#include "registration_thread.hpp"

#include <memory>
#include <unordered_set>
#include <unordered_map>

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}
{
}

auto RegistrationThread::on_connect() -> void
{
    send_cap_ls(connection_);
    send_pass(connection_, password_);
    send_user(connection_, username_, realname_);
    send_nick(connection_, nickname_);

    connection_.remove_listener(connect_handle_);
}

auto RegistrationThread::send_req() -> void
{
    std::string request;
    char const* 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);
        }
    }
    
    connection_.remove_listener(message_handle_);
    
    if (not outstanding.empty())
    {
        request.pop_back();
        send_cap_req(connection_, request);
        
        listen_for_cap_ack();
    }
    else
    {
        send_cap_end(connection_);
    }
}

auto RegistrationThread::on_msg_cap_ack(IrcMsg const& msg) -> void
{
    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())
    {
        send_cap_end(connection_);
        connection_.remove_listener(message_handle_);
    }
}

auto RegistrationThread::on_msg_cap_ls(IrcMsg const& msg) -> void
{
    std::string_view const* kvs;
    bool last;

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

auto RegistrationThread::start(
    Connection& connection,
    std::string password,
    std::string username,
    std::string realname,
    std::string nickname
) -> std::shared_ptr<RegistrationThread>
{
    auto const thread = std::make_shared<RegistrationThread>(connection, password, username, realname, nickname);

    thread->listen_for_cap_ls();

    thread->connect_handle_ = connection.add_listener<ConnectEvent>([thread](ConnectEvent const&)
    {
        thread->on_connect();
    });

    return thread;
}

auto RegistrationThread::listen_for_cap_ack() -> void
{
    message_handle_ = connection_.add_listener<IrcMsgEvent>([thread = shared_from_this()](IrcMsgEvent const& event)
    {
        if (IrcCommand::CAP == event.command && event.irc.args.size() >= 2 && "*" == event.irc.args[0] && "ACK" == event.irc.args[1])
        {
            thread->on_msg_cap_ack(event.irc);
        }
    });
}

auto RegistrationThread::listen_for_cap_ls() -> void
{
    message_handle_ = connection_.add_listener<IrcMsgEvent>([thread = shared_from_this()](IrcMsgEvent const& event)
    {
        if (IrcCommand::CAP == event.command && event.irc.args.size() >= 2 && "*" == event.irc.args[0] && "LS" == event.irc.args[1])
        {
            thread->on_msg_cap_ls(event.irc);
        }
    });
}