#include "CCEGLViewProtocol.h"
#include "CCTouch.h"
#include "CCDirector.h"
#include "CCSet.h"
#include "CCEventDispatcher.h"


NS_CC_BEGIN

namespace {
    
    static Touch* g_touches[EventTouch::MAX_TOUCHES] = { nullptr };
    static unsigned int g_indexBitsUsed = 0;
    // System touch pointer ID (It may not be ascending order number) <-> Ascending order number from 0
    static std::map<int, int> g_touchIdReorderMap;
    
    static int getUnUsedIndex()
    {
        int i;
        int temp = g_indexBitsUsed;
        
        for (i = 0; i < EventTouch::MAX_TOUCHES; i++) {
            if (! (temp & 0x00000001)) {
                g_indexBitsUsed |= (1 <<  i);
                return i;
            }
            
            temp >>= 1;
        }
        
        // all bits are used
        return -1;
    }
    
    static void removeUsedIndexBit(int index)
    {
        if (index < 0 || index >= EventTouch::MAX_TOUCHES)
        {
            return;
        }
        
        unsigned int temp = 1 << index;
        temp = ~temp;
        g_indexBitsUsed &= temp;
    }
    
}

EGLViewProtocol::EGLViewProtocol()
: _delegate(nullptr)
, _scaleX(1.0f)
, _scaleY(1.0f)
, _resolutionPolicy(ResolutionPolicy::UNKNOWN)
{
}

EGLViewProtocol::~EGLViewProtocol()
{

}

void EGLViewProtocol::pollInputEvents()
{
}

void EGLViewProtocol::setDesignResolutionSize(float width, float height, ResolutionPolicy resolutionPolicy)
{
    CCASSERT(resolutionPolicy != ResolutionPolicy::UNKNOWN, "should set resolutionPolicy");
    
    if (width == 0.0f || height == 0.0f)
    {
        return;
    }

    _designResolutionSize.setSize(width, height);
    
    _scaleX = (float)_screenSize.width / _designResolutionSize.width;
    _scaleY = (float)_screenSize.height / _designResolutionSize.height;
    
    if (resolutionPolicy == ResolutionPolicy::NO_BORDER)
    {
        _scaleX = _scaleY = MAX(_scaleX, _scaleY);
    }
    
    if (resolutionPolicy == ResolutionPolicy::SHOW_ALL)
    {
        _scaleX = _scaleY = MIN(_scaleX, _scaleY);
    }

    if ( resolutionPolicy == ResolutionPolicy::FIXED_HEIGHT) {
    	_scaleX = _scaleY;
    	_designResolutionSize.width = ceilf(_screenSize.width/_scaleX);
    }

    if ( resolutionPolicy == ResolutionPolicy::FIXED_WIDTH) {
    	_scaleY = _scaleX;
    	_designResolutionSize.height = ceilf(_screenSize.height/_scaleY);
    }

    // calculate the rect of viewport    
    float viewPortW = _designResolutionSize.width * _scaleX;
    float viewPortH = _designResolutionSize.height * _scaleY;

    _viewPortRect.setRect((_screenSize.width - viewPortW) / 2, (_screenSize.height - viewPortH) / 2, viewPortW, viewPortH);
    
    _resolutionPolicy = resolutionPolicy;
    
	// reset director's member variables to fit visible rect
    Director::getInstance()->_winSizeInPoints = getDesignResolutionSize();
    Director::getInstance()->createStatsLabel();
    Director::getInstance()->setGLDefaultValues();
}

const Size& EGLViewProtocol::getDesignResolutionSize() const 
{
    return _designResolutionSize;
}

const Size& EGLViewProtocol::getFrameSize() const
{
    return _screenSize;
}

void EGLViewProtocol::setFrameSize(float width, float height)
{
    _designResolutionSize = _screenSize = Size(width, height);
}

Size  EGLViewProtocol::getVisibleSize() const
{
    if (_resolutionPolicy == ResolutionPolicy::NO_BORDER)
    {
        return Size(_screenSize.width/_scaleX, _screenSize.height/_scaleY);
    }
    else 
    {
        return _designResolutionSize;
    }
}

Point EGLViewProtocol::getVisibleOrigin() const
{
    if (_resolutionPolicy == ResolutionPolicy::NO_BORDER)
    {
        return Point((_designResolutionSize.width - _screenSize.width/_scaleX)/2, 
                           (_designResolutionSize.height - _screenSize.height/_scaleY)/2);
    }
    else 
    {
        return Point::ZERO;
    }
}

void EGLViewProtocol::setTouchDelegate(EGLTouchDelegate * delegate)
{
    _delegate = delegate;
}

void EGLViewProtocol::setViewPortInPoints(float x , float y , float w , float h)
{
    glViewport((GLint)(x * _scaleX + _viewPortRect.origin.x),
               (GLint)(y * _scaleY + _viewPortRect.origin.y),
               (GLsizei)(w * _scaleX),
               (GLsizei)(h * _scaleY));
}

void EGLViewProtocol::setScissorInPoints(float x , float y , float w , float h)
{
    glScissor((GLint)(x * _scaleX + _viewPortRect.origin.x),
              (GLint)(y * _scaleY + _viewPortRect.origin.y),
              (GLsizei)(w * _scaleX),
              (GLsizei)(h * _scaleY));
}

bool EGLViewProtocol::isScissorEnabled()
{
	return (GL_FALSE == glIsEnabled(GL_SCISSOR_TEST)) ? false : true;
}

Rect EGLViewProtocol::getScissorRect() const
{
	GLfloat params[4];
	glGetFloatv(GL_SCISSOR_BOX, params);
	float x = (params[0] - _viewPortRect.origin.x) / _scaleX;
	float y = (params[1] - _viewPortRect.origin.y) / _scaleY;
	float w = params[2] / _scaleX;
	float h = params[3] / _scaleY;
	return Rect(x, y, w, h);
}

void EGLViewProtocol::setViewName(const std::string& viewname )
{
    _viewName = viewname;
}

const std::string& EGLViewProtocol::getViewName() const
{
    return _viewName;
}

void EGLViewProtocol::handleTouchesBegin(int num, int ids[], float xs[], float ys[])
{
    int id = 0;
    float x = 0.0f;
    float y = 0.0f;
    int unusedIndex = 0;
    EventTouch touchEvent;
    
    for (int i = 0; i < num; ++i)
    {
        id = ids[i];
        x = xs[i];
        y = ys[i];

        auto iter = g_touchIdReorderMap.find(id);
        unusedIndex = 0;

        // it is a new touch
        if (iter == g_touchIdReorderMap.end())
        {
            unusedIndex = getUnUsedIndex();

            // The touches is more than MAX_TOUCHES ?
            if (unusedIndex == -1) {
                CCLOG("The touches is more than MAX_TOUCHES, unusedIndex = %d", unusedIndex);
                continue;
            }

            Touch* touch = g_touches[unusedIndex] = new Touch();
			touch->setTouchInfo(unusedIndex, (x - _viewPortRect.origin.x) / _scaleX,
                                     (y - _viewPortRect.origin.y) / _scaleY);
            
            CCLOGINFO("x = %f y = %f", pTouch->getLocationInView().x, pTouch->getLocationInView().y);
            
            g_touchIdReorderMap.insert(std::make_pair(id, unusedIndex));
            touchEvent._touches.push_back(touch);
        }
    }

    if (touchEvent._touches.size() == 0)
    {
        CCLOG("touchesBegan: size = 0");
        return;
    }
    
    touchEvent._eventCode = EventTouch::EventCode::BEGAN;
    auto dispatcher = Director::getInstance()->getEventDispatcher();
    dispatcher->dispatchEvent(&touchEvent);
}

void EGLViewProtocol::handleTouchesMove(int num, int ids[], float xs[], float ys[])
{
    int id = 0;
    float x = 0.0f;
    float y = 0.0f;
    EventTouch touchEvent;
    
    for (int i = 0; i < num; ++i)
    {
        id = ids[i];
        x = xs[i];
        y = ys[i];

        auto iter = g_touchIdReorderMap.find(id);
        if (iter == g_touchIdReorderMap.end())
        {
            CCLOG("if the index doesn't exist, it is an error");
            continue;
        }

        CCLOGINFO("Moving touches with id: %d, x=%f, y=%f", id, x, y);
        Touch* touch = g_touches[iter->second];
        if (touch)
        {
			touch->setTouchInfo(iter->second, (x - _viewPortRect.origin.x) / _scaleX,
								(y - _viewPortRect.origin.y) / _scaleY);
            
            touchEvent._touches.push_back(touch);
        }
        else
        {
            // It is error, should return.
            CCLOG("Moving touches with id: %d error", id);
            return;
        }
    }

    if (touchEvent._touches.size() == 0)
    {
        CCLOG("touchesMoved: size = 0");
        return;
    }
    
    touchEvent._eventCode = EventTouch::EventCode::MOVED;
    auto dispatcher = Director::getInstance()->getEventDispatcher();
    dispatcher->dispatchEvent(&touchEvent);
}

void EGLViewProtocol::handleTouchesOfEndOrCancel(EventTouch::EventCode eventCode, int num, int ids[], float xs[], float ys[])
{
    int id = 0;
    float x = 0.0f;
    float y = 0.0f;
    EventTouch touchEvent;
    
    for (int i = 0; i < num; ++i)
    {
        id = ids[i];
        x = xs[i];
        y = ys[i];

        auto iter = g_touchIdReorderMap.find(id);
        if (iter == g_touchIdReorderMap.end())
        {
            CCLOG("if the index doesn't exist, it is an error");
            continue;
        }
        
        /* Add to the set to send to the director */
        Touch* touch = g_touches[iter->second];
        if (touch)
        {
            CCLOGINFO("Ending touches with id: %d, x=%f, y=%f", id, x, y);
			touch->setTouchInfo(iter->second, (x - _viewPortRect.origin.x) / _scaleX,
								(y - _viewPortRect.origin.y) / _scaleY);

            touchEvent._touches.push_back(touch);
            
            g_touches[iter->second] = nullptr;
            removeUsedIndexBit(iter->second);

            g_touchIdReorderMap.erase(id);
        } 
        else
        {
            CCLOG("Ending touches with id: %d error", id);
            return;
        } 

    }

    if (touchEvent._touches.size() == 0)
    {
        CCLOG("touchesEnded or touchesCancel: size = 0");
        return;
    }
    
    touchEvent._eventCode = eventCode;
    auto dispatcher = Director::getInstance()->getEventDispatcher();
    dispatcher->dispatchEvent(&touchEvent);
    
    for (auto& touch : touchEvent._touches)
    {
        // release the touch object.
        touch->release();
    }
}

void EGLViewProtocol::handleTouchesEnd(int num, int ids[], float xs[], float ys[])
{
    handleTouchesOfEndOrCancel(EventTouch::EventCode::ENDED, num, ids, xs, ys);
}

void EGLViewProtocol::handleTouchesCancel(int num, int ids[], float xs[], float ys[])
{
    handleTouchesOfEndOrCancel(EventTouch::EventCode::CANCELLED, num, ids, xs, ys);
}

const Rect& EGLViewProtocol::getViewPortRect() const
{
    return _viewPortRect;
}

float EGLViewProtocol::getScaleX() const
{
    return _scaleX;
}

float EGLViewProtocol::getScaleY() const
{
    return _scaleY;
}

NS_CC_END