/* 
 * 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 "OllamaProvider.hpp"

#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QNetworkReply>
#include <QtCore/qeventloop.h>

#include "OllamaMessage.hpp"
#include "logger/Logger.hpp"
#include "settings/ChatAssistantSettings.hpp"
#include "settings/CodeCompletionSettings.hpp"

namespace QodeAssist::Providers {

OllamaProvider::OllamaProvider() {}

QString OllamaProvider::name() const
{
    return "Ollama";
}

QString OllamaProvider::url() const
{
    return "http://localhost:11434";
}

QString OllamaProvider::completionEndpoint() const
{
    return "/api/generate";
}

QString OllamaProvider::chatEndpoint() const
{
    return "/api/chat";
}

bool OllamaProvider::supportsModelListing() const
{
    return true;
}

void OllamaProvider::prepareRequest(QJsonObject &request, LLMCore::RequestType type)
{
    auto applySettings = [&request](const auto &settings) {
        QJsonObject options;
        options["num_predict"] = settings.maxTokens();
        options["temperature"] = settings.temperature();

        if (settings.useTopP())
            options["top_p"] = settings.topP();
        if (settings.useTopK())
            options["top_k"] = settings.topK();
        if (settings.useFrequencyPenalty())
            options["frequency_penalty"] = settings.frequencyPenalty();
        if (settings.usePresencePenalty())
            options["presence_penalty"] = settings.presencePenalty();

        request["options"] = options;
        request["keep_alive"] = settings.ollamaLivetime();
    };

    if (type == LLMCore::RequestType::Fim) {
        applySettings(Settings::codeCompletionSettings());
    } else {
        applySettings(Settings::chatAssistantSettings());
    }
}

bool OllamaProvider::handleResponse(QNetworkReply *reply, QString &accumulatedResponse)
{
    const QString endpoint = reply->url().path();
    auto messageType = endpoint == completionEndpoint() ? OllamaMessage::Type::Generate
                                                        : OllamaMessage::Type::Chat;

    auto processMessage =
        [&accumulatedResponse](const QJsonDocument &doc, OllamaMessage::Type messageType) {
            if (doc.isNull()) {
                LOG_MESSAGE("Invalid JSON response from Ollama");
                return false;
            }

            auto message = OllamaMessage::fromJson(doc.object(), messageType);
            if (message.hasError()) {
                LOG_MESSAGE("Error in Ollama response: " + message.error);
                return false;
            }

            accumulatedResponse += message.getContent();
            return message.done;
        };

    if (reply->canReadLine()) {
        while (reply->canReadLine()) {
            QByteArray line = reply->readLine().trimmed();
            if (line.isEmpty())
                continue;

            if (processMessage(QJsonDocument::fromJson(line), messageType)) {
                return true;
            }
        }
        return false;
    } else {
        return processMessage(QJsonDocument::fromJson(reply->readAll()), messageType);
    }
}

QList<QString> OllamaProvider::getInstalledModels(const QString &url)
{
    QList<QString> models;
    QNetworkAccessManager manager;
    QNetworkRequest request(QString("%1%2").arg(url, "/api/tags"));
    QNetworkReply *reply = manager.get(request);

    QEventLoop loop;
    QObject::connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
    loop.exec();

    if (reply->error() == QNetworkReply::NoError) {
        QByteArray responseData = reply->readAll();
        QJsonDocument jsonResponse = QJsonDocument::fromJson(responseData);
        QJsonObject jsonObject = jsonResponse.object();
        QJsonArray modelArray = jsonObject["models"].toArray();

        for (const QJsonValue &value : modelArray) {
            QJsonObject modelObject = value.toObject();
            QString modelName = modelObject["name"].toString();
            models.append(modelName);
        }
    } else {
        LOG_MESSAGE(QString("Error fetching models: %1").arg(reply->errorString()));
    }

    reply->deleteLater();
    return models;
}

} // namespace QodeAssist::Providers