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

#include <cammy/photo.h>
#include <cammy/camera.h>

#include "commands.h"

static cammy_image_color palette[4] = {
    {   0,   0,   0, 0 },
    {  85,  85,  85, 0 },
    { 171, 171, 171, 0 },
    { 255, 255, 255, 0 }
};

static void usage(int argc, char **argv, const char *message, ...) {
    if (message) {
        va_list args;

        va_start(args, message);
        vfprintf(stderr, message, args);
        va_end(args);
         fprintf(stderr, "\n");
    }

    fprintf(stderr, "usage: %1$s export file.sav 1..30 output.png\n", argv[0]);

    exit(1);
}

int cammy_export(int argc, char **argv) {
    cammy_camera *camera;
    int photo = 0;
    cammy_image *image;

    if (argc < 3) {
        usage(argc, argv, "No save file provided");
    } else if (argc < 4) {
        usage(argc, argv, "No photo number provided");
    } else if (argc < 5) {
        usage(argc, argv, "No output filename provided");
    }

    photo = atoi(argv[3]);

    if (photo < 1 || photo > CAMMY_CAMERA_PHOTO_COUNT) {
        usage(argc, argv, "Invalid photo number");
    }

    if ((camera = cammy_camera_open(argv[2])) == NULL) {
        fprintf(stderr, "%s: %s: %s: %s\n",
            argv[0], "cammy_camera_open()", argv[2], strerror(errno));

        goto error_camera_open;
    }

    if ((image = cammy_photo_export(&camera->data->photos[photo-1],
                                    CAMMY_IMAGE_BITMAP,
                                    CAMMY_IMAGE_24BPP_RGB,
                                    palette)) == NULL) {
        goto error_photo_export;
    }

    if (cammy_image_save(image, argv[4]) < 0) {
        goto error_image_save;
    }

    cammy_image_destroy(image);

    cammy_camera_close(camera);

    return 0;

error_image_save:
    cammy_image_destroy(image);

error_photo_export:
    cammy_camera_close(camera);

error_camera_open:
    return 1;
}