/*
 * © Copyright 2014 – Urheberrechtshinweis
 * Alle Rechte vorbehalten / All Rights Reserved
 *
 * Programmcode ist urheberrechtlich geschuetzt.
 * Das Urheberrecht liegt, soweit nicht ausdruecklich anders gekennzeichnet, bei Frank Ebner.
 * Keine Verwendung ohne explizite Genehmigung.
 * (vgl. § 106 ff UrhG / § 97 UrhG)
 */

#include "../../../fixC11.h"

#include "GridRenderer.h"

#include <QOpenGLWidget>
#include <QOpenGLFunctions>

#include "GridModel.h"
#include <Indoor/grid/Grid.h>

/** render the given grid using GL commands */
void GridRenderer::render(const RenderSettings& rs, GridModel* model) {

	if (model == nullptr) {return;}

	rebuildIfNeeded(model);

	rs.shader->bind();
	rs.shader->setModelMatrix(QMatrix4x4());

	if (!edges.empty()) {
		rs.shader->setVertices(edges.getVertices().data());
		rs.shader->setVertexColor(edges.getRGBA().data());
		rs.funcs->glDrawArrays(GL_LINES, 0, edges.getVertices().size()/3);
		rs.shader->unsetVertices();
		rs.shader->unsetVertexColor();
	}

	if (!nodes.empty()) {
		rs.shader->setVertices(nodes.getVertices().data());
		rs.shader->setVertexColor(nodes.getRGBA().data());
		rs.funcs->glDrawArrays(GL_POINTS, 0, nodes.getVertices().size()/3);
		rs.shader->unsetVertices();
		rs.shader->unsetVertexColor();
	}

	rs.shader->release();

}

void GridRenderer::rebuildIfNeeded(GridModel* model) {

	// rebuild needed?
	if (lastBuildID == model->getBuildID()) {return;}
	lastBuildID = model->getBuildID();

	// reset previous nodes/edges
	edges.clear();
	nodes.clear();

	// get the grid
	auto grid = model->getGrid();

	const float sz = 1.0f;	// scale-z: more/less z-spacing
	const float oz = 0.1f;	// z-offset

	// build edges
	if (showEdges) {

		std::unordered_set<uint64_t> used;

		for (MyNode& n1 : *grid) {
			//glColor3f(0.5, 0.5, 0.5);
			for (MyNode& n2 : grid->neighbors(n1)) {
				uint64_t min = std::min(n1.getIdx(), n2.getIdx());
				uint64_t max = std::max(n1.getIdx(), n2.getIdx());
				uint64_t idx = max << 32 | min;
				if (used.find(idx) == used.end()) {
					Point3 p1(n1.x_cm/100.0f, n1.y_cm/100.0f, n1.z_cm/100.0f*sz+oz);
					Point3 p2(n2.x_cm/100.0f, n2.y_cm/100.0f, n2.z_cm/100.0f*sz+oz);
					edges.addLine(p1, p2, 0,0,0, 0.5);
					used.insert(idx);
				}
			}
		}

	}

	// build nodes
	if (showNodes) {

		TriangleData points;

		for (MyNode& n : *grid) {

			Color c;

			// get the color to use
			switch(colorMode) {

				case GridRendererColorMode::SHOW_NODE_TYPE: {
					c = colors[n.getType()];
					break;
				}

				case GridRendererColorMode::SHOW_NODE_IMPORTANCE: {
					const float xx = n.navImportance - 0.6;
					c = Color(xx, xx, xx);
					break;
				}

			}

			const Point3 p(n.x_cm/100.0f, n.y_cm/100.0f, n.z_cm/100.0f*sz+oz);
			points.addPoint(p, c.r, c.g, c.b, 1);

		}

	}

}