#include "write_irc.hpp"

namespace {

auto write_irc(Connection& connection, std::string message) -> void
{
    connection.write_line(std::move(message));
}

auto is_invalid_last(char x) -> bool
{
    return x == '\0' || x == '\r' || x == '\n';
}

auto is_invalid(char x) -> bool
{
    return x == '\0' || x == '\r' || x == '\n' || x == ' ';
}

auto write_irc(Connection& connection, std::string front, std::string_view last) -> void
{
    if (last.end() != std::find_if(last.begin(), last.end(), is_invalid_last))
    {
        throw std::runtime_error{"bad irc argument"};
    }

    front += " :";
    front += last;
    write_irc(connection, std::move(front));
}

template <typename... Args>
auto write_irc(Connection& connection, std::string front, std::string_view next, Args ...rest) -> void
{
    if (next.empty()
    || next.front() == ':'
    || next.end() != std::find_if(next.begin(), next.end(), is_invalid))
    {
        throw std::runtime_error{"bad irc argument"};
    }

    front += " ";
    front += next;
    write_irc(connection, std::move(front), rest...);
}

} // namespace

auto send_ping(Connection& connection, std::string_view txt) -> void
{
    write_irc(connection, "PING", txt);
}

auto send_pong(Connection& connection, std::string_view txt) -> void
{
    write_irc(connection, "PONG", txt);
}

auto send_pass(Connection& connection, std::string_view password) -> void
{
    write_irc(connection, "PASS", password);
}

auto send_user(Connection& connection, std::string_view user, std::string_view real) -> void
{
    write_irc(connection, "USER", user, "*", "*", real);
}

auto send_nick(Connection& connection, std::string_view nick) -> void
{
    write_irc(connection, "NICK", nick);
}

auto send_cap_ls(Connection& connection) -> void
{
    write_irc(connection, "CAP", "LS", "302");
}

auto send_cap_end(Connection& connection) -> void
{
    write_irc(connection, "CAP", "END");
}

auto send_cap_req(Connection& connection, std::string_view caps) -> void
{
    write_irc(connection, "CAP", "REQ", caps);
}

auto send_privmsg(Connection& connection, std::string_view target, std::string_view message) -> void
{
    write_irc(connection, "PRIVMSG", target, message);
}

auto send_notice(Connection& connection, std::string_view target, std::string_view message) -> void
{
    write_irc(connection, "NOTICE", target, message);
}