/* cli.c -- Code for providing a command-line interface.

   Copyright (C) 2017 Jakob Tsar-Fox, All Rights Reserved.

   This file is part of Nekopack.

   Nekopack 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 3 of the License, or (at
   your option) any later version.

   Nekopack 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 Nekopack. If not, see <http://www.gnu.org/licenses/>. */

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

#include <getopt.h>

#include "cli.h"
#include "crypto.h" /* New, maybe clean up the section on game crypto? */


/* Returns a params structure parsed from `argv`. */
struct params parse_args(int argc, char **argv) {
    struct params p = {0};
    
    if (argc < 2) {
        p.mode = USAGE;
        return p;
    }
    p.mode = EXTRACT;
    
    int cur = 0, opt_index = 0, count = 0;
    static struct option long_opts[] = {
        {"help", no_argument, NULL, 'h'},
        {"version", no_argument, NULL, 'v'},
        {"quiet", no_argument, NULL, 'q'},
        {"extract", no_argument, NULL, 'e'},
        {"list", no_argument, NULL, 'l'},
        {"output", no_argument, NULL, 'o'},
        {"game", no_argument, NULL, 'g'},
        {NULL, 0, NULL, 0}
    };

    do {
        count++;
        cur = getopt_long(argc, argv, "hvelqo:", long_opts, &opt_index);
        switch (cur) {
            case 'h':
                p.mode = HELP;
                return p;
            case 'v':
                p.mode = VERSION;
                return p;
            case 'q':
                p.quiet = true;
                break;
            case 'o':
                count++;
                p.out_len = strlen(optarg);
                p.out = malloc(p.out_len + 2);
                strcpy(p.out, optarg);
                if (p.out[p.out_len - 1] != '/')
                    p.out[p.out_len] = '/';
                break;
            case 'g':
                count++;
                if (!strcmp(optarg, "nekopara_volume_0"))
                    p.game = NEKOPARA_VOLUME_0;
                else if (!strcmp(optarg, "nekopara_volume_0_steam"))
                    p.game = NEKOPARA_VOLUME_0_STEAM;
                else if (!strcmp(optarg, "nekopara_volume_1"))
                    p.game = NEKOPARA_VOLUME_1;
                else if (!strcmp(optarg, "nekopara_volume_1_steam"))
                    p.game = NEKOPARA_VOLUME_1_STEAM;
            case 'e':
                p.mode = EXTRACT;
                break;
            case 'l':
                p.mode = LIST;
        }
    } while (cur >= 0);

    if (count == argc) {
        p.mode = USAGE;
        return p;
    }
    p.vararg_index = count;

    if (p.out == NULL) {
        p.out_len = 2;
        p.out = malloc(3);
        strcpy(p.out, "./");
    }

    return p;
}


/* Frees allocated memory associated with `p`. */
void params_free(struct params p) {
    free(p.out);
}