#include "explorerchunksky.h"

#include <math.h>
#include "baseexplorerchunk.h"
#include "rendering/camera.h"

ExplorerChunkSky::ExplorerChunkSky(Renderer* renderer, double size, SkyboxOrientation orientation) : BaseExplorerChunk(renderer)
{
    _box_size = size;
    _orientation = orientation;
    _center = VECTOR_ZERO;

    setMaxTextureSize(256);
    maintain();
}

void ExplorerChunkSky::onCameraEvent(CameraDefinition* camera)
{
    _center = cameraGetLocation(camera);
}

void ExplorerChunkSky::onRenderEvent(QGLWidget*)
{
    double size = _box_size;
    Vector3 camera = _center;

    glBegin(GL_QUADS);
    switch (_orientation)
    {
    case SKYBOX_NORTH:
        glTexCoord2d(0.0, 0.0);
        glVertex3d(camera.x - size, camera.y + size, camera.z - size);
        glTexCoord2d(0.0, 1.0);
        glVertex3d(camera.x - size, camera.y - size, camera.z - size);
        glTexCoord2d(1.0, 1.0);
        glVertex3d(camera.x + size, camera.y - size, camera.z - size);
        glTexCoord2d(1.0, 0.0);
        glVertex3d(camera.x + size, camera.y + size, camera.z - size);
        break;
    case SKYBOX_SOUTH:
        glTexCoord2d(0.0, 0.0);
        glVertex3d(camera.x + size, camera.y + size, camera.z + size);
        glTexCoord2d(0.0, 1.0);
        glVertex3d(camera.x + size, camera.y - size, camera.z + size);
        glTexCoord2d(1.0, 1.0);
        glVertex3d(camera.x - size, camera.y - size, camera.z + size);
        glTexCoord2d(1.0, 0.0);
        glVertex3d(camera.x - size, camera.y + size, camera.z + size);
        break;
    case SKYBOX_EAST:
        glTexCoord2d(0.0, 0.0);
        glVertex3d(camera.x + size, camera.y + size, camera.z - size);
        glTexCoord2d(0.0, 1.0);
        glVertex3d(camera.x + size, camera.y - size, camera.z - size);
        glTexCoord2d(1.0, 1.0);
        glVertex3d(camera.x + size, camera.y - size, camera.z + size);
        glTexCoord2d(1.0, 0.0);
        glVertex3d(camera.x + size, camera.y + size, camera.z + size);
        break;
    case SKYBOX_WEST:
        glTexCoord2d(0.0, 0.0);
        glVertex3d(camera.x - size, camera.y + size, camera.z + size);
        glTexCoord2d(0.0, 1.0);
        glVertex3d(camera.x - size, camera.y - size, camera.z + size);
        glTexCoord2d(1.0, 1.0);
        glVertex3d(camera.x - size, camera.y - size, camera.z - size);
        glTexCoord2d(1.0, 0.0);
        glVertex3d(camera.x - size, camera.y + size, camera.z - size);
        break;
    case SKYBOX_TOP:
        glTexCoord2d(0.0, 0.0);
        glVertex3d(camera.x - size, camera.y + size, camera.z + size);
        glTexCoord2d(0.0, 1.0);
        glVertex3d(camera.x - size, camera.y + size, camera.z - size);
        glTexCoord2d(1.0, 1.0);
        glVertex3d(camera.x + size, camera.y + size, camera.z - size);
        glTexCoord2d(1.0, 0.0);
        glVertex3d(camera.x + size, camera.y + size, camera.z + size);
        break;
    case SKYBOX_BOTTOM:
        /*glTexCoord2d(0.0, 0.0);
        glVertex3d(camera.x - size, camera.y - size, camera.z - size);
        glTexCoord2d(0.0, 1.0);
        glVertex3d(camera.x - size, camera.y - size, camera.z + size);
        glTexCoord2d(1.0, 1.0);
        glVertex3d(camera.x + size, camera.y - size, camera.z + size);
        glTexCoord2d(1.0, 0.0);
        glVertex3d(camera.x + size, camera.y - size, camera.z - size);*/
        break;
    }
    glEnd();
}

double ExplorerChunkSky::getDisplayedSizeHint(CameraDefinition*)
{
    return 1000.0;
}

Color ExplorerChunkSky::getTextureColor(double x, double y)
{
    Vector3 location;

    x -= 0.5;
    y -= 0.5;

    switch (_orientation)
    {
    case SKYBOX_NORTH:
        location.x = x;
        location.y = -y;
        location.z = -0.5;
        break;
    case SKYBOX_SOUTH:
        location.x = -x;
        location.y = -y;
        location.z = 0.5;
        break;
    case SKYBOX_EAST:
        location.x = 0.5;
        location.y = -y;
        location.z = x;
        break;
    case SKYBOX_WEST:
        location.x = -0.5;
        location.y = -y;
        location.z = -x;
        break;
    case SKYBOX_TOP:
        location.x = x;
        location.y = 0.5;
        location.z = -y;
        break;
    case SKYBOX_BOTTOM:
        location.x = x;
        location.y = -0.5;
        location.z = y;
        break;
    }
    location = v3Normalize(location);
    if (location.y < 0.0)
    {
        location.y = 0.0;
    }
    return renderer()->atmosphere->getSkyColor(renderer(), location).final;
}