#include "Base.h"
#include "Light.h"
#include "Node.h"

namespace gameplay
{

Light::Light(Light::Type type, const Vector3& color) :
    _type(type), _node(NULL)
{
    _directional = new Directional(color);
}

Light::Light(Light::Type type, const Vector3& color, float range) :
    _type(type), _node(NULL)
{
    _point = new Point(color, range);
}

Light::Light(Light::Type type, const Vector3& color, float range, float innerAngle, float outerAngle) :
    _type(type), _node(NULL)
{
    _spot = new Spot(color, range, innerAngle, outerAngle);
}

Light::~Light()
{
    switch (_type)
    {
    case DIRECTIONAL:
        SAFE_DELETE(_directional);
        break;
    case POINT:
        SAFE_DELETE(_point);
        break;
    case SPOT:
        SAFE_DELETE(_spot);
        break;
    default:
        GP_ERROR("Invalid light type (%d).", _type);
        break;
    }
}

Light* Light::createDirectional(const Vector3& color)
{
    return new Light(DIRECTIONAL, color);
}

Light* Light::createDirectional(float red, float green, float blue)
{
    return new Light(DIRECTIONAL, Vector3(red, green, blue));
}

Light* Light::createPoint(const Vector3& color, float range)
{
    return new Light(POINT, color, range);
}

Light* Light::createPoint(float red, float green, float blue, float range)
{
    return new Light(POINT, Vector3(red, green, blue), range);
}

Light* Light::createSpot(const Vector3& color, float range, float innerAngle, float outerAngle)
{
    return new Light(SPOT, color, range, innerAngle, outerAngle);
}

Light* Light::createSpot(float red, float green, float blue, float range, float innerAngle, float outerAngle)
{
    return new Light(SPOT, Vector3(red, green, blue), range, innerAngle, outerAngle);
}

Light* Light::create(Properties* properties)
{
    GP_ASSERT(properties);

    // Read light type
    std::string typeStr;
    if (properties->exists("type"))
        typeStr = properties->getString("type");
    Light::Type type;
    if (typeStr == "DIRECTIONAL")
    {
        type = Light::DIRECTIONAL;
    }
    else if (typeStr == "POINT")
    {
        type = Light::POINT;
    }
    else if (typeStr == "SPOT")
    {
        type = Light::SPOT;
    }
    else
    {
        GP_ERROR("Invalid 'type' parameter for light definition.");
        return NULL;
    }

    // Read common parameters
    Vector3 color;
    if (!properties->getVector3("color", &color))
    {
        GP_ERROR("Missing valid 'color' parameter for light definition.");
        return NULL;
    }

    // Read light-specific parameters
    Light* light = NULL;
    switch (type)
    {
    case DIRECTIONAL:
        light = createDirectional(color);
        break;
    case POINT:
        {
            float range = properties->getFloat("range");
            if (range == 0.0f)
            {
                GP_ERROR("Missing valid 'range' parameter for point light definition.");
                return NULL;
            }
            light = createPoint(color, range);
        }
        break;
    case SPOT:
            float range = properties->getFloat("range");
            if (range == 0.0f)
            {
                GP_ERROR("Missing valid 'range' parameter for spot light definition.");
                return NULL;
            }
            float innerAngle = properties->getFloat("innerAngle");
            if (innerAngle == 0.0f)
            {
                GP_ERROR("Missing valid 'innerAngle' parameter for spot light definition.");
                return NULL;
            }
            float outerAngle = properties->getFloat("outerAngle");
            if (outerAngle == 0.0f)
            {
                GP_ERROR("Missing valid 'outerAngle' parameter for spot light definition.");
                return NULL;
            }
            light = createSpot(color, range, innerAngle, outerAngle);
        break;
    }

    return light;
}

Light::Type Light::getLightType() const
{
    return _type;
}

Node* Light::getNode() const
{
    return _node;
}

void Light::setNode(Node* node)
{
    // Connect the new node.
    _node = node;
}

const Vector3& Light::getColor() const
{
    switch (_type)
    {
    case DIRECTIONAL:
        GP_ASSERT(_directional);
        return _directional->color;
    case POINT:
        GP_ASSERT(_point);
        return _point->color;
    case SPOT:
        GP_ASSERT(_spot);
        return _spot->color;
    default:
        GP_ERROR("Unsupported light type (%d).", _type);
        return Vector3::zero();

    }
}

void Light::setColor(const Vector3& color)
{
    switch (_type)
    {
    case DIRECTIONAL:
        GP_ASSERT(_directional);
        _directional->color = color;
        break;
    case POINT:
        GP_ASSERT(_point);
        _point->color = color;
        break;
    case SPOT:
        GP_ASSERT(_spot);
        _spot->color = color;
        break;
    default:
        GP_ERROR("Unsupported light type (%d).", _type);
        break;
    }
}

void Light::setColor(float red, float green, float blue)
{
    setColor(Vector3(red, green, blue));
}

float Light::getRange()  const
{
    GP_ASSERT(_type != DIRECTIONAL);

    switch (_type)
    {
    case POINT:
        GP_ASSERT(_point);
        return _point->range;
    case SPOT:
        GP_ASSERT(_spot);
        return _spot->range;
    default:
        GP_ERROR("Unsupported light type (%d).", _type);
        return 0.0f;
    }
}
    
void Light::setRange(float range)
{
    GP_ASSERT(_type != DIRECTIONAL);

    switch (_type)
    {
    case POINT:
        GP_ASSERT(_point);
        _point->range = range;
        _point->rangeInverse = 1.0f / range;
        break;
    case SPOT:
        GP_ASSERT(_spot);
        _spot->range = range;
        _spot->rangeInverse = 1.0f / range;
        break;
    default:
        GP_ERROR("Unsupported light type (%d).", _type);
        break;
    }
}

float Light::getRangeInverse() const
{
    GP_ASSERT(_type != DIRECTIONAL);

    switch (_type)
    {
    case POINT:
        GP_ASSERT(_point);
        return _point->rangeInverse;
    case SPOT:
        GP_ASSERT(_spot);
        return _spot->rangeInverse;
    default:
        GP_ERROR("Unsupported light type (%d).", _type);
        return 0.0f;
    }
}
    
float Light::getInnerAngle()  const
{
    GP_ASSERT(_type == SPOT);

    return _spot->innerAngle;
}

void Light::setInnerAngle(float innerAngle)
{
    GP_ASSERT(_type == SPOT);

    _spot->innerAngle = innerAngle;
    _spot->innerAngleCos = cos(innerAngle);
}
    
float Light::getOuterAngle()  const
{
    GP_ASSERT(_type == SPOT);

    return _spot->outerAngle;
}

void Light::setOuterAngle(float outerAngle)
{
    GP_ASSERT(_type == SPOT);

    _spot->outerAngle = outerAngle;
    _spot->outerAngleCos = cos(outerAngle);
}
    
float Light::getInnerAngleCos()  const
{
    GP_ASSERT(_type == SPOT);

    return _spot->innerAngleCos;
}
    
float Light::getOuterAngleCos()  const
{
    GP_ASSERT(_type == SPOT);

    return _spot->outerAngleCos;
}

Light* Light::clone(NodeCloneContext &context) const
{
    Light* lightClone = NULL;
    switch (_type)
    {
    case DIRECTIONAL:
        lightClone = createDirectional(getColor());
        break;
    case POINT:
        lightClone = createPoint(getColor(), getRange());
        break;
    case SPOT:
        lightClone = createSpot(getColor(), getRange(), getInnerAngle(), getOuterAngle());
        break;
    default:
        GP_ERROR("Unsupported light type (%d).", _type);
        return NULL;
    }
    GP_ASSERT(lightClone);

    if (Node* node = context.findClonedNode(getNode()))
    {
        lightClone->setNode(node);
    }
    return lightClone;
}

Light::Directional::Directional(const Vector3& color)
    : color(color)
{
}

Light::Point::Point(const Vector3& color, float range)
    : color(color), range(range)
{
    rangeInverse = 1.0f / range;
}

Light::Spot::Spot(const Vector3& color, float range, float innerAngle, float outerAngle)
    : color(color), range(range), innerAngle(innerAngle), outerAngle(outerAngle)
{
    rangeInverse = 1.0f / range;
    innerAngleCos = cos(innerAngle);
    outerAngleCos = cos(outerAngle);
}

}