#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>

#include <cammy/camera.h>

#include "commands.h"

static struct {
    char *name;
    int (*fun)(int, char **);
} commands[] = {
    { "import", cammy_import },
    { "export", cammy_export },
    { "dither", cammy_dither },
    { "split",  cammy_split  },
    { "merge",  cammy_merge  },
    { NULL,           NULL   }
};

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

    if (message) {
        va_list args;

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

    for (i=0; commands[i].name; i++) {
        if (i == 0) {
            fprintf(stderr, "usage: %s %s ...\n", argv[0], commands[i].name);
        } else {
            fprintf(stderr, "       %s %s ...\n", argv[0], commands[i].name);
        }
    }

    exit(1);
}

void cammy_validate_photo_number(int argc, char **argv, int num) {
    if (num < 1 || num > CAMMY_CAMERA_PHOTO_COUNT) {
        usage(argc, argv, "Invalid photo number");
    }
}

int main(int argc, char **argv) {
    int i;

    if (argc < 2) {
        usage(argc, argv, "No command specified");
    }

    for (i=0; commands[i].name; i++) {
        if (strcmp(argv[1], commands[i].name) == 0) {
            return commands[i].fun(argc, argv);
        }
    }

    usage(argc, argv, "Unknown command '%s'", argv[1]);

    return 0;
}