#include "../include/Channel.hpp"
#include <odhtdb/Database.hpp>
#include <odhtdb/bin2hex.hpp>
#include <cstring>
#include <sibs/SafeSerializer.hpp>

using namespace std;

namespace dchat
{
    static Channel *currentChannel;
    
    Channel::Channel(const string &_name, const odhtdb::DatabaseNode &_databaseNodeInfo, User *_localUser, odhtdb::Database *_database) : 
        database(_database),
        databaseNodeInfo(_databaseNodeInfo),
        name(_name),
        messageBoard(this),
        localUser(_localUser ? _localUser : new OfflineUser("You"))
    {
        bridgeServices.push_back(new DiscordService());
        addUserLocally(localUser);
            
        //addLocalMessage(u8"[emoji](https://discordemoji.com/assets/emoji/PepeDab.gif) deaf [emoji](https://discordemoji.com/assets/emoji/COGGERS.gif)", &systemUser, 0, odhtdb::Hash());
        //addLocalMessage(u8"[emoji](https://discordemoji.com/assets/emoji/PepeDab.gif)[emoji](https://discordemoji.com/assets/emoji/COGGERS.gif)", &systemUser, 0, odhtdb::Hash());
        //addLocalMessage(u8"pepedab https://discordemoji.com/assets/emoji/PepeDab.gif coggers https://discordemoji.com/assets/emoji/COGGERS.gif check out this url http://www.grandtournation.com/6808/start-date-of-the-grand-tour-season-3-confirmed-mark-your-calendars/ owo", &systemUser, 0, odhtdb::Hash());
        //addLocalMessage(u8"ht clic", &systemUser, 0, odhtdb::Hash());

        auto binds = Chatbar::getBinds();
        vector<string> suggestionsStr;
        suggestionsStr.reserve(binds.size());
        for(auto &bind : binds)
        {
            string suggestion = bind.first;
            suggestion += " ";
            suggestion += bind.second;
            suggestionsStr.emplace_back(move(suggestion));
        }
        suggestions.show(suggestionsStr);
        
        if(database)
        {
            database->seed(databaseNodeInfo, odhtdb::DatabaseFetchOrder::NEWEST_FIRST);
            
            pingKey = odhtdb::DhtKey(*databaseNodeInfo.getRequestHash()).getPingKey();
            // TODO: Ban peers that spam this key (take in account that creator of packets can be forged)
            pingListener = database->receiveCustomMessage(pingKey, [this](const void *data, usize size)
            {
                sibs::SafeSerializer result;
                try
                {
                    sibs::SafeDeserializer deserializer((const u8*)data, size);
                    u8 userPublicKeyRaw[odhtdb::PUBLIC_KEY_NUM_BYTES];
                    deserializer.extract(userPublicKeyRaw, odhtdb::PUBLIC_KEY_NUM_BYTES);
                    odhtdb::Signature::PublicKey userPublicKey((const char*)userPublicKeyRaw, odhtdb::PUBLIC_KEY_NUM_BYTES);
                    auto user = getUserByPublicKey(userPublicKey);
                    if(!user)
                    {
                        // TODO: Ban peer if this happens too often
                        return result;
                    }
                    
                    string unsignedData = userPublicKey.unsign(odhtdb::DataView((void*)deserializer.getBuffer(), deserializer.getSize()));
                    sibs::SafeDeserializer unsignedDeserializer((const u8*)unsignedData.data(), unsignedData.size());
                    u32 pingTimestampSec = unsignedDeserializer.extract<u32>();
                    if(pingTimestampSec > user->pingTimestampSec)
                    {
                        user->pingTimestampSec = pingTimestampSec;
                    }
                }
                catch(std::exception &e)
                {
                    fprintf(stderr, "Failed while deseralizing ping\n");
                }
                return result;
            });
            
            sendPing(database->getSyncedTimestampUtc().seconds);
        }
    }
    
    Channel::~Channel()
    {
        for(BridgeService *bridgeService : bridgeServices)
        {
            delete bridgeService;
        }

        if(database)
        {
            database->cancelNodeListener(pingListener);
            database->stopSeeding(*databaseNodeInfo.getRequestHash());
            sendPing(0);
        }
        
        for(User *user : users)
        {
            delete user;
        }

        for(auto &discordUserIt : discordUserById)
        {
            delete discordUserIt.second;
        }
    }
    
    User* Channel::getLocalUser()
    {
        return localUser;
    }
    
    SystemUser* Channel::getSystemUser()
    {
        return &systemUser;
    }
    
    MessageBoard& Channel::getMessageBoard()
    {
        return messageBoard;
    }
    
    const string& Channel::getName() const
    {
        return name;
    }
    
    const vector<User*>& Channel::getUsers() const
    {
        return users;
    }
    
    OnlineUser* Channel::getUserByPublicKey(const odhtdb::Signature::PublicKey &publicKey)
    {
        auto userIt = publicKeyOnlineUsersMap.find(publicKey);
        if(userIt != publicKeyOnlineUsersMap.end())
            return userIt->second;
        return nullptr;
    }
    
    const odhtdb::DatabaseNode& Channel::getNodeInfo() const
    {
        return databaseNodeInfo;
    }
    
    Message* Channel::getLatestMessage()
    {
        return messageBoard.getLatestMessage();
    }
    
    void Channel::addLocalMessage(const string &msg, User *owner, u64 timestampSeconds)
    {
        addLocalMessage(msg, owner, timestampSeconds, odhtdb::Hash());
    }
    
    void Channel::addLocalMessage(const string &msg, User *owner, u64 timestampSeconds, const odhtdb::Hash &id)
    {
        assert(owner);
        if(timestampSeconds == 0)
        {
            timestampSeconds = time(NULL);
        }
        messageBoard.addMessage(new Message(owner, msg, timestampSeconds), id);
    }

    void Channel::addLocalDiscordMessage(const string &discordUserName, u64 discordUserId, const string &msg, User *owner, u64 timestampSeconds, const odhtdb::Hash &id)
    {
        assert(owner);
        if(timestampSeconds == 0)
        {
            timestampSeconds = time(NULL);
        }

        OnlineDiscordUser *discordUser = nullptr;
        auto discordUserIt = discordUserById.find(discordUserId);
        if(discordUserIt == discordUserById.end())
        {
            discordUser = new OnlineDiscordUser(discordUserName, discordUserId, owner);
            discordUserById[discordUserId] = discordUser;
        }
        else
        {
            // TODO: What if several users bridge same chat? the same discord user id could belong to different owners.
            // Dchat channels should only allow one user to bridge data from one discord channel. Bridging data between multiple discord channels to
            // one dchat channel should be allowed.
            discordUser = discordUserIt->second;
        }
        messageBoard.addMessage(new Message(discordUser, msg, timestampSeconds), id);
    }
    
    void Channel::addSystemMessage(const string &msg, bool plainText)
    {
        u64 timestampSeconds = time(NULL);
        messageBoard.addMessage(new Message(&systemUser, msg, timestampSeconds, plainText), odhtdb::Hash());
    }
    
    void Channel::addMessage(const string &msg)
    {
        if(database && localUser->type == User::Type::ONLINE_LOCAL_USER)
        {
            auto onlineLocalUser = static_cast<OnlineLocalUser*>(localUser);
            
            sibs::SafeSerializer serializer;
            serializer.add(ChannelDataType::ADD_MESSAGE);
            serializer.add((const u8*)msg.data(), msg.size());
            
            database->addData(databaseNodeInfo, onlineLocalUser->keyPair, odhtdb::DataView(serializer.getBuffer().data(), serializer.getBuffer().size()));
        }
        else
            addLocalMessage(msg, localUser, 0, odhtdb::Hash());
    }

    void Channel::addDiscordMessage(const string &discordUserName, u64 discordUserId, const string &msg)
    {
        assert(database && localUser->type == User::Type::ONLINE_LOCAL_USER);
        auto onlineLocalUser = static_cast<OnlineLocalUser*>(localUser);
        
        sibs::SafeSerializer serializer;
        serializer.add(ChannelDataType::ADD_DISCORD_MESSAGE);
        serializer.add(discordUserId);
        serializer.add((u8)discordUserName.size());
        serializer.add((const u8*)discordUserName.data(), discordUserName.size());
        serializer.add((const u8*)msg.data(), msg.size());
        
        database->addData(databaseNodeInfo, onlineLocalUser->keyPair, odhtdb::DataView(serializer.getBuffer().data(), serializer.getBuffer().size()));
    }
    
    void Channel::deleteLocalMessage(const odhtdb::Hash &id, const odhtdb::Signature::PublicKey &requestedByUser)
    {
        messageBoard.deleteMessage(id, requestedByUser);
    }
    
    void Channel::deleteMessage(const odhtdb::Hash &id, const odhtdb::Signature::PublicKey &requestedByUser)
    {
        if(database && localUser->type == User::Type::ONLINE_LOCAL_USER)
        {
            auto onlineLocalUser = static_cast<OnlineLocalUser*>(localUser);
            
            sibs::SafeSerializer serializer;
            serializer.add(ChannelDataType::DELETE_MESSAGE);
            serializer.add((const u8*)id.getData(), odhtdb::HASH_BYTE_SIZE);
            
            database->addData(databaseNodeInfo, onlineLocalUser->keyPair, odhtdb::DataView(serializer.getBuffer().data(), serializer.getBuffer().size()));
        }
        else
            deleteLocalMessage(id, requestedByUser);
    }
    
    void Channel::addUserLocally(User *user)
    {
        users.push_back(user);
        user->avatarUrl = "https://discordemoji.com/assets/emoji/HanekawaSmug.gif";
        if(user->isOnlineUser())
        {
            auto onlineUser = static_cast<OnlineUser*>(user);
            publicKeyOnlineUsersMap[onlineUser->getPublicKey()] = onlineUser;
        }
    }
    
    bool Channel::addUser(const odhtdb::Signature::PublicKey &userId, const odhtdb::DataView &groupId)
    {
        assert(database);
        if(!database || localUser->type != User::Type::ONLINE_LOCAL_USER)
            return false;
        
        if(groupId.size != odhtdb::GROUP_ID_LENGTH)
        {
            fprintf(stderr, "Group id is wrong size. Expected to be %u bytes, was %u byte(s)\n", odhtdb::GROUP_ID_LENGTH, groupId.size);
            return false;
        }
        
        auto onlineLocalUser = static_cast<OnlineLocalUser*>(localUser);
        try
        {
            database->addUser(databaseNodeInfo, onlineLocalUser->keyPair, userId, groupId);
            return true;
        }
        catch(std::exception &e)
        {
            fprintf(stderr, "Group with id %s does not exist in channel %s or you do not have permission to add user to that group\nError: %s\n", odhtdb::bin2hex((const char*)groupId.data, groupId.size).c_str(), databaseNodeInfo.getRequestHash()->toString().c_str(), e.what());
            return false;
        }
    }
    
    void Channel::replaceLocalUser(OnlineLocalUser *newOnlineLocalUser)
    {
        for(vector<User*>::iterator it = users.begin(); it != users.end(); ++it)
        {
            if(*it == localUser)
            {
                users.erase(it);
                delete localUser;
                break;
            }
        }
        
        localUser = newOnlineLocalUser;
        addUserLocally(newOnlineLocalUser);
    }
    
    void Channel::changeNick(const string &newNick)
    {
        if(database && localUser->type == User::Type::ONLINE_LOCAL_USER)
        {
            auto onlineLocalUser = static_cast<OnlineLocalUser*>(localUser);
            
            sibs::SafeSerializer serializer;
            serializer.add(ChannelDataType::NICKNAME_CHANGE);
            serializer.add((u8)newNick.size());
            serializer.add((const u8*)newNick.data(), newNick.size());
            
            database->addData(databaseNodeInfo, onlineLocalUser->keyPair, odhtdb::DataView(serializer.getBuffer().data(), serializer.getBuffer().size()));
        }
    }
    
    void Channel::setAvatar(const string &newAvatarUrl)
    {
        if(database && localUser->type == User::Type::ONLINE_LOCAL_USER)
        {
            auto onlineLocalUser = static_cast<OnlineLocalUser*>(localUser);
            
            sibs::SafeSerializer serializer;
            serializer.add(ChannelDataType::CHANGE_AVATAR);
            serializer.add((u16)newAvatarUrl.size());
            serializer.add((const u8*)newAvatarUrl.data(), newAvatarUrl.size());
            
            database->addData(databaseNodeInfo, onlineLocalUser->keyPair, odhtdb::DataView(serializer.getBuffer().data(), serializer.getBuffer().size()));
        }
    }
    
    void Channel::setNameLocally(const string &name)
    {
        this->name = name;
    }
    
    void Channel::setName(const string &name)
    {
        if(database && localUser->type == User::Type::ONLINE_LOCAL_USER)
        {
            auto onlineLocalUser = static_cast<OnlineLocalUser*>(localUser);
            
            sibs::SafeSerializer serializer;
            serializer.add(ChannelDataType::CHANGE_CHANNEL_NAME);
            serializer.add((u16)name.size());
            serializer.add((const u8*)name.data(), name.size());
            
            database->addData(databaseNodeInfo, onlineLocalUser->keyPair, odhtdb::DataView(serializer.getBuffer().data(), serializer.getBuffer().size()));
        }
    }

    int Channel::getUserLowestPermissionLevel(OnlineUser *user) const
    {
        if(!database) return -1;
        return database->getUserLowestPermissionLevel(*databaseNodeInfo.getRequestHash(), user->getPublicKey());
    }
    
    void Channel::processEvent(const sf::Event &event, Cache &cache)
    {
        chatbar.processEvent(event, cache, this);
        messageBoard.processEvent(event, cache);
    }
    
    void Channel::draw(sf::RenderWindow &window, Cache &cache)
    {
        messageBoard.draw(window, cache);
        chatbar.draw(window, cache);
        //suggestions.draw(window, cache);
    }
    
    void Channel::update()
    {
        if(database && localUser->type == User::Type::ONLINE_LOCAL_USER && pingTimer.getElapsedTime().asMilliseconds() > 5000)
        {
            pingTimer.restart();
            sendPing(database->getSyncedTimestampUtc().seconds);
        }
    }
    
    void Channel::sendPing(u32 pingTimestampSec)
    {
        if(database && localUser->type == User::Type::ONLINE_LOCAL_USER)
        {
            //printf("Sending ping, counter: %u\n", pingCounter);
            auto onlineLocalUser = static_cast<OnlineLocalUser*>(localUser);
            sibs::SafeSerializer serializer;
            serializer.add((const u8*)onlineLocalUser->getPublicKey().getData(), onlineLocalUser->getPublicKey().getSize());
            
            sibs::SafeSerializer signedSerializer;
            signedSerializer.add(pingTimestampSec);
            string signedData = onlineLocalUser->keyPair.getPrivateKey().sign(odhtdb::DataView(signedSerializer.getBuffer().data(), signedSerializer.getBuffer().size()));
            serializer.add((const u8*)signedData.data(), signedData.size());
            database->sendCustomMessage(pingKey, serializer.getBuffer().data(), serializer.getBuffer().size());
        }
    }
    
    u32 Channel::getSyncedTimestampUtcInSec()
    {
        if(!database)
            return 0;
        return database->getSyncedTimestampUtc().seconds;
    }

    const vector<BridgeService*>& Channel::getBridgeServices() const
    {
        return bridgeServices;
    }

    DiscordService* Channel::getDiscordService()
    {
        return (DiscordService*)bridgeServices[0];
    }
    
    void Channel::setCurrent(Channel *channel)
    {
        currentChannel = channel;
    }
    
    Channel* Channel::getCurrent()
    {
        return currentChannel;
    }
}