/******************************************************************************
 * Copyright (c) 2020, Hobu Inc.
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 *       notice, this list of conditions and the following disclaimer.
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 *       notice, this list of conditions and the following disclaimer in
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 *       with the distribution.
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 *       names of its contributors may be used to endorse or promote
 *       products derived from this software without specific prior
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#include "FaceRasterFilter.hpp"

#include <pdal/util/Utils.hpp>
#include <pdal/private/MathUtils.hpp>
#include <pdal/private/Raster.hpp>

namespace pdal
{

static StaticPluginInfo const s_info
{
    "filters.faceraster",
    "Face Raster Filter",
    "http://pdal.io/stages/filters.faceraster.html"
};

CREATE_STATIC_STAGE(FaceRasterFilter, s_info)

std::string FaceRasterFilter::getName() const
{
    return s_info.name;
}


FaceRasterFilter::FaceRasterFilter() : m_limits(new RasterLimits)
{}

FaceRasterFilter::~FaceRasterFilter()
{}

void FaceRasterFilter::addArgs(ProgramArgs& args)
{
    m_limits->addArgs(args);
    args.add("mesh", "Mesh name", m_meshName);
    args.add("nodata", "No data value", m_noData, std::numeric_limits<double>::quiet_NaN());
    args.add("max_triangle_edge_length", "Max triangle edge length",
             m_maxTriangleEdgeLength,std::numeric_limits<double>::infinity());
}

void FaceRasterFilter::prepared(PointTableRef)
{
    int cnt = m_limits->checkArgs();
    if (cnt != 0 && cnt != 4)
        throwError("Must specify all or none of 'origin_x', 'origin_y', 'width' and 'height'.");
    m_computeLimits = (cnt == 0);
}


void FaceRasterFilter::filter(PointView& v)
{
    double halfEdge = m_limits->edgeLength / 2;
    double edgeBit = m_limits->edgeLength * .000001;

    // If the user hasn't set bounds, set them based on the data.
    if (m_computeLimits)
    {
        BOX2D bounds;
        v.calculateBounds(bounds);
        m_limits->xOrigin = bounds.minx - halfEdge;
        m_limits->yOrigin = bounds.miny - halfEdge;
        m_limits->width = (int)(((bounds.maxx - m_limits->xOrigin) / m_limits->edgeLength) + 1);
        m_limits->height = (int)(((bounds.maxy - m_limits->yOrigin) / m_limits->edgeLength) + 1);
    }
    Rasterd *raster = v.createRaster("faceraster", *m_limits, m_noData);
    if (!raster)
        throwError("Raster already exists");

    TriangularMesh *m = v.mesh(m_meshName);
    if (!m)
        throwError("Mesh '" + m_meshName + "' does not exist.");

    for (const Triangle& t : *m)
    {
        double x1 = v.getFieldAs<double>(Dimension::Id::X, t.m_a);
        double y1 = v.getFieldAs<double>(Dimension::Id::Y, t.m_a);
        double z1 = v.getFieldAs<double>(Dimension::Id::Z, t.m_a);

        double x2 = v.getFieldAs<double>(Dimension::Id::X, t.m_b);
        double y2 = v.getFieldAs<double>(Dimension::Id::Y, t.m_b);
        double z2 = v.getFieldAs<double>(Dimension::Id::Z, t.m_b);

        if (!std::isinf(m_maxTriangleEdgeLength) &&
            std::hypot(x2 - x1, y2 - y1) > m_maxTriangleEdgeLength)
            continue;

        double x3 = v.getFieldAs<double>(Dimension::Id::X, t.m_c);
        double y3 = v.getFieldAs<double>(Dimension::Id::Y, t.m_c);
        double z3 = v.getFieldAs<double>(Dimension::Id::Z, t.m_c);

        if (!std::isinf(m_maxTriangleEdgeLength) &&
            (std::hypot(x2 - x3, y2 - y3) > m_maxTriangleEdgeLength ||
             std::hypot(x1 - x3, y1 - y3) > m_maxTriangleEdgeLength))
            continue;

        double xmax = (std::max)((std::max)(x1, x2), x3);
        double xmin = (std::min)((std::min)(x1, x2), x3);
        double ymax = (std::max)((std::max)(y1, y2), y3);
        double ymin = (std::min)((std::min)(y1, y2), y3);

        // Since we're checking cell centers, we add 1/2 the edge length to avoid testing cells
        // where we know the limiting position can't intersect the cell center.  The
        // subtraction of edgeBit for the lower bound is to allow for the case where the
        // minimum position is exactly aligned with a cell center (we could simply start one cell
        // lower and to the left, but this small adjustment eliminates that extra row/col in most
        // cases).
        bool okX, okY;
        int ax = raster->xCell(xmin + halfEdge - edgeBit, okX);
        int ay = raster->yCell(ymin + halfEdge - edgeBit, okY);
        if (!okX)
            throwError("X value out of range for raster.");
        if (!okY)
            throwError("Y value out of range for raster.");

        // edgeBit adjustment not necessary here since we're rounding up for exact values.
        int bx = raster->xCell(xmax + halfEdge, okX);
        int by = raster->yCell(ymax + halfEdge, okY);
        if (!okX)
            throwError("X value out of range for raster.");
        if (!okY)
            throwError("Y value out of range for raster.");

        ax = Utils::clamp(ax, 0, (int)m_limits->width);
        bx = Utils::clamp(bx, 0, (int)m_limits->width);
        ay = Utils::clamp(ay, 0, (int)m_limits->height);
        by = Utils::clamp(by, 0, (int)m_limits->height);

        for (int xi = ax; xi < bx; ++xi)
            for (int yi = ay; yi < by; ++yi)
            {
                double v = raster->at(xi, yi);
                if (std::isnan(m_noData))
                {
                    if (!std::isnan(v))
                        continue;
                }
                else if (v != m_noData)
                    continue;

                double x = raster->xCellPos(xi);
                double y = raster->yCellPos(yi);

                double val = math::barycentricInterpolation(x1, y1, z1,
                    x2, y2, z2, x3, y3, z3, x, y);
                if (val != std::numeric_limits<double>::infinity())
                    raster->at(xi, yi) = val;
            }
    }
}

} // namespace pdal
