/**
 * @file lltoolbar.h
 * @author Richard Nelson
 * @brief User customizable toolbar class
 *
 * $LicenseInfo:firstyear=2011&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2011, 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 LL_LLTOOLBAR_H
#define LL_LLTOOLBAR_H

#include "llbutton.h"
#include "llcommandmanager.h"
#include "lllayoutstack.h"
#include "lluictrl.h"
#include "llcommandmanager.h"
#include "llassettype.h"

class LLToolBar;
class LLToolBarButton;
class LLIconCtrl;

typedef boost::function<void (S32 x, S32 y, LLToolBarButton* button)> tool_startdrag_callback_t;
typedef boost::function<bool (S32 x, S32 y, const LLUUID& uuid, LLAssetType::EType type)> tool_handledrag_callback_t;
typedef boost::function<bool (void* data, S32 x, S32 y, LLToolBar* toolbar)> tool_handledrop_callback_t;

class LLToolBarButton : public LLButton
{
    friend class LLToolBar;
public:
    struct Params : public LLInitParam::Block<Params, LLButton::Params>
    {
        Optional<LLUI::RangeS32::Params>    button_width;
        Optional<S32>                       desired_height;

        Params()
        :   button_width("button_width"),
            desired_height("desired_height", 20)
        {}

    };

    LLToolBarButton(const Params& p);
    ~LLToolBarButton();

    bool handleMouseDown(S32 x, S32 y, MASK mask);
    bool handleHover(S32 x, S32 y, MASK mask);

    void reshape(S32 width, S32 height, bool called_from_parent = true);
    void setEnabled(bool enabled);
    void setCommandId(const LLCommandId& id) { mId = id; }
    LLCommandId getCommandId() const { return mId; }

    void setStartDragCallback(tool_startdrag_callback_t cb)   { mStartDragItemCallback  = cb; }
    void setHandleDragCallback(tool_handledrag_callback_t cb) { mHandleDragItemCallback = cb; }

    void onMouseEnter(S32 x, S32 y, MASK mask);
    void onMouseLeave(S32 x, S32 y, MASK mask);
    void onMouseCaptureLost();

    void onCommit();

    virtual const std::string getToolTip() const;

private:
    void callIfEnabled(LLUICtrl::commit_callback_t commit, LLUICtrl* ctrl, const LLSD& param );

    LLCommandId     mId;
    S32             mMouseDownX;
    S32             mMouseDownY;
    LLUI::RangeS32  mWidthRange;
    S32             mDesiredHeight;
    bool                            mIsDragged;
    tool_startdrag_callback_t       mStartDragItemCallback;
    tool_handledrag_callback_t      mHandleDragItemCallback;

    enable_signal_t*    mIsEnabledSignal;
    enable_signal_t*    mIsRunningSignal;
    enable_signal_t*    mIsStartingSignal;
    LLPointer<LLUIImage>    mOriginalImageSelected,
                            mOriginalImageUnselected,
                            mOriginalImagePressed,
                            mOriginalImagePressedSelected;
    LLUIColor               mOriginalLabelColor,
                            mOriginalLabelColorSelected,
                            mOriginalImageOverlayColor,
                            mOriginalImageOverlaySelectedColor;
};


namespace LLToolBarEnums
{
    enum ButtonType
    {
        BTNTYPE_ICONS_WITH_TEXT = 0,
        BTNTYPE_ICONS_ONLY,

        BTNTYPE_COUNT
    };

    enum SideType
    {
        SIDE_BOTTOM,
        SIDE_LEFT,
        SIDE_RIGHT,
        SIDE_TOP,
    };

    enum EToolBarLocation
    {
        TOOLBAR_NONE = 0,
        TOOLBAR_LEFT,
        TOOLBAR_RIGHT,
        TOOLBAR_BOTTOM,

        TOOLBAR_COUNT,

        TOOLBAR_FIRST = TOOLBAR_LEFT,
        TOOLBAR_LAST = TOOLBAR_BOTTOM,
    };

    LLView::EOrientation getOrientation(SideType sideType);
}

// NOTE: This needs to occur before Param block declaration for proper compilation.
namespace LLInitParam
{
    template<>
    struct TypeValues<LLToolBarEnums::ButtonType> : public TypeValuesHelper<LLToolBarEnums::ButtonType>
    {
        static void declareValues();
    };

    template<>
    struct TypeValues<LLToolBarEnums::SideType> : public TypeValuesHelper<LLToolBarEnums::SideType>
    {
        static void declareValues();
    };
}


class LLToolBar
:   public LLUICtrl
{
    friend class LLToolBarButton;
public:

    class LLCenterLayoutPanel : public LLLayoutPanel
    {
    public:
        typedef boost::function<void(LLToolBarEnums::EToolBarLocation tb, const LLRect& rect)> reshape_callback_t;

        virtual ~LLCenterLayoutPanel() {}
        /*virtual*/ void handleReshape(const LLRect& rect, bool by_user);

        void setLocationId(LLToolBarEnums::EToolBarLocation id) { mLocationId = id; }
        void setReshapeCallback(reshape_callback_t cb) { mReshapeCallback = cb; }
        void setButtonPanel(LLPanel * panel) { mButtonPanel = panel; }

    protected:
        friend class LLUICtrlFactory;
        LLCenterLayoutPanel(const Params& params) : LLLayoutPanel(params) {};

    private:
        reshape_callback_t                  mReshapeCallback;
        LLToolBarEnums::EToolBarLocation    mLocationId{ LLToolBarEnums::EToolBarLocation::TOOLBAR_NONE };
        LLPanel *                           mButtonPanel{ nullptr };
    };

    struct Params : public LLInitParam::Block<Params, LLUICtrl::Params>
    {
        Mandatory<LLToolBarEnums::ButtonType>   button_display_mode;
        Mandatory<LLToolBarEnums::SideType>     side;

        Optional<LLToolBarButton::Params>       button_icon,
                                                button_icon_and_text;

        Optional<bool>                          read_only,
                                                wrap;

        Optional<S32>                           pad_left,
                                                pad_top,
                                                pad_right,
                                                pad_bottom,
                                                pad_between,
                                                min_girth;

        // default command set
        Multiple<LLCommandId::Params>           commands;

        Optional<LLPanel::Params>               button_panel;

        Params();
    };

    // virtuals
    void draw();
    void reshape(S32 width, S32 height, bool called_from_parent = true);
    bool handleRightMouseDown(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);

    static const int RANK_NONE = -1;
    bool addCommand(const LLCommandId& commandId, int rank = RANK_NONE);
    int  removeCommand(const LLCommandId& commandId);       // Returns the rank the removed command was at, RANK_NONE if not found
    bool hasCommand(const LLCommandId& commandId) const;    // is this command bound to a button in this toolbar
    bool enableCommand(const LLCommandId& commandId, bool enabled); // enable/disable button bound to the specified command, if it exists in this toolbar
    bool stopCommandInProgress(const LLCommandId& commandId);   // stop command if it is currently active
    bool flashCommand(const LLCommandId& commandId, bool flash, bool force_flashing = false); // flash button associated with given command, if in this toolbar

    void setStartDragCallback(tool_startdrag_callback_t cb)   { mStartDragItemCallback  = cb; } // connects drag and drop behavior to external logic
    void setHandleDragCallback(tool_handledrag_callback_t cb) { mHandleDragItemCallback = cb; }
    void setHandleDropCallback(tool_handledrop_callback_t cb) { mHandleDropCallback     = cb; }
    bool isReadOnly() const { return mReadOnly; }
    LLCenterLayoutPanel * getCenterLayoutPanel() const { return mCenterPanel; }

    LLToolBarButton* createButton(const LLCommandId& id);

    typedef boost::signals2::signal<void (LLView* button)> button_signal_t;
    boost::signals2::connection setButtonAddCallback(const button_signal_t::slot_type& cb);
    boost::signals2::connection setButtonEnterCallback(const button_signal_t::slot_type& cb);
    boost::signals2::connection setButtonLeaveCallback(const button_signal_t::slot_type& cb);
    boost::signals2::connection setButtonRemoveCallback(const button_signal_t::slot_type& cb);

    // append the specified string to end of tooltip
    void setTooltipButtonSuffix(const std::string& suffix) { mButtonTooltipSuffix = suffix; }

    LLToolBarEnums::SideType getSideType() const { return mSideType; }
    bool hasButtons() const { return !mButtons.empty(); }
    bool isModified() const { return mModified; }

    int  getRankFromPosition(S32 x, S32 y);
    int  getRankFromPosition(const LLCommandId& id);

    // Methods used in loading and saving toolbar settings
    void setButtonType(LLToolBarEnums::ButtonType button_type);
    LLToolBarEnums::ButtonType getButtonType() const { return mButtonType; }
    command_id_list_t& getCommandsList() { return mButtonCommands; }
    void clearCommandsList();

private:
    friend class LLUICtrlFactory;
    LLToolBar(const Params&);
    ~LLToolBar();

    void initFromParams(const Params&);
    void createContextMenu();
    void updateLayoutAsNeeded();
    void createButtons();
    void resizeButtonsInRow(std::vector<LLToolBarButton*>& buttons_in_row, S32 max_row_girth);
    bool isSettingChecked(const LLSD& userdata);
    void onSettingEnable(const LLSD& userdata);
    void onRemoveSelectedCommand();

private:
    // static layout state
    const bool                      mReadOnly;
    const LLToolBarEnums::SideType  mSideType;
    const bool                      mWrap;
    const S32                       mPadLeft,
                                    mPadRight,
                                    mPadTop,
                                    mPadBottom,
                                    mPadBetween,
                                    mMinGirth;

    // drag and drop state
    tool_startdrag_callback_t       mStartDragItemCallback;
    tool_handledrag_callback_t      mHandleDragItemCallback;
    tool_handledrop_callback_t      mHandleDropCallback;
    bool                            mDragAndDropTarget;
    int                             mDragRank;
    S32                             mDragx,
                                    mDragy,
                                    mDragGirth;

    typedef std::list<LLToolBarButton*> toolbar_button_list;
    typedef std::map<LLUUID, LLToolBarButton*> command_id_map;
    toolbar_button_list             mButtons;
    command_id_list_t               mButtonCommands;
    command_id_map                  mButtonMap;

    LLToolBarEnums::ButtonType      mButtonType;
    LLToolBarButton::Params         mButtonParams[LLToolBarEnums::BTNTYPE_COUNT];

    // related widgets
    LLLayoutStack*                  mCenteringStack;
    LLCenterLayoutPanel*            mCenterPanel;
    LLPanel*                        mButtonPanel;
    LLHandle<class LLContextMenu>   mPopupMenuHandle;
    LLHandle<class LLView>          mRemoveButtonHandle;

    LLToolBarButton*                mRightMouseTargetButton;

    bool                            mNeedsLayout;
    bool                            mModified;

    button_signal_t*                mButtonAddSignal;
    button_signal_t*                mButtonEnterSignal;
    button_signal_t*                mButtonLeaveSignal;
    button_signal_t*                mButtonRemoveSignal;

    std::string                     mButtonTooltipSuffix;

    LLIconCtrl*                     mCaretIcon;
};


#endif  // LL_LLTOOLBAR_H