feat: Add saving and loading chat history

* feat: Add chat history path
* feat: Add save and load chat
* fix: Change badge width calculation
* refactor: Move chat action to top
* feat: Add autosave of messageReceived
* feat: Add settings for autosave

ChatView/ChatSerializer.cpp

@@ -0,0 +1,145 @@
+/* 
+ * Copyright (C) 2024 Petr Mironychev
+ *
+ * This file is part of QodeAssist.
+ *
+ * QodeAssist is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * QodeAssist 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with QodeAssist. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "ChatSerializer.hpp"
+#include "Logger.hpp"
+
+#include <QDir>
+#include <QFile>
+#include <QFileInfo>
+#include <QJsonDocument>
+
+namespace QodeAssist::Chat {
+
+const QString ChatSerializer::VERSION = "0.1";
+
+SerializationResult ChatSerializer::saveToFile(const ChatModel *model, const QString &filePath)
+{
+    if (!ensureDirectoryExists(filePath)) {
+        return {false, "Failed to create directory structure"};
+    }
+
+    QFile file(filePath);
+    if (!file.open(QIODevice::WriteOnly)) {
+        return {false, QString("Failed to open file for writing: %1").arg(filePath)};
+    }
+
+    QJsonObject root = serializeChat(model);
+    QJsonDocument doc(root);
+
+    if (file.write(doc.toJson(QJsonDocument::Indented)) == -1) {
+        return {false, QString("Failed to write to file: %1").arg(file.errorString())};
+    }
+
+    return {true, QString()};
+}
+
+SerializationResult ChatSerializer::loadFromFile(ChatModel *model, const QString &filePath)
+{
+    QFile file(filePath);
+    if (!file.open(QIODevice::ReadOnly)) {
+        return {false, QString("Failed to open file for reading: %1").arg(filePath)};
+    }
+
+    QJsonParseError error;
+    QJsonDocument doc = QJsonDocument::fromJson(file.readAll(), &error);
+    if (error.error != QJsonParseError::NoError) {
+        return {false, QString("JSON parse error: %1").arg(error.errorString())};
+    }
+
+    QJsonObject root = doc.object();
+    QString version = root["version"].toString();
+
+    if (!validateVersion(version)) {
+        return {false, QString("Unsupported version: %1").arg(version)};
+    }
+
+    if (!deserializeChat(model, root)) {
+        return {false, "Failed to deserialize chat data"};
+    }
+
+    return {true, QString()};
+}
+
+QJsonObject ChatSerializer::serializeMessage(const ChatModel::Message &message)
+{
+    QJsonObject messageObj;
+    messageObj["role"] = static_cast<int>(message.role);
+    messageObj["content"] = message.content;
+    messageObj["tokenCount"] = message.tokenCount;
+    messageObj["id"] = message.id;
+    return messageObj;
+}
+
+ChatModel::Message ChatSerializer::deserializeMessage(const QJsonObject &json)
+{
+    ChatModel::Message message;
+    message.role = static_cast<ChatModel::ChatRole>(json["role"].toInt());
+    message.content = json["content"].toString();
+    message.tokenCount = json["tokenCount"].toInt();
+    message.id = json["id"].toString();
+    return message;
+}
+
+QJsonObject ChatSerializer::serializeChat(const ChatModel *model)
+{
+    QJsonArray messagesArray;
+    for (const auto &message : model->getChatHistory()) {
+        messagesArray.append(serializeMessage(message));
+    }
+
+    QJsonObject root;
+    root["version"] = VERSION;
+    root["messages"] = messagesArray;
+    root["totalTokens"] = model->totalTokens();
+
+    return root;
+}
+
+bool ChatSerializer::deserializeChat(ChatModel *model, const QJsonObject &json)
+{
+    QJsonArray messagesArray = json["messages"].toArray();
+    QVector<ChatModel::Message> messages;
+    messages.reserve(messagesArray.size());
+
+    for (const auto &messageValue : messagesArray) {
+        messages.append(deserializeMessage(messageValue.toObject()));
+    }
+
+    model->clear();
+    for (const auto &message : messages) {
+        model->addMessage(message.content, message.role, message.id);
+    }
+
+    return true;
+}
+
+bool ChatSerializer::ensureDirectoryExists(const QString &filePath)
+{
+    QFileInfo fileInfo(filePath);
+    QDir dir = fileInfo.dir();
+    return dir.exists() || dir.mkpath(".");
+}
+
+bool ChatSerializer::validateVersion(const QString &version)
+{
+    return version == VERSION;
+}
+
+} // namespace QodeAssist::Chat