/******************************************************************************
* Copyright (c) 2014,  Hobu Inc., hobu@hobu.co
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* modification, are permitted provided that the following
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*
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*       notice, this list of conditions and the following disclaimer.
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*       may be used to endorse or promote products derived from this
*       software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include <pdal/DbReader.hpp>
#include <pdal/PDALUtils.hpp>

namespace pdal
{

void DbReader::loadSchema(PointLayoutPtr layout,
    const std::string& schemaString)
{
    XMLSchema schema(schemaString);
    loadSchema(layout, schema);
}

void DbReader::loadSchema(PointLayoutPtr layout, const XMLSchema& schema)
{
    m_layout = layout;
    m_dims = schema.xmlDims();

    // Always register X, Y and Z.  We will apply any scaling set
    // before handing it off to PDAL.
    using namespace Dimension;
    layout->registerDims( {Id::X, Id::Y, Id::Z} );

    m_orientation = schema.orientation();
    m_packedPointSize = 0;
    for (auto di = m_dims.begin(); di != m_dims.end(); ++di)
    {
        di->m_dimType.m_id =
            layout->registerOrAssignDim(di->m_name, di->m_dimType.m_type);
        m_packedPointSize += Dimension::size(di->m_dimType.m_type);
    }
}


// If we start reading from a DB block with a different schema, reflect that
// in the dimensions and size.
void DbReader::updateSchema(const XMLSchema& schema)
{
    m_dims = schema.xmlDims();
    m_orientation = schema.orientation();
    m_packedPointSize = 0;
    for (auto di = m_dims.begin(); di != m_dims.end(); ++di)
    {
        di->m_dimType.m_id = m_layout->findDim(di->m_name);
        m_packedPointSize += Dimension::size(di->m_dimType.m_type);
    }
}


DimTypeList DbReader::dbDimTypes() const
{
    DimTypeList dimTypes;

    for (auto di = m_dims.begin(); di != m_dims.end(); ++di)
        dimTypes.push_back(di->m_dimType);
    return dimTypes;
}


size_t DbReader::dimOffset(Dimension::Id id) const
{
    size_t offset = 0;
    for (auto di = m_dims.begin(); di != m_dims.end(); ++di)
    {
        if (di->m_dimType.m_id == id)
            break;
        offset += Dimension::size(di->m_dimType.m_type);
    }
    return offset;
}


void DbReader::writeField(PointRef& point, const char *pos, const DimType &dim)
{
    using namespace Dimension;

    if (dim.m_id == Id::X || dim.m_id == Id::Y || dim.m_id == Id::Z)
    {
        Everything e;

        memcpy(&e, pos, Dimension::size(dim.m_type));
        double d = Utils::toDouble(e, dim.m_type);
        d = (d * dim.m_xform.m_scale.m_val) + dim.m_xform.m_offset.m_val;
        point.setField(dim.m_id, d);
    }
    else
        point.setField(dim.m_id, dim.m_type, pos);
}


/// Write a point's packed data into a buffer.
/// \param[in] point PointRef to write to.
/// \param[in] buf  Pointer to packed DB point data.
void DbReader::writePoint(PointRef& point, const char *buf)
{
    for (auto di = m_dims.begin(); di != m_dims.end(); ++di)
    {
        writeField(point, buf, di->m_dimType);
        buf += Dimension::size(di->m_dimType.m_type);
    }
}

} // namespace pdal
