#include "registration_thread.hpp"

RegistrationThread::RegistrationThread(
    Connection * connection_,
    std::string password,
    std::string username,
    std::string realname,
    std::string nickname
)
    : connection_{connection_}
    , password_{password}
    , username_{username}
    , realname_{realname}
    , nickname_{nickname}
    , stage_{Stage::LsReply}
{}

auto RegistrationThread::priority() const -> priority_type
{
    return 2;
}

auto RegistrationThread::on_connect() -> Thread::callback_result
{
    write_irc(*connection_, "CAP", "LS", "302");
    write_irc(*connection_, "PASS", password_);
    write_irc(*connection_, "USER", username_, "*", "*", realname_);
    write_irc(*connection_, "NICK", nickname_);
    return {};
}

auto RegistrationThread::send_req() -> Thread::callback_result
{
    std::string request;
    char const* want[] = { "extended-join", "account-notify", "draft/chathistory", "batch", "soju.im/no-implicit-names", "chghost", "setname", "account-tag", "solanum.chat/oper", "solanum.chat/identify-msg", "solanum.chat/realhost", "server-time", "invite-notify", "extended-join" };
    for (auto cap : want)
    {
        if (caps.contains(cap))
        {
            request.append(cap);
            request.push_back(' ');
            outstanding.insert(cap);
        }
    }
    if (not outstanding.empty())
    {
        request.pop_back();
        write_irc(*connection_, "CAP", "REQ", request);
        stage_ = Stage::AckReply;
        return {ThreadOutcome::Continue, EventOutcome::Consume};
    }
    else
    {
        write_irc(*connection_, "CAP", "END");
        return {ThreadOutcome::Finish, EventOutcome::Consume};
    }
}

auto RegistrationThread::capack(IrcMsg const& msg) -> Thread::callback_result
{
    auto const n = msg.args.size();
    if ("CAP" == msg.command && n >= 2 && "*" == msg.args[0] && "ACK" == msg.args[1])
    {
        auto in = std::istringstream{std::string{msg.args[2]}};
        std::for_each(
            std::istream_iterator<std::string>{in},
            std::istream_iterator<std::string>{},
            [this](std::string x) {
                outstanding.erase(x);
            }
        );
        if (outstanding.empty())
        {
            write_irc(*connection_, "CAP", "END");
            return {ThreadOutcome::Finish, EventOutcome::Consume};
        }
        else
        {
            return {ThreadOutcome::Continue, EventOutcome::Consume};
        }
    }
    else
    {
        return {};
    }
}

auto RegistrationThread::capls(IrcMsg const& msg) -> Thread::callback_result
{
    auto const n = msg.args.size();
    if ("CAP" == msg.command && n >= 2 && "*" == msg.args[0] && "LS" == msg.args[1])
    {
        std::string_view const* kvs;
        bool last;

        if (3 == n)
        {
            kvs = &msg.args[2];
            last = true;
        }
        else if (4 == n && "*" == msg.args[2])
        {
            kvs = &msg.args[3];
            last = false;
        }
        else
        {
            return {};
        }

        auto in = std::istringstream{std::string{*kvs}};

        std::for_each(
            std::istream_iterator<std::string>{in},
            std::istream_iterator<std::string>{},
            [this](std::string x) {
                auto const eq = x.find('=');
                if (eq == x.npos)
                {
                    caps.emplace(x, std::string{});
                }
                else
                {
                    caps.emplace(std::string{x, 0, eq}, std::string{x, eq+1, x.npos});
                }
            }
        );

        if (last)
        {
            return send_req();
        }

        return {ThreadOutcome::Continue, EventOutcome::Consume};
    }
    else
    {
        return {};
    }

}

auto RegistrationThread::on_msg(IrcMsg const& msg) -> Thread::callback_result
{
    switch (stage_)
    {
        case Stage::LsReply: return capls(msg);
        case Stage::AckReply: return capack(msg);
        default: return {};
    }
}

auto RegistrationThread::on_event(Event const& event) -> Thread::callback_result
{
    if (auto const irc_event = dynamic_cast<IrcMsgEvent const*>(&event))
    {
        return on_msg(irc_event->irc);
    }
    if (auto const connect_event = dynamic_cast<ConnectEvent const*>(&event))
    {
        return on_connect();
    }
    return {};
}