/**
 * @file llui.h
 * @brief General static UI services.
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * 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 LL_LLUI_H
#define LL_LLUI_H

#include "llrect.h"
#include "llcoord.h"
#include "llcontrol.h"
#include "llcoord.h"
#include "llcontrol.h"
#include "llinitparam.h"
#include "llregistry.h"
#include "llrender2dutils.h"
#include "llpointer.h"
#include "lluicolor.h"
#include "lluicolortable.h"
#include "lluiimage.h"
#include <boost/signals2.hpp>
#include "llframetimer.h"
#include "v2math.h"
#include <limits>

// for initparam specialization
#include "llfontgl.h"

class LLUUID;
class LLWindow;
class LLView;
class LLHelp;

const S32 DRAG_N_DROP_DISTANCE_THRESHOLD = 3;
// this enum is used by the llview.h (viewer) and the llassetstorage.h (viewer and sim)
enum EDragAndDropType
{
    DAD_NONE            = 0,
    DAD_TEXTURE         = 1,
    DAD_SOUND           = 2,
    DAD_CALLINGCARD     = 3,
    DAD_LANDMARK        = 4,
    DAD_SCRIPT          = 5,
    DAD_CLOTHING        = 6,
    DAD_OBJECT          = 7,
    DAD_NOTECARD        = 8,
    DAD_CATEGORY        = 9,
    DAD_ROOT_CATEGORY   = 10,
    DAD_BODYPART        = 11,
    DAD_ANIMATION       = 12,
    DAD_GESTURE         = 13,
    DAD_LINK            = 14,
    DAD_MESH            = 15,
    DAD_WIDGET          = 16,
    DAD_PERSON          = 17,
    DAD_SETTINGS        = 18,
    DAD_MATERIAL        = 19,
    DAD_COUNT           = 20,   // number of types in this enum
};

// Reasons for drags to be denied.
// ordered by priority for multi-drag
enum EAcceptance
{
    ACCEPT_POSTPONED,   // we are asynchronously determining acceptance
    ACCEPT_NO,          // Uninformative, general purpose denial.
    ACCEPT_NO_CUSTOM,   // Denial with custom message.
    ACCEPT_NO_LOCKED,   // Operation would be valid, but permissions are set to disallow it.
    ACCEPT_YES_COPY_SINGLE, // We'll take a copy of a single item
    ACCEPT_YES_SINGLE,      // Accepted. OK to drag and drop single item here.
    ACCEPT_YES_COPY_MULTI,  // We'll take a copy of multiple items
    ACCEPT_YES_MULTI        // Accepted. OK to drag and drop multiple items here.
};

enum EAddPosition
{
    ADD_TOP,
    ADD_BOTTOM,
    ADD_DEFAULT
};


void make_ui_sound(const char* name);
void make_ui_sound_deferred(const char * name);

class LLImageProviderInterface;

typedef void (*LLUIAudioCallback)(const LLUUID& uuid);

class LLUI : public LLParamSingleton<LLUI>
{
public:
    typedef std::map<std::string, LLControlGroup*> settings_map_t;

private:
    LLSINGLETON(LLUI , const settings_map_t &settings,
                           LLImageProviderInterface* image_provider,
                           LLUIAudioCallback audio_callback,
                           LLUIAudioCallback deferred_audio_callback);
    LOG_CLASS(LLUI);
public:
    //
    // Classes
    //

    struct RangeS32
    {
        struct Params : public LLInitParam::Block<Params>
        {
            Optional<S32>   minimum,
                            maximum;

            Params()
            :   minimum("min", 0),
                maximum("max", S32_MAX)
            {}
        };

        // correct for inverted params
        RangeS32(const Params& p = Params())
        :   mMin(p.minimum),
            mMax(p.maximum)
        {
            sanitizeRange();
        }

        RangeS32(S32 minimum, S32 maximum)
        :   mMin(minimum),
            mMax(maximum)
        {
            sanitizeRange();
        }

        S32 clamp(S32 input)
        {
            if (input < mMin) return mMin;
            if (input > mMax) return mMax;
            return input;
        }

        void setRange(S32 minimum, S32 maximum)
        {
            mMin = minimum;
            mMax = maximum;
            sanitizeRange();
        }

        S32 getMin() { return mMin; }
        S32 getMax() { return mMax; }

        bool operator==(const RangeS32& other) const
        {
            return mMin == other.mMin
                && mMax == other.mMax;
        }
    private:
        void sanitizeRange()
        {
            if (mMin > mMax)
            {
                LL_WARNS() << "Bad interval range (" << mMin << ", " << mMax << ")" << LL_ENDL;
                // since max is usually the most dangerous one to ignore (buffer overflow, etc), prefer it
                // in the case of a malformed range
                mMin = mMax;
            }
        }


        S32 mMin,
            mMax;
    };

    struct ClampedS32 : public RangeS32
    {
        struct Params : public LLInitParam::Block<Params, RangeS32::Params>
        {
            Mandatory<S32> value;

            Params()
            :   value("", 0)
            {
                addSynonym(value, "value");
            }
        };

        ClampedS32(const Params& p)
        :   RangeS32(p)
        {}

        ClampedS32(const RangeS32& range)
        :   RangeS32(range)
        {
            // set value here, after range has been sanitized
            mValue = clamp(0);
        }

        ClampedS32(S32 value, const RangeS32& range = RangeS32())
        :   RangeS32(range)
        {
            mValue = clamp(value);
        }

        S32 get()
        {
            return mValue;
        }

        void set(S32 value)
        {
            mValue = clamp(value);
        }


    private:
        S32 mValue{ 0 };
    };

    //
    // Methods
    //
    typedef boost::function<void(LLView*)> add_popup_t;
    typedef boost::function<void(LLView*)> remove_popup_t;
    typedef boost::function<void(void)> clear_popups_t;

    void setPopupFuncs(const add_popup_t& add_popup, const remove_popup_t&, const clear_popups_t& );

    // Return the ISO639 language name ("en", "ko", etc.) for the viewer UI.
    // http://www.loc.gov/standards/iso639-2/php/code_list.php
    std::string getUILanguage();
    static std::string getLanguage(); // static for lldateutil_test compatibility

    //helper functions (should probably move free standing rendering helper functions here)
    LLView* getRootView() { return mRootView; }
    void setRootView(LLView* view) { mRootView = view; }
    /**
     * Walk the LLView tree to resolve a path
     * Paths can be discovered using Develop > XUI > Show XUI Paths
     *
     * A leading "/" indicates the root of the tree is the starting
     * position of the search, (otherwise the context node is used)
     *
     * Adjacent "//" mean that the next level of the search is done
     * recursively ("descendant" rather than "child").
     *
     * Return values: If no match is found, NULL is returned,
     * otherwise the matching LLView* is returned.
     *
     * Examples:
     *
     * "/" -> return the root view
     * "/foo" -> find "foo" as a direct child of the root
     * "foo" -> find "foo" as a direct child of the context node
     * "//foo" -> find the first "foo" child anywhere in the tree
     * "/foo/bar" -> find "foo" as direct child of the root, and
     *      "bar" as a direct child of "foo"
     * "//foo//bar/baz" -> find the first "foo" anywhere in the
     *      tree, the first "bar" anywhere under it, and "baz"
     *      as a direct child of that
     */
    const LLView* resolvePath(const LLView* context, const std::string& path);
    LLView* resolvePath(LLView* context, const std::string& path);
    static std::string locateSkin(const std::string& filename);
    void setMousePositionScreen(S32 x, S32 y);
    void getMousePositionScreen(S32 *x, S32 *y);
    void setMousePositionLocal(const LLView* viewp, S32 x, S32 y);
    void getMousePositionLocal(const LLView* viewp, S32 *x, S32 *y);
    LLVector2 getWindowSize();
    void screenPointToGL(S32 screen_x, S32 screen_y, S32 *gl_x, S32 *gl_y);
    void glPointToScreen(S32 gl_x, S32 gl_y, S32 *screen_x, S32 *screen_y);
    void screenRectToGL(const LLRect& screen, LLRect *gl);
    void glRectToScreen(const LLRect& gl, LLRect *screen);
    // Returns the control group containing the control name, or the default group
    LLControlGroup& getControlControlGroup (const std::string& controlname);
    F32 getMouseIdleTime() { return mMouseIdleTimer.getElapsedTimeF32(); }
    void resetMouseIdleTimer() { mMouseIdleTimer.reset(); }
    LLWindow* getWindow() { return mWindow; }

    void addPopup(LLView*);
    void removePopup(LLView*);
    void clearPopups();

    void reportBadKeystroke();

    // Ensures view does not overlap mouse cursor, but is inside
    // the view's parent rectangle.  Used for tooltips, inspectors.
    // Optionally override the view's default X/Y, which are relative to the
    // view's parent.
    void positionViewNearMouse(LLView* view,    S32 spawn_x = S32_MAX, S32 spawn_y = S32_MAX);

    // LLRender2D wrappers
    static void pushMatrix() { LLRender2D::pushMatrix(); }
    static void popMatrix() { LLRender2D::popMatrix(); }
    static void loadIdentity() { LLRender2D::loadIdentity(); }
    static void translate(F32 x, F32 y, F32 z = 0.0f) { LLRender2D::translate(x, y, z); }

    static LLVector2& getScaleFactor();
    static void setScaleFactor(const LLVector2& scale_factor);
    static void setLineWidth(F32 width) { LLRender2D::setLineWidth(width); }
    static LLPointer<LLUIImage> getUIImageByID(const LLUUID& image_id, S32 priority = 0)
        { return LLRender2D::getInstance()->getUIImageByID(image_id, priority); }
    static LLPointer<LLUIImage> getUIImage(const std::string& name, S32 priority = 0)
        { return LLRender2D::getInstance()->getUIImage(name, priority); }

    //
    // Data
    //
    settings_map_t mSettingGroups;
    LLUIAudioCallback mAudioCallback;
    LLUIAudioCallback mDeferredAudioCallback;
    LLWindow*       mWindow;
    LLView*         mRootView;
    LLHelp*         mHelpImpl;
private:
    std::vector<std::string> mXUIPaths;
    LLFrameTimer        mMouseIdleTimer;
    add_popup_t     mAddPopupFunc;
    remove_popup_t  mRemovePopupFunc;
    clear_popups_t  mClearPopupsFunc;
};


// Moved LLLocalClipRect to lllocalcliprect.h

// useful parameter blocks
struct TimeIntervalParam : public LLInitParam::ChoiceBlock<TimeIntervalParam>
{
    Alternative<F32>        seconds;
    Alternative<S32>        frames;
    TimeIntervalParam()
    :   seconds("seconds"),
        frames("frames")
    {}
};

template <class T>
class LLUICachedControl : public LLCachedControl<T>
{
public:
    // This constructor will declare a control if it doesn't exist in the contol group
    LLUICachedControl(const std::string& name,
                      const T& default_value,
                      const std::string& comment = "Declared In Code")
    :   LLCachedControl<T>(LLUI::getInstance()->getControlControlGroup(name), name, default_value, comment)
    {}
};

namespace LLInitParam
{
    template<>
    class ParamValue<LLRect>
    :   public CustomParamValue<LLRect>
    {
        typedef CustomParamValue<LLRect> super_t;
    public:
        Optional<S32>   left,
                        top,
                        right,
                        bottom,
                        width,
                        height;

        ParamValue(const LLRect& value);

        void updateValueFromBlock();
        void updateBlockFromValue(bool make_block_authoritative);
    };

    template<>
    class ParamValue<LLUIColor>
    :   public CustomParamValue<LLUIColor>
    {
        typedef CustomParamValue<LLUIColor> super_t;

    public:
        Optional<F32>           red,
                                green,
                                blue,
                                alpha;
        Optional<std::string>   control;

        ParamValue(const LLUIColor& color);
        void updateValueFromBlock();
        void updateBlockFromValue(bool make_block_authoritative);
    };

    template<>
    class ParamValue<const LLFontGL*>
    :   public CustomParamValue<const LLFontGL* >
    {
        typedef CustomParamValue<const LLFontGL*> super_t;
    public:
        Optional<std::string>   name,
                                size,
                                style;

        ParamValue(const LLFontGL* value);
        void updateValueFromBlock();
        void updateBlockFromValue(bool make_block_authoritative);
    };

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

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

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

    template<>
    struct ParamCompare<const LLFontGL*, false>
    {
        static bool equals(const LLFontGL* a, const LLFontGL* b);
    };


    template<>
    class ParamValue<LLCoordGL>
    :   public CustomParamValue<LLCoordGL>
    {
        typedef CustomParamValue<LLCoordGL> super_t;
    public:
        Optional<S32>   x,
                        y;

        ParamValue(const LLCoordGL& val);
        void updateValueFromBlock();
        void updateBlockFromValue(bool make_block_authoritative);
    };
}

#endif