/**
 * @file llfloaterregionrestarting.cpp
 * @brief Shows countdown timer during region restart
 *
 * $LicenseInfo:firstyear=2006&license=viewerlgpl$
 * 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"

#include "llfloaterregionrestarting.h"

#include "llfloaterreg.h"
#include "lluictrl.h"
#include "llagent.h"
#include "llagentcamera.h"
#include "llviewerwindow.h"

static S32 sSeconds;
static U32 sShakeState;

LLFloaterRegionRestarting::LLFloaterRegionRestarting(const LLSD& key) :
    LLFloater(key),
    LLEventTimer(1)
{
    mName = (std::string)key["NAME"];
    sSeconds = (LLSD::Integer)key["SECONDS"];
}

LLFloaterRegionRestarting::~LLFloaterRegionRestarting()
{
    mRegionChangedConnection.disconnect();
}

bool LLFloaterRegionRestarting::postBuild()
{
    mRegionChangedConnection = gAgent.addRegionChangedCallback(boost::bind(&LLFloaterRegionRestarting::regionChange, this));

    LLStringUtil::format_map_t args;
    std::string text;

    args["[NAME]"] = mName;
    text = getString("RegionName", args);
    LLTextBox* textbox = getChild<LLTextBox>("region_name");
    textbox->setValue(text);

    sShakeState = SHAKE_START;

    refresh();

    return true;
}

void LLFloaterRegionRestarting::regionChange()
{
    close();
}

bool LLFloaterRegionRestarting::tick()
{
    refresh();

    return false;
}

void LLFloaterRegionRestarting::refresh()
{
    LLStringUtil::format_map_t args;
    std::string text;

    args["[SECONDS]"] = llformat("%d", sSeconds);
    getChild<LLTextBox>("restart_seconds")->setValue(getString("RestartSeconds", args));

    sSeconds = sSeconds - 1;
    if(sSeconds < 0.0)
    {
        sSeconds = 0;
    }
}

void LLFloaterRegionRestarting::draw()
{
    LLFloater::draw();

    const F32 SHAKE_INTERVAL = 0.025;
    const F32 SHAKE_TOTAL_DURATION = 1.8; // the length of the default alert tone for this
    const F32 SHAKE_INITIAL_MAGNITUDE = 1.5;
    const F32 SHAKE_HORIZONTAL_BIAS = 0.25;
    F32 time_shaking;

    if(SHAKE_START == sShakeState)
    {
            mShakeTimer.setTimerExpirySec(SHAKE_INTERVAL);
            sShakeState = SHAKE_LEFT;
            mShakeIterations = 0;
            mShakeMagnitude = SHAKE_INITIAL_MAGNITUDE;
    }

    if(SHAKE_DONE != sShakeState && mShakeTimer.hasExpired())
    {
        gAgentCamera.unlockView();

        switch(sShakeState)
        {
            case SHAKE_LEFT:
                gAgentCamera.setPanLeftKey(mShakeMagnitude * SHAKE_HORIZONTAL_BIAS);
                sShakeState = SHAKE_UP;
                break;

            case SHAKE_UP:
                gAgentCamera.setPanUpKey(mShakeMagnitude);
                sShakeState = SHAKE_RIGHT;
                break;

            case SHAKE_RIGHT:
                gAgentCamera.setPanRightKey(mShakeMagnitude * SHAKE_HORIZONTAL_BIAS);
                sShakeState = SHAKE_DOWN;
                break;

            case SHAKE_DOWN:
                gAgentCamera.setPanDownKey(mShakeMagnitude);
                mShakeIterations++;
                time_shaking = SHAKE_INTERVAL * (mShakeIterations * 4 /* left, up, right, down */);
                if(SHAKE_TOTAL_DURATION <= time_shaking)
                {
                    sShakeState = SHAKE_DONE;
                    mShakeMagnitude = 0.0;
                }
                else
                {
                    sShakeState = SHAKE_LEFT;
                    F32 percent_done_shaking = (SHAKE_TOTAL_DURATION - time_shaking) / SHAKE_TOTAL_DURATION;
                    mShakeMagnitude = SHAKE_INITIAL_MAGNITUDE * (percent_done_shaking * percent_done_shaking); // exponential decay
                }
                break;

            default:
                break;
        }
        mShakeTimer.setTimerExpirySec(SHAKE_INTERVAL);
    }
}

void LLFloaterRegionRestarting::close()
{
    LLFloaterRegionRestarting* floaterp = LLFloaterReg::findTypedInstance<LLFloaterRegionRestarting>("region_restarting");

    if (floaterp)
    {
        floaterp->closeFloater();
    }
}

void LLFloaterRegionRestarting::updateTime(S32 time)
{
    sSeconds = time;
    sShakeState = SHAKE_START;
}