWidth / 2 && j <= centerX + crossWidth / 2) ||
                (i >= centerY - crossHeight / 2 && i <= centerY + crossHeight / 2)) {
                // Copy the pixel from the second frame
                frame->data[0][index] = frame2->data[0][index];
                frame->data[1][index] = frame2->data[1][index];
                frame->data[2][index] = frame2->data[2][index];
            }
        }
    }

}