#include "genericcreator.hpp"

#include <memory>
#include <utility>

#include <QComboBox>
#include <QHBoxLayout>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QUndoStack>

#include <apps/opencs/model/world/universalid.hpp>

#include <components/misc/strings/lower.hpp>

#include "../../model/world/commands.hpp"
#include "../../model/world/data.hpp"
#include "../../model/world/idtable.hpp"

#include "idvalidator.hpp"

void CSVWorld::GenericCreator::update()
{
    mErrors = getErrors();

    mCreate->setToolTip(QString::fromUtf8(mErrors.c_str()));
    mId->setToolTip(QString::fromUtf8(mErrors.c_str()));

    mCreate->setEnabled(mErrors.empty() && !mLocked);
}

void CSVWorld::GenericCreator::setManualEditing(bool enabled)
{
    mId->setVisible(enabled);
}

void CSVWorld::GenericCreator::insertAtBeginning(QWidget* widget, bool stretched)
{
    mLayout->insertWidget(0, widget, stretched ? 1 : 0);
}

void CSVWorld::GenericCreator::insertBeforeButtons(QWidget* widget, bool stretched)
{
    mLayout->insertWidget(mLayout->count() - 2, widget, stretched ? 1 : 0);

    // Reset tab order relative to buttons.
    setTabOrder(widget, mCreate);
    setTabOrder(mCreate, mCancel);
}

std::string CSVWorld::GenericCreator::getId() const
{
    return mId->text().toUtf8().constData();
}

std::string CSVWorld::GenericCreator::getClonedId() const
{
    return mClonedId;
}

std::string CSVWorld::GenericCreator::getIdValidatorResult() const
{
    std::string errors;

    if (!mId->hasAcceptableInput())
        errors = mValidator->getError();

    return errors;
}

void CSVWorld::GenericCreator::configureCreateCommand(CSMWorld::CreateCommand& command) const {}

void CSVWorld::GenericCreator::pushCommand(std::unique_ptr<CSMWorld::CreateCommand> command, const std::string& id)
{
    mUndoStack.push(command.release());
}

CSMWorld::Data& CSVWorld::GenericCreator::getData() const
{
    return mData;
}

QUndoStack& CSVWorld::GenericCreator::getUndoStack()
{
    return mUndoStack;
}

const CSMWorld::UniversalId& CSVWorld::GenericCreator::getCollectionId() const
{
    return mListId;
}

std::string CSVWorld::GenericCreator::getNamespace() const
{
    CSMWorld::Scope scope = CSMWorld::Scope_Content;

    if (mScope)
    {
        scope = static_cast<CSMWorld::Scope>(mScope->itemData(mScope->currentIndex()).toInt());
    }
    else
    {
        if (mScopes & CSMWorld::Scope_Project)
            scope = CSMWorld::Scope_Project;
        else if (mScopes & CSMWorld::Scope_Session)
            scope = CSMWorld::Scope_Session;
    }

    switch (scope)
    {
        case CSMWorld::Scope_Content:
            return "";
        case CSMWorld::Scope_Project:
            return "project::";
        case CSMWorld::Scope_Session:
            return "session::";
    }

    return "";
}

void CSVWorld::GenericCreator::updateNamespace()
{
    std::string namespace_ = getNamespace();

    mValidator->setNamespace(namespace_);

    int index = mId->text().indexOf("::");

    if (index == -1)
    {
        // no namespace in old text
        mId->setText(QString::fromUtf8(namespace_.c_str()) + mId->text());
    }
    else
    {
        std::string oldNamespace = Misc::StringUtils::lowerCase(mId->text().left(index).toUtf8().constData());

        if (oldNamespace == "project" || oldNamespace == "session")
            mId->setText(QString::fromUtf8(namespace_.c_str()) + mId->text().mid(index + 2));
    }
}

void CSVWorld::GenericCreator::addScope(const QString& name, CSMWorld::Scope scope, const QString& tooltip)
{
    mScope->addItem(name, static_cast<int>(scope));
    mScope->setItemData(mScope->count() - 1, tooltip, Qt::ToolTipRole);
}

CSVWorld::GenericCreator::GenericCreator(
    CSMWorld::Data& data, QUndoStack& undoStack, const CSMWorld::UniversalId& id, bool relaxedIdRules)
    : mData(data)
    , mUndoStack(undoStack)
    , mListId(id)
    , mLocked(false)
    , mClonedType(CSMWorld::UniversalId::Type_None)
    , mScopes(CSMWorld::Scope_Content)
    , mScope(nullptr)
    , mScopeLabel(nullptr)
    , mCloneMode(false)
{
    // If the collection ID has a parent type, use it instead.
    // It will change IDs with Record/SubRecord class (used for creators in Dialogue subviews)
    // to IDs with general RecordList class (used for creators in Table subviews).
    CSMWorld::UniversalId::Type listParentType = CSMWorld::UniversalId::getParentType(mListId.getType());
    if (listParentType != CSMWorld::UniversalId::Type_None)
    {
        mListId = listParentType;
    }

    mLayout = new QHBoxLayout;
    mLayout->setContentsMargins(0, 0, 0, 0);

    mId = new QLineEdit;
    mId->setValidator(mValidator = new IdValidator(relaxedIdRules, this));
    mLayout->addWidget(mId, 1);

    mCreate = new QPushButton("Create");
    mLayout->addWidget(mCreate);

    mCancel = new QPushButton("Cancel");
    mLayout->addWidget(mCancel);

    setLayout(mLayout);

    connect(mCancel, &QPushButton::clicked, this, &GenericCreator::done);
    connect(mCreate, &QPushButton::clicked, this, &GenericCreator::create);

    connect(mId, &QLineEdit::textChanged, this, &GenericCreator::textChanged);
    connect(mId, &QLineEdit::returnPressed, this, &GenericCreator::inputReturnPressed);

    connect(&mData, &CSMWorld::Data::idListChanged, this, &GenericCreator::dataIdListChanged);
}

void CSVWorld::GenericCreator::setEditorMaxLength(int length)
{
    mId->setMaxLength(length);
}

void CSVWorld::GenericCreator::setEditLock(bool locked)
{
    mLocked = locked;
    update();
}

void CSVWorld::GenericCreator::reset()
{
    mCloneMode = false;
    mId->setText("");
    update();
    updateNamespace();
}

std::string CSVWorld::GenericCreator::getErrors() const
{
    std::string errors;

    if (!mId->hasAcceptableInput())
        errors = mValidator->getError();
    else if (mData.hasId(getId()))
        errors = "ID is already in use";

    return errors;
}

void CSVWorld::GenericCreator::textChanged(const QString& text)
{
    update();
}

void CSVWorld::GenericCreator::inputReturnPressed()
{
    if (mCreate->isEnabled())
    {
        create();
    }
}

void CSVWorld::GenericCreator::create()
{
    if (!mLocked)
    {
        std::string id = getId();

        std::unique_ptr<CSMWorld::CreateCommand> command;

        if (mCloneMode)
        {
            command = std::make_unique<CSMWorld::CloneCommand>(
                dynamic_cast<CSMWorld::IdTable&>(*mData.getTableModel(mListId)), mClonedId, id, mClonedType);
        }
        else
        {
            command = std::make_unique<CSMWorld::CreateCommand>(
                dynamic_cast<CSMWorld::IdTable&>(*mData.getTableModel(mListId)), id);
        }

        configureCreateCommand(*command);
        pushCommand(std::move(command), id);

        emit done();
        emit requestFocus(id);
    }
}

void CSVWorld::GenericCreator::cloneMode(const std::string& originId, const CSMWorld::UniversalId::Type type)
{
    mCloneMode = true;
    mClonedId = originId;
    mClonedType = type;
}

void CSVWorld::GenericCreator::touch(const std::vector<CSMWorld::UniversalId>& ids)
{
    // Combine multiple touch commands into one "macro" command
    mUndoStack.beginMacro("Touch Records");

    CSMWorld::IdTable& table = dynamic_cast<CSMWorld::IdTable&>(*mData.getTableModel(mListId));
    for (const CSMWorld::UniversalId& uid : ids)
    {
        CSMWorld::TouchCommand* touchCmd = new CSMWorld::TouchCommand(table, uid.getId());
        mUndoStack.push(touchCmd);
    }

    // Execute
    mUndoStack.endMacro();
}

void CSVWorld::GenericCreator::toggleWidgets(bool active) {}

void CSVWorld::GenericCreator::focus()
{
    mId->setFocus();
}

void CSVWorld::GenericCreator::setScope(unsigned int scope)
{
    mScopes = scope;
    int count = (mScopes & CSMWorld::Scope_Content) + (mScopes & CSMWorld::Scope_Project)
        + (mScopes & CSMWorld::Scope_Session);

    // scope selector widget
    if (count > 1)
    {
        mScope = new QComboBox(this);
        insertAtBeginning(mScope, false);

        if (mScopes & CSMWorld::Scope_Content)
            addScope("Content", CSMWorld::Scope_Content, "Record will be stored in the currently edited content file.");

        if (mScopes & CSMWorld::Scope_Project)
            addScope("Project", CSMWorld::Scope_Project,
                "Record will be stored in a local project file.<p>"
                "Record will be created in the reserved namespace \"project\".<p>"
                "Record is available when running OpenMW via OpenCS.");

        if (mScopes & CSMWorld::Scope_Session)
            addScope("Session", CSMWorld::Scope_Session,
                "Record exists only for the duration of the current editing session.<p>"
                "Record will be created in the reserved namespace \"session\".<p>"
                "Record is not available when running OpenMW via OpenCS.");

        connect(mScope, qOverload<int>(&QComboBox::currentIndexChanged), this, &GenericCreator::scopeChanged);

        mScopeLabel = new QLabel("Scope", this);
        insertAtBeginning(mScopeLabel, false);

        mScope->setCurrentIndex(0);
    }
    else
    {
        delete mScope;
        mScope = nullptr;

        delete mScopeLabel;
        mScopeLabel = nullptr;
    }

    updateNamespace();
}

void CSVWorld::GenericCreator::scopeChanged(int index)
{
    update();
    updateNamespace();
}

void CSVWorld::GenericCreator::dataIdListChanged()
{
    // If the original ID of cloned record was removed, cancel the creator
    if (mCloneMode && !mData.hasId(mClonedId))
    {
        emit done();
    }
}
