/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
   Copyright (C) 2009 Red Hat, Inc.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>

#include "red-common.h"
#include "reds.h"
#include "red-channel-client.h"
#include "red-client.h"
#include "main-channel.h"
#include "main-channel-client.h"

XXX_CAST(RedChannelClient, MainChannelClient, MAIN_CHANNEL_CLIENT);

RedClient *MainChannel::get_client_by_link_id(uint32_t connection_id)
{
    RedChannelClient *rcc;

    FOREACH_CLIENT(this, rcc) {
        MainChannelClient *mcc = MAIN_CHANNEL_CLIENT(rcc);
        if (mcc->get_connection_id() == connection_id) {
            return rcc->get_client();
        }
    }
    return nullptr;
}

static void main_channel_push_channels(MainChannelClient *mcc)
{
    if (mcc->get_client()->during_migrate_at_target()) {
        red_channel_warning(mcc->get_channel(),
                            "warning: ignoring unexpected SPICE_MSGC_MAIN_ATTACH_CHANNELS"
                            "during migration");
        return;
    }
    mcc->pipe_add_type(RED_PIPE_ITEM_TYPE_MAIN_CHANNELS_LIST);
}

void MainChannel::push_mouse_mode(SpiceMouseMode current_mode,
                                  int is_client_mouse_allowed)
{
    pipes_add(main_mouse_mode_item_new(current_mode, is_client_mouse_allowed));
}

void MainChannel::push_agent_connected()
{
    RedChannelClient *rcc;
    FOREACH_CLIENT(this, rcc) {
        if (rcc->test_remote_cap(SPICE_MAIN_CAP_AGENT_CONNECTED_TOKENS)) {
            rcc->pipe_add_type(RED_PIPE_ITEM_TYPE_MAIN_AGENT_CONNECTED_TOKENS);
        } else {
            rcc->pipe_add_empty_msg(SPICE_MSG_MAIN_AGENT_CONNECTED);
        }
    }
}

void MainChannel::push_agent_disconnected()
{
    pipes_add_type(RED_PIPE_ITEM_TYPE_MAIN_AGENT_DISCONNECTED);
}

static void main_channel_push_migrate_data_item(MainChannel *main_chan)
{
    main_chan->pipes_add_type(RED_PIPE_ITEM_TYPE_MAIN_MIGRATE_DATA);
}

bool MainChannelClient::handle_migrate_data(uint32_t size, void *message)
{
    RedChannel *channel = get_channel();
    MainChannelClient *mcc = this;
    auto header = static_cast<SpiceMigrateDataHeader *>(message);

    /* not supported with multi-clients */
    spice_assert(channel->get_n_clients() == 1);

    if (size < sizeof(SpiceMigrateDataHeader) + sizeof(SpiceMigrateDataMain)) {
        red_channel_warning(channel, "bad message size %u", size);
        return FALSE;
    }
    if (!migration_protocol_validate_header(header,
                                            SPICE_MIGRATE_DATA_MAIN_MAGIC,
                                            SPICE_MIGRATE_DATA_MAIN_VERSION)) {
        spice_error("bad header");
        return FALSE;
    }
    return reds_handle_migrate_data(channel->get_server(), mcc,
                                    reinterpret_cast<SpiceMigrateDataMain *>(header + 1), size);
}

void MainChannel::push_multi_media_time(uint32_t time)
{
    pipes_add(main_multi_media_time_item_new(time));
}

static void main_channel_fill_mig_target(MainChannel *main_channel, RedsMigSpice *mig_target)
{
    spice_assert(mig_target);
    g_free(main_channel->mig_target.host);
    main_channel->mig_target.host = g_strdup(mig_target->host);
    g_free(main_channel->mig_target.cert_subject);
    if (mig_target->cert_subject) {
        main_channel->mig_target.cert_subject = g_strdup(mig_target->cert_subject);
    } else {
        main_channel->mig_target.cert_subject = nullptr;
    }
    main_channel->mig_target.port = mig_target->port;
    main_channel->mig_target.sport = mig_target->sport;
}

void
MainChannel::registered_new_channel(RedChannel *channel)
{
    pipes_add(registered_channel_item_new(channel));
}

void MainChannel::migrate_switch(RedsMigSpice *new_mig_target)
{
    main_channel_fill_mig_target(this, new_mig_target);
    pipes_add_type(RED_PIPE_ITEM_TYPE_MAIN_MIGRATE_SWITCH_HOST);
}

bool MainChannelClient::handle_message(uint16_t type, uint32_t size, void *message)
{
    RedChannel *channel = get_channel();
    RedsState *reds = channel->get_server();

    switch (type) {
    case SPICE_MSGC_MAIN_AGENT_START: {
        SpiceMsgcMainAgentStart *tokens;

        tokens = static_cast<SpiceMsgcMainAgentStart *>(message);
        reds_on_main_agent_start(reds, this, tokens->num_tokens);
        break;
    }
    case SPICE_MSGC_MAIN_AGENT_DATA:
        reds_on_main_agent_data(reds, this, message, size);
        break;
    case SPICE_MSGC_MAIN_AGENT_TOKEN: {
        SpiceMsgcMainAgentTokens *tokens;

        tokens = static_cast<SpiceMsgcMainAgentTokens *>(message);
        reds_on_main_agent_tokens(reds, this, tokens->num_tokens);
        break;
    }
    case SPICE_MSGC_MAIN_ATTACH_CHANNELS:
        main_channel_push_channels(this);
        break;
    case SPICE_MSGC_MAIN_MIGRATE_CONNECTED:
        this->handle_migrate_connected(TRUE, FALSE);
        break;
    case SPICE_MSGC_MAIN_MIGRATE_CONNECTED_SEAMLESS:
        this->handle_migrate_connected(TRUE, TRUE);
        break;
    case SPICE_MSGC_MAIN_MIGRATE_CONNECT_ERROR:
        this->handle_migrate_connected(FALSE, FALSE);
        break;
    case SPICE_MSGC_MAIN_MIGRATE_DST_DO_SEAMLESS:
        this->handle_migrate_dst_do_seamless(
            (static_cast<SpiceMsgcMainMigrateDstDoSeamless *>(message))->src_version);
        break;
    case SPICE_MSGC_MAIN_MIGRATE_END:
        this->handle_migrate_end();
        break;
    case SPICE_MSGC_MAIN_MOUSE_MODE_REQUEST:
        reds_on_main_mouse_mode_request(reds, message, size);
        break;
    case SPICE_MSGC_PONG:
        handle_pong(static_cast<SpiceMsgPing *>(message), size);
        break;
    default:
        return RedChannelClient::handle_message(type, size, message);
    }
    return TRUE;
}

void MainChannelClient::handle_migrate_flush_mark()
{
    MainChannel *channel = get_channel();
    spice_debug("trace");
    main_channel_push_migrate_data_item(channel);
}

MainChannelClient *main_channel_link(MainChannel *channel, RedClient *client,
                                     RedStream *stream, uint32_t connection_id, int migration,
                                     RedChannelCapabilities *caps)
{
    MainChannelClient *mcc;

    spice_assert(channel);

    // TODO - migration - I removed it from channel creation, now put it
    // into usage somewhere (not an issue until we return migration to it's
    // former glory)
    mcc = main_channel_client_create(channel, client, stream, connection_id, caps);
    return mcc;
}

red::shared_ptr<MainChannel> main_channel_new(RedsState *reds)
{
    return red::make_shared<MainChannel>(reds);
}

MainChannel::MainChannel(RedsState *reds):
    RedChannel(reds, SPICE_CHANNEL_MAIN, 0, RedChannel::MigrateAll)
{
    set_cap(SPICE_MAIN_CAP_SEMI_SEAMLESS_MIGRATE);
    set_cap(SPICE_MAIN_CAP_NAME_AND_UUID);
    set_cap(SPICE_MAIN_CAP_AGENT_CONNECTED_TOKENS);
    set_cap(SPICE_MAIN_CAP_SEAMLESS_MIGRATE);
}

static int main_channel_connect_semi_seamless(MainChannel *main_channel)
{
    RedChannelClient *rcc;

    FOREACH_CLIENT(main_channel, rcc) {
        MainChannelClient *mcc = MAIN_CHANNEL_CLIENT(rcc);
        if (mcc->connect_semi_seamless())
            main_channel->num_clients_mig_wait++;
    }
    return main_channel->num_clients_mig_wait;
}

static int main_channel_connect_seamless(MainChannel *main_channel)
{
    RedChannelClient *rcc;

    spice_assert(main_channel->get_n_clients() == 1);

    FOREACH_CLIENT(main_channel, rcc) {
        MainChannelClient *mcc = MAIN_CHANNEL_CLIENT(rcc);
        mcc->connect_seamless();
        main_channel->num_clients_mig_wait++;
    }
    return main_channel->num_clients_mig_wait;
}

int MainChannel::migrate_connect(RedsMigSpice *new_mig_target, int try_seamless)
{
    main_channel_fill_mig_target(this, new_mig_target);
    num_clients_mig_wait = 0;

    if (!is_connected()) {
        return 0;
    }

    if (!try_seamless) {
        return main_channel_connect_semi_seamless(this);
    }

    RedChannelClient *rcc;
    GList *clients = get_clients();

    /* just test the first one */
    rcc = static_cast<RedChannelClient *>(g_list_nth_data(clients, 0));

    if (!rcc->test_remote_cap(SPICE_MAIN_CAP_SEAMLESS_MIGRATE)) {
        return main_channel_connect_semi_seamless(this);
    }

    return main_channel_connect_seamless(this);
}

void MainChannel::migrate_cancel_wait()
{
    RedChannelClient *rcc;

    FOREACH_CLIENT(this, rcc) {
        MainChannelClient *mcc = MAIN_CHANNEL_CLIENT(rcc);
        mcc->migrate_cancel_wait();
    }
    num_clients_mig_wait = 0;
}

int MainChannel::migrate_src_complete(int success)
{
    int semi_seamless_count = 0;
    RedChannelClient *rcc;

    if (!get_clients()) {
        red_channel_warning(this, "no peer connected");
        return 0;
    }

    FOREACH_CLIENT(this, rcc) {
        MainChannelClient *mcc = MAIN_CHANNEL_CLIENT(rcc);
        if (mcc->migrate_src_complete(success))
            semi_seamless_count++;
   }
   return semi_seamless_count;
}

void MainChannel::on_migrate_connected(gboolean success, gboolean seamless)
{
        spice_assert(num_clients_mig_wait);
        spice_assert(!seamless || num_clients_mig_wait == 1);
        if (!--num_clients_mig_wait) {
            reds_on_main_migrate_connected(get_server(),
                                           seamless && success);
        }
}

const RedsMigSpice* MainChannel::get_migration_target()
{
    return &mig_target;
}