#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

#include <cammy/image.h>

#include "png.h"
#include "commands.h"

int cammy_command_slice(int argc, char **argv) {
    uint8_t *buf;

    size_t width, height,
           x_pad, y_pad;

    int depth;

    if (argc < 3) {
        cammy_command_usage(argc, argv, "No X padding provided");
    } else if (argc < 4) {
        cammy_command_usage(argc, argv, "No Y padding provided");
    } else if (argc < 5) {
        cammy_command_usage(argc, argv, "No input PNG image provided");
    }

    x_pad = atoi(argv[2]);
    y_pad = atoi(argv[3]);

    if ((buf = cammy_png_load(argv[4], &width, &height, &depth)) == NULL) {
        goto error_read_png_file;
    }

    if (cammy_image_slice(buf, width, height, x_pad, y_pad, depth) < 0) {
        goto error_image_slice;
    }

    free(buf);

    return 0;

error_image_slice:
    free(buf);

error_read_png_file:
    return 1;
}