/**
* @file llfolderviewitem.h
* @brief Items and folders that can appear in a hierarchical folder view
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* 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
* $/LicenseInfo$
*/
#ifndef LLFOLDERVIEWITEM_H
#define LLFOLDERVIEWITEM_H

#include "llflashtimer.h"
#include "llview.h"
#include "lluiimage.h"
#include "llfontvertexbuffer.h"

class LLFolderView;
class LLFolderViewModelItem;
class LLFolderViewFolder;
class LLFolderViewFunctor;
class LLFolderViewFilter;
class LLFolderViewModelInterface;

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLFolderViewItem
//
// An instance of this class represents a single item in a folder view
// such as an inventory item or a file.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

class LLFolderViewItem : public LLView
{
public:
    struct Params : public LLInitParam::Block<Params, LLView::Params>
    {
        Optional<LLUIImage*>                        folder_arrow_image,
                                                    selection_image;
        Mandatory<LLFolderView*>                    root;
        Mandatory<LLFolderViewModelItem*>           listener;

        Optional<S32>                               folder_indentation, // pixels
                                                    item_height,
                                                    item_top_pad;

        Optional<time_t>                            creation_date;
        Optional<bool>                              allow_wear;
        Optional<bool>                              allow_drop;

        Optional<LLUIColor>                         font_color;
        Optional<LLUIColor>                         font_highlight_color;

        Optional<S32>                               left_pad,
                                                    icon_pad,
                                                    icon_width,
                                                    text_pad,
                                                    text_pad_right,
                                                    arrow_size,
                                                    max_folder_item_overlap;
        Optional<bool>                              single_folder_mode,
                                                    double_click_override;
        Params();
    };


    static const S32    DEFAULT_LABEL_PADDING_RIGHT = 4;
    // animation parameters
    static const F32    FOLDER_CLOSE_TIME_CONSTANT,
                        FOLDER_OPEN_TIME_CONSTANT;

protected:
    friend class LLUICtrlFactory;
    friend class LLFolderViewModelItem;

    LLFolderViewItem(const Params& p);

    LLWString                   mLabel;
    S32                         mLabelWidth;
    bool                        mLabelWidthDirty;
    S32                         mLabelPaddingRight;
    LLFolderViewFolder*         mParentFolder;
    LLPointer<LLFolderViewModelItem> mViewModelItem;
    LLFontGL::StyleFlags        mLabelStyle;
    LLWString                   mLabelSuffix;
    bool                        mSuffixNeedsRefresh; //suffix and icons
    LLUIImagePtr                mIcon,
                                mIconOpen,
                                mIconOverlay;
    S32                         mLocalIndentation;
    S32                         mIndentation;
    S32                         mItemHeight;
    S32                         mDragStartX,
                                mDragStartY;

    S32                         mLeftPad,
                                mIconPad,
                                mIconWidth,
                                mTextPad,
                                mTextPadRight,
                                mArrowSize,
                                mMaxFolderItemOverlap;

    F32                         mControlLabelRotation;
    LLFolderView*               mRoot;
    bool                        mHasVisibleChildren,
                                mIsCurSelection,
                                mDragAndDropTarget,
                                mIsMouseOverTitle,
                                mAllowWear,
                                mAllowDrop,
                                mSingleFolderMode,
                                mDoubleClickOverride,
                                mSelectPending,
                                mIsItemCut;

    S32                         mCutGeneration;

    LLUIColor                   mFontColor;
    LLUIColor                   mFontHighlightColor;

    // For now assuming all colors are the same in derived classes.
    static LLUIColor            sFgColor;
    static LLUIColor            sFgDisabledColor;
    static LLUIColor            sHighlightBgColor;
    static LLUIColor            sFlashBgColor;
    static LLUIColor            sFocusOutlineColor;
    static LLUIColor            sMouseOverColor;
    static LLUIColor            sFilterBGColor;
    static LLUIColor            sFilterTextColor;
    static LLUIColor            sSuffixColor;
    static LLUIColor            sSearchStatusColor;

    // this is an internal method used for adding items to folders. A
    // no-op at this level, but reimplemented in derived classes.
    virtual void addItem(LLFolderViewItem*) { }
    virtual void addFolder(LLFolderViewFolder*) { }
    virtual bool isHighlightAllowed();
    virtual bool isHighlightActive();
    virtual bool isFadeItem();
    virtual bool isFlashing() { return false; }
    virtual void setFlashState(bool) { }

    static LLFontGL* getLabelFontForStyle(U8 style);
    const LLFontGL* getLabelFont();

    bool                        mIsSelected;

public:
    static void initClass();
    static void cleanupClass();

    bool postBuild();

    virtual void openItem( void );

    void arrangeAndSet(bool set_selection, bool take_keyboard_focus);

    virtual ~LLFolderViewItem( void );

    // addToFolder() returns true if it succeeds. false otherwise
    virtual void addToFolder(LLFolderViewFolder* folder);

    // Finds width and height of this object and it's children.  Also
    // makes sure that this view and it's children are the right size.
    virtual S32 arrange( S32* width, S32* height );
    virtual S32 getItemHeight() const;
    virtual S32 getLabelXPos();
    S32 getIconPad();
    S32 getTextPad();

    // If 'selection' is 'this' then note that otherwise ignore.
    // Returns true if this item ends up being selected.
    virtual bool setSelection(LLFolderViewItem* selection, bool openitem, bool take_keyboard_focus);

    // This method is used to set the selection state of an item.
    // If 'selection' is 'this' then note selection.
    // Returns true if the selection state of this item was changed.
    virtual bool changeSelection(LLFolderViewItem* selection, bool selected);

    // this method is used to deselect this element
    void deselectItem();

    // this method is used to select this element
    virtual void selectItem();

    // gets multiple-element selection
    virtual std::set<LLFolderViewItem*> getSelectionList() const;

    // Returns true is this object and all of its children can be removed (deleted by user)
    virtual bool isRemovable();

    // Returns true is this object and all of its children can be moved
    virtual bool isMovable();

    // destroys this item recursively
    virtual void destroyView();

    bool isSelected() const { return mIsSelected; }
    bool isInSelection() const;

    void setUnselected() { mIsSelected = false; }

    void setIsCurSelection(bool select) { mIsCurSelection = select; }

    bool getIsCurSelection() const { return mIsCurSelection; }

    bool hasVisibleChildren() const { return mHasVisibleChildren; }

    // true if object can't have children
    virtual bool isFolderComplete() { return true; }
    // true if object can't have children
    virtual bool areChildrenInited() { return true; }
    virtual void setChildrenInited(bool inited) { }

    // Call through to the viewed object and return true if it can be
    // removed. Returns true if it's removed.
    //virtual bool removeRecursively(bool single_item);
    bool remove();

    // Build an appropriate context menu for the item.  Flags unused.
    void buildContextMenu(class LLMenuGL& menu, U32 flags);

    // This method returns the actual name of the thing being
    // viewed. This method will ask the viewed object itself.
    const std::string& getName( void ) const;

    // This method returns the label displayed on the view. This
    // method was primarily added to allow sorting on the folder
    // contents possible before the entire view has been constructed.
    const LLWString& getLabel() const { return mLabel; }

    LLFolderViewFolder* getParentFolder( void ) { return mParentFolder; }
    const LLFolderViewFolder* getParentFolder( void ) const { return mParentFolder; }

    void setParentFolder(LLFolderViewFolder* parent) { mParentFolder = parent; }

    LLFolderViewItem* getNextOpenNode( bool include_children = true );
    LLFolderViewItem* getPreviousOpenNode( bool include_children = true );

    const LLFolderViewModelItem* getViewModelItem( void ) const { return mViewModelItem; }
    LLFolderViewModelItem* getViewModelItem( void ) { return mViewModelItem; }

    const LLFolderViewModelInterface* getFolderViewModel( void ) const;
    LLFolderViewModelInterface* getFolderViewModel( void );

    // just rename the object.
    void rename(const std::string& new_name);

    // Show children
    virtual void setOpen(bool open = true) {};
    virtual bool isOpen() const { return false; }

    virtual LLFolderView*   getRoot();
    virtual const LLFolderView* getRoot() const;
    bool            isDescendantOf( const LLFolderViewFolder* potential_ancestor );
    S32             getIndentation() const { return mIndentation; }

    virtual bool    passedFilter(S32 filter_generation = -1);
    virtual bool    isPotentiallyVisible(S32 filter_generation = -1);

    // refresh information from the object being viewed.
    // refreshes label, suffixes and sets icons. Expensive!
    // Causes filter update
    virtual void refresh();
    // refreshes suffixes and sets icons. Expensive!
    // Does not need filter update
    virtual void refreshSuffix();

    bool isSingleFolderMode() { return mSingleFolderMode; }

    // LLView functionality
    virtual bool handleRightMouseDown( S32 x, S32 y, MASK mask );
    virtual bool handleMouseDown( S32 x, S32 y, MASK mask );
    virtual bool handleHover( S32 x, S32 y, MASK mask );
    virtual bool handleMouseUp( S32 x, S32 y, MASK mask );
    virtual bool handleDoubleClick( S32 x, S32 y, MASK mask );

    virtual void onMouseLeave(S32 x, S32 y, MASK mask);

    //virtual LLView* findChildView(const std::string& name, bool recurse) const { return LLView::findChildView(name, recurse); }

    //  virtual void handleDropped();
    virtual void draw();
    void drawOpenFolderArrow();
    void drawHighlight(bool showContent, bool hasKeyboardFocus, const LLUIColor& selectColor, const LLUIColor& flashColor, const LLUIColor& outlineColor, const LLUIColor& mouseOverColor);
    void drawLabel(const LLFontGL* font, const F32 x, const F32 y, const LLColor4& color, F32 &right_x);
    virtual bool handleDragAndDrop(S32 x, S32 y, MASK mask, bool drop,
                                    EDragAndDropType cargo_type,
                                    void* cargo_data,
                                    EAcceptance* accept,
                                    std::string& tooltip_msg);

private:
    static std::map<U8, LLFontGL*> sFonts; // map of styles to fonts
    static S32 sTopPad;
    static LLUIImagePtr sFolderArrowImg;
    static LLUIImagePtr sSelectionImg;
    static LLFontGL* sSuffixFont;

    LLFontVertexBuffer mLabelFontBuffer;
    LLFontVertexBuffer mSuffixFontBuffer;
    LLFontGL* pLabelFont{nullptr};
};

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLFolderViewFolder
//
// An instance of an LLFolderViewFolder represents a collection of
// more folders and items. This is used to build the hierarchy of
// items found in the folder view.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

class LLFolderViewFolder : public LLFolderViewItem
{
protected:
    LLFolderViewFolder( const LLFolderViewItem::Params& );
    friend class LLUICtrlFactory;

    void updateLabelRotation();
    virtual bool isCollapsed() { return false; }

public:
    typedef std::list<LLFolderViewItem*> items_t;
    typedef std::list<LLFolderViewFolder*> folders_t;

protected:
    items_t mItems;
    folders_t mFolders;

    bool        mIsOpen;
    bool        mExpanderHighlighted;
    F32         mCurHeight;
    F32         mTargetHeight;
    F32         mAutoOpenCountdown;
    S32         mLastArrangeGeneration;
    S32         mLastCalculatedWidth;
    bool        mIsFolderComplete; // indicates that some children were not loaded/added yet
    bool        mAreChildrenInited; // indicates that no children were initialized

public:
    typedef enum e_recurse_type
    {
        RECURSE_NO,
        RECURSE_UP,
        RECURSE_DOWN,
        RECURSE_UP_DOWN
    } ERecurseType;


    virtual ~LLFolderViewFolder( void );

    LLFolderViewItem* getNextFromChild( LLFolderViewItem*, bool include_children = true );
    LLFolderViewItem* getPreviousFromChild( LLFolderViewItem*, bool include_children = true  );

    // addToFolder() returns true if it succeeds. false otherwise
    virtual void addToFolder(LLFolderViewFolder* folder);

    // Finds width and height of this object and it's children.  Also
    // makes sure that this view and it's children are the right size.
    virtual S32 arrange( S32* width, S32* height );

    bool needsArrange();

    bool descendantsPassedFilter(S32 filter_generation = -1);

    // Passes selection information on to children and record
    // selection information if necessary.
    // Returns true if this object (or a child) ends up being selected.
    // If 'openitem' is true then folders are opened up along the way to the selection.
    virtual bool setSelection(LLFolderViewItem* selection, bool openitem, bool take_keyboard_focus = true);

    // This method is used to change the selection of an item.
    // Recursively traverse all children; if 'selection' is 'this' then change
    // the select status if necessary.
    // Returns true if the selection state of this folder, or of a child, was changed.
    virtual bool changeSelection(LLFolderViewItem* selection, bool selected);

    // this method is used to group select items
    void extendSelectionTo(LLFolderViewItem* selection);

    // Returns true is this object and all of its children can be removed.
    virtual bool isRemovable();

    // Returns true is this object and all of its children can be moved
    virtual bool isMovable();

    // destroys this folder, and all children
    virtual void destroyView();
    void destroyRoot();

    // whether known children are fully loaded (arrange sets to true)
    virtual bool isFolderComplete() { return mIsFolderComplete; }

    // whether known children are fully built
    virtual bool areChildrenInited() { return mAreChildrenInited; }
    virtual void setChildrenInited(bool inited) { mAreChildrenInited = inited; }

    // extractItem() removes the specified item from the folder, but
    // doesn't delete it.
    virtual void extractItem( LLFolderViewItem* item, bool deparent_model = true);

    // This function is called by a child that needs to be resorted.
    void resort(LLFolderViewItem* item);

    void setAutoOpenCountdown(F32 countdown) { mAutoOpenCountdown = countdown; }

    // folders can be opened. This will usually be called by internal
    // methods.
    virtual void toggleOpen();

    // Force a folder open or closed
    virtual void setOpen(bool openitem = true);

    // Called when a child is refreshed.
    virtual void requestArrange();

    // internal method which doesn't update the entire view. This
    // method was written because the list iterators destroy the state
    // of other iterations, thus, we can't arrange while iterating
    // through the children (such as when setting which is selected.
    virtual void setOpenArrangeRecursively(bool openitem, ERecurseType recurse = RECURSE_NO);

    // Get the current state of the folder.
    virtual bool isOpen() const { return mIsOpen; }

    // special case if an object is dropped on the child.
    bool handleDragAndDropFromChild(MASK mask,
                                    bool drop,
                                    EDragAndDropType cargo_type,
                                    void* cargo_data,
                                    EAcceptance* accept,
                                    std::string& tooltip_msg);


    // Just apply this functor to the folder's immediate children.
    void applyFunctorToChildren(LLFolderViewFunctor& functor);
    // apply this functor to the folder's descendants.
    void applyFunctorRecursively(LLFolderViewFunctor& functor);

    virtual void openItem( void );

    // LLView functionality
    virtual bool handleHover(S32 x, S32 y, MASK mask);
    virtual bool handleRightMouseDown( S32 x, S32 y, MASK mask );
    virtual bool handleMouseDown( S32 x, S32 y, MASK mask );
    virtual bool handleDoubleClick( S32 x, S32 y, MASK mask );
    virtual bool handleDragAndDrop(S32 x, S32 y, MASK mask,
                                    bool drop,
                                    EDragAndDropType cargo_type,
                                    void* cargo_data,
                                    EAcceptance* accept,
                                    std::string& tooltip_msg);
    bool handleDragAndDropToThisFolder(MASK mask,
                                        bool drop,
                                       EDragAndDropType cargo_type,
                                       void* cargo_data,
                                       EAcceptance* accept,
                                       std::string& tooltip_msg);
    virtual void draw();

    folders_t::iterator getFoldersBegin() { return mFolders.begin(); }
    folders_t::iterator getFoldersEnd() { return mFolders.end(); }
    folders_t::size_type getFoldersCount() const { return mFolders.size(); }

    items_t::const_iterator getItemsBegin() const { return mItems.begin(); }
    items_t::const_iterator getItemsEnd() const { return mItems.end(); }
    items_t::size_type getItemsCount() const { return mItems.size(); }

    LLFolderViewFolder* getCommonAncestor(LLFolderViewItem* item_a, LLFolderViewItem* item_b, bool& reverse);
    void gatherChildRangeExclusive(LLFolderViewItem* start, LLFolderViewItem* end, bool reverse,  std::vector<LLFolderViewItem*>& items);

    // internal functions for tracking folders and items separately
    // use addToFolder() virtual method to ensure folders are always added to mFolders
    // and not mItems
    void addItem(LLFolderViewItem* item);
    void addFolder( LLFolderViewFolder* folder);

    //WARNING: do not call directly...use the appropriate LLFolderViewModel-derived class instead
    template<typename SORT_FUNC> void sortFolders(const SORT_FUNC& func) { mFolders.sort(func); }
    template<typename SORT_FUNC> void sortItems(const SORT_FUNC& func) { mItems.sort(func); }
};

typedef std::deque<LLFolderViewItem*> folder_view_item_deque;

class LLFolderViewGroupedItemModel: public LLRefCount
{
public:
    virtual void groupFilterContextMenu(folder_view_item_deque& selected_items, LLMenuGL& menu) = 0;
};

#endif  // LLFOLDERVIEWITEM_H