// Copyright (c) 2012-2016 The Bitcoin Core developers
// Copyright (c) 2017-2020 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <clientversion.h>

#include <tinyformat.h>

#include <string>

/**
 * Name of client reported in the 'version' message. Report the same name
 * for both bitcoind and bitcoin-qt, to make it harder for attackers to
 * target servers or GUI users specifically.
 */
const std::string CLIENT_NAME("Bitcoin Cash Node");

/**
 * Client version number
 */
#define CLIENT_VERSION_SUFFIX ""

/**
 * The following part of the code determines the CLIENT_BUILD variable.
 * Several mechanisms are used for this:
 * * first, if HAVE_BUILD_INFO is defined, include build.h, a file that is
 *   generated by the build environment, possibly containing the output
 *   of git-describe in a macro called BUILD_DESC
 * * secondly, if this is an exported version of the code, GIT_ARCHIVE will
 *   be defined (automatically using the export-subst git attribute), and
 *   GIT_COMMIT will contain the commit id.
 * * then, three options exist for determining CLIENT_BUILD:
 *   * if BUILD_DESC is defined, use that literally (output of git-describe)
 *   * if not, but GIT_COMMIT is defined, use
 *     v[maj].[min].[rev].[build]-g[commit]
 *   * otherwise, use v[maj].[min].[rev].[build]-unk
 * finally CLIENT_VERSION_SUFFIX is added
 */

//! First, include build.h if requested
#ifdef HAVE_BUILD_INFO
#include <obj/build.h>
#endif

//! git will put "#define GIT_ARCHIVE 1" on the next line inside archives.
//! $Format:%n#define GIT_ARCHIVE 1$
#ifdef GIT_ARCHIVE
#define GIT_COMMIT_ID "$Format:%h$"
#define GIT_COMMIT_DATE "$Format:%cD$"
#endif

#define BUILD_DESC_WITH_SUFFIX(maj, min, rev, suffix)                          \
    "v" DO_STRINGIZE(maj) "." DO_STRINGIZE(min) "." DO_STRINGIZE(              \
        rev) "-" DO_STRINGIZE(suffix)

#define BUILD_DESC_FROM_COMMIT(maj, min, rev, commit)                          \
    "v" DO_STRINGIZE(maj) "." DO_STRINGIZE(min) "." DO_STRINGIZE(              \
        rev) "-g" commit

#define BUILD_DESC_FROM_UNKNOWN(maj, min, rev)                                 \
    "v" DO_STRINGIZE(maj) "." DO_STRINGIZE(min) "." DO_STRINGIZE(rev) "-unk"

#ifndef BUILD_DESC
#ifdef BUILD_SUFFIX
#define BUILD_DESC                                                             \
    BUILD_DESC_WITH_SUFFIX(CLIENT_VERSION_MAJOR, CLIENT_VERSION_MINOR,         \
                           CLIENT_VERSION_REVISION, BUILD_SUFFIX)

#elif defined(GIT_COMMIT_ID)
#define BUILD_DESC                                                             \
    BUILD_DESC_FROM_COMMIT(CLIENT_VERSION_MAJOR, CLIENT_VERSION_MINOR,         \
                           CLIENT_VERSION_REVISION, GIT_COMMIT_ID)

#else
#define BUILD_DESC                                                             \
    BUILD_DESC_FROM_UNKNOWN(CLIENT_VERSION_MAJOR, CLIENT_VERSION_MINOR,        \
                            CLIENT_VERSION_REVISION)
#endif
#endif

const std::string CLIENT_BUILD(BUILD_DESC CLIENT_VERSION_SUFFIX);

static std::string FormatVersion(int nVersion) {
    if (nVersion % 100 == 0) {
        return strprintf("%d.%d.%d", nVersion / 1000000,
                         (nVersion / 10000) % 100, (nVersion / 100) % 100);
    } else {
        return strprintf("%d.%d.%d.%d", nVersion / 1000000,
                         (nVersion / 10000) % 100, (nVersion / 100) % 100,
                         nVersion % 100);
    }
}

std::string FormatFullVersion() {
    return CLIENT_BUILD;
}

/**
 * Format the subversion field according to BIP 14 spec
 * (https://github.com/bitcoin/bips/blob/master/bip-0014.mediawiki)
 */
std::string FormatSubVersion(const std::string &name, int nClientVersion,
                             const std::vector<std::string> &comments) {
    std::ostringstream ss;
    ss << "/";
    ss << name << ":" << FormatVersion(nClientVersion);
    if (!comments.empty()) {
        std::vector<std::string>::const_iterator it(comments.begin());
        ss << "(" << *it;
        for (++it; it != comments.end(); ++it) {
            ss << "; " << *it;
        }
        ss << ")";
    }
    ss << "/";
    return ss.str();
}
