/*
 * 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 "ChatRootView.hpp"

#include <QClipboard>
#include <QFileDialog>
#include <QMessageBox>

#include <coreplugin/icore.h>
#include <projectexplorer/project.h>
#include <projectexplorer/projectexplorer.h>
#include <projectexplorer/projectmanager.h>
#include <utils/theme/theme.h>
#include <utils/utilsicons.h>

#include "ChatAssistantSettings.hpp"
#include "ChatSerializer.hpp"
#include "GeneralSettings.hpp"
#include "Logger.hpp"
#include "ProjectSettings.hpp"

namespace QodeAssist::Chat {

ChatRootView::ChatRootView(QQuickItem *parent)
    : QQuickItem(parent)
    , m_chatModel(new ChatModel(this))
    , m_clientInterface(new ClientInterface(m_chatModel, this))
{
    auto &settings = Settings::generalSettings();

    connect(&settings.caModel,
            &Utils::BaseAspect::changed,
            this,
            &ChatRootView::currentTemplateChanged);

    connect(&Settings::chatAssistantSettings().sharingCurrentFile,
            &Utils::BaseAspect::changed,
            this,
            &ChatRootView::isSharingCurrentFileChanged);

    connect(
        m_clientInterface,
        &ClientInterface::messageReceivedCompletely,
        this,
        &ChatRootView::autosave);

    connect(m_chatModel, &ChatModel::modelReseted, [this]() { m_recentFilePath = QString(); });

    generateColors();
}

ChatModel *ChatRootView::chatModel() const
{
    return m_chatModel;
}

QColor ChatRootView::backgroundColor() const
{
    return Utils::creatorColor(Utils::Theme::BackgroundColorNormal);
}

void ChatRootView::sendMessage(const QString &message, bool sharingCurrentFile)
{
    if (m_chatModel->totalTokens() > m_chatModel->tokensThreshold()) {
        QMessageBox::StandardButton reply = QMessageBox::question(
            Core::ICore::dialogParent(),
            tr("Token Limit Exceeded"),
            tr("The chat history has exceeded the token limit.\n"
               "Would you like to create new chat?"),
            QMessageBox::Yes | QMessageBox::No);

        if (reply == QMessageBox::Yes) {
            autosave();
            m_chatModel->clear();
            m_recentFilePath = QString{};
            return;
        }
    }

    m_clientInterface->sendMessage(message, m_attachmentFiles, sharingCurrentFile);
    clearAttachmentFiles();
}

void ChatRootView::copyToClipboard(const QString &text)
{
    QGuiApplication::clipboard()->setText(text);
}

void ChatRootView::cancelRequest()
{
    m_clientInterface->cancelRequest();
}

void ChatRootView::clearAttachmentFiles()
{
    if (!m_attachmentFiles.isEmpty()) {
        m_attachmentFiles.clear();
        emit attachmentFilesChanged();
    }
}

void ChatRootView::generateColors()
{
    QColor baseColor = backgroundColor();
    bool isDarkTheme = baseColor.lightness() < 128;

    if (isDarkTheme) {
        m_primaryColor = generateColor(baseColor, 0.1, 1.2, 1.4);
        m_secondaryColor = generateColor(baseColor, -0.1, 1.1, 1.2);
        m_codeColor = generateColor(baseColor, 0.05, 0.8, 1.1);
    } else {
        m_primaryColor = generateColor(baseColor, 0.05, 1.05, 1.1);
        m_secondaryColor = generateColor(baseColor, -0.05, 1.1, 1.2);
        m_codeColor = generateColor(baseColor, 0.02, 0.95, 1.05);
    }
}

QColor ChatRootView::generateColor(const QColor &baseColor,
                                   float hueShift,
                                   float saturationMod,
                                   float lightnessMod)
{
    float h, s, l, a;
    baseColor.getHslF(&h, &s, &l, &a);
    bool isDarkTheme = l < 0.5;

    h = fmod(h + hueShift + 1.0, 1.0);

    s = qBound(0.0f, s * saturationMod, 1.0f);

    if (isDarkTheme) {
        l = qBound(0.0f, l * lightnessMod, 1.0f);
    } else {
        l = qBound(0.0f, l / lightnessMod, 1.0f);
    }

    h = qBound(0.0f, h, 1.0f);
    s = qBound(0.0f, s, 1.0f);
    l = qBound(0.0f, l, 1.0f);
    a = qBound(0.0f, a, 1.0f);

    return QColor::fromHslF(h, s, l, a);
}

QString ChatRootView::getChatsHistoryDir() const
{
    QString path;

    if (auto project = ProjectExplorer::ProjectManager::startupProject()) {
        Settings::ProjectSettings projectSettings(project);
        path = projectSettings.chatHistoryPath().toString();
    } else {
        path = QString("%1/qodeassist/chat_history").arg(Core::ICore::userResourcePath().toString());
    }

    QDir dir(path);
    if (!dir.exists() && !dir.mkpath(".")) {
        LOG_MESSAGE(QString("Failed to create directory: %1").arg(path));
        return QString();
    }

    return path;
}

QString ChatRootView::currentTemplate() const
{
    auto &settings = Settings::generalSettings();
    return settings.caModel();
}

QColor ChatRootView::primaryColor() const
{
    return m_primaryColor;
}

QColor ChatRootView::secondaryColor() const
{
    return m_secondaryColor;
}

QColor ChatRootView::codeColor() const
{
    return m_codeColor;
}

bool ChatRootView::isSharingCurrentFile() const
{
    return Settings::chatAssistantSettings().sharingCurrentFile();
}

void ChatRootView::saveHistory(const QString &filePath)
{
    auto result = ChatSerializer::saveToFile(m_chatModel, filePath);
    if (!result.success) {
        LOG_MESSAGE(QString("Failed to save chat history: %1").arg(result.errorMessage));
    }
}

void ChatRootView::loadHistory(const QString &filePath)
{
    auto result = ChatSerializer::loadFromFile(m_chatModel, filePath);
    if (!result.success) {
        LOG_MESSAGE(QString("Failed to load chat history: %1").arg(result.errorMessage));
    } else {
        m_recentFilePath = filePath;
    }
}

void ChatRootView::showSaveDialog()
{
    QString initialDir = getChatsHistoryDir();

    QFileDialog *dialog = new QFileDialog(nullptr, tr("Save Chat History"));
    dialog->setAcceptMode(QFileDialog::AcceptSave);
    dialog->setFileMode(QFileDialog::AnyFile);
    dialog->setNameFilter(tr("JSON files (*.json)"));
    dialog->setDefaultSuffix("json");
    if (!initialDir.isEmpty()) {
        dialog->setDirectory(initialDir);
        dialog->selectFile(getSuggestedFileName() + ".json");
    }

    connect(dialog, &QFileDialog::finished, this, [this, dialog](int result) {
        if (result == QFileDialog::Accepted) {
            QStringList files = dialog->selectedFiles();
            if (!files.isEmpty()) {
                saveHistory(files.first());
            }
        }
        dialog->deleteLater();
    });

    dialog->open();
}

void ChatRootView::showLoadDialog()
{
    QString initialDir = getChatsHistoryDir();

    QFileDialog *dialog = new QFileDialog(nullptr, tr("Load Chat History"));
    dialog->setAcceptMode(QFileDialog::AcceptOpen);
    dialog->setFileMode(QFileDialog::ExistingFile);
    dialog->setNameFilter(tr("JSON files (*.json)"));
    if (!initialDir.isEmpty()) {
        dialog->setDirectory(initialDir);
    }

    connect(dialog, &QFileDialog::finished, this, [this, dialog](int result) {
        if (result == QFileDialog::Accepted) {
            QStringList files = dialog->selectedFiles();
            if (!files.isEmpty()) {
                loadHistory(files.first());
            }
        }
        dialog->deleteLater();
    });

    dialog->open();
}

QString ChatRootView::getSuggestedFileName() const
{
    QStringList parts;

    if (m_chatModel->rowCount() > 0) {
        QString firstMessage
            = m_chatModel->data(m_chatModel->index(0), ChatModel::Content).toString();
        QString shortMessage = firstMessage.split('\n').first().simplified().left(30);
        shortMessage.replace(QRegularExpression("[^a-zA-Z0-9_-]"), "_");
        parts << shortMessage;
    }

    parts << QDateTime::currentDateTime().toString("yyyy-MM-dd_HH-mm");

    return parts.join("_");
}

void ChatRootView::autosave()
{
    if (m_chatModel->rowCount() == 0 || !Settings::chatAssistantSettings().autosave()) {
        return;
    }

    QString filePath = getAutosaveFilePath();
    if (!filePath.isEmpty()) {
        ChatSerializer::saveToFile(m_chatModel, filePath);
        m_recentFilePath = filePath;
    }
}

QString ChatRootView::getAutosaveFilePath() const
{
    if (!m_recentFilePath.isEmpty()) {
        return m_recentFilePath;
    }

    QString dir = getChatsHistoryDir();
    if (dir.isEmpty()) {
        return QString();
    }

    return QDir(dir).filePath(getSuggestedFileName() + ".json");
}

void ChatRootView::showAttachFilesDialog()
{
    QFileDialog dialog(nullptr, tr("Select Files to Attach"));
    dialog.setFileMode(QFileDialog::ExistingFiles);

    if (auto project = ProjectExplorer::ProjectManager::startupProject()) {
        dialog.setDirectory(project->projectDirectory().toString());
    }

    if (dialog.exec() == QDialog::Accepted) {
        QStringList filePaths = dialog.selectedFiles();
        if (!filePaths.isEmpty()) {
            m_attachmentFiles = filePaths;
            emit attachmentFilesChanged();
        }
    }
}

} // namespace QodeAssist::Chat