/*
 *   Copyright (c) 2014-2018, Andrew Romanenko <melanhit@gmail.com>
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright notice, this
 *      list of conditions and the following disclaimer.
 *   2. Redistributions in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *   3. Neither the name of the project nor the names of its contributors
 *      may be used to endorse or promote products derived from this software
 *      without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
 *   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *   DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 *   ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#include "../akmos.h"
#include "cli.h"

typedef enum {
    AKMOS_CLI_DIGEST,
    AKMOS_CLI_CIPHER_ENC,
    AKMOS_CLI_CIPHER_DEC,
    AKMOS_CLI_MAC,
    AKMOS_CLI_BASE64,
    AKMOS_CLI_HELP,
    AKMOS_CLI_UNKNOWN
} akmos_cli_id;

int amalloc(uint8_t **ptr, size_t len)
{
    *ptr = NULL;

    *ptr = malloc(len);
    if(*ptr == NULL) {
        fprintf(stderr, "%s\n", strerror(errno));
        return errno;
    }

    return EXIT_SUCCESS;
}

int akmos_cli_help() {
    printf("Usage: akmos <command> <options>\n"
           "Available commands:\n"
           " dgst   - make digest (hash)\n"
           " base64 - binary to text\n"
           " enc    - encrypt\n"
           " dec    - decrypt\n"
           " mac    - compute MAC\n"
           " help - print help\n");

    return EXIT_SUCCESS;
}

int akmos_cli_version()
{
    const char *buf;

    buf = akmos_version();
    printf("%s\n", buf);

    return EXIT_SUCCESS;
}

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

    if(argc < 2)
        return akmos_cli_help();

    if(strcmp(argv[1], "dgst") == 0)
        opt = AKMOS_CLI_DIGEST;
    else if(strcmp(argv[1], "enc") == 0)
        opt = AKMOS_CLI_CIPHER_ENC;
    else if(strcmp(argv[1], "dec") == 0)
        opt = AKMOS_CLI_CIPHER_DEC;
    else if(strcmp(argv[1], "mac") == 0)
        opt = AKMOS_CLI_MAC;
    else if(strcmp(argv[1], "base64") == 0)
        opt = AKMOS_CLI_BASE64;
    else if(strcmp(argv[1], "help") == 0)
        opt = AKMOS_CLI_HELP;
    else
        opt = AKMOS_CLI_UNKNOWN;

    switch(opt) {
        case AKMOS_CLI_DIGEST:
            return akmos_cli_digest(--argc, ++argv);

        case AKMOS_CLI_CIPHER_ENC:
            return akmos_cli_cipher(--argc, ++argv, AKMOS_MODE_ENCRYPT);

        case AKMOS_CLI_CIPHER_DEC:
            return akmos_cli_cipher(--argc, ++argv, AKMOS_MODE_DECRYPT);

        case AKMOS_CLI_MAC:
            return akmos_cli_mac(--argc, ++argv);

        case AKMOS_CLI_BASE64:
            return akmos_cli_base64(--argc, ++argv);

        case AKMOS_CLI_HELP:
            return akmos_cli_help();

        case AKMOS_CLI_UNKNOWN:
            fprintf(stderr, "Unknown action '%s'\n", argv[1]);
            return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}