// SPDX-FileCopyrightText: 2014 Citra Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#include "common/scm_rev.h"

#include <fstream>
#include <string>
#include <fmt/format.h>

#define GIT_REV "@GIT_REV@"
#define GIT_BRANCH "@GIT_BRANCH@"
#define GIT_DESC "@GIT_DESC@"
#define BUILD_NAME "@REPO_NAME@"
#define BUILD_DATE "@BUILD_DATE@"
#define BUILD_FULLNAME "@BUILD_FULLNAME@"
#define BUILD_VERSION "@BUILD_VERSION@"
#define BUILD_ID "@BUILD_ID@"
#define TITLE_BAR_FORMAT_IDLE "@TITLE_BAR_FORMAT_IDLE@"
#define TITLE_BAR_FORMAT_RUNNING "@TITLE_BAR_FORMAT_RUNNING@"

namespace Common {

const char* g_scm_rev;
const char* g_scm_branch;
const char* g_scm_desc;
const char g_build_name[] = BUILD_NAME;
const char g_build_date[] = BUILD_DATE;
const char g_build_fullname[] = BUILD_FULLNAME;
const char g_build_version[] = BUILD_VERSION;
const char g_build_id[] = BUILD_ID;
const char g_title_bar_format_idle[] = TITLE_BAR_FORMAT_IDLE;
const char g_title_bar_format_running[] = TITLE_BAR_FORMAT_RUNNING;

/// Anonymizes SCM data
/// This is quite weak. But better than nothing.
class scm_encrypt {
    std::string m_scm_rev, m_scm_branch, m_scm_desc;

public:
    scm_encrypt() {
        // Get a key that is easy to obtain when asking the person directly but (usually) hard to
        // guess
        std::string key;
#ifdef __linux__
        if (!std::getline(std::ifstream("/proc/sys/kernel/hostname"), key))
            key = "linux_error_key";
#else
        // Not a good fallback, but better than nothing I guess?
        key = g_build_date;
#endif
        // Copy strings in place
        m_scm_rev = GIT_REV;
        m_scm_branch = GIT_BRANCH;
        m_scm_desc = GIT_DESC;
        // XOR each string with key
        auto key_it = key.begin();
        for (auto& string : {&m_scm_rev, &m_scm_branch, &m_scm_desc}) {
            for (auto& c : *string) {
                c ^= *key_it;
                if (++key_it == key.end())
                    key_it = key.begin();
            }
        }
        // Make each string human-readable
        for (auto& string : {&m_scm_rev, &m_scm_branch, &m_scm_desc}) {
            const std::string original = *string;
            string->clear();
            for (const auto c : original) {
                string->append(std::format("{:x}", unsigned(c)));
            }
            string->pop_back();
        }
        // Set pointers
        g_scm_rev = m_scm_rev.c_str();
        g_scm_branch = m_scm_branch.c_str();
        g_scm_desc = m_scm_desc.c_str();
    }
} scm_encrypt_instance;
} // namespace Common