/* 
 * 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 "ContextSettings.hpp"

#include <QMessageBox>
#include <coreplugin/dialogs/ioptionspage.h>
#include <coreplugin/icore.h>
#include <utils/layoutbuilder.h>

#include "SettingsConstants.hpp"
#include "SettingsTr.hpp"
#include "SettingsUtils.hpp"

namespace QodeAssist::Settings {
ContextSettings &contextSettings()
{
    static ContextSettings settings;
    return settings;
}

ContextSettings::ContextSettings()
{
    setAutoApply(false);

    setDisplayName(Tr::tr("Context"));

    readFullFile.setSettingsKey(Constants::CC_READ_FULL_FILE);
    readFullFile.setLabelText(Tr::tr("Read Full File"));
    readFullFile.setDefaultValue(false);

    readStringsBeforeCursor.setSettingsKey(Constants::CC_READ_STRINGS_BEFORE_CURSOR);
    readStringsBeforeCursor.setLabelText(Tr::tr("Read Strings Before Cursor"));
    readStringsBeforeCursor.setRange(0, 10000);
    readStringsBeforeCursor.setDefaultValue(50);

    readStringsAfterCursor.setSettingsKey(Constants::CC_READ_STRINGS_AFTER_CURSOR);
    readStringsAfterCursor.setLabelText(Tr::tr("Read Strings After Cursor"));
    readStringsAfterCursor.setRange(0, 10000);
    readStringsAfterCursor.setDefaultValue(30);

    useFilePathInContext.setSettingsKey(Constants::CC_USE_FILE_PATH_IN_CONTEXT);
    useFilePathInContext.setDefaultValue(false);
    useFilePathInContext.setLabelText(Tr::tr("Use File Path in Context"));

    useSystemPrompt.setSettingsKey(Constants::CC_USE_SYSTEM_PROMPT);
    useSystemPrompt.setDefaultValue(true);
    useSystemPrompt.setLabelText(Tr::tr("Use System Prompt"));

    systemPrompt.setSettingsKey(Constants::CC_SYSTEM_PROMPT);
    systemPrompt.setDisplayStyle(Utils::StringAspect::TextEditDisplay);
    systemPrompt.setDefaultValue(
        "You are an expert C++, Qt, and QML code completion AI. Your task is to provide accurate "
        "and "
        "contextually appropriate code suggestions. Focus on completing the code in a way that "
        "follows best practices, is efficient, and matches the surrounding code style. Prioritize "
        "Qt and QML-specific completions when appropriate. Avoid adding comments or explanations "
        "in your completions.");

    useChatSystemPrompt.setSettingsKey(Constants::CA_SYSTEM_PROMPT);
    useChatSystemPrompt.setDefaultValue(true);
    useChatSystemPrompt.setLabelText(Tr::tr("Use System Prompt for chat"));

    chatSystemPrompt.setSettingsKey(Constants::CA_SYSTEM_PROMPT);
    chatSystemPrompt.setDisplayStyle(Utils::StringAspect::TextEditDisplay);
    chatSystemPrompt.setDefaultValue(
        "You are an advanced AI assistant specializing in C++, Qt, and QML development. Your role "
        "is "
        "to provide helpful, accurate, and detailed responses to questions about coding, "
        "debugging, "
        "and best practices in these technologies. Offer clear explanations, code examples when "
        "appropriate, and guidance on Qt Creator usage. Always prioritize officially recommended "
        "Qt "
        "and C++ practices. If you're unsure about something, state it clearly and suggest where "
        "the "
        "user might find more information.");

    resetToDefaults.m_buttonText = Tr::tr("Reset Page to Defaults");

    useProjectChangesCache.setSettingsKey(Constants::CC_USE_PROJECT_CHANGES_CACHE);
    useProjectChangesCache.setDefaultValue(true);
    useProjectChangesCache.setLabelText(Tr::tr("Use Project Changes Cache"));

    maxChangesCacheSize.setSettingsKey(Constants::CC_MAX_CHANGES_CACHE_SIZE);
    maxChangesCacheSize.setLabelText(Tr::tr("Max Changes Cache Size"));
    maxChangesCacheSize.setRange(2, 1000);
    maxChangesCacheSize.setDefaultValue(20);

    readSettings();

    readStringsAfterCursor.setEnabled(!readFullFile());
    readStringsBeforeCursor.setEnabled(!readFullFile());
    systemPrompt.setEnabled(useSystemPrompt());

    setupConnection();

    setLayouter([this]() {
        using namespace Layouting;
        return Column{Row{Stretch{1}, resetToDefaults},
                      Group{title(Tr::tr("AI Suggestions Context")),
                            Column{Row{readFullFile, Stretch{1}},
                                   Row{readStringsBeforeCursor, Stretch{1}},
                                   Row{readStringsAfterCursor, Stretch{1}},
                                   useFilePathInContext,
                                   useSystemPrompt,
                                   systemPrompt,
                                   useProjectChangesCache,
                                   Row{maxChangesCacheSize, Stretch{1}},
                                   Stretch{1}}},
                      Space{16},
                      Group{title(Tr::tr("AI Chat Context")),
                            Column{useChatSystemPrompt, chatSystemPrompt}}};
    });
}

void ContextSettings::setupConnection()
{
    connect(&readFullFile, &Utils::BoolAspect::volatileValueChanged, this, [this]() {
        readStringsAfterCursor.setEnabled(!readFullFile.volatileValue());
        readStringsBeforeCursor.setEnabled(!readFullFile.volatileValue());
    });
    connect(&useSystemPrompt, &Utils::BoolAspect::volatileValueChanged, this, [this]() {
        systemPrompt.setEnabled(useSystemPrompt.volatileValue());
    });
    connect(&resetToDefaults, &ButtonAspect::clicked, this, &ContextSettings::resetPageToDefaults);
}

void ContextSettings::resetPageToDefaults()
{
    QMessageBox::StandardButton reply;
    reply = QMessageBox::question(
        Core::ICore::dialogParent(),
        Tr::tr("Reset Settings"),
        Tr::tr("Are you sure you want to reset all settings to default values?"),
        QMessageBox::Yes | QMessageBox::No);

    if (reply == QMessageBox::Yes) {
        resetAspect(readFullFile);
        resetAspect(readStringsBeforeCursor);
        resetAspect(readStringsAfterCursor);
        resetAspect(useFilePathInContext);
        resetAspect(useSystemPrompt);
        resetAspect(systemPrompt);
        resetAspect(useChatSystemPrompt);
        resetAspect(chatSystemPrompt);
    }
}

class ContextSettingsPage : public Core::IOptionsPage
{
public:
    ContextSettingsPage()
    {
        setId(Constants::QODE_ASSIST_CONTEXT_SETTINGS_PAGE_ID);
        setDisplayName(Tr::tr("Context"));
        setCategory(Constants::QODE_ASSIST_GENERAL_OPTIONS_CATEGORY);
        setDisplayCategory(Constants::QODE_ASSIST_GENERAL_OPTIONS_DISPLAY_CATEGORY);
        setCategoryIconPath(":/resources/images/qoderassist-icon.png");
        setSettingsProvider([] { return &contextSettings(); });
    }
};

const ContextSettingsPage contextSettingsPage;

} // namespace QodeAssist::Settings