// Copyright 2013-2025 Daniel Parker

// Distributed under the Boost license, Version 1.0.

// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

// See https://github.com/danielaparker/jsoncons for latest version

#ifndef JSONCONS_EXT_BSON_DECODE_BSON_HPP

#define JSONCONS_EXT_BSON_DECODE_BSON_HPP

#include <istream> // std::basic_istream

#include <type_traits> // std::enable_if

#include <jsoncons/allocator_set.hpp>

#include <jsoncons/basic_json.hpp>

#include <jsoncons/config/compiler_support.hpp>

#include <jsoncons/conv_error.hpp>

#include <jsoncons/json_decoder.hpp>

#include <jsoncons/json_visitor.hpp>

#include <jsoncons/reflect/decode_traits.hpp>

#include <jsoncons/ser_util.hpp>

#include <jsoncons/source.hpp>

#include <jsoncons/utility/more_type_traits.hpp>

#include <jsoncons_ext/bson/bson_cursor.hpp>

#include <jsoncons_ext/bson/bson_options.hpp>

#include <jsoncons_ext/bson/bson_reader.hpp>

namespace jsoncons { 

namespace bson {

template <typename T,typename BytesLike>

typename std::enable_if<ext_traits::is_basic_json<T>::value &&

                        ext_traits::is_byte_sequence<BytesLike>::value,read_result<T>>::type 

try_decode_bson(const BytesLike& v, 

    const bson_decode_options& options = bson_decode_options())

{

    using value_type = T;

    using result_type = read_result<value_type>;

    std::error_code ec;   

    jsoncons::json_decoder<T> decoder;

    auto adaptor = make_json_visitor_adaptor<json_visitor>(decoder);

    basic_bson_reader<jsoncons::bytes_source> reader(v, adaptor, options);

    reader.read(ec);

    if (JSONCONS_UNLIKELY(ec))

    {

        return result_type{jsoncons::unexpect, ec, reader.line(), reader.column()};

    }

    if (JSONCONS_UNLIKELY(!decoder.is_valid()))

    {

        return result_type{jsoncons::unexpect, conv_errc::conversion_failed, reader.line(), reader.column()};

    }

    return result_type{decoder.get_result()};

}

template <typename T,typename BytesLike>

typename std::enable_if<!ext_traits::is_basic_json<T>::value &&

                        ext_traits::is_byte_sequence<BytesLike>::value,read_result<T>>::type 

try_decode_bson(const BytesLike& v, 

    const bson_decode_options& options = bson_decode_options())

{

    using value_type = T;

    using result_type = read_result<value_type>;

    std::error_code ec;

    basic_bson_cursor<bytes_source> cursor(v, options, ec);

    if (JSONCONS_UNLIKELY(ec))

    {

        return result_type{jsoncons::unexpect, ec, cursor.line(), cursor.column()};

    }

    return reflect::decode_traits<T>::try_decode(make_alloc_set(), cursor);

}

template <typename T>

typename std::enable_if<ext_traits::is_basic_json<T>::value,read_result<T>>::type 

try_decode_bson(std::istream& is, 

    const bson_decode_options& options = bson_decode_options())

{

    using value_type = T;

    using result_type = read_result<value_type>;

    std::error_code ec;   

    jsoncons::json_decoder<T> decoder;

    auto adaptor = make_json_visitor_adaptor<json_visitor>(decoder);

    bson_stream_reader reader(is, adaptor, options);

    reader.read(ec);

    if (JSONCONS_UNLIKELY(ec))

    {

        return result_type{jsoncons::unexpect, ec, reader.line(), reader.column()};

    }

    if (JSONCONS_UNLIKELY(!decoder.is_valid()))

    {

        return result_type{jsoncons::unexpect, conv_errc::conversion_failed, reader.line(), reader.column()};

    }

    return result_type{decoder.get_result()};

}

template <typename T>

typename std::enable_if<!ext_traits::is_basic_json<T>::value,read_result<T>>::type 

try_decode_bson(std::istream& is, 

    const bson_decode_options& options = bson_decode_options())

{

    using value_type = T;

    using result_type = read_result<value_type>;

    std::error_code ec;

    basic_bson_cursor<binary_stream_source> cursor(is, options, ec);

    if (JSONCONS_UNLIKELY(ec))

    {

        return result_type{jsoncons::unexpect, ec, cursor.line(), cursor.column()};

    }

    return reflect::decode_traits<T>::try_decode(make_alloc_set(), cursor);

}

template <typename T,typename InputIt>

typename std::enable_if<ext_traits::is_basic_json<T>::value,read_result<T>>::type 

try_decode_bson(InputIt first, InputIt last,

    const bson_decode_options& options = bson_decode_options())

{

    using value_type = T;

    using result_type = read_result<value_type>;

    std::error_code ec;   

    jsoncons::json_decoder<T> decoder;

    auto adaptor = make_json_visitor_adaptor<json_visitor>(decoder);

    basic_bson_reader<binary_iterator_source<InputIt>> reader(binary_iterator_source<InputIt>(first, last), adaptor, options);

    reader.read(ec);

    if (JSONCONS_UNLIKELY(ec))

    {

        return result_type{jsoncons::unexpect, ec, reader.line(), reader.column()};

    }

    if (JSONCONS_UNLIKELY(!decoder.is_valid()))

    {

        return result_type{jsoncons::unexpect, conv_errc::conversion_failed, reader.line(), reader.column()};

    }

    return result_type{decoder.get_result()};

}

template <typename T,typename InputIt>

typename std::enable_if<!ext_traits::is_basic_json<T>::value,read_result<T>>::type 

try_decode_bson(InputIt first, InputIt last,

    const bson_decode_options& options = bson_decode_options())

{

    using value_type = T;

    using result_type = read_result<value_type>;

    std::error_code ec;

    basic_bson_cursor<binary_iterator_source<InputIt>> cursor(binary_iterator_source<InputIt>(first, last), options, ec);

    if (JSONCONS_UNLIKELY(ec))

    {

        return result_type{jsoncons::unexpect, ec, cursor.line(), cursor.column()};

    }

    return reflect::decode_traits<T>::try_decode(make_alloc_set(), cursor);

}

// With leading allocator_set parameter

template <typename T,typename BytesLike,typename Alloc,typename TempAlloc >

typename std::enable_if<ext_traits::is_basic_json<T>::value &&

                        ext_traits::is_byte_sequence<BytesLike>::value,read_result<T>>::type 

try_decode_bson(const allocator_set<Alloc,TempAlloc>& aset,

    const BytesLike& v, 

    const bson_decode_options& options = bson_decode_options())

{

    using value_type = T;

    using result_type = read_result<value_type>;

    std::error_code ec;   

    json_decoder<T,TempAlloc> decoder(aset.get_allocator(), aset.get_temp_allocator());

    auto adaptor = make_json_visitor_adaptor<json_visitor>(decoder);

    basic_bson_reader<jsoncons::bytes_source,TempAlloc> reader(v, adaptor, options, aset.get_temp_allocator());

    reader.read(ec);

    if (JSONCONS_UNLIKELY(ec))

    {

        return result_type{jsoncons::unexpect, ec, reader.line(), reader.column()};

    }

    if (JSONCONS_UNLIKELY(!decoder.is_valid()))

    {

        return result_type{jsoncons::unexpect, conv_errc::conversion_failed, reader.line(), reader.column()};

    }

    return result_type{decoder.get_result()};

}

template <typename T,typename BytesLike,typename Alloc,typename TempAlloc >

typename std::enable_if<!ext_traits::is_basic_json<T>::value &&

                        ext_traits::is_byte_sequence<BytesLike>::value,read_result<T>>::type 

try_decode_bson(const allocator_set<Alloc,TempAlloc>& aset,

    const BytesLike& v, 

    const bson_decode_options& options = bson_decode_options())

{

    using value_type = T;

    using result_type = read_result<value_type>;

    std::error_code ec;

    basic_bson_cursor<bytes_source,TempAlloc> cursor(std::allocator_arg, aset.get_temp_allocator(), v, options, ec);

    if (JSONCONS_UNLIKELY(ec))

    {

        return result_type{jsoncons::unexpect, ec, cursor.line(), cursor.column()};

    }

    return reflect::decode_traits<T>::try_decode(aset, cursor);

}

template <typename T,typename Alloc,typename TempAlloc >

typename std::enable_if<ext_traits::is_basic_json<T>::value,read_result<T>>::type 

try_decode_bson(const allocator_set<Alloc,TempAlloc>& aset,

    std::istream& is, 

    const bson_decode_options& options = bson_decode_options())

{

    using value_type = T;

    using result_type = read_result<value_type>;

    using byte_allocator_type = typename std::allocator_traits<TempAlloc>:: template rebind_alloc<uint8_t>;

    using stream_source_type = stream_source<uint8_t,byte_allocator_type>;

    std::error_code ec;   

    json_decoder<T,TempAlloc> decoder(aset.get_allocator(), aset.get_temp_allocator());

    auto adaptor = make_json_visitor_adaptor<json_visitor>(decoder);

    basic_bson_reader<stream_source_type,TempAlloc> reader(stream_source_type(is,aset.get_temp_allocator()), 

        adaptor, options, aset.get_temp_allocator());

    reader.read(ec);

    if (JSONCONS_UNLIKELY(ec))

    {

        return result_type{jsoncons::unexpect, ec, reader.line(), reader.column()};

    }

    if (JSONCONS_UNLIKELY(!decoder.is_valid()))

    {

        return result_type{jsoncons::unexpect, conv_errc::conversion_failed, reader.line(), reader.column()};

    }

    return result_type{decoder.get_result()};

}

template <typename T,typename Alloc,typename TempAlloc >

typename std::enable_if<!ext_traits::is_basic_json<T>::value,read_result<T>>::type 

try_decode_bson(const allocator_set<Alloc,TempAlloc>& aset,

    std::istream& is, 

    const bson_decode_options& options = bson_decode_options())

{

    using value_type = T;

    using result_type = read_result<value_type>;

    std::error_code ec;

    basic_bson_cursor<binary_stream_source,TempAlloc> cursor(std::allocator_arg, aset.get_temp_allocator(), is, options, ec);

    if (JSONCONS_UNLIKELY(ec))

    {

        return result_type{jsoncons::unexpect, ec, cursor.line(), cursor.column()};

    }

    return reflect::decode_traits<T>::try_decode(aset, cursor);

}

template <typename T, typename... Args>

T decode_bson(Args&& ... args)

{

    auto result = try_decode_bson<T>(std::forward<Args>(args)...); 

    if (!result)

    {

        JSONCONS_THROW(ser_error(result.error().code(), result.error().line(), result.error().column()));

    }

    return std::move(*result);

}

} // namespace bson

} // namespace jsoncons

#endif // JSONCONS_EXT_BSON_DECODE_BSON_HPP