/*

Open Asset Import Library (assimp)

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  copyright notice, this list of conditions and the

  following disclaimer.

* Redistributions in binary form must reproduce the above

  copyright notice, this list of conditions and the

  following disclaimer in the documentation and/or other

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* Neither the name of the assimp team, nor the names of its

  contributors may be used to endorse or promote products

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  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

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*/

/** @file  DXFHelper.h

 *  @brief Internal utilities for the DXF loader.

 */

#ifndef INCLUDED_DXFHELPER_H

#define INCLUDED_DXFHELPER_H

#include <assimp/LineSplitter.h>

#include <assimp/TinyFormatter.h>

#include <assimp/StreamReader.h>

#include <assimp/fast_atof.h>

#include <vector>

#include <assimp/DefaultLogger.hpp>

namespace Assimp::DXF {

// read pairs of lines, parse group code and value and provide utilities

// to convert the data to the target data type.

// do NOT skip empty lines. In DXF files, they count as valid data.

class LineReader {

public:

    explicit LineReader(StreamReaderLE& reader) : splitter(reader,false,true), groupcode( 0 ), end() {

        // empty

    }

    // -----------------------------------------

    bool Is(int gc, const char* what) const {

        return groupcode == gc && !strcmp(what,value.c_str());

    }

    // -----------------------------------------

    bool Is(int gc) const {

        return groupcode == gc;

    }

    // -----------------------------------------

    int GroupCode() const {

        return groupcode;

    }

    // -----------------------------------------

    const std::string& Value() const {

        return value;

    }

    // -----------------------------------------

    bool End() const {

        return !((bool)*this);

    }

    // -----------------------------------------

    unsigned int ValueAsUnsignedInt() const {

        return strtoul10(value.c_str());

    }

    // -----------------------------------------

    int ValueAsSignedInt() const {

        return strtol10(value.c_str());

    }

    // -----------------------------------------

    ai_real ValueAsFloat() const {

        return fast_atof(value.c_str());

    }

    // -----------------------------------------

    /** pseudo-iterator increment to advance to the next (groupcode/value) pair */

    LineReader& operator++() {

        if (end) {

            if (end == 1) {

                ++end;

            }

            return *this;

        }

        try {

            groupcode = strtol10(splitter->c_str());

            splitter++;

            value = *splitter;

            splitter++;

            // automatically skip over {} meta blocks (these are for application use

            // and currently not relevant for Assimp).

            if (value.length() && value[0] == '{') {

                size_t cnt = 0;

                for(;splitter->length() && splitter->at(0) != '}'; splitter++, cnt++);

                splitter++;

                ASSIMP_LOG_VERBOSE_DEBUG("DXF: skipped over control group (",cnt," lines)");

            }

        } catch(std::logic_error&) {

            ai_assert(!splitter);

        }

        if (!splitter) {

            end = 1;

        }

        return *this;

    }

    // -----------------------------------------

    LineReader& operator++(int) {

        return ++(*this);

    }

    // -----------------------------------------

    operator bool() const {

        return end <= 1;

    }

private:

    LineSplitter splitter;

    int groupcode;

    std::string value;

    int end;

};

// represents a POLYLINE or a LWPOLYLINE. or even a 3DFACE The data is converted as needed.

struct PolyLine {

    PolyLine() : flags() {

        // empty

    }

    std::vector<aiVector3D> positions;

    std::vector<aiColor4D>  colors;

    std::vector<unsigned int> indices;

    std::vector<unsigned int> counts;

    unsigned int flags;

    std::string layer;

    std::string desc;

};

// reference to a BLOCK. Specifies its own coordinate system.

struct InsertBlock {

    InsertBlock() : pos(0.f, 0.f, 0.f), scale(1.f,1.f,1.f), angle(0.0f) {

        // empty

    }

    aiVector3D pos;

    aiVector3D scale;

    float angle;

    std::string name;

};

// keeps track of all geometry in a single BLOCK.

struct Block {

    std::vector< std::shared_ptr<PolyLine> > lines;

    std::vector<InsertBlock> insertions;

    std::string name;

    aiVector3D base;

};

struct FileData {

    // note: the LAST block always contains the stuff from ENTITIES.

    std::vector<Block> blocks;

};

} // namespace Assimp::DXF

#endif // INCLUDED_DXFHELPER_H