WIP: polymorphic ChatItem replacement

gpt4all-chat/src/message_content.cpp

@@ -0,0 +1,141 @@
+#include <QString>
+#include <QDataStream>
+#include <QtGlobal>
+
+#include <fmt/format.h>
+
+#define THROW_IF_BAD(stream)                                                        \
+    do {                                                                            \
+        if (auto status = (stream).status(); status != QDataStream::Status::OK)     \
+            throw std::runtime_error(fmt::format("bad stream status: {}", status)); \
+    } while (0)                                                                     \
+
+inline namespace MessageEnums {
+    Q_NAMESPACE
+    // for DataLake
+    enum class MessageRating : quint8 { Unrated = 0, Positive = 1, Negative = 2, Max = Negative };
+    Q_ENUM_NS(MessageRating)
+}
+
+// TODO(Adam): Maybe we should include the model name here as well as timestamp?
+class MessageContent {
+    Q_GADGET
+    Q_PROPERTY(QString role    READ   role    CONSTANT)
+    Q_PROPERTY(QString content MEMBER content)
+
+protected:
+    enum class Type : quint8 { Prompt = 0, Response = 1, Max = Response };
+
+public:
+    virtual QString role() const = 0;
+
+    friend auto deserialize(QDataStream &stream, ChatModel *model) -> std::unique_ptr<MessageContent>
+    {
+        union { quint8 u8; };
+        THROW_IF_BAD(stream);
+
+        stream >> u8; // version
+        THROW_IF_BAD(stream);
+        if (u8 > VERSION)
+            throw std::invalid_argument(fmt::format("unknown version: {}", u8));
+
+        stream >> u8; // type
+        THROW_IF_BAD(stream);
+        if (u8 > Type::Max)
+            throw std::invalid_argument(fmt::format("unknown type: {}", u8));
+        auto type = Type(u8);
+
+        std::unique_ptr<MessageContent> result;
+        switch (type) {
+            case Prompt:   result = std::make_unique<PromptContent>  ();      break;
+            case Response: result = std::make_unique<ResponseContent>(model); break;
+        }
+
+        stream >> result->content;
+        THROW_IF_BAD(stream);
+        // TODO: add more common fields as needed
+
+        result->deserializeInternal(stream, version);
+        return result;
+    }
+
+protected:
+    virtual void deserializeInternal(QDataStream &stream, quint32 version) = 0;
+
+public:
+    QString content;
+
+private:
+    static quint8 VERSION = 0;
+};
+Q_DECLARE_METATYPE(MessageContent)
+
+class PromptContent final : public MessageContent {
+    Q_GADGET
+    Q_PROPERTY(QList<ResultInfo>       sources               MEMBER sources)
+    Q_PROPERTY(QList<ResultInfo>       consolidatedSources   MEMBER consolidatedSources)
+    Q_PROPERTY(QList<PromptAttachment> promptAttachments     MEMBER promptAttachments)
+    Q_PROPERTY(QString                 promptPlusAttachments READ   promptPlusAttachments)
+
+public:
+    QString role() const override { return u"user"_s; }
+
+    QString promptPlusAttachments() const
+    {
+        if (!promptAttachments.isEmpty()) {
+            QStringList items;
+            for (auto &attached : std::as_const(promptAttachments))
+                items << attached.processedContent();
+            items << content;
+            return items.join("\n\n");
+        }
+        return content;
+    }
+
+protected:
+    void deserializeInternal(QDataStream &stream, quint32 version) override
+    {
+        Q_UNUSED(version); // only v0 exists currently
+        // TODO: ...
+    }
+};
+Q_DECLARE_METATYPE(PromptContent)
+
+class ResponseContent final : public MessageContent {
+    Q_GADGET
+    Q_PROPERTY(QString newResponse MEMBER newResponse) // for DataLake
+    Q_PROPERTY(bool currentResponse READ currentResponse)
+    Q_PROPERTY(bool stopped MEMBER stopped) // for DataLake
+    Q_PROPERTY(MessageRating rating MEMBER rating) // for DataLake
+
+public:
+    explicit ResponseContent(ChatModel *model)
+        : m_model(model) {}
+
+    QString role() const override { return u"assistant"_s; }
+    bool currentResponse() const { return this == m_model->currentResponse(); }
+
+protected:
+    void deserializeInternal(QDataStream &stream, quint32 version) override
+    {
+        Q_UNUSED(version); // only v0 exists currently
+
+        stream >> newResponse;
+        THROW_IF_BAD(stream);
+
+        stream >> stopped;
+        THROW_IF_BAD(stream);
+
+        stream >> rating;
+        THROW_IF_BAD(stream);
+    }
+
+public:
+    QString newResponse;
+    bool stopped = false;
+    MessageRating rating = MessageRating::Unrated;
+
+private:
+    ChatModel *m_model;
+};
+Q_DECLARE_METATYPE(ResponseContent)