/*
 * Copyright (c) 2015 Tricoire Sebastien 3dsman@free.fr
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 *
 */

#include "OE_display.h"
#include "OE_utils.h"

#include "OE_controller.h"


#include <iostream>

#include <GL/gl.h>
#include <cstdlib>
#include <math.h>
#include <cstdio>
#include <cstring>
#include <algorithm>
 
        //float OE_display::cx, OE_display::cy = 0.0;
        vector_2d OE_display::viewPos;
 		float OE_display::zoom = 1.0;
        //int OE_display::mouseX, OE_display::mouseY, OE_display::mouseXInit, OE_display::mouseYInit = -1;
		bool OE_display::pan = false;
		int OE_display::width, OE_display::height = 0;

OE_display::OE_display()
{
}

OE_display::OE_display(OE_document* document,OE_controller* controller)
{
	this->document = document;
}

OE_display::~OE_display()
{
}

/** \brief draw the document on screen
 *
 * \return true if all is ok
 *
 */

bool OE_display::setDocument(OE_document * document)
{
	
	this->document = document;
	if(document)
	{
        std::list<OE_pointcurve*>::iterator curve = document->curves.begin();
		
		while (curve != document->curves.end())
		{
			(*curve)->refresh(zoom/2);
			curve++;
		}
	}
	return true;
}


bool OE_display::setController(OE_controller* controller)
{
	this->controller = controller;
	return true;
}

/** \brief move and zoom to see the entire document
 */

void OE_display::showAll()
{
	if (document)
	{
	
		float xMin,yMin,xMax,yMax;
        BoundingBox bound = document->getBound();
        viewPos.x = (bound.getMax().x + bound.getMin().x)/2;
        viewPos.y = (bound.getMax().y + bound.getMin().y)/2;
		
        zoom = maxf((bound.getMax().x - bound.getMin().x )/width/1.5,(bound.getMax().y - bound.getMin().y)/height/1.5);
	}

}

void OE_display::showSelection()
{
	if (document&&controller)
	{

		float xMin,yMin,xMax,yMax;
		BoundingBox bound = controller->getSelectionBoundingBox();
		viewPos.x = (bound.getMax().x + bound.getMin().x)/2;
		viewPos.y = (bound.getMax().y + bound.getMin().y)/2;

		zoom = maxf((bound.getMax().x - bound.getMin().x )/width/1.5,(bound.getMax().y - bound.getMin().y)/height/1.5);
	}

}

void OE_display::mouse_Pos(double x, double y)
{
    if (pan)
        viewPos = viewPos + (mouse-vector_2d(x,y))*zoom;

    mouse.x = x;
    mouse.y = y;

    absMouse = viewPos+(mouse-vector_2d(width,height)/2)*zoom*2;
}
void OE_display::mouse_Button(int button, int action, int mods)
{
	if (button == GLFW_MOUSE_BUTTON_MIDDLE)
    {
        if (action == GLFW_PRESS)
            pan = true;
        else
            pan = false;
    }
}

void OE_display::scroll(double xoffset, double yoffset)
{
    if(!pan){
        if (yoffset>0)
        zoom = zoom/1.1;
        else
        zoom = zoom*1.1;
    }	
}

void OE_display::resize(int width, int height)
{
	this->width = width;
	this->height = height;
}

void OE_display::key(int key, int scancode, int action, int mods){};


vector_2d OE_display::screenToDocument(vector_2d pos)
{
	return viewPos+(pos-vector_2d(width,height)/2)*zoom*2;
}