/*
 * The Npic library and tools
 *
 * Copyright (C) 2003 Edouard Thiel <Edouard.Thiel@lif.univ-mrs.fr>
 *
 * This program is free software under the terms of the 
 * GNU Lesser General Public License (LGPL) version 2.1.
*/

/*
 * npic-conv.c - 13/11/2008
 *
*/

#include <npic.h>

void ShowUsage ()
{
    printf (
        "npic-conv - Convert image file in other file format from its extension.\n"
        "Usage:\n"
        "  npic-conv  -h | -help | --help       : print help\n"
        "  npic-conv  in1 out1 [-c|-l|-d]       : convert in1 to out1\n"
        "\n"
        "-c|-l|-d  : convert pixel type to char, long, double\n"
        "in1, out1 : image in " NPIC_KNOWN_IMAGE_EXT " format\n"
    );
}

void ArgcExit (int argc, int n)
{
    if (argc < n) {
        fprintf (stderr, "ERROR: %d argument(s) missing, "
                         "type \"npic-conv -h\" to get help.\n", n-argc);
        exit (1);
    }
}

int main (int argc, char *argv[])
{
    char *in1, *out1, *conv = "";
    Npic_image *np1;

    ArgcExit (argc, 2);
    
    if (strcmp (argv[1], "-h") == 0 || strcmp (argv[1], "-help") == 0 ||
        strcmp (argv[1], "--help") == 0) { ShowUsage (); exit (0); }
    
    ArgcExit (argc, 2+1);
    in1  = argv[1];
    out1 = argv[2];
    if (argc > 3) conv = argv[3];

    printf ("Loading \"%s\"\n", in1);
    np1 = NpicReadImage (in1);
    if (np1 == NULL) exit (1);
    
    if      (strcmp (conv, "-c") == 0) NpicConvertImage_c (np1);
    else if (strcmp (conv, "-l") == 0) NpicConvertImage_l (np1);
    else if (strcmp (conv, "-d") == 0) NpicConvertImage_d (np1);
    else if (strcmp (conv, "") != 0) {
        fprintf (stderr, "ERROR: argument \"%s\" unexpected\n", conv);
        exit (1);
    }

    printf ("Saving \"%s\"\n", out1);
    if (NpicWriteImage (np1, out1) != NPIC_SUCCESS) exit(1);
    
    NpicDestroyImage (np1);
    exit (0);
}