/**
 * @file lltoast.cpp
 * @brief This class implements a placeholder for any notification panel.
 *
 * $LicenseInfo:firstyear=2000&license=viewerlgpl$
 * 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 "llviewerprecompiledheaders.h" // must be first include

#include "lltoast.h"

#include "llbutton.h"
#include "llfocusmgr.h"
#include "llnotifications.h"
#include "llviewercontrol.h"

using namespace LLNotificationsUI;
std::list<LLToast*> LLToast::sModalToastsList;

//--------------------------------------------------------------------------
LLToastLifeTimer::LLToastLifeTimer(LLToast* toast, F32 period)
    : mToast(toast),
      LLEventTimer(period)
{
}

/*virtual*/
bool LLToastLifeTimer::tick()
{
    if (mEventTimer.hasExpired())
    {
        mToast->expire();
    }
    return false;
}

void LLToastLifeTimer::stop()
{
    mEventTimer.stop();
}

void LLToastLifeTimer::start()
{
    mEventTimer.start();
}

void LLToastLifeTimer::restart()
{
    mEventTimer.reset();
}

bool LLToastLifeTimer::getStarted()
{
    return mEventTimer.getStarted();
}

void LLToastLifeTimer::setPeriod(F32 period)
{
    mPeriod = period;
}

F32 LLToastLifeTimer::getRemainingTimeF32()
{
    F32 et = mEventTimer.getElapsedTimeF32();
    if (!getStarted() || et > mPeriod) return 0.0f;
    return mPeriod - et;
}

//--------------------------------------------------------------------------
LLToast::Params::Params()
:   can_fade("can_fade", true),
    can_be_stored("can_be_stored", true),
    is_modal("is_modal", false),
    is_tip("is_tip", false),
    enable_hide_btn("enable_hide_btn", true),
    force_show("force_show", false),
    force_store("force_store", false),
    fading_time_secs("fading_time_secs", gSavedSettings.getS32("ToastFadingTime")),
    lifetime_secs("lifetime_secs", gSavedSettings.getS32("NotificationToastLifeTime"))
{};

LLToast::LLToast(const LLToast::Params& p)
:   LLModalDialog(LLSD(), p.is_modal),
    mToastLifetime(p.lifetime_secs),
    mToastFadingTime(p.fading_time_secs),
    mNotificationID(p.notif_id),
    mSessionID(p.session_id),
    mCanFade(p.can_fade),
    mCanBeStored(p.can_be_stored),
    mHideBtnEnabled(p.enable_hide_btn),
    mHideBtn(NULL),
    mPanel(NULL),
    mNotification(p.notification),
    mIsHidden(false),
    mHideBtnPressed(false),
    mIsTip(p.is_tip),
    mWrapperPanel(NULL),
    mIsFading(false),
    mIsHovered(false)
{
    mTimer.reset(new LLToastLifeTimer(this, p.lifetime_secs));

    buildFromFile("panel_toast.xml");

    setCanDrag(false);

    mWrapperPanel = getChild<LLPanel>("wrapper_panel");

    setBackgroundOpaque(true); // *TODO: obsolete
    updateTransparency();

    if(p.panel())
    {
        insertPanel(p.panel);
    }

    if(mHideBtnEnabled)
    {
        mHideBtn = getChild<LLButton>("hide_btn");
        mHideBtn->setClickedCallback(boost::bind(&LLToast::hide,this));
    }

    // init callbacks if present
    if(!p.on_delete_toast().empty())
    {
        mOnDeleteToastSignal.connect(p.on_delete_toast());
    }

    if (isModal())
    {
        sModalToastsList.push_front(this);
    }
}

void LLToast::reshape(S32 width, S32 height, bool called_from_parent)
{
    // We shouldn't  use reshape from LLModalDialog since it changes toasts position.
    // Toasts position should be controlled only by toast screen channel, see LLScreenChannelBase.
    // see EXT-8044
    LLFloater::reshape(width, height, called_from_parent);
}

//--------------------------------------------------------------------------
bool LLToast::postBuild()
{
    if(!mCanFade)
    {
        mTimer->stop();
    }

    return true;
}

//--------------------------------------------------------------------------
void LLToast::setHideButtonEnabled(bool enabled)
{
    if(mHideBtn)
        mHideBtn->setEnabled(enabled);
}

//--------------------------------------------------------------------------
LLToast::~LLToast()
{
    if(LLApp::isQuitting())
    {
        mOnFadeSignal.disconnect_all_slots();
        mOnDeleteToastSignal.disconnect_all_slots();
        mOnToastDestroyedSignal.disconnect_all_slots();
        mOnToastHoverSignal.disconnect_all_slots();
        mToastMouseEnterSignal.disconnect_all_slots();
        mToastMouseLeaveSignal.disconnect_all_slots();
    }
    else
    {
        mOnToastDestroyedSignal(this);
    }

    if (isModal())
    {
        std::list<LLToast*>::iterator iter = std::find(sModalToastsList.begin(), sModalToastsList.end(), this);
        if (iter != sModalToastsList.end())
        {
            sModalToastsList.erase(iter);
        }
    }
}

//--------------------------------------------------------------------------
void LLToast::hide()
{
    if (!mIsHidden)
    {
        setVisible(false);
        setFading(false);
        mTimer->stop();
        mIsHidden = true;
        mOnFadeSignal(this);
    }
}

/*virtual*/
void LLToast::setFocus(bool b)
{
    if (b
        && !hasFocus()
        && mPanel
        && mWrapperPanel
        && !mWrapperPanel->getChildList()->empty())
    {
        LLModalDialog::setFocus(true);
        // mostly for buttons
        mPanel->setFocus(true);
    }
    else
    {
        LLModalDialog::setFocus(b);
    }
}

void LLToast::onFocusLost()
{
    if(mWrapperPanel && !isBackgroundVisible())
    {
        // Lets make wrapper panel behave like a floater
        updateTransparency();
    }
}

void LLToast::onFocusReceived()
{
    if(mWrapperPanel && !isBackgroundVisible())
    {
        // Lets make wrapper panel behave like a floater
        updateTransparency();
    }
}

void LLToast::setLifetime(S32 seconds)
{
    mToastLifetime = seconds;
}

void LLToast::setFadingTime(S32 seconds)
{
    mToastFadingTime = seconds;
}

void LLToast::closeToast()
{
    mOnDeleteToastSignal(this);

    setSoundFlags(SILENT);

    closeFloater();
}

S32 LLToast::getTopPad()
{
    if(mWrapperPanel)
    {
        return getRect().getHeight() - mWrapperPanel->getRect().getHeight();
    }
    return 0;
}

S32 LLToast::getRightPad()
{
    if(mWrapperPanel)
    {
        return getRect().getWidth() - mWrapperPanel->getRect().getWidth();
    }
    return 0;
}

//--------------------------------------------------------------------------
void LLToast::setCanFade(bool can_fade)
{
    mCanFade = can_fade;
    if(!mCanFade)
    {
        mTimer->stop();
    }
}

//--------------------------------------------------------------------------
void LLToast::expire()
{
    if (mCanFade)
    {
        if (mIsFading)
        {
            // Fade timer expired. Time to hide.
            hide();
        }
        else
        {
            // "Life" time has ended. Time to fade.
            setFading(true);
            mTimer->restart();
        }
    }
}

void LLToast::setFading(bool transparent)
{
    mIsFading = transparent;
    updateTransparency();

    if (transparent)
    {
        mTimer->setPeriod(mToastFadingTime);
    }
    else
    {
        mTimer->setPeriod(mToastLifetime);
    }
}

F32 LLToast::getTimeLeftToLive()
{
    F32 time_to_live = mTimer->getRemainingTimeF32();

    if (!mIsFading)
    {
        time_to_live += mToastFadingTime;
    }

    return time_to_live;
}
//--------------------------------------------------------------------------

void LLToast::reshapeToPanel()
{
    LLPanel* panel = getPanel();
    if(!panel)
        return;

    LLRect panel_rect = panel->getLocalRect();
    panel->setShape(panel_rect);

    LLRect toast_rect = getRect();

    toast_rect.setLeftTopAndSize(toast_rect.mLeft, toast_rect.mTop,
        panel_rect.getWidth() + getRightPad(), panel_rect.getHeight() + getTopPad());
    setShape(toast_rect);
}

void LLToast::insertPanel(LLPanel* panel)
{
    mPanel = panel;
    mWrapperPanel->addChild(panel);
    reshapeToPanel();
}

//--------------------------------------------------------------------------
void LLToast::draw()
{
    LLFloater::draw();

    if(!isBackgroundVisible())
    {
        // Floater background is invisible, lets make wrapper panel look like a
        // floater - draw shadow.
        drawShadow(mWrapperPanel);

        // Shadow will probably overlap close button, lets redraw the button
        if(mHideBtn)
        {
            drawChild(mHideBtn);
        }
    }
}

//--------------------------------------------------------------------------
void LLToast::setVisible(bool show)
{
    if(mIsHidden)
    {
        // this toast is invisible after fade until its ScreenChannel will allow it
        //
        // (EXT-1849) according to this bug a toast can be resurrected from
        // invisible state if it faded during a teleportation
        // then it fades a second time and causes a crash
        return;
    }

    if (show && getVisible())
    {
        return;
    }

    if(show)
    {
        if(!mTimer->getStarted() && mCanFade)
        {
            mTimer->start();
        }
    }
    else
    {
        //hide "hide" button in case toast was hidden without mouse_leave
        if(mHideBtn)
            mHideBtn->setVisible(show);
    }
    LLFloater::setVisible(show);
    if (mPanel
        && !mPanel->isDead()
        && mWrapperPanel
        && !mWrapperPanel->getChildList()->empty()
        // LLInspectToast can take over, but LLToast still appears to act like a data storage
        && mPanel->getParent() == mWrapperPanel
        )
    {
        mPanel->setVisible(show);
    }
}

void LLToast::updateHoveredState()
{
    S32 x, y;
    LLUI::getInstance()->getMousePositionScreen(&x, &y);

    LLRect panel_rc = mWrapperPanel->calcScreenRect();
    LLRect button_rc;
    if(mHideBtn)
    {
        button_rc = mHideBtn->calcScreenRect();
    }

    if (!panel_rc.pointInRect(x, y) && !button_rc.pointInRect(x, y))
    {
        // mouse is not over this toast
        mIsHovered = false;
    }
    else
    {
        bool is_overlapped_by_other_floater = false;

        const child_list_t* child_list = gFloaterView->getChildList();

        // find this toast in gFloaterView child list to check whether any floater
        // with higher Z-order is visible under the mouse pointer overlapping this toast
        child_list_const_reverse_iter_t r_iter = std::find(child_list->rbegin(), child_list->rend(), this);
        if (r_iter != child_list->rend())
        {
            // skip this toast and proceed to views above in Z-order
            for (++r_iter; r_iter != child_list->rend(); ++r_iter)
            {
                LLView* view = *r_iter;
                is_overlapped_by_other_floater = view->isInVisibleChain() && view->calcScreenRect().pointInRect(x, y);
                if (is_overlapped_by_other_floater)
                {
                    break;
                }
            }
        }

        mIsHovered = !is_overlapped_by_other_floater;
    }

    LLToastLifeTimer* timer = getTimer();

    if (timer)
    {
        // Started timer means the mouse had left the toast previously.
        // If toast is hovered in the current frame we should handle
        // a mouse enter event.
        if(timer->getStarted() && mIsHovered)
        {
            mOnToastHoverSignal(this, MOUSE_ENTER);

            updateTransparency();

            //toasts fading is management by Screen Channel

            sendChildToFront(mHideBtn);
            if(mHideBtn && mHideBtn->getEnabled())
            {
                mHideBtn->setVisible(true);
            }

            mToastMouseEnterSignal(this, getValue());
        }
        // Stopped timer means the mouse had entered the toast previously.
        // If the toast is not hovered in the current frame we should handle
        // a mouse leave event.
        else if(!timer->getStarted() && !mIsHovered)
        {
            mOnToastHoverSignal(this, MOUSE_LEAVE);

            updateTransparency();

            //toasts fading is management by Screen Channel

            if(mHideBtn && mHideBtn->getEnabled())
            {
                if( mHideBtnPressed )
                {
                    mHideBtnPressed = false;
                    return;
                }
                mHideBtn->setVisible(false);
            }

            mToastMouseLeaveSignal(this, getValue());
        }
    }
}

void LLToast::setBackgroundOpaque(bool b)
{
    if(mWrapperPanel && !isBackgroundVisible())
    {
        mWrapperPanel->setBackgroundOpaque(b);
    }
    else
    {
        LLModalDialog::setBackgroundOpaque(b);
    }
}

void LLToast::updateTransparency()
{
    ETypeTransparency transparency_type;

    if (mCanFade)
    {
        // Notification toasts (including IM/chat toasts) change their transparency on hover.
        if (isHovered())
        {
            transparency_type = TT_ACTIVE;
        }
        else
        {
            transparency_type = mIsFading ? TT_FADING : TT_INACTIVE;
        }
    }
    else
    {
        // Transparency of alert toasts depends on focus.
        transparency_type = hasFocus() ? TT_ACTIVE : TT_INACTIVE;
    }

    LLFloater::updateTransparency(transparency_type);
}

void LLNotificationsUI::LLToast::stopTimer()
{
    if(mCanFade)
    {
        setFading(false);
        mTimer->stop();
    }
}

void LLNotificationsUI::LLToast::startTimer()
{
    if(mCanFade)
    {
        setFading(false);
        mTimer->start();
    }
}

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

bool LLToast::handleMouseDown(S32 x, S32 y, MASK mask)
{
    if(mHideBtn && mHideBtn->getEnabled())
    {
        mHideBtnPressed = mHideBtn->getRect().pointInRect(x, y);
    }

    return LLModalDialog::handleMouseDown(x, y, mask);
}

//--------------------------------------------------------------------------
bool LLToast::isNotificationValid()
{
    if(mNotification)
    {
        return !mNotification->isCancelled();
    }
    return false;
}

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

S32 LLToast::notifyParent(const LLSD& info)
{
    if (info.has("action") && "hide_toast" == info["action"].asString())
    {
        hide();
        return 1;
    }

    return LLModalDialog::notifyParent(info);
}

//static
void LLToast::updateClass()
{
    for (auto& toast : LLInstanceTracker<LLToast>::instance_snapshot())
    {
        toast.updateHoveredState();
    }
}

// static
void LLToast::cleanupToasts()
{
    LLInstanceTracker<LLToast>::instance_snapshot().deleteAll();
}