big refactoring of API system

2024-01-20 18:17:21 -03:00 · 2024-01-20 18:17:21 -03:00 · 7a116bfdf2
commit 7a116bfdf2
parent 27124380e4
37 changed files with 1060 additions and 534 deletions
--- a/API/CMakeLists.txt
+++ b/API/CMakeLists.txt
@ -17,4 +17,4 @@ set(SOURCES

 target_sources(magpie PRIVATE ${SOURCES})

-add_subdirectory(models)
+add_subdirectory(requests)
--- a/API/api.cpp
+++ b/API/api.cpp
@ -7,463 +7,125 @@
 #include <QJsonObject>
 #include <QUrlQuery>

-#include "codes.h"
-#include "finalaction.h"
-#include "helpers.h"
+#include "requests/test.h"
+#include "requests/register.h"
+#include "requests/login.h"
+#include "requests/poll.h"
+#include "requests/listassets.h"
+#include "requests/addasset.h"

-constexpr const char* json = "application/json";
-constexpr const char* urlEncoded = "application/x-www-form-urlencoded";
-
-const std::map<QString, QMetaType::Type> testStructure({
-    {"type", QMetaType::QString},
-    {"version", QMetaType::QString},
-});
-
-const std::map<QString, QMetaType::Type> resultStructure({
-    {"result", QMetaType::LongLong},
-});
-
-const std::map<QString, QMetaType::Type> tokensStructure({
-    {"accessToken", QMetaType::QString},
-    {"renewToken", QMetaType::QString}
-});
-
-struct NetworkReplyDeleter {
-    void operator () (QNetworkReply* reply) {
-        reply->deleteLater();
-    }
-};
-
-API::API(const QUrl& address, QObject* parent):
+API::API (Models::Magpie& magpie, QObject* parent):
    QObject(parent),
-    address(address),
+    idCounter(0),
+    magpie(magpie),
    network(),
-    state(NoServer),
-    accessToken(),
-    renewToken(),
-    firstPoll(),
    pollReply(),
-    assets()
-{
-    firstPoll.setSingleShot(true);
-    firstPoll.setInterval(2000);
-    connect(&firstPoll, &QTimer::timeout, this, &API::onFirstPollSuccess);
-    connect(&assets, &Models::Assets::requestAssets, this, &API::requestAssets);
+    requests()
+{}
+
+void API::cancelRequest (RequestId id) {
+    requests.erase(id);
 }

-QUrl API::getAddress() const {
-    return address;
+void API::onRequestDone (RequestId id) {
+    requests.erase(id);
 }

-API::State API::getState() const {
-    return state;
-}
-
-void API::setTokens(const QString access, const QString &renew) {
-    accessToken = access;
-    renewToken = renew;
-    setState(Authenticating);
-    startPolling();
-}
-
-void API::startPolling() {
-    qDebug() << "Starting polling...";
-    if (state != Authenticating)
-        throw std::runtime_error("Can not start polling in this state: " + std::to_string(state));
-
-    sendPoll();
-    firstPoll.start();
-}
-
-void API::setAddress(const QUrl& path) {
-    if (address == path)
-        return;
-
-    if (state == Authenticated) {
-        //do something
-    }
-
-    address = path;
-    emit addressChanged(address);
-    setState(address.isEmpty() ? NoServer : NotAuthenticated);
-}
-
-std::optional<QVariantMap> API::readResult(QNetworkReply* reply) {
-    QVariant contentType = reply->header(QNetworkRequest::ContentTypeHeader);
-    if (!
-        contentType.isValid() ||
-        contentType.userType() != QMetaType::QString ||
-        contentType.toString() != json
-    )
-        return std::nullopt;
-
-    QByteArray data = reply->readAll();
-    QJsonDocument document = QJsonDocument::fromJson(data);
-    if (!document.isObject())
-        return std::nullopt;
-
-    QJsonObject object = document.object();
-    return object.toVariantMap();
-}
-
-bool API::validateResponse(const std::optional<QVariantMap>& data, const std::map<QString, QMetaType::Type>& structure) {
-    if (!data.has_value())
-        return false;
-
-    for (const std::pair<const QString, QMetaType::Type>& pair : structure) {
-        QVariantMap::ConstIterator itr = data->find(pair.first);
-        if (itr == data->end())
-            return false;
-
-        if (itr->userType() != pair.second)
-            return false;
-    }
-
-    return true;
-}
-
-void API::setState(State newState) {
-    if (newState == state)
-        return;
-
-    state = newState;
-    emit stateChanged(state);
-}
-
-QUrl API::createUrl(const QString &path) const {
-    QString startingPath = address.path();
-    QUrl url = address;
-    url.setPath(startingPath + path);
-    return url;
-}
-
-void API::test(const QString& path, const QJSValue& finished) {
+API::RequestId API::test (const QString& path, const QJSValue& finished) {
    qDebug() << "Testing" << path;
-    if (state == Offline)
-        return callCallback(finished, "Need to be online to test");
+    if (magpie.getState() == Models::Magpie::Offline)
+        callCallback(finished, "Need to be online to test"), 0;

-    QUrl address(path);
-    QNetworkRequest request(path + "/info");
-    request.setHeader(QNetworkRequest::ContentTypeHeader, json);
-
-    QNetworkReply* reply = network.get(request);
-    connect(reply, &QNetworkReply::finished,
-        std::bind(&API::onTestFinished, this, reply, address, finished)
-    );
-}
-
-void API::onTestFinished(QNetworkReply* reply, const QUrl& addr, const QJSValue& finished) {
-    std::unique_ptr<QNetworkReply, NetworkReplyDeleter> rpl(reply);
-    QNetworkReply::NetworkError error = reply->error();
-    if (error != QNetworkReply::NoError)
-        return callCallback(finished, reply->errorString());
-
-    std::optional<QVariantMap> data = readResult(reply);
-    if (!validateResponse(data, testStructure))
-        return callCallback(finished, "Malformed response");
-
-    QString type = data->value("type").toString();
-    if (type != "pica")
-        return callCallback(finished, "server of this type (" + type + ") is not supported");
-
-    QString version = data->value("version").toString();
-    if (version != "0.0.1")
-        return callCallback(finished, "server of this version (" + version + ") is not supported");
-
-    callCallback(finished, QString(), {QJSValue(true)});
-    address = "";       //to provoke singal change even if it's the same server
-    setAddress(addr);
-}
-
-void API::sendRegister(const QString& login, const QString& password, const QJSValue& finished) {
-    qDebug() << "Registering...";
-    if (state != NotAuthenticated)
-        return callCallback(finished, "Can not register in current state");
-
-    QUrlQuery params({
-        {"login", login},
-        {"password", password}
-    });
-
-    QNetworkRequest request(createUrl("/register"));
-    request.setHeader(QNetworkRequest::ContentTypeHeader, urlEncoded);
-
-    QNetworkReply* reply = network.post(request, params.toString(QUrl::FullyEncoded).toUtf8());
-    connect(reply, &QNetworkReply::finished,
-        std::bind(&API::onRegisterFinished, this, reply, finished)
-    );
-}
-
-void API::onRegisterFinished(QNetworkReply* reply, const QJSValue& finished) const {
-    std::unique_ptr<QNetworkReply, NetworkReplyDeleter> rpl(reply);
-    QNetworkReply::NetworkError error = reply->error();
-    std::optional<QVariantMap> data = readResult(reply);
-    std::optional<Codes::Register> code;
-    QString detail;
-    bool success = false;
-    if (validateResponse(data, resultStructure)) {
-        code = Codes::convertRegister(data->value("result").toInt());
-        success = code.value() == Codes::Register::success;
-        if (!success)
-            detail = Codes::description(code.value());
-    }
-
-    if (error != QNetworkReply::NoError)
-        return callCallback(finished, reply->errorString() + (success ? "" : ": " + detail));
-
-    if (!code)
-        return callCallback(finished, "Malformed result");
-
-    callCallback(finished, detail, {QJSValue(success)});
-}
-
-void API::sendLogin(const QString& login, const QString& password, const QJSValue& finished) {
-    qDebug() << "Logging in...";
-    if (state != NotAuthenticated)
-        return callCallback(finished, "Can not register in current state");
-
-    QUrlQuery params({
-        {"login", login},
-        {"password", password}
-    });
-
-    QNetworkRequest request(createUrl("/login"));
-    request.setHeader(QNetworkRequest::ContentTypeHeader, urlEncoded);
-    setState(Authenticating);
-    QNetworkReply* reply = network.post(request, params.toString(QUrl::FullyEncoded).toUtf8());
-    connect(reply, &QNetworkReply::finished,
-            std::bind(&API::onLoginFinished, this, reply, finished)
-            );
-}
-
-void API::onLoginFinished(QNetworkReply* reply, const QJSValue& finished) {
-    State state = NotAuthenticated;
-    FinalAction action([this, &state]() {       //this should be executed on leaving the function in any way
-        setState(state);                        //setting the state as a result of this object destruction
-    });                                         //this way any error will result in NotAuthenticated, and on success it should be Authenticated
-
-    std::unique_ptr<QNetworkReply, NetworkReplyDeleter> rpl(reply);
-    QNetworkReply::NetworkError error = reply->error();
-    std::optional<QVariantMap> data = readResult(reply);
-    std::optional<Codes::Login> code;
-    QString detail;
-    bool success = false;
-    if (validateResponse(data, resultStructure)) {
-        code = Codes::convertLogin(data->value("result").toInt());
-        success = code.value() == Codes::Login::success;
-        if (!success)
-            detail = Codes::description(code.value());
-    }
-
-    if (error != QNetworkReply::NoError)
-        return callCallback(finished, reply->errorString() + (success ? "" : ": " + detail));
-
-    if (!code)
-        return callCallback(finished, "Malformed result");
-
-    if (!validateResponse(data, tokensStructure))
-        return callCallback(finished, "Malformed result: missing tokens");
-
-
-    callCallback(finished, detail, {QJSValue(success)});
-
-    state = Authenticating;
-    accessToken = data->value("accessToken").toString();
-    renewToken = data->value("renewToken").toString();
-    emit storeTokens(accessToken, renewToken);
-    startPolling();
-}
-
-void API::addAsset(const QString& title, const QString& icon, const QJSValue &finished) {
-    qDebug() << "Adding asset...";
-    if (state != Authenticated)
-        return callCallback(finished, "Can not add assets in current state");
-
-    QUrlQuery params({
-        {"title", title},
-        {"icon", icon},
-        {"currency", "1"}
-    });
-
-    QNetworkRequest request(createUrl("/addAsset"));
-    request.setHeader(QNetworkRequest::ContentTypeHeader, urlEncoded);
-    request.setRawHeader("Authorization", "Bearer " + accessToken.toUtf8());
-    QNetworkReply* reply = network.post(request, params.toString(QUrl::FullyEncoded).toUtf8());
-    connect(reply, &QNetworkReply::finished,
-        this, std::bind(&API::onAssetAdded, this, reply, finished),
-        Qt::QueuedConnection
-    );
-}
-
-void API::onAssetAdded(QNetworkReply *reply, const QJSValue &finished) {
-    std::unique_ptr<QNetworkReply, NetworkReplyDeleter> rpl(reply);
-    QNetworkReply::NetworkError error = reply->error();
-
-    qDebug() << error;
-    if (error != QNetworkReply::NoError)
-        return callCallback(finished, reply->errorString());
-
-    callCallback(finished, QString(), {QJSValue(true)});
-}
-
-void API::sendPoll(bool clear) {
-    if (accessToken.isEmpty())
-        throw std::runtime_error("Can not start polling: access token is empty");
-
-    QUrl url = createUrl("/poll");
-    if (clear)
-        url.setQuery(QUrlQuery({{"clearCache", "all"}}));
-
-    QNetworkRequest request(url);
-    request.setHeader(QNetworkRequest::ContentTypeHeader, json);
-    request.setRawHeader("Authorization", "Bearer " + accessToken.toUtf8());
-    request.setTransferTimeout(30000);
-
-    pollReply = std::unique_ptr<QNetworkReply>(network.get(request));
+    std::unique_ptr<Request::Test> test = std::make_unique<Request::Test>(path);
    connect(
-        pollReply.get(), &QNetworkReply::finished,
-        this, &API::onPollFinished, Qt::QueuedConnection
+        test.get(),
+        &Request::Test::success,
+        this,
+        [this, &path, &finished] (const QVariantMap& data) {
+            callCallback(finished, QString(), {QJSValue(true)});
+            magpie.forceAddress(path);
+        }
    );
+    connect(test.get(), &Request::Test::error, std::bind(&API::callCallback, this, finished, std::placeholders::_1, QJSValueList(false)));
+    return registerAndSend(std::move(test));
 }

-void API::onPollFinished() {
-    firstPoll.stop();
-    QNetworkReply::NetworkError error = pollReply->error();
-    std::optional<QVariantMap> data = readResult(pollReply.get());
-    Codes::Poll code = Codes::Poll::unknownError;
-    if (validateResponse(data, resultStructure))
-        code = Codes::convertPoll(data->value("result").toInt());
-    else
-        qDebug() << "";
+API::RequestId API::sendRegister (const QString& login, const QString& password, const QJSValue& finished) {
+    qDebug() << "Registering...";
+    if (magpie.getState() != Models::Magpie::NotAuthenticated)
+        return callCallback(finished, "Can not register in current state"), 0;

-    QString detail = Codes::description(code);
-
-    if (error != QNetworkReply::NoError)
-        qDebug() << pollReply->errorString() + ": " + detail;
-    else
-        qDebug() << "Poll finished: " + detail;
-
-    bool clear = false;
-    switch (code) {
-        case Codes::Poll::success: {
-            QVariantMap::ConstIterator itr = data->constFind("data");
-            if (itr == data->constEnd())
-                qDebug("received a poll that claimed to have some updates, but the \"data\" field is abscent");
-
-            const QVariant& vdata = itr.value();
-            if (vdata.canConvert<QVariantMap>())
-                clear = handleChanges(qast<QVariantMap>(itr.value()));
-            else
-                qDebug("received a poll that claimed to have some updates, but the \"data\" field is not an object");
-        }
-            //todo handle the result
-        case Codes::Poll::timeout:
-            setState(Authenticated);
-            return sendPoll(clear);
-        case Codes::Poll::tokenProblem:
-        case Codes::Poll::replace:
-        case Codes::Poll::unknownError: //todo this one doesn't actually mean that we can't work for now, the network may be temporarily down or something
-            pollReply.reset();
-            return setState(NotAuthenticated);
-    }
+    std::unique_ptr<Request::Register> reg = std::make_unique<Request::Register>(login, password, magpie.getAddress());
+    connect(reg.get(), &Request::Register::success, std::bind(&API::callCallback, this, finished, QString(), QJSValueList{QJSValue(true)}));
+    connect(reg.get(), &Request::Register::error, std::bind(&API::callCallback, this, finished, std::placeholders::_1, QJSValueList{QJSValue(false)}));
+    return registerAndSend(std::move(reg));
 }

-bool API::handleChanges(const QVariantMap& changes) {
-    QVariantMap::ConstIterator itr = changes.constFind("system");
-    if (itr != changes.constEnd() && itr.value().canConvert<QVariantMap>()) {
-        const QVariantMap& sys = qast<QVariantMap>(itr.value());
-        QVariantMap::ConstIterator invItr = sys.constFind("invalidate");
-        if (invItr != sys.constEnd()) {
-            const QVariant& vinv = invItr.value();
-            if (vinv.canConvert<bool>() && vinv.toBool())
-                resetAllModels();
+API::RequestId API::sendLogin (const QString& login, const QString& password, const QJSValue& finished) {
+    qDebug() << "Logging in...";
+    if (magpie.getState() != Models::Magpie::NotAuthenticated)
+        return callCallback(finished, "Can not register in current state"), 0;
+
+    std::unique_ptr<Request::Login> log = std::make_unique<Request::Login>(login, password, magpie.getAddress());
+    connect(
+        log.get(),
+        &Request::Login::success,
+        this,
+        [this, &finished] (const QVariantMap& data) {
+            callCallback(finished, QString(), {QJSValue(true)});
+            magpie.setTokens(data.value("accessToken").toString(), data.value("renewToken").toString());
        }
+    );
+    connect(
+        log.get(),
+        &Request::Login::error,
+        this,
+        [this, &finished] (const QString& error) {
+            callCallback(finished, error, {QJSValue(false)});
+            magpie.setState(Models::Magpie::NotAuthenticated);
+        }
+    );
+
+    magpie.setState(Models::Magpie::Authenticating);
+    return registerAndSend(std::move(log));
 }

-    itr = changes.constFind("assets");
-    if (itr != changes.constEnd() && itr.value().canConvert<QVariantMap>()) {
-        const QVariantMap& assets = qast<QVariantMap>(itr.value());
-        QVariantMap::ConstIterator aItr = assets.constFind("invalidate");
-        if (aItr != assets.constEnd()) {
-            const QVariant& vinv = aItr.value();
-            if (vinv.canConvert<bool>() && vinv.toBool())
-                API::assets.clear();
+API::RequestId API::addAsset (const QString& title, const QString& icon, const QJSValue& finished) {
+    qDebug() << "Adding asset...";
+    if (magpie.getState() != Models::Magpie::Authenticated)
+        return callCallback(finished, "Can not add assets in current state"), 0;
+
+    auto add = std::make_unique<Request::AddAsset>(title, icon, QColor::fromString("black"), 1, magpie.getAddress());
+    add->setAuthorizationToken(magpie.getAccessToken());
+    connect(add.get(), &Request::AddAsset::success, std::bind(&API::callCallback, this, finished, QString(), QJSValueList{QJSValue(true)}));
+    connect(add.get(), &Request::AddAsset::error, std::bind(&API::callCallback, this, finished, std::placeholders::_1, QJSValueList{QJSValue(false)}));
+    return registerAndSend(std::move(add));
 }

-        aItr = assets.constFind("added");
-        if (aItr != assets.constEnd() && aItr.value().canConvert<QVariantList>()) {
-            std::deque<Models::Asset> added;
-            if (!Models::Assets::deserialize(qast<QVariantList>(aItr.value()), added))
-                qDebug() << "Error deserializng added assets";
-            else
-                API::assets.addAssets(added);
-        }
-    }
-
-    return true;
-}
-
-void API::resetAllModels() {
-    assets.clear();
-}
-
-void API::onFirstPollSuccess() {
-    setState(Authenticated);
-}
-
-void API::requestAssets() {
-    if (state != Authenticated) {
-        qDebug() << "An attempt to request assets on unauthenticated state";
-        assets.receivedAssets({});
-        return;
-    }
+API::RequestId API::requestAssets (const SuccessListHandler& success, const ErrorHandler& error) {
    qDebug() << "Requesting assets...";

-    QUrl url = createUrl("/listAssets");
-    QNetworkRequest request(url);
-    request.setHeader(QNetworkRequest::ContentTypeHeader, json);
-    request.setRawHeader("Authorization", "Bearer " + accessToken.toUtf8());
-
-    QNetworkReply* reply = network.get(request);
-    connect(
-        reply, &QNetworkReply::finished,
-        this, std::bind(&API::responseAssets, this, reply)
-    );
+    auto list = std::make_unique<Request::ListAssets>(magpie.getAddress());
+    list->setAuthorizationToken(magpie.getAccessToken());
+    connect(list.get(), &Request::ListAssets::success, success);
+    connect(list.get(), &Request::ListAssets::error, error);
+    return registerAndSend(std::move(list));
 }

-void API::responseAssets(QNetworkReply *reply) {
-    std::deque<Models::Asset> result;
-    FinalAction action([this, &result]() {
-        assets.receivedAssets(result);
-    });
-
-    std::unique_ptr<QNetworkReply, NetworkReplyDeleter> rpl(reply);
-    QNetworkReply::NetworkError error = reply->error();
-
-    if (error != QNetworkReply::NoError) {
-        qDebug() << "Error receiving assets:" << reply->errorString();
-        return;
+API::RequestId API::poll (const SuccessMapHandler& success, const ErrorHandler& error, bool clear) {
+    auto poll = std::make_unique<Request::Poll>(magpie.getAddress(), clear);
+    poll->setAuthorizationToken(magpie.getAccessToken());
+    connect(poll.get(), &Request::Poll::success, success);
+    connect(poll.get(), &Request::Poll::error, error);
+    return registerAndSend(std::move(poll));
 }

-    std::optional<QVariantMap> data = readResult(reply);
-    if (!data) {
-        qDebug() << "Error receiving assets: bad data";
-        return;
-    }
-
-    QVariantMap::ConstIterator itr = data->find("assets");
-    if (itr == data->constEnd() || !itr->canConvert<QVariantList>()) {
-        qDebug() << "Error receiving assets: assets are missing or not in an array";
-        return;
-    }
-
-    if (!Models::Assets::deserialize(qast<QVariantList>(itr.value()), result)) {
-        qDebug() << "Error deserializng assets";
-        result.clear();
-    }
-
-    qDebug() << "Assets successfully received";
-    //final action goes automatically
+API::RequestId API::registerAndSend (std::unique_ptr<Request::Request> request) {
+    Request::Request* req = request.get();
+    requests.emplace(++idCounter, std::move(request));
+    connect(req, &Request::Request::done, std::bind(&API::onRequestDone, this, idCounter));
+    req->send(network);
+    return idCounter;
 }

 void API::callCallback (const QJSValue& callback, const QString& error, const QJSValueList& arguments) const {
@ -474,4 +136,3 @@ void API::callCallback(const QJSValue& callback, const QString& error, const QJS
            callback.call({QJSValue(error)});
    }
 }
-
--- a/API/api.h
+++ b/API/api.h
@ -6,6 +6,7 @@
 #include <memory>
 #include <optional>
 #include <map>
+#include <functional>

 #include <QObject>
 #include <QString>
@ -13,80 +14,45 @@
 #include <QJSValue>
 #include <QNetworkAccessManager>
 #include <QNetworkReply>
-#include <QTimer>

-#include "models/assets.h"
+#include "models/magpie.h"
+#include "requests/request.h"

-class Root;
 class API : public QObject {
-    friend class Root;
    Q_OBJECT
-public:
-    enum State {
-        Offline,
-        NoServer,
-        NotAuthenticated,
-        Authenticating,
-        Authenticated
-    };
-    Q_ENUM(State)
-
-private:
-    Q_PROPERTY(QUrl address READ getAddress NOTIFY addressChanged)
-    Q_PROPERTY(State state READ getState NOTIFY stateChanged)

 public:
-    explicit API(const QUrl& path = QString(), QObject* parent = nullptr);
+    using SuccessMapHandler = std::function<void(const QVariantMap&)>;
+    using SuccessListHandler = std::function<void(const QVariantList&)>;
+    using ErrorHandler = std::function<void(const QString&, const std::optional<QVariantMap>&)>;
+    using RequestId = unsigned int;

-    QUrl getAddress() const;
-    State getState() const;
-    void setTokens(const QString access, const QString& renew);
-    void startPolling();
+    explicit API(Models::Magpie& magpie, QObject* parent = nullptr);

-signals:
-    void addressChanged(const QUrl& path);
-    void stateChanged(State state);

-    void storeTokens(const QString& access, const QString& renew);
+    RequestId requestAssets(const SuccessListHandler& success, const ErrorHandler& error);
+    RequestId poll(const SuccessMapHandler& success, const ErrorHandler& error, bool clear = false);
+
+    static const RequestId none = 0;

 public slots:
-    void test(const QString& path, const QJSValue& finished = QJSValue());
-    void sendRegister(const QString& login, const QString& password, const QJSValue& finished = QJSValue());
-    void sendLogin(const QString& login, const QString& password, const QJSValue& finished = QJSValue());
-    void addAsset(const QString& title, const QString& icon, const QJSValue& finished = QJSValue());
+    void cancelRequest(RequestId id);
+    RequestId test(const QString& path, const QJSValue& finished = QJSValue());
+    RequestId sendRegister(const QString& login, const QString& password, const QJSValue& finished = QJSValue());
+    RequestId sendLogin(const QString& login, const QString& password, const QJSValue& finished = QJSValue());
+    RequestId addAsset(const QString& title, const QString& icon, const QJSValue& finished = QJSValue());

 private slots:
-    void onTestFinished(QNetworkReply* reply, const QUrl& addr, const QJSValue& finished);
-    void onRegisterFinished(QNetworkReply* reply, const QJSValue& finished) const;
-    void onLoginFinished(QNetworkReply* reply, const QJSValue& finished);
-    void onAssetAdded(QNetworkReply* reply, const QJSValue& finished);
-    void onPollFinished();
-
-    void onFirstPollSuccess();
-
-    void requestAssets();
-    void responseAssets(QNetworkReply* reply);
+    void onRequestDone(RequestId id);

 private:
    void callCallback(const QJSValue& callback, const QString& error = QString(), const QJSValueList& arguments = QJSValueList()) const;
-    void setAddress(const QUrl& path);
-    static std::optional<QVariantMap> readResult(QNetworkReply* reply);
-    static bool validateResponse(const std::optional<QVariantMap>& data, const std::map<QString, QMetaType::Type>& structure);
-    void setState(State newState);
-    QUrl createUrl(const QString& path) const;
-    void sendPoll(bool clear = false);
-    bool handleChanges(const QVariantMap& changes);
-    void resetAllModels();
+    RequestId registerAndSend(std::unique_ptr<Request::Request> request);

 private:
-    QUrl address;
+    RequestId idCounter;
+    Models::Magpie& magpie;
    QNetworkAccessManager network;
-    State state;
-    QString accessToken;
-    QString renewToken;
-    QTimer firstPoll;
+    std::map<RequestId, std::unique_ptr<Request::Request>> requests;
    std::unique_ptr<QNetworkReply> pollReply;
-
-public:
-    Models::Assets assets;
 };
--- a/API/helpers.h
+++ b/API/helpers.h
@ -6,6 +6,8 @@
 #include <QVariant>
 #include <stdexcept>

+#define UNUSED(X) (void)(X)
+
 template <class T>
 const T& qast(const QVariant& variant) {
    if (variant.userType() == qMetaTypeId<T>())
--- a/API/requests/CMakeLists.txt
+++ b/API/requests/CMakeLists.txt
@ -0,0 +1,26 @@
+# SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+set(HEADERS
+    request.h
+    test.h
+    post.h
+    register.h
+    login.h
+    poll.h
+    listassets.h
+    addasset.h
+)
+
+set(SOURCES
+    request.cpp
+    test.cpp
+    post.cpp
+    register.cpp
+    login.cpp
+    poll.cpp
+    listassets.cpp
+    addasset.cpp
+)
+
+target_sources(magpie PRIVATE ${SOURCES})
--- a/API/requests/addasset.cpp
+++ b/API/requests/addasset.cpp
@ -0,0 +1,10 @@
+//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "addasset.h"
+
+Request::AddAsset::AddAsset (const QString& title, const QString& icon, const QColor& color, unsigned int currency, const QUrl& baseUrl):
+    Post(createUrl(baseUrl, "/addAsset"), {{"title", title}, {"icon", icon}, {"currency", std::to_string(currency).c_str()}, {"color", "0"}})
+{
+    emptyResult = true;
+}
--- a/API/requests/addasset.h
+++ b/API/requests/addasset.h
@ -0,0 +1,19 @@
+//  SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//  SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <QColor>
+
+#include "post.h"
+
+namespace Request {
+
+class AddAsset : public Post {
+    Q_OBJECT
+
+public:
+    AddAsset (const QString& title, const QString& icon, const QColor& color, unsigned int currency, const QUrl& baseUrl);
+};
+
+}
--- a/API/requests/listassets.cpp
+++ b/API/requests/listassets.cpp
@ -0,0 +1,18 @@
+//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "listassets.h"
+
+#include "API/helpers.h"
+
+Request::ListAssets::ListAssets (const QUrl& baseUrl):
+    Request(createUrl(baseUrl, "/listAssets")) {}
+
+void Request::ListAssets::onSuccess (const QVariantMap& data) {
+    QVariantMap::ConstIterator itr = data.find("assets");
+    if (itr == data.constEnd() || !itr->canConvert<QVariantList>())
+        return Request::onError("Error receiving assets: assets are missing or not in an array", std::nullopt);
+
+    emit success(qast<QVariantList>(itr.value()));
+    emit done();
+}
--- a/API/requests/listassets.h
+++ b/API/requests/listassets.h
@ -0,0 +1,23 @@
+//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "request.h"
+
+namespace Request {
+
+class ListAssets : public Request {
+    Q_OBJECT
+
+public:
+    ListAssets (const QUrl& baseUrl);
+
+signals:
+    void success(const QVariantList& assets);
+
+protected:
+    void onSuccess (const QVariantMap& data) override;
+};
+
+}
--- a/API/requests/login.cpp
+++ b/API/requests/login.cpp
@ -0,0 +1,34 @@
+//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "login.h"
+
+#include "API/codes.h"
+
+const std::map<QString, QMetaType::Type> Request::Login::tokensStructure({
+    {"accessToken", QMetaType::QString}, {"renewToken", QMetaType::QString}
+});
+
+Request::Login::Login (const QString& login, const QString& password, const QUrl& baseUrl):
+    Post(createUrl(baseUrl, "/login"), {{"login", login}, {"password", password}}) {}
+
+void Request::Login::onSuccess (const QVariantMap& data) {
+    if (!validateResponse(data, resultStructure))
+        return Request::onError("Malformed response", std::nullopt);
+
+    if (!validateResponse(data, tokensStructure))
+        return Request::onError("Malformed result: missing tokens", std::nullopt);
+
+    Codes::Login code = Codes::convertLogin(data.value("result").toInt());
+    if (code != Codes::Login::success)
+        return Request::onError("Failed to login: " + Codes::description(code), data);
+
+    Request::onSuccess(data);
+}
+
+void Request::Login::onError (const QString& err, const std::optional<QVariantMap>& data) {
+    if (validateResponse(data, resultStructure))
+        Request::onError(err + ": " + Codes::description(Codes::convertLogin(data->value("result").toInt())), data);
+    else
+        Request::onError(err, data);
+}
--- a/API/requests/login.h
+++ b/API/requests/login.h
@ -0,0 +1,23 @@
+//  SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//  SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "post.h"
+
+namespace Request {
+
+class Login : public Post {
+    Q_OBJECT
+
+public:
+    Login (const QString& login, const QString& password, const QUrl& baseUrl);
+
+protected:
+    void onSuccess (const QVariantMap& data) override;
+    void onError (const QString& error, const std::optional<QVariantMap>& data) override;
+
+    static const std::map<QString, QMetaType::Type> tokensStructure;
+};
+
+}
--- a/API/requests/poll.cpp
+++ b/API/requests/poll.cpp
@ -0,0 +1,46 @@
+//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "poll.h"
+
+#include <QUrlQuery>
+
+#include "API/codes.h"
+
+const std::map<QString, QMetaType::Type> Request::Poll::updatesStructure({
+    {"data", QMetaType::QVariantMap},
+});
+
+Request::Poll::Poll (const QUrl& baseUrl, bool clear):
+    Request(createUrl(baseUrl, "/poll", clear))
+{
+    request.setTransferTimeout(30000);
+}
+
+void Request::Poll::onSuccess (const QVariantMap& data) {
+    if (!validateResponse(data, resultStructure))
+        return Request::onError("Malformed response", std::nullopt);
+
+    Codes::Poll code = Codes::convertPoll(data.value("result").toInt());
+    if (code == Codes::Poll::success)
+        if (!validateResponse(data, updatesStructure))
+            return onError("Malformed response: received a poll that claimed to have some updates, but the \"data\" field is abscent", data);
+
+    Request::onSuccess(data);
+}
+
+void Request::Poll::onError (const QString& err, const std::optional<QVariantMap>& data) {
+    if (validateResponse(data, resultStructure))
+        Request::onError(err + ": " + Codes::description(Codes::convertPoll(data->value("result").toInt())), data);
+    else
+        Request::onError(err, data);
+}
+
+QUrl Request::Poll::createUrl (QUrl base, const QString& path, bool clear) {
+    QString startingPath = base.path();
+    base.setPath(startingPath + path);
+    if (clear)
+        base.setQuery(QUrlQuery({{"clearCache", "all"}}));
+
+    return base;
+}
--- a/API/requests/poll.h
+++ b/API/requests/poll.h
@ -0,0 +1,25 @@
+//  SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//  SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "request.h"
+
+namespace Request {
+
+class Poll : public Request {
+    Q_OBJECT
+
+public:
+    Poll (const QUrl& baseUrl, bool clear = false);
+
+protected:
+    void onSuccess (const QVariantMap& data) override;
+    void onError (const QString& error, const std::optional<QVariantMap>& data) override;
+
+    static QUrl createUrl(QUrl base, const QString& path, bool clear);
+
+    static const std::map<QString, QMetaType::Type> updatesStructure;
+};
+
+}
--- a/API/requests/post.cpp
+++ b/API/requests/post.cpp
@ -0,0 +1,17 @@
+//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "post.h"
+
+Request::Post::Post (const QUrl& url, const QUrlQuery& form):
+    Request(url),
+    form(form)
+{}
+
+void Request::Post::aquireRequest (QNetworkAccessManager& manager) {
+    reply = std::unique_ptr<QNetworkReply, NetworkReplyDeleter>(manager.post(request, form.toString(QUrl::FullyEncoded).toUtf8()));
+}
+
+void Request::Post::initializeRequest () {
+    request.setHeader(QNetworkRequest::ContentTypeHeader, urlEncoded);
+}
--- a/API/requests/post.h
+++ b/API/requests/post.h
@ -0,0 +1,25 @@
+//  SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//  SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "request.h"
+
+#include <QUrlQuery>
+
+namespace Request {
+
+class Post : public Request {
+    Q_OBJECT
+public:
+    Post(const QUrl& url, const QUrlQuery& form);
+
+protected:
+    void aquireRequest (QNetworkAccessManager &manager) override;
+    void initializeRequest () override;
+
+protected:
+    QUrlQuery form;
+};
+
+}
--- a/API/requests/register.cpp
+++ b/API/requests/register.cpp
@ -0,0 +1,29 @@
+//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "register.h"
+
+#include <QUrlQuery>
+
+#include "API/codes.h"
+
+Request::Register::Register (const QString& login, const QString& password, const QUrl& baseUrl):
+    Post(createUrl(baseUrl, "/register"), {{"login", login}, {"password", password}}) {}
+
+void Request::Register::onSuccess (const QVariantMap& data) {
+    if (!validateResponse(data, resultStructure))
+        return Request::onError("Malformed response", std::nullopt);
+
+    Codes::Register code = Codes::convertRegister(data.value("result").toInt());
+    if (code != Codes::Register::success)
+        return Request::onError("Failed to register: " + Codes::description(code), data);
+
+    Request::onSuccess(data);
+}
+
+void Request::Register::onError (const QString& err, const std::optional<QVariantMap>& data) {
+    if (validateResponse(data, resultStructure))
+        Request::onError(err + ": " + Codes::description(Codes::convertRegister(data->value("result").toInt())), data);
+    else
+        Request::onError(err, data);
+}
--- a/API/requests/register.h
+++ b/API/requests/register.h
@ -0,0 +1,21 @@
+//  SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//  SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "post.h"
+
+namespace Request {
+
+class Register : public Post {
+    Q_OBJECT
+
+public:
+    Register (const QString& login, const QString& password, const QUrl& baseUrl);
+
+protected:
+    void onSuccess (const QVariantMap& data) override;
+    void onError (const QString& error, const std::optional<QVariantMap>& data) override;
+};
+
+}
--- a/API/requests/request.cpp
+++ b/API/requests/request.cpp
@ -0,0 +1,134 @@
+//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "request.h"
+
+#include <QJsonDocument>
+#include <QJsonObject>
+
+const std::map<QString, QMetaType::Type> Request::Request::resultStructure({
+    {"result", QMetaType::LongLong},
+});
+
+Request::Request::Request (const QUrl& url):
+    state(State::initial),
+    request(url),
+    reply(),
+    emptyResult(false)
+{}
+
+Request::Request::~Request () {
+    cancel();
+}
+
+void Request::Request::send (QNetworkAccessManager& manager) {
+    if (state != State::initial)
+        throw new std::runtime_error("An attempt to send a request in a wrong state");
+
+    initializeRequest();
+    aquireRequest(manager);
+    connect(reply.get(), &QNetworkReply::finished, this, &Request::onFinished, Qt::QueuedConnection);
+    state = State::sent;
+}
+
+void Request::Request::cancel () {
+    if (stateTerminal())
+        return;
+
+    state = State::cancelled;
+    if (reply)
+        reply->abort();
+}
+
+void Request::Request::setAuthorizationToken (const QString& token) {
+    request.setRawHeader("Authorization", "Bearer " + token.toUtf8());
+}
+
+void Request::Request::aquireRequest (QNetworkAccessManager& manager) {
+    reply = std::unique_ptr<QNetworkReply, NetworkReplyDeleter>(manager.get(request));
+}
+
+void Request::Request::initializeRequest () {
+    request.setHeader(QNetworkRequest::ContentTypeHeader, json);
+}
+
+std::optional<QString> Request::Request::validate () {
+    QNetworkReply::NetworkError error = reply->error();
+
+    if (error != QNetworkReply::NoError)
+        return reply->errorString();
+    else
+        return std::nullopt;
+}
+
+std::optional<QVariantMap> Request::Request::readResult () {
+    QVariant contentType = reply->header(QNetworkRequest::ContentTypeHeader);
+    if (!contentType.isValid() || !contentType.canConvert<QString>() || contentType.toString() != json)
+        return std::nullopt;
+
+    QByteArray data = reply->readAll();
+    QJsonDocument document = QJsonDocument::fromJson(data);
+    if (!document.isObject())
+        return std::nullopt;
+
+    QJsonObject object = document.object();
+    return object.toVariantMap();
+}
+
+void Request::Request::onSuccess (const QVariantMap& data) {
+    emit success(data);
+    emit done();
+}
+
+void Request::Request::onError (const QString& err, const std::optional<QVariantMap>& data) {
+    emit error(err, data);
+    emit done();
+}
+
+bool Request::Request::validateResponse (const std::optional<QVariantMap>& data, const std::map<QString, QMetaType::Type>& structure) {
+    if (!data.has_value())
+        return false;
+
+    for (const std::pair<const QString, QMetaType::Type>& pair : structure) {
+        QVariantMap::ConstIterator itr = data->find(pair.first);
+        if (itr == data->end())
+            return false;
+
+        if (itr->userType() != pair.second)
+            return false;
+    }
+
+    return true;
+}
+
+QUrl Request::Request::createUrl (QUrl base, const QString& path) {
+    QString startingPath = base.path();
+    base.setPath(startingPath + path);
+    return base;
+}
+
+bool Request::Request::stateTerminal () const {
+    return state == State::responded || state == State::cancelled;
+}
+
+void Request::Request::onFinished () {
+    if (state != State::sent)
+        return;
+
+    state = State::responded;
+    std::optional<QString> err = validate();
+    std::optional<QVariantMap> data;
+    if (!emptyResult)
+        data = readResult();
+
+    if (err)
+        return onError(err.value(), data);
+
+    if (emptyResult)
+        return onSuccess({});
+
+    if (data)
+        return onSuccess(data.value());
+    else
+        return onError("Error reading request result", data);
+}
--- a/API/requests/request.h
+++ b/API/requests/request.h
@ -0,0 +1,69 @@
+//  SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//  SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <memory>
+#include <optional>
+
+#include <QObject>
+#include <QString>
+#include <QVariantMap>
+#include <QNetworkReply>
+
+namespace Request {
+class Request : public QObject {
+    Q_OBJECT
+
+public:
+    Request (const QUrl& url);
+    virtual ~Request ();
+
+    void send (QNetworkAccessManager& manager);
+    void cancel ();
+    void setAuthorizationToken(const QString& token);
+
+signals:
+    void done ();
+    void success (const QVariantMap& data);
+    void error (const QString& error, const std::optional<QVariantMap>& data);
+
+protected:
+    virtual void aquireRequest (QNetworkAccessManager& manager);
+    virtual void initializeRequest ();
+    virtual void onSuccess (const QVariantMap& data);
+    virtual void onError (const QString& error, const std::optional<QVariantMap>& data);
+
+    std::optional<QString> validate ();
+    std::optional<QVariantMap> readResult ();
+
+    static bool validateResponse (const std::optional<QVariantMap>& data, const std::map<QString, QMetaType::Type>& structure);
+    static QUrl createUrl(QUrl base, const QString& path);
+    bool stateTerminal() const;
+
+    constexpr static const char * const json = "application/json";
+    constexpr static const char * const urlEncoded = "application/x-www-form-urlencoded";
+
+private slots:
+    void onFinished ();
+
+protected:
+    static const std::map<QString, QMetaType::Type> resultStructure;
+    enum class State {
+        initial,
+        sent,
+        responded,
+        cancelled
+    };
+    struct NetworkReplyDeleter {
+        void operator () (QNetworkReply* reply) {
+            reply->deleteLater();
+        }
+    };
+
+    State state;
+    QNetworkRequest request;
+    std::unique_ptr<QNetworkReply, NetworkReplyDeleter> reply;
+    bool emptyResult;
+};
+}
--- a/API/requests/test.cpp
+++ b/API/requests/test.cpp
@ -0,0 +1,27 @@
+//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "test.h"
+
+const std::map<QString, QMetaType::Type> Request::Test::structure({
+    {"type", QMetaType::QString}, {"version", QMetaType::QString},
+});
+
+Request::Test::Test (const QString& path):
+    Request(path + "/test")
+{}
+
+void Request::Test::onSuccess (const QVariantMap& data) {
+    if (!validateResponse(data, structure))
+        return onError("Malformed response", data);
+
+    QString type = data.value("type").toString();
+    if (type != "pica")
+        return onError("server of this type (" + type + ") is not supported", data);
+
+    QString version = data.value("version").toString();
+    if (version != "0.0.1")
+        return onError("server of this version (" + version + ") is not supported", data);
+
+    Request::onSuccess(data);
+}
--- a/API/requests/test.h
+++ b/API/requests/test.h
@ -0,0 +1,23 @@
+//  SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//  SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "request.h"
+
+namespace Request {
+
+class Test : public Request {
+    Q_OBJECT
+
+public:
+    Test (const QString& path);
+
+protected:
+    void onSuccess (const QVariantMap &data) override;
+
+private:
+    static const std::map<QString, QMetaType::Type> structure;
+};
+
+}
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -59,7 +59,9 @@ endif()

 add_subdirectory(qml)
 add_subdirectory(API)
+add_subdirectory(models)

+target_include_directories(magpie PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
 target_link_libraries(magpie PRIVATE
    Qt6::Core
    Qt6::Gui
--- a/API/models/CMakeLists.txt
+++ b/API/models/CMakeLists.txt
@ -2,10 +2,12 @@
 # SPDX-License-Identifier: GPL-3.0-or-later

 set(HEADERS
+    magpie.h
    assets.h
 )

 set(SOURCES
+    magpie.cpp
    assets.cpp
 )

--- a/API/models/assets.cpp
+++ b/API/models/assets.cpp
@ -3,7 +3,7 @@

 #include "assets.h"

-#include "../helpers.h"
+#include "API/helpers.h"

 Models::Assets::Assets (QObject* parent):
    QAbstractListModel(parent),
@ -22,7 +22,7 @@ void Models::Assets::addAsset (const Asset& asset) {
    if (index.isValid())
        throw std::runtime_error("An attempt to insert a duplicating Asset to an asset model");

-    beginInsertRows(QModelIndex(), records.size(), records.size() + 1);
+    beginInsertRows(QModelIndex(), records.size(), records.size());
    records.push_back(asset);
    endInsertRows();
 }
@ -35,7 +35,7 @@ void Models::Assets::addAssets (const std::deque<Asset>& assets) {
        if (getIndex(asset.id).isValid())
            throw std::runtime_error("An attempt to insert a duplicating Asset to an asset model (bulk)");

-    beginInsertRows(QModelIndex(), records.size(), records.size() + assets.size());
+    beginInsertRows(QModelIndex(), records.size(), records.size() + assets.size() - 1);
    for (const Asset& asset : assets)
        records.push_back(asset);

@ -48,7 +48,7 @@ void Models::Assets::deleteAsset (unsigned int id) {
        throw std::runtime_error("An attempt to insert to delete non existing Asset from asset model");

    int row = index.row();
-    beginRemoveRows(QModelIndex(), row, row + 1);
+    beginRemoveRows(QModelIndex(), row, row);
    records.erase(records.begin() + row);
    if (state == State::syncronized)    //give a second thought
        state = State::initial;
@ -68,7 +68,7 @@ int Models::Assets::rowCount (const QModelIndex& parent) const {

 QHash<int, QByteArray> Models::Assets::roleNames () const {
    static const QHash<int, QByteArray> roleNames{
-        {Title, "title"}, {Icon, "icon"}, {Balance, "balance"}, {Archived, "archived"}
+        {Title, "title"}, {Icon, "icon"}, {Balance, "balance"}, {Archived, "archived"}, {Color, "color"}
    };
    return roleNames;
 }
@ -101,6 +101,8 @@ QVariant Models::Assets::data (const QModelIndex& index, int role) const {
                return records[row].balance;
            case Archived:
                return records[row].archived;
+            case Color:
+                return records[row].color;
        }
    }

@ -118,6 +120,10 @@ bool Models::Assets::deserialize (const QVariantList& from, std::deque<Asset>& o
        asset.icon = ser.value("icon").toString();
        asset.archived = ser.value("archived").toBool();
        asset.id = ser.value("id").toUInt();
+
+        uint32_t color = ser.value("color").toUInt();
+        uint8_t* rgba = reinterpret_cast<uint8_t*>(&color);
+        asset.color = QColor::fromRgb(rgba[0], rgba[1], rgba[2], rgba[3]);
    }

    return true;
@ -135,5 +141,6 @@ QModelIndex Models::Assets::getIndex (unsigned int id) const {
        if (records[i].id == id)
            return createIndex(i, 0, &records[i]);
    }
+
    return QModelIndex();
 }
--- a/API/models/assets.h
+++ b/API/models/assets.h
@ -6,6 +6,7 @@
 #include <deque>

 #include <QString>
+#include <QColor>
 #include <QAbstractListModel>
 #include <qqmlregistration.h>

@ -14,6 +15,7 @@ struct Asset {
    unsigned int id;
    QString title;
    QString icon;
+    QColor color;
    double balance;
    bool archived;
    unsigned int currency;
@ -22,7 +24,6 @@ struct Asset {
 class Assets : public QAbstractListModel {
    Q_OBJECT
    QML_ELEMENT
-    QML_SINGLETON

 public:
    explicit Assets (QObject* parent = nullptr);
@ -31,7 +32,8 @@ public:
        Title = Qt::UserRole + 1,
        Icon,
        Balance,
-        Archived
+        Archived,
+        Color
    };

    void clear();
--- a/models/magpie.cpp
+++ b/models/magpie.cpp
@ -0,0 +1,200 @@
+//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "magpie.h"
+
+#include <QDebug>
+
+#include "API/api.h"
+#include "API/helpers.h"
+#include "API/codes.h"
+
+Models::Magpie::Magpie (QObject* parent):
+    QObject(parent),
+    assets(),
+    address(),
+    state(State::Offline),
+    accessToken(),
+    renewToken(),
+    api(),
+    firstPoll(),
+    pollRequestId(API::none)
+{
+    firstPoll.setSingleShot(true);
+    firstPoll.setInterval(2000);
+    connect(&firstPoll, &QTimer::timeout, this, &Magpie::onFirstPollTimerSuccess);
+    connect(&assets, &Assets::requestAssets, this, &Magpie::requestAssets);
+}
+
+QUrl Models::Magpie::getAddress () const {
+    return address;
+}
+
+Models::Magpie::State Models::Magpie::getState () const {
+    return state;
+}
+
+QString Models::Magpie::getAccessToken () const {
+    return accessToken;
+}
+
+QString Models::Magpie::getRenewToken () const {
+    return renewToken;
+}
+
+void Models::Magpie::installAPI (const std::shared_ptr<API>& api) {
+    Magpie::api = api;
+}
+
+void Models::Magpie::setAddress (const QUrl& address) {
+    if (Magpie::address == address)
+        return;
+
+    if (state == Authenticated) {
+        //do something
+    }
+
+    Magpie::address = address;
+    emit addressChanged(address);
+    if (address.isEmpty())
+        setState(NoServer);
+    else
+        setState(NotAuthenticated);
+}
+
+void Models::Magpie::forceAddress (const QUrl& address) {
+    Magpie::address = "";
+    setAddress(address);
+}
+
+void Models::Magpie::setTokens (const QString access, const QString& renew, bool notify) {
+    accessToken = access;
+    renewToken = renew;
+    setState(Authenticating);
+    startPolling();
+
+    if (notify)
+        emit storeTokens(accessToken, renewToken);
+}
+
+void Models::Magpie::setState (State newState) {
+    if (newState == state)
+        return;
+
+    state = newState;
+    emit stateChanged(state);
+}
+
+Models::Assets* Models::Magpie::getAssets () {
+    return &assets;
+}
+
+void Models::Magpie::requestAssets () {
+    api->requestAssets(
+        [this] (const QVariantList& list) {
+            std::deque<Asset> result;
+            bool res = Assets::deserialize(list, result);
+            if (!res) {
+                qDebug() << "Error deserializer received assets";
+                result.clear();
+            } else {
+                qDebug() << "Assets successfully received";
+            }
+
+            assets.addAssets(result);
+        },
+        [this] (const QString& error, const std::optional<QVariantMap>& data) {
+            assets.addAssets({});
+        }
+    );
+}
+
+void Models::Magpie::onFirstPollTimerSuccess () {
+    setState(Authenticated);
+}
+
+void Models::Magpie::startPolling () {
+    qDebug() << "Starting polling...";
+    if (state != Authenticating)
+        throw std::runtime_error("Can not start polling in this state: " + std::to_string(state));
+
+    sendPoll();
+    firstPoll.start();
+}
+
+void Models::Magpie::sendPoll (bool clear) {
+    if (pollRequestId != API::none)
+        throw std::runtime_error("an attempt to send second poll request while the other one is active");
+
+    pollRequestId = api->poll(
+        std::bind(&Magpie::onPollSuccess, this, std::placeholders::_1),
+        std::bind(&Magpie::onPollError, this, std::placeholders::_1, std::placeholders::_2),
+        clear
+    );
+}
+
+void Models::Magpie::onPollSuccess (const QVariantMap& data) {
+    pollRequestId = API::none;
+    firstPoll.stop();
+
+    Codes::Poll code = Codes::convertPoll(data.value("result").toInt());
+    bool clear = false;
+    switch (code) {
+        case Codes::Poll::success:
+            clear = handleChanges(qast<QVariantMap>(data.value("data")));
+        //todo handle the result
+        case Codes::Poll::timeout:
+            setState(Authenticated);
+            return sendPoll(clear);
+        case Codes::Poll::tokenProblem:
+        case Codes::Poll::replace:
+        case Codes::Poll::unknownError: //todo this one doesn't actually mean that we can't work for now, the network may be temporarily down or something
+            return setState(NotAuthenticated);
+    }
+}
+
+void Models::Magpie::onPollError (const QString& err, const std::optional<QVariantMap>& data) {
+    qDebug() << "Poll error:" << err;
+    pollRequestId = API::none;
+    firstPoll.stop();
+    setState(NotAuthenticated);
+}
+
+bool Models::Magpie::handleChanges (const QVariantMap& changes) {
+    QVariantMap::ConstIterator itr = changes.constFind("system");
+    if (itr != changes.constEnd() && itr.value().canConvert<QVariantMap>()) {
+        const QVariantMap& sys = qast<QVariantMap>(itr.value());
+        QVariantMap::ConstIterator invItr = sys.constFind("invalidate");
+        if (invItr != sys.constEnd()) {
+            const QVariant& vinv = invItr.value();
+            if (vinv.canConvert<bool>() && vinv.toBool())
+                resetAllModels();
+        }
+    }
+
+    itr = changes.constFind("assets");
+    if (itr != changes.constEnd() && itr.value().canConvert<QVariantMap>()) {
+        const QVariantMap& assets = qast<QVariantMap>(itr.value());
+        QVariantMap::ConstIterator aItr = assets.constFind("invalidate");
+        if (aItr != assets.constEnd()) {
+            const QVariant& vinv = aItr.value();
+            if (vinv.canConvert<bool>() && vinv.toBool())
+                Magpie::assets.clear();
+        }
+
+        aItr = assets.constFind("added");
+        if (aItr != assets.constEnd() && aItr.value().canConvert<QVariantList>()) {
+            std::deque<Models::Asset> added;
+            if (!Models::Assets::deserialize(qast<QVariantList>(aItr.value()), added))
+                qDebug() << "Error deserializng added assets";
+            else
+                Magpie::assets.addAssets(added);
+        }
+    }
+
+    return true;
+}
+
+void Models::Magpie::resetAllModels () {
+    assets.clear();
+}
--- a/models/magpie.h
+++ b/models/magpie.h
@ -0,0 +1,81 @@
+//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
+//SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <memory.h>
+
+#include <QObject>
+#include <QQmlEngine>
+#include <QTimer>
+
+#include "assets.h"
+
+class API;
+namespace Models {
+
+class Magpie : public QObject {
+    Q_OBJECT
+    QML_ELEMENT
+    QML_SINGLETON
+
+public:
+    enum State {
+        Offline,
+        NoServer,
+        NotAuthenticated,
+        Authenticating,
+        Authenticated
+    };
+    Q_ENUM(State)
+
+    Q_PROPERTY(QUrl address READ getAddress NOTIFY addressChanged)
+    Q_PROPERTY(State state READ getState NOTIFY stateChanged)
+    Q_PROPERTY(Assets* assets READ getAssets CONSTANT)
+
+    explicit Magpie(QObject *parent = nullptr);
+
+    QUrl getAddress() const;
+    State getState() const;
+    QString getAccessToken() const;
+    QString getRenewToken() const;
+
+    void installAPI(const std::shared_ptr<API>& api);
+    void setAddress(const QUrl& address);
+    void forceAddress(const QUrl& address);
+    void setTokens(const QString access, const QString& renew, bool notify = false);
+    void setState(State newState);
+    Assets* getAssets();
+
+signals:
+    void addressChanged(const QUrl& path);
+    void stateChanged(State state);
+
+    void storeTokens(const QString& access, const QString& renew);
+
+public:
+    Assets assets;
+
+private slots:
+    void requestAssets();
+    void onFirstPollTimerSuccess();
+
+private:
+    void startPolling();
+    void sendPoll(bool clear = false);
+    void onPollSuccess(const QVariantMap& data);
+    void onPollError(const QString& err, const std::optional<QVariantMap>& data);
+    bool handleChanges(const QVariantMap& changes);
+    void resetAllModels();
+
+private:
+    QUrl address;
+    State state;
+    QString accessToken;
+    QString renewToken;
+    std::shared_ptr<API> api;
+    QTimer firstPoll;
+    unsigned int pollRequestId;
+};
+
+}
--- a/qml/Application/Assets.qml
+++ b/qml/Application/Assets.qml
@ -5,7 +5,7 @@ import QtQuick
 import QtQuick.Controls
 import QtQuick.Layouts

-import magpie.Models as Models
+import magpie
 import magpie.Components as Components

 Item {
@ -28,9 +28,11 @@ Item {
            id: listView
            Layout.fillHeight: true
            Layout.fillWidth: true
-            model: Models.Assets
+            model: Magpie.assets
+            spacing: 5
            delegate: Components.AssetLine {
                height: 20
+                width: listView.width
            }
        }
    }
--- a/qml/Components/AssetLine.qml
+++ b/qml/Components/AssetLine.qml
@ -4,23 +4,50 @@
 import QtQuick
 import QtQuick.Controls

-Rectangle {
+Item {
    id: line
    required property string title
    required property string icon
+    required property color color
+    required property string balance

    Row {
+        readonly property int iconSize: height
+        readonly property int freespace: width - iconSize - spacing * children.length - 1
+
        anchors.fill: parent
+        spacing: 5
+
+        Rectangle {
+            width: parent.iconSize
+            height: parent.iconSize
+            color: line.color
+
            IconLabel {
-            anchors.verticalCenter: parent.verticalCenter
-            icon.name: line.icon
-            width: parent.height
-            height: parent.height
+                anchors.fill: parent
+                icon {
+                    name: line.icon
+                    width: width
+                    height: height
+                }
+            }
        }

        Text {
-            anchors.verticalCenter: parent.verticalCenter
+            width: parent.freespace / 2
+            height: parent.height
            text: title
+            verticalAlignment: Text.AlignVCenter
+            color: palette.text
+            font.bold: true
+        }
+
+        Text {
+            width: parent.freespace / 2
+            height: parent.height
+            text: balance
+            verticalAlignment: Text.AlignVCenter
+            color: palette.text
        }
    }
 }
--- a/qml/Forms/AddAsset.qml
+++ b/qml/Forms/AddAsset.qml
@ -4,7 +4,7 @@
 import QtQuick
 import QtQuick.Controls

-import magpie.API
+import magpie
 import magpie.Components as Components

 Item {
--- a/qml/Forms/Login.qml
+++ b/qml/Forms/Login.qml
@ -4,7 +4,7 @@
 import QtQuick
 import QtQuick.Controls

-import magpie.API
+import magpie
 import magpie.Components as Components

 Column {
--- a/qml/Forms/Register.qml
+++ b/qml/Forms/Register.qml
@ -4,7 +4,7 @@
 import QtQuick
 import QtQuick.Controls

-import magpie.API
+import magpie
 import magpie.Components as Components

 Column {
--- a/qml/ServerPick.qml
+++ b/qml/ServerPick.qml
@ -5,7 +5,7 @@ import QtQuick
 import QtQuick.Controls
 import QtQuick.Layouts

-import magpie.API
+import magpie
 import magpie.Components as Components

 Page {
--- a/qml/Welcome.qml
+++ b/qml/Welcome.qml
@ -5,7 +5,7 @@ import QtQuick
 import QtQuick.Controls
 import QtQuick.Layouts

-import magpie.API
+import magpie
 import magpie.Forms as Forms
 import magpie.Components as Components

@ -44,7 +44,7 @@ Page {
            }
            Label {
                horizontalAlignment: Label.AlignLeft
-                text: API.state === API.NoServer ? qsTr("choose") : API.address
+                text: Magpie.state === Magpie.NoServer ? qsTr("choose") : Magpie.address
                font {
                    italic: true
                    underline: true
@ -52,20 +52,20 @@ Page {

                MouseArea {
                    anchors.fill: parent
-                    onClicked: pickServer(API.address)
+                    onClicked: pickServer(Magpie.address)
                }
            }
        }

        Components.Modal {
-            inProgress: API.state === API.Authenticating
-            visible: !priv.loggingIn && API.state === API.Authenticating
-            closable: API.state === API.NotAuthenticated
-            status: "Logging into " + API.address + "..."
+            inProgress: Magpie.state === Magpie.Authenticating
+            visible: !priv.loggingIn && Magpie.state === Magpie.Authenticating
+            closable: Magpie.state === Magpie.NotAuthenticated
+            status: "Logging into " + Magpie.address + "..."
        }

        Item {
-            visible: priv.loggingIn || API.state === API.NotAuthenticated || API.state === API.Authenticating
+            visible: priv.loggingIn || Magpie.state === Magpie.NotAuthenticated || Magpie.state === Magpie.Authenticating

            width: page.width
            height: stack.currentItem ? stack.currentItem.implicitHeight: 0
--- a/qml/main.qml
+++ b/qml/main.qml
@ -7,7 +7,7 @@ import QtQuick.Controls
 import QtQuick.Layouts
 import QtCore

-import magpie.API
+import magpie
 import magpie.Application as Application

 ApplicationWindow {
@ -35,7 +35,7 @@ ApplicationWindow {
        Component {
            id: serverPick
            ServerPick {
-                address: API.address
+                address: Magpie.address
                onBack: stack.pop()
                StackView.onActivating: pickingServer = true;
                StackView.onDeactivating: pickingServer = false;
@ -52,15 +52,15 @@ ApplicationWindow {
    }

    Connections {
-        target: API
+        target: Magpie
        function onAddressChanged (url) {
            if (pickingServer && url.toString().length > 0)
                stack.pop()
        }
        function onStateChanged (state) {
-            if (state === API.Authenticated)
+            if (state === Magpie.Authenticated)
                stack.push(app);
-            else if (runningApp && state === API.NotAuthenticated)
+            else if (runningApp && state === Magpie.NotAuthenticated)
                stack.pop();
        }
    }
--- a/root.cpp
+++ b/root.cpp
@ -10,7 +10,8 @@ Root::Root(const QUrl& root, int& argc, char* argv[]) :
    root(root),
    engine(),
    context(engine.rootContext()),
-    api()
+    magpie(),
+    api(std::make_shared<API>(magpie))
 {
    std::cout << "Starting Magpie..." << std::endl;

@ -21,26 +22,26 @@ Root::Root(const QUrl& root, int& argc, char* argv[]) :
    setApplicationVersion("0.0.1");
    setDesktopFileName("magpie");

+    magpie.installAPI(api);
+
    connect(&engine, &QQmlApplicationEngine::objectCreated,
        this, &Root::onObjectCreated,
        Qt::QueuedConnection
    );

    QSettings settings;
-    api.setAddress(settings.value("address").toUrl());
+    magpie.setAddress(settings.value("address").toUrl());

    QString acc = settings.value("accessToken").toString();
    QString ren = settings.value("renewToken").toString();
    if (!acc.isEmpty() && !ren.isEmpty())
-        api.setTokens(acc, ren);
+        magpie.setTokens(acc, ren);

-    qRegisterMetaType<API>("API");
-    connect(&api, &API::addressChanged, this, &Root::onAPIAddressChanged);
-    connect(&api, &API::storeTokens, this, &Root::onStoreTokens);
+    connect(&magpie, &Models::Magpie::addressChanged, this, &Root::onAPIAddressChanged);
+    connect(&magpie, &Models::Magpie::storeTokens, this, &Root::onStoreTokens);

-    qmlRegisterSingletonInstance("magpie.API", 1, 0, "API", &api);
-
-    qmlRegisterSingletonInstance("magpie.Models", 1, 0, "Assets", &api.assets);
+    qmlRegisterSingletonInstance("magpie", 1, 0, "API", api.get());
+    qmlRegisterSingletonInstance("magpie", 1, 0, "Magpie", &magpie);

    engine.addImportPath(":/");
    engine.load(root);
@ -64,7 +65,7 @@ bool Root::notify(QObject* receiver, QEvent* e) {
    }

    std::cout << "Magpie is quiting..." << std::endl;
-    exit(1);
+    exit(-1);
    return false;
 }

--- a/root.h
+++ b/root.h
@ -5,6 +5,7 @@

 #include <iostream>
 #include <stdexcept>
+#include <memory>

 #include <QString>
 #include <QUrl>
@ -12,6 +13,7 @@
 #include <QQmlApplicationEngine>
 #include <QQmlContext>

+#include "models/magpie.h"
 #include "API/api.h"

 class Root : public QGuiApplication {
@ -30,5 +32,7 @@ private:
    QUrl root;
    QQmlApplicationEngine engine;
    QQmlContext* context;
-    API api;
+    Models::Magpie magpie;
+    std::shared_ptr<API> api;
+
 };