/*******************************************************************************
 *   Ledger Ethereum App
 *   (c) 2016-2019 Ledger
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 ********************************************************************************/

#include <stdint.h>
#include <string.h>
#include <stdbool.h>

#include "asset_info.h"
#include "swap_utils.h"

bool parse_swap_config(const uint8_t *config,
                       uint8_t config_len,
                       char *ticker,
                       uint8_t *decimals,
                       uint64_t *chain_id) {
    uint8_t ticker_len, offset = 0;

    if (config_len == 0) {
        return false;
    }
    ticker_len = config[offset];
    offset += sizeof(ticker_len);
    if ((ticker_len == 0) || (ticker_len > (MAX_TICKER_LEN - 2)) ||
        ((config_len - offset) < (ticker_len))) {
        return false;
    }
    memcpy(ticker, config + offset, ticker_len);
    offset += ticker_len;
    ticker[ticker_len] = '\0';

    if ((config_len - offset) < 1) {
        return false;
    }
    *decimals = config[offset];
    offset += sizeof(*decimals);

    // the chain ID was adder later to the CAL swap subconfig
    // so it is optional for retro-compatibility (as it might not be present)
    if ((config_len - offset) >= sizeof(*chain_id)) {
        PRINTF("Chain ID from the swap subconfig = 0x%.*h\n", sizeof(*chain_id), &config[offset]);
        *chain_id = u64_from_BE(config + offset, sizeof(*chain_id));
    }
    return true;
}