/*
 *      cook - file construction tool
 *      Copyright (C) 1994, 1997-1999, 2001, 2006, 2007 Peter Miller;
 *      All rights reserved.
 *
 *      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, USA.
 *
 * MANIFEST: operating system start point, and command line argument parsing
 */

#include <common/ac/errno.h>
#include <common/ac/stdio.h>
#include <common/ac/stdlib.h>

#include <common/arglex.h>
#include <common/error_intl.h>
#include <common/fp/cksum.h>
#include <common/fp/cksum.h>
#include <common/fp/combined.h>
#include <common/fp/ident.h>
#include <common/fp/md5.h>
#include <common/fp/snefru.h>
#include <common/help.h>
#include <common/progname.h>
#include <common/version.h>
#include <common/str_list.h>


enum
{
    arglex_token_cksum,
    arglex_token_ident,
    arglex_token_md5,
    arglex_token_snefru
};

static arglex_table_ty argtab[] =
{
    { "-Checksum", arglex_token_cksum },
    { "-Identifier", arglex_token_ident },
    { "-Message_Digest", arglex_token_md5 },
    { "-Snefru", arglex_token_snefru },
    { 0, 0 }    /* end marker */
};


static void
usage(void)
{
    char            *progname;

    progname = progname_get();
    fprintf(stderr, "Usage: %s [ <option>... ][ <filename>... ]\n", progname);
    fprintf(stderr, "       %s -Help\n", progname);
    exit(1);
}


int
main(int argc, char **argv)
{
    string_ty       *minus;
    string_list_ty  file;
    size_t          j;
    fingerprint_methods_ty *method;
    string_ty       *s;

    arglex_init(argc, argv, argtab);
    str_initialize();
    switch (arglex())
    {
    case arglex_token_help:
        help((char *)0, usage);
        exit(0);

    case arglex_token_version:
        version();
        exit(0);

    default:
        break;
    }

    method = 0;
    string_list_constructor(&file);
    minus = str_from_c("-");
    while (arglex_token != arglex_token_eoln)
    {
        switch (arglex_token)
        {
        default:
            generic_argument(usage);
            continue;

        case arglex_token_snefru:
            if (method)
            {
                too_many_methods:
                error_intl(0, i18n("too many methods specified"));
                usage();
            }
            method = &fp_snefru;
            break;

        case arglex_token_ident:
            if (method)
                goto too_many_methods;
            method = &fp_ident;
            break;

        case arglex_token_md5:
            if (method)
                goto too_many_methods;
            method = &fp_md5;
            break;

        case arglex_token_cksum:
            if (method)
                goto too_many_methods;
            method = &fp_cksum;
            break;

        case arglex_token_string:
            s = str_from_c(arglex_value.alv_string);
            string_list_append(&file, s);
            str_free(s);
            break;

        case arglex_token_stdio:
            if (string_list_member(&file, minus))
            {
                error_intl(0, i18n("may only name standard input once"));
                usage();
            }
            string_list_append(&file, minus);
            break;
        }
        arglex();
    }

    /*
     * if no files named, read stdin
     */
    if (!file.nstrings)
        string_list_append(&file, minus);

    /*
     * by default, use the fp_combined class
     */
    if (!method)
        method = &fp_combined;

    /*
     * read the named files
     */
    for (j = 0; j < file.nstrings; ++j)
    {
        fingerprint_ty  *p;
        char            buf[1000];

        p = fingerprint_new(method);
        s = file.string[j];
        if (str_equal(s, minus))
        {
            if (fingerprint_file_sum(p, (char *)0, buf, sizeof(buf)))
            {
                int             err;
                string_ty       *s2;
                sub_context_ty  *scp;

                scp = sub_context_new();
                err = errno;
                s2 = subst_intl(scp, i18n("standard input"));
                /* re-use substitution context */
                sub_errno_setx(scp, err);
                sub_var_set_string(scp, "File_Name", s2);
                fatal_intl(scp, i18n("fingerprint $filename: $errno"));
                /* NOTREACHED */
                sub_context_delete(scp);
                str_free(s2);
            }
            printf("%s", buf);
            if (file.nstrings != 1)
                printf("\tstdin");
            printf("\n");
        }
        else
        {
            if (fingerprint_file_sum(p, s->str_text, buf, sizeof(buf)))
            {
                sub_context_ty  *scp;

                scp = sub_context_new();
                sub_errno_set(scp);
                sub_var_set_string(scp, "File_Name", s);
                fatal_intl(scp, i18n("fingerprint $filename: $errno"));
                /* NOTREACHED */
                sub_context_delete(scp);
            }
            printf("%s\t%s\n", buf, s->str_text);
        }
        fingerprint_delete(p);
    }
    exit(0);
    return 0;
}