/**
 * @file lluictrlfactory.cpp
 * @brief Factory class for creating UI controls
 *
 * $LicenseInfo:firstyear=2003&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "linden_common.h"

#define LLUICTRLFACTORY_CPP
#include "lluictrlfactory.h"

#include "llxmlnode.h"

#include <fstream>
#include <boost/tokenizer.hpp>

// other library includes
#include "llcontrol.h"
#include "lldir.h"
#include "v4color.h"
#include "v3dmath.h"
#include "llquaternion.h"

// this library includes
#include "llpanel.h"

//-----------------------------------------------------------------------------

// UI Ctrl class for padding
class LLUICtrlLocate : public LLUICtrl
{
public:
    struct Params : public LLInitParam::Block<Params, LLUICtrl::Params>
    {
        Params()
        {
            name = "locate";
            tab_stop = false;
        }
    };

    LLUICtrlLocate(const Params& p) : LLUICtrl(p) {}
    virtual void draw() { }

};

static LLDefaultChildRegistry::Register<LLUICtrlLocate> r1("locate");

// Build time optimization, generate this once in .cpp file
template class LLUICtrlFactory* LLSingleton<class LLUICtrlFactory>::getInstance();

//-----------------------------------------------------------------------------
// LLUICtrlFactory()
//-----------------------------------------------------------------------------
LLUICtrlFactory::LLUICtrlFactory()
    : mDummyPanel(NULL) // instantiated when first needed
{
}

LLUICtrlFactory::~LLUICtrlFactory()
{
    // go ahead and leak mDummyPanel since this is static destructor time
    //delete mDummyPanel;
    //mDummyPanel = NULL;
}

void LLUICtrlFactory::loadWidgetTemplate(const std::string& widget_tag, LLInitParam::BaseBlock& block)
{
    std::string filename = gDirUtilp->add("widgets", widget_tag + ".xml");
    LLXMLNodePtr root_node;
    std::vector<std::string> search_paths =
        gDirUtilp->findSkinnedFilenames(LLDir::XUI, filename);

    if (search_paths.empty())
    {
        return;
    }

    // "en" version, the default-language version of the file.
    std::string base_filename = search_paths.front();
    if (!base_filename.empty())
    {
        LLUICtrlFactory::instance().pushFileName(base_filename);

        if (!LLXMLNode::getLayeredXMLNode(root_node, search_paths))
        {
            LL_WARNS() << "Couldn't parse widget from: " << base_filename << LL_ENDL;
            return;
        }
        LLXUIParser parser;
        parser.readXUI(root_node, block, base_filename);
        LLUICtrlFactory::instance().popFileName();
    }
}

//static
void LLUICtrlFactory::createChildren(LLView* viewp, LLXMLNodePtr node, const widget_registry_t& registry, LLXMLNodePtr output_node)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_UI;
    if (node.isNull()) return;

    for (LLXMLNodePtr child_node = node->getFirstChild(); child_node.notNull(); child_node = child_node->getNextSibling())
    {
        LLXMLNodePtr outputChild;
        if (output_node)
        {
            outputChild = output_node->createChild("", false);
        }

        if (!instance().createFromXML(child_node, viewp, LLStringUtil::null, registry, outputChild))
        {
            // child_node is not a valid child for the current parent
            std::string child_name = std::string(child_node->getName()->mString);
            if (LLDefaultChildRegistry::instance().getValue(child_name))
            {
                // This means that the registry assocaited with the parent widget does not have an entry
                // for the child widget
                // You might need to add something like:
                // static ParentWidgetRegistry::Register<ChildWidgetType> register("child_widget_name");
                LL_WARNS() << child_name << " is not a valid child of " << node->getName()->mString << LL_ENDL;
            }
            else
            {
                LL_WARNS() << "Could not create widget named " << child_node->getName()->mString << LL_ENDL;
            }
        }

        if (outputChild && !outputChild->mChildren && outputChild->mAttributes.empty() && outputChild->getValue().empty())
        {
            output_node->deleteChild(outputChild);
        }
    }

}

//-----------------------------------------------------------------------------
// getLayeredXMLNode()
//-----------------------------------------------------------------------------
bool LLUICtrlFactory::getLayeredXMLNode(const std::string &xui_filename, LLXMLNodePtr& root,
                                        LLDir::ESkinConstraint constraint)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_UI;
    std::vector<std::string> paths =
        gDirUtilp->findSkinnedFilenames(LLDir::XUI, xui_filename, constraint);

    if (paths.empty())
    {
        // sometimes whole path is passed in as filename
        paths.push_back(xui_filename);
    }

    return LLXMLNode::getLayeredXMLNode(root, paths);
}


//-----------------------------------------------------------------------------
// saveToXML()
//-----------------------------------------------------------------------------
S32 LLUICtrlFactory::saveToXML(LLView* viewp, const std::string& filename)
{
    return 0;
}

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------

LLView *LLUICtrlFactory::createFromXML(LLXMLNodePtr node, LLView* parent, const std::string& filename, const widget_registry_t& registry, LLXMLNodePtr output_node)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_UI;
    std::string ctrl_type = node->getName()->mString;
    LLStringUtil::toLower(ctrl_type);

    const LLWidgetCreatorFunc* funcp = registry.getValue(ctrl_type);
    if (funcp == NULL)
    {
        return NULL;
    }

    if (parent == NULL)
    {
        if (mDummyPanel == NULL)
        {
            LLPanel::Params p;
            mDummyPanel = create<LLPanel>(p);
        }
        parent = mDummyPanel;
    }
    LLView *view = (*funcp)(node, parent, output_node);

    return view;
}

std::string LLUICtrlFactory::getCurFileName()
{
    return mFileNames.empty() ? "" : mFileNames.back();
}


void LLUICtrlFactory::pushFileName(const std::string& name)
{
    // Here we seem to be looking for the default language file ("en") rather
    // than the localized one, if any.
    mFileNames.push_back(gDirUtilp->findSkinnedFilenameBaseLang(LLDir::XUI, name));
}

void LLUICtrlFactory::popFileName()
{
    mFileNames.pop_back();
}

//static
void LLUICtrlFactory::setCtrlParent(LLView* view, LLView* parent, S32 tab_group)
{
    if (tab_group == S32_MAX) tab_group = parent->getLastTabGroup();
    parent->addChild(view, tab_group);
}

//static
void LLUICtrlFactory::copyName(LLXMLNodePtr src, LLXMLNodePtr dest)
{
    dest->setName(src->getName()->mString);
}

template<typename T>
const LLInitParam::BaseBlock& get_empty_param_block()
{
    static typename T::Params params;
    return params;
}

// adds a widget and its param block to various registries
//static
void LLUICtrlFactory::registerWidget(const std::type_info* widget_type, const std::type_info* param_block_type, const std::string& name)
{
    // associate parameter block type with template .xml file
    std::string* existing_name = LLWidgetNameRegistry::instance().getValue(param_block_type);
    if (existing_name != NULL)
    {
        if(*existing_name != name)
        {
            std::cerr << "Duplicate entry for T::Params, try creating empty param block in derived classes that inherit T::Params" << std::endl;
            // forcing crash here
            char* foo = 0;
            *foo = 1;
        }
        else
        {
            // widget already registered this name
            return;
        }
    }

    LLWidgetNameRegistry::instance().defaultRegistrar().add(param_block_type, name);
    //FIXME: comment this in when working on schema generation
    //LLWidgetTypeRegistry::instance().defaultRegistrar().add(tag, widget_type);
    //LLDefaultParamBlockRegistry::instance().defaultRegistrar().add(widget_type, &get_empty_param_block<T>);
}