/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) Statoil ASA, Ceetron Solutions AS
// 
//  ResInsight is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
// 
//  ResInsight 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 General Public License at <http://www.gnu.org/licenses/gpl.html> 
//  for more details.
//
/////////////////////////////////////////////////////////////////////////////////


#include "cvfBase.h"

#include "RivTernarySaturationOverlayItem.h"


#include "cvfOpenGL.h"
#include "cvfViewport.h"
#include "cvfCamera.h"
#include "cvfTextDrawer.h"
#include "cvfFont.h"
#include "cvfMatrixState.h"

#include "cvfRenderState_FF.h"
#include "cvfRenderStateDepth.h"
#include "cvfRenderStatePolygonOffset.h"



//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
RivTernarySaturationOverlayItem::RivTernarySaturationOverlayItem(cvf::Font* font)
    :    m_textColor(cvf::Color3::BLACK),
    m_font(font),
    m_size(100, 120)
{
}


//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
RivTernarySaturationOverlayItem::~RivTernarySaturationOverlayItem()
{
    // Empty destructor to avoid errors with undefined types when cvf::ref's destructor gets called
}



//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
void RivTernarySaturationOverlayItem::setAxisLabelsColor(const cvf::Color3f& color)
{
    m_textColor = color;
}


//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
cvf::Vec2ui RivTernarySaturationOverlayItem::sizeHint()
{
    return m_size;
}


//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
void RivTernarySaturationOverlayItem::setSize(const cvf::Vec2ui& size)
{
    m_size = size;
}


//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
void RivTernarySaturationOverlayItem::render(cvf::OpenGLContext* oglContext, const cvf::Vec2i& position, const cvf::Vec2ui& size)
{
    render(oglContext, position, size, false);
}


//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
void RivTernarySaturationOverlayItem::renderSoftware(cvf::OpenGLContext* oglContext, const cvf::Vec2i& position, const cvf::Vec2ui& size)
{
    render(oglContext, position, size, true);
}


//--------------------------------------------------------------------------------------------------
/// Set up camera/viewport and render
//--------------------------------------------------------------------------------------------------
void RivTernarySaturationOverlayItem::render(cvf::OpenGLContext* oglContext, const cvf::Vec2i& position, const cvf::Vec2ui& size, bool software)
{
    if (size.x() <= 0 || size.y() <= 0)
    {
        return;
    }

    cvf::Camera camera;
    camera.setViewport(position.x(), position.y(), size.x(), size.y());
    camera.setProjectionAsPixelExact2D();
    camera.setViewMatrix(cvf::Mat4d::IDENTITY);
    camera.applyOpenGL();
    camera.viewport()->applyOpenGL(oglContext, cvf::Viewport::CLEAR_DEPTH);

    cvf::TextDrawer textDrawer(m_font.p());
    textDrawer.setTextColor(m_textColor);

    textDrawer.addText("SWAT", cvf::Vec2f(0.0, 10.0));
    textDrawer.addText(m_swatRange, cvf::Vec2f(0.0, 0.0));

    textDrawer.addText("SOIL", cvf::Vec2f(static_cast<float>(size.x() - 25), 10.0));
    
    float soilRangePos = static_cast<float>(size.x() - 40);
    if (m_soilRange.size() < 6)
    {
        soilRangePos += 15;
    }
    textDrawer.addText(m_soilRange, cvf::Vec2f(soilRangePos, 0.0));

    textDrawer.addText("SGAS", cvf::Vec2f(static_cast<float>( (size.x() / 2) - 17 ), static_cast<float>(size.y() - 10)));
    textDrawer.addText(m_sgasRange, cvf::Vec2f(static_cast<float>( (size.x() / 2) - 17 ), static_cast<float>(size.y() - 20)));

    textDrawer.renderSoftware(oglContext, camera);

    renderAxisImmediateMode(oglContext);

    CVF_CHECK_OGL(oglContext);
}



//--------------------------------------------------------------------------------------------------
/// Draw the axis using immediate mode OpenGL
//--------------------------------------------------------------------------------------------------
void RivTernarySaturationOverlayItem::renderAxisImmediateMode(cvf::OpenGLContext* oglContext)
{
#ifdef CVF_OPENGL_ES
    CVF_UNUSED(layout);
    CVF_FAIL_MSG("Not supported on OpenGL ES");
#else

    cvf::RenderStateDepth depth(false);
    depth.applyOpenGL(oglContext);

    cvf::RenderStateLighting_FF lighting(false);
    lighting.applyOpenGL(oglContext);

    cvf::Color3ub colA(cvf::Color3::BLUE);
    cvf::Color3ub colB(cvf::Color3::GREEN);
    cvf::Color3ub colC(cvf::Color3::RED);

    float lowerBoundY = 20;
    float upperBoundY = static_cast<float>(m_size.y() - 20);

    cvf::Vec3f a(0, lowerBoundY, 0);
    cvf::Vec3f b(static_cast<float>(m_size.x()), lowerBoundY, 0);
    cvf::Vec3f c(static_cast<float>(m_size.x() / 2), upperBoundY, 0);


    // Draw filled rectangle elements
    glBegin(GL_TRIANGLE_FAN);

    glColor3ubv(colA.ptr());
    glVertex3fv(a.ptr());
    
    glColor3ubv(colB.ptr());
    glVertex3fv(b.ptr());

    glColor3ubv(colC.ptr());
    glVertex3fv(c.ptr());
    glVertex3fv(c.ptr());
    glEnd();


    // Lines
    cvf::Color3ub linesColor(cvf::Color3::WHITE);
    glColor3ubv(linesColor.ptr());
    glBegin(GL_LINE_LOOP);
    glVertex3fv(a.ptr());
    glVertex3fv(b.ptr());
    glVertex3fv(c.ptr());
    glEnd();

    cvf::RenderStateDepth resetDepth;
    resetDepth.applyOpenGL(oglContext);

    // Reset render states
    cvf::RenderStateLighting_FF resetLighting;
    resetLighting.applyOpenGL(oglContext);

    CVF_CHECK_OGL(oglContext);
#endif // CVF_OPENGL_ES

}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
void RivTernarySaturationOverlayItem::setRangeText(const cvf::String& soilRange, const cvf::String& sgasRange, const cvf::String& swatRange)
{
    m_soilRange = soilRange;
    m_sgasRange = sgasRange;
    m_swatRange = swatRange;
}