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#pragma once

#include "export.hpp"
#include <pdal/PointView.hpp>

#define NPY_TARGET_VERSION NPY_1_22_API_VERSION
#define NPY_NO_DEPRECATED_API NPY_1_22_API_VERSION

#define NO_IMPORT_ARRAY
#define PY_ARRAY_UNIQUE_SYMBOL PDAL_ARRAY_API

#include <pdal/io/MemoryViewReader.hpp>

#include <numpy/ndarraytypes.h>
#include <numpy/arrayobject.h>

#include <vector>
#include <memory>

namespace pdal
{
namespace python
{


class ArrayIter;

using ArrayStreamHandler = std::function<int64_t()>;

class PDAL_EXPORT Array
{
public:
    using Shape = std::array<size_t, 3>;
    using Fields = std::vector<MemoryViewReader::Field>;

    Array(PyArrayObject* array, std::shared_ptr<ArrayStreamHandler> stream_handler = {});
    ~Array();

    Array(Array&& a) = default;
    Array& operator=(Array&& a) = default;

    Array(const Array&) = delete;
    Array() = delete;

    bool rowMajor() const { return m_rowMajor; };
    Shape shape() const { return m_shape; }
    const Fields& fields() const { return m_fields; };
    std::shared_ptr<ArrayIter> iterator();

private:
    PyArrayObject* m_array;
    Fields m_fields;
    bool m_rowMajor;
    Shape m_shape {};
    std::shared_ptr<ArrayStreamHandler> m_stream_handler;
};


class PDAL_EXPORT ArrayIter
{
public:
    ArrayIter(const ArrayIter&) = delete;
    ArrayIter() = delete;

    ArrayIter(PyArrayObject*, std::shared_ptr<ArrayStreamHandler>);
    ~ArrayIter();

    ArrayIter& operator++();
    operator bool () const { return !m_done; }
    char* operator*() const { return *m_data; }

private:
    NpyIter *m_iter = nullptr;
    NpyIter_IterNextFunc *m_iterNext;
    char **m_data;
    npy_intp m_size;
    npy_intp m_stride;
    bool m_done;

    std::shared_ptr<ArrayStreamHandler> m_stream_handler;
    void initIterator();
    void resetIterator();
};

} // namespace python
} // namespace pdal

