/**
  ******************************************************************************
  * This file is part of the TouchGFX 4.10.0 distribution.
  *
  * <h2><center>&copy; Copyright (c) 2018 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under Ultimate Liberty license
  * SLA0044, the "License"; You may not use this file except in compliance with
  * the License. You may obtain a copy of the License at:
  *                             www.st.com/SLA0044
  *
  ******************************************************************************
  */

#include <touchgfx/containers/scrollers/ScrollBase.hpp>

namespace touchgfx
{
ScrollBase::ScrollBase()
    : Container(),
      numberOfDrawables(0),
      distanceBeforeAlignedItem(0),
      itemSize(0),
      swipeAcceleration(10),
      dragAcceleration(10),
      maxSwipeItems(0),
      easingEquation(&EasingEquations::backEaseOut),
      defaultAnimationSteps(30),
      itemSelectedCallback(0),
      itemLockedInCallback(0),
      animationEndedCallback(0),
      itemPressedCallback(0),
      currentAnimationState(NO_ANIMATION),
      gestureStep(0),
      gestureStepsTotal(0),
      gestureStart(0),
      gestureEnd(0),
      xClick(0),
      yClick(0),
      initialSwipeOffset(0),
      draggableX(false),
      draggableY(false)
{
    add(list);
    list.setXY(0, 0);
    list.setHorizontal(false);
    list.setCircular(false);
    setTouchable(true);
}

void ScrollBase::setWidth(int16_t width)
{
    Container::setWidth(width);
    list.setWidth(width);
}

void ScrollBase::setHeight(int16_t height)
{
    Container::setHeight(height);
    list.setHeight(height);
}

void ScrollBase::setHorizontal(bool horizontal)
{
    allowVerticalDrag(horizontal);
    allowHorizontalDrag(!horizontal);
    list.setHorizontal(horizontal);
}

bool ScrollBase::getHorizontal() const
{
    return list.getHorizontal();
}

void ScrollBase::setCircular(bool circular)
{
    list.setCircular(circular);
}

bool ScrollBase::getCircular() const
{
    return list.getCircular();
}

void ScrollBase::setDrawableSize(int16_t drawableSize, int16_t drawableMargin)
{
    itemSize = drawableSize + drawableMargin * 2;
    list.setDrawableSize(drawableSize, drawableMargin);
}

int16_t ScrollBase::getDrawableSize() const
{
    return list.getDrawableSize();
}

int16_t ScrollBase::getDrawableMargin() const
{
    return list.getDrawableMargin();
}

void ScrollBase::setNumberOfItems(int16_t numberOfItems)
{
    if (numberOfItems != getNumberOfItems())
    {
        list.setNumberOfItems(numberOfItems);
        if (!getCircular())
        {
            animateToPosition(keepOffsetInsideLimits(getOffset(), 0));
        }
    }
}

int16_t ScrollBase::getNumberOfItems() const
{
    return list.getNumberOfItems();
}

void ScrollBase::setEasingEquation(EasingEquation equation)
{
    easingEquation = equation;
}

void ScrollBase::setAnimationSteps(int16_t steps)
{
    defaultAnimationSteps = steps;
}

uint16_t ScrollBase::getAnimationSteps() const
{
    return defaultAnimationSteps;
}

void ScrollBase::setSwipeAcceleration(uint16_t acceleration)
{
    swipeAcceleration = acceleration;
}

uint16_t ScrollBase::getSwipeAcceleration() const
{
    return swipeAcceleration;
}

void ScrollBase::setMaxSwipeItems(uint16_t maxItems)
{
    maxSwipeItems = maxItems;
}

uint16_t ScrollBase::getMaxSwipeItems() const
{
    return maxSwipeItems;
}

void ScrollBase::setDragAcceleration(uint16_t acceleration)
{
    dragAcceleration = acceleration;
}

uint16_t ScrollBase::getDragAcceleration() const
{
    return dragAcceleration;
}

void ScrollBase::allowHorizontalDrag(bool enable)
{
    draggableX = enable;
}

void ScrollBase::allowVerticalDrag(bool enable)
{
    draggableY = enable;
}

void ScrollBase::animateToItem(int16_t itemIndex, int16_t animationSteps /*= -1*/)
{
    int32_t position = getPositionForItem(itemIndex);
    animateToPosition(position, animationSteps < 0 ? defaultAnimationSteps : animationSteps);
}

void ScrollBase::setItemSelectedCallback(GenericCallback<int16_t>& callback)
{
    itemSelectedCallback = &callback;
}

void ScrollBase::setAnimationEndedCallback(GenericCallback<>& callback)
{
    animationEndedCallback = &callback;
}

void ScrollBase::setItemPressedCallback(GenericCallback<int16_t>& callback)
{
    itemPressedCallback = &callback;
}

bool ScrollBase::isAnimating() const
{
    return currentAnimationState != NO_ANIMATION;
}

void ScrollBase::stopAnimation()
{
    if (currentAnimationState == ANIMATING_GESTURE)
    {
        Application::getInstance()->unregisterTimerWidget(this);
        setOffset(gestureEnd);
    }
    currentAnimationState = NO_ANIMATION;
}

void ScrollBase::handleDragEvent(const DragEvent& evt)
{
    stopAnimation();
    currentAnimationState = ANIMATING_DRAG;
    int32_t newOffset = getOffset() + (getHorizontal() ? evt.getDeltaX() : evt.getDeltaY()) * dragAcceleration / 10;
    newOffset = keepOffsetInsideLimits(newOffset, itemSize * 3 / 4);
    setOffset(newOffset);
}

void ScrollBase::handleGestureEvent(const GestureEvent& evt)
{
    if (evt.getType() == (getHorizontal() ? GestureEvent::SWIPE_HORIZONTAL : GestureEvent::SWIPE_VERTICAL))
    {
        int16_t velocity = abs(evt.getVelocity());
        int16_t direction = evt.getVelocity() < 0 ? -1 : 1;
        int16_t steps = MAX(1, velocity - 4) * 7;
        int32_t newOffset = getOffset() + direction * steps * swipeAcceleration / 10;
        if (maxSwipeItems > 0)
        {
            newOffset = MIN(newOffset, initialSwipeOffset + maxSwipeItems * itemSize);
            newOffset = MAX(newOffset, initialSwipeOffset - maxSwipeItems * itemSize);
        }
        newOffset = keepOffsetInsideLimits(newOffset, 0);
        steps = MIN(steps, defaultAnimationSteps);
        animateToPosition(newOffset, steps);
    }
}

void ScrollBase::handleTickEvent()
{
    if (currentAnimationState == ANIMATING_GESTURE)
    {
        gestureStep++;
        int newPosition = gestureStart + easingEquation(gestureStep, 0, gestureEnd - gestureStart, gestureStepsTotal);
        setOffset(newPosition);
        if (gestureStep > gestureStepsTotal)
        {
            currentAnimationState = NO_ANIMATION;
            gestureStep = 0;
            Application::getInstance()->unregisterTimerWidget(this);
            setOffset(getNormalizedOffset(getOffset()));

            //Item has settled, call back
            if (animationEndedCallback && animationEndedCallback->isValid())
            {
                animationEndedCallback->execute();
            }
        }
    }
}

void ScrollBase::itemChanged(int itemIndex)
{
    list.itemChanged(itemIndex);
}

void ScrollBase::setOffset(int32_t offset)
{
    list.setOffset(offset + distanceBeforeAlignedItem);
}

int32_t ScrollBase::getOffset() const
{
    return list.getOffset() - distanceBeforeAlignedItem;
}

int ScrollBase::getNormalizedOffset(int offset) const
{
    int16_t numItems = getNumberOfItems();
    if (numItems == 0 || itemSize == 0)
    {
        return offset;
    }
    int32_t listSize = numItems * itemSize;
    offset %= listSize;
    if (offset > 0)
    {
        offset -= listSize;
    }
    return offset;
}

int32_t ScrollBase::getNearestAlignedOffset(int32_t offset) const
{
    if (itemSize == 0)
    {
        return offset;
    }
    if (getCircular())
    {
        if (offset < 0)
        {
            return (((offset - (itemSize / 2)) / itemSize) * itemSize);
        }
        return ((offset + (itemSize / 2)) / itemSize) * itemSize;
    }
    offset = keepOffsetInsideLimits(offset, 0);
    return ((offset - (itemSize / 2)) / itemSize) * itemSize;
}

void ScrollBase::animateToPosition(int32_t position, int16_t steps)
{
    position = getNearestAlignedOffset(position);
    if (steps < 0)
    {
        steps = defaultAnimationSteps;
    }
    if (steps < 1)
    {
        setOffset(position);
    }
    else
    {
        gestureStart = getOffset();
        gestureEnd = position;
        gestureStep = 0;
        gestureStepsTotal = steps;
        if (currentAnimationState != ANIMATING_GESTURE)
        {
            Application::getInstance()->registerTimerWidget(this);
            currentAnimationState = ANIMATING_GESTURE;
        }
    }
}
} // namespace touchgfx
