/**
 * @file llbadge.cpp
 * @brief Implementation for badges
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * 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
 * $/LicenseInfo$
 */

#define LLBADGE_CPP
#include "llbadge.h"

#include "llfontgl.h"
#include "llfontvertexbuffer.h"
#include "llscrollcontainer.h"
#include "lluictrlfactory.h"


static LLDefaultChildRegistry::Register<LLBadge> r("badge");

static const S32 BADGE_OFFSET_NOT_SPECIFIED = 0x7FFFFFFF;

// Compiler optimization, generate extern template
template class LLBadge* LLView::getChild<class LLBadge>(std::string_view name, bool recurse) const;


LLBadge::Params::Params()
    : image("image")
    , border_image("border_image")
    , border_color("border_color")
    , image_color("image_color")
    , label("label")
    , label_color("label_color")
    , label_offset_horiz("label_offset_horiz")
    , label_offset_vert("label_offset_vert")
    , location("location", LLRelPos::TOP_LEFT)
    , location_offset_hcenter("location_offset_hcenter")
    , location_offset_vcenter("location_offset_vcenter")
    , location_percent_hcenter("location_percent_hcenter")
    , location_percent_vcenter("location_percent_vcenter")
    , padding_horiz("padding_horiz")
    , padding_vert("padding_vert")
{}

bool LLBadge::Params::equals(const Params& a) const
{
    bool comp = true;

    // skip owner in comparison on purpose

    comp &= (border_image() == a.border_image());
    comp &= (border_color() == a.border_color());
    comp &= (image() == a.image());
    comp &= (image_color() == a.image_color());
    comp &= (label() == a.label());
    comp &= (label_color() == a.label_color());
    comp &= (label_offset_horiz() == a.label_offset_horiz());
    comp &= (label_offset_vert() == a.label_offset_vert());
    comp &= (location() == a.location());
    comp &= (location_offset_hcenter() == a.location_offset_hcenter());
    comp &= (location_offset_vcenter() == a.location_offset_vcenter());
    comp &= (location_percent_hcenter() == a.location_percent_hcenter());
    comp &= (location_percent_vcenter() == a.location_percent_vcenter());
    comp &= (padding_horiz() == a.padding_horiz());
    comp &= (padding_vert() == a.padding_vert());

    return comp;
}

LLBadge::LLBadge(const LLBadge::Params& p)
    : LLUICtrl(p)
    , mOwner(p.owner)
    , mBorderImage(p.border_image)
    , mBorderColor(p.border_color)
    , mGLFont(p.font)
    , mImage(p.image)
    , mImageColor(p.image_color)
    , mLabel(p.label)
    , mLabelColor(p.label_color)
    , mLabelOffsetHoriz(p.label_offset_horiz)
    , mLabelOffsetVert(p.label_offset_vert)
    , mLocation(p.location)
    , mLocationOffsetHCenter(BADGE_OFFSET_NOT_SPECIFIED)
    , mLocationOffsetVCenter(BADGE_OFFSET_NOT_SPECIFIED)
    , mLocationPercentHCenter(0.5f)
    , mLocationPercentVCenter(0.5f)
    , mPaddingHoriz(p.padding_horiz)
    , mPaddingVert(p.padding_vert)
    , mParentScroller(NULL)
    , mDrawAtParentTop(false)
{
    if (mImage.isNull())
    {
        LL_WARNS() << "Badge: " << getName() << " with no image!" << LL_ENDL;
    }

    if (p.location_offset_hcenter.isProvided())
    {
        mLocationOffsetHCenter = p.location_offset_hcenter();
    }

    if (p.location_offset_vcenter.isProvided())
    {
        mLocationOffsetVCenter = p.location_offset_vcenter();
    }

    //
    // The following logic is to set the mLocationPercentHCenter and mLocationPercentVCenter
    // based on the Location enum and our horizontal and vertical location percentages.  The
    // draw code then uses this on the owner rectangle to compute the screen location for
    // the badge.
    //

    if (!LLRelPos::IsCenter(mLocation))
    {
        F32 h_center = p.location_percent_hcenter * 0.01f;
        F32 v_center = p.location_percent_vcenter * 0.01f;

        if (LLRelPos::IsRight(mLocation))
        {
            mLocationPercentHCenter = 0.5f * (1.0f + h_center);
        }
        else if (LLRelPos::IsLeft(mLocation))
        {
            mLocationPercentHCenter = 0.5f * (1.0f - h_center);
        }

        if (LLRelPos::IsTop(mLocation))
        {
            mLocationPercentVCenter = 0.5f * (1.0f + v_center);
        }
        else if (LLRelPos::IsBottom(mLocation))
        {
            mLocationPercentVCenter = 0.5f * (1.0f - v_center);
        }
    }
}

LLBadge::~LLBadge()
{
}

bool LLBadge::addToView(LLView * view)
{
    bool child_added = view->addChild(this);

    if (child_added)
    {
        setShape(view->getLocalRect());

        // Find a parent scroll container, if there is one in case we need it for positioning

        LLView * parent = mOwner.get();

        while ((parent != NULL) && ((mParentScroller = dynamic_cast<LLScrollContainer *>(parent)) == NULL))
        {
            parent = parent->getParent();
        }
    }

    return child_added;
}

void LLBadge::setLabel(const LLStringExplicit& label)
{
    mLabel = label;
}

//
// This is a fallback function to render a rectangle for badges without a valid image
//
void renderBadgeBackground(F32 centerX, F32 centerY, F32 width, F32 height, const LLColor4U &color)
{
    gGL.pushUIMatrix();
    gGL.loadUIIdentity();
    gGL.setSceneBlendType(LLRender::BT_REPLACE);
    gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);

    gGL.color4ubv(color.mV);
    gGL.texCoord2i(0, 0);

    F32 x = LLFontGL::sCurOrigin.mX + centerX - width * 0.5f;
    F32 y = LLFontGL::sCurOrigin.mY + centerY - height * 0.5f;

    LLRectf screen_rect((F32)ll_round(x),
                        (F32)ll_round(y),
                        (F32)ll_round(x) + width,
                        (F32)ll_round(y) + height);

    LLVector4a vertices[4];
    vertices[0].set(screen_rect.mLeft,  screen_rect.mTop,    1.0f);
    vertices[1].set(screen_rect.mRight, screen_rect.mTop,    1.0f);
    vertices[2].set(screen_rect.mLeft,  screen_rect.mBottom, 1.0f);
    vertices[3].set(screen_rect.mRight, screen_rect.mBottom, 1.0f);

    gGL.begin(LLRender::TRIANGLE_STRIP);
    {
        gGL.vertexBatchPreTransformed(vertices, 4);
    }
    gGL.end();

    gGL.popUIMatrix();
}


// virtual
void LLBadge::draw()
{
    if (!mLabel.empty())
    {
        LLView* owner_view = mOwner.get();

        if (owner_view && owner_view->isInVisibleChain())
        {
            //
            // Calculate badge size based on label text
            //

            S32 badge_label_begin_offset = 0;
            S32 badge_char_length = S32_MAX;
            S32 badge_pixel_length = S32_MAX;
            F32 *right_position_out = NULL;
            bool do_not_use_ellipses = false;

            F32 badge_width = (2.0f * mPaddingHoriz) +
                mGLFont->getWidthF32(mLabel.getWString().c_str(), badge_label_begin_offset, badge_char_length);

            F32 badge_height = (2.0f * mPaddingVert) + mGLFont->getLineHeight();

            //
            // Calculate badge position based on owner
            //

            LLRect owner_rect;
            owner_view->localRectToOtherView(owner_view->getLocalRect(), & owner_rect, this);

            S32 location_offset_horiz = mLocationOffsetHCenter;
            S32 location_offset_vert = mLocationOffsetVCenter;

            // If we're in a scroll container, do some math to keep us in the same place on screen if applicable
            if (mParentScroller != NULL)
            {
                LLRect visibleRect = mParentScroller->getVisibleContentRect();

                if (mLocationOffsetHCenter != BADGE_OFFSET_NOT_SPECIFIED)
                {
                    if (LLRelPos::IsRight(mLocation))
                    {
                        location_offset_horiz += visibleRect.mRight;
                    }
                    else if (LLRelPos::IsLeft(mLocation))
                    {
                        location_offset_horiz += visibleRect.mLeft;
                    }
                    else // center
                    {
                        location_offset_horiz += (visibleRect.mLeft + visibleRect.mRight) / 2;
                    }
                }

                if (mLocationOffsetVCenter != BADGE_OFFSET_NOT_SPECIFIED)
                {
                    if (LLRelPos::IsTop(mLocation))
                    {
                        location_offset_vert += visibleRect.mTop;
                    }
                    else if (LLRelPos::IsBottom(mLocation))
                    {
                        location_offset_vert += visibleRect.mBottom;
                    }
                    else // center
                    {
                        location_offset_vert += (visibleRect.mBottom + visibleRect.mTop) / 2;
                    }
                }
            }

            F32 badge_center_x;
            F32 badge_center_y;

            // Compute x position
            if (mLocationOffsetHCenter == BADGE_OFFSET_NOT_SPECIFIED)
            {
                badge_center_x = owner_rect.mLeft + owner_rect.getWidth() * mLocationPercentHCenter;
            }
            else
            {
                badge_center_x = (F32)location_offset_horiz;
            }

            // Compute y position
            if (mLocationOffsetVCenter == BADGE_OFFSET_NOT_SPECIFIED)
            {
                if(mDrawAtParentTop)
                {
                    badge_center_y = owner_rect.mTop - badge_height * 0.5f - 1;
                }
                else
                {
                    badge_center_y = owner_rect.mBottom + owner_rect.getHeight() * mLocationPercentVCenter;
                }
            }
            else
            {
                badge_center_y = (F32)location_offset_vert;
            }

            //
            // Draw button image, if available.
            // Otherwise draw basic rectangular button.
            //

            F32 alpha = getDrawContext().mAlpha;

            if (!mImage.isNull())
            {
                F32 badge_x = badge_center_x - badge_width * 0.5f;
                F32 badge_y = badge_center_y - badge_height * 0.5f;

                mImage->drawSolid((S32) badge_x, (S32) badge_y, (S32) badge_width, (S32) badge_height, mImageColor % alpha);

                if (!mBorderImage.isNull())
                {
                    mBorderImage->drawSolid((S32) badge_x, (S32) badge_y, (S32) badge_width, (S32) badge_height, mBorderColor % alpha);
                }
            }
            else
            {
                LL_DEBUGS() << "No image for badge " << getName() << " on owner " << owner_view->getName() << LL_ENDL;

                renderBadgeBackground(badge_center_x, badge_center_y,
                                      badge_width, badge_height,
                                      mImageColor % alpha);
            }

            //
            // Draw the label
            //
            mFontBuffer.render(mGLFont,
                               mLabel.getWString(),
                               badge_label_begin_offset,
                               badge_center_x + mLabelOffsetHoriz,
                               badge_center_y + mLabelOffsetVert,
                               mLabelColor % alpha,
                               LLFontGL::HCENTER, LLFontGL::VCENTER, // centered around the position
                               LLFontGL::NORMAL, // normal text (not bold, italics, etc.)
                               LLFontGL::DROP_SHADOW_SOFT,
                               badge_char_length, badge_pixel_length,
                               right_position_out, do_not_use_ellipses);
        }
    }
}


namespace LLInitParam
{
    void TypeValues<LLRelPos::Location>::declareValues()
    {
        declare("bottom",       LLRelPos::BOTTOM);
        declare("bottom_left",  LLRelPos::BOTTOM_LEFT);
        declare("bottom_right", LLRelPos::BOTTOM_RIGHT);
        declare("center",       LLRelPos::CENTER);
        declare("left",         LLRelPos::LEFT);
        declare("right",        LLRelPos::RIGHT);
        declare("top",          LLRelPos::TOP);
        declare("top_left",     LLRelPos::TOP_LEFT);
        declare("top_right",    LLRelPos::TOP_RIGHT);
    }
}


// eof