// Crash and log helpers.

string log_format_timestamp() {
    datetime dt;
    string stamp = dt.format(DATE_TIME_FORMAT_RFC1123);
    return "[" + stamp + "]";
}

string log_flatten_multiline(const string& in text) {
    string result = "";
    bool lastWasSeparator = false;

    for (uint charIndex = 0; charIndex < text.length(); charIndex++) {
        string ch = text.substr(charIndex, 1);
        if (ch == "\r" || ch == "\n") {
            if (!lastWasSeparator) {
                result += " | ";
                lastWasSeparator = true;
            }
            continue;
        }

        result += ch;
        lastWasSeparator = false;
    }

    return result;
}

bool log_append_line(const string& in logPath, const string& in message) {
    file logFile;
    if (!logFile.open(logPath, "ab")) {
        return false;
    }

    // Keep log format as message then timestamp.
    logFile.write(message + " " + log_format_timestamp() + "\r\n");
    logFile.close();
    return true;
}

void log_unhandled_exception_to_file(const string& in logPath = "crash.log", const string& in context = "") {
    string info = get_exception_info();
    string filePath = get_exception_file();
    int line = get_exception_line();
    string func = get_exception_function();
    string stack = log_flatten_multiline(last_exception_call_stack);

    string message = "Unhandled exception";
    if (context != "")
        message += " (" + context + ")";
    if (info != "")
        message += ": " + info;
    if (filePath != "")
        message += " at " + filePath;
    if (line > 0)
        message += ":" + line;
    if (func != "")
        message += " in " + func;
    if (stack != "")
        message += " | stack: " + stack;

    log_append_line(logPath, message);
}