// Copyright 2013-2026 Daniel Parker
// Distributed under Boost license

#include <jsoncons_ext/cbor/cbor.hpp>
#include <jsoncons_ext/jsonpointer/jsonpointer.hpp>
#include <jsoncons_ext/jsonpath/jsonpath.hpp>
#include <jsoncons_ext/csv/csv.hpp>

#include "common/sample_types.hpp"
#include <jsoncons/json.hpp>

#include <string>
#include <vector>
#include <iomanip>
#include <iostream>

using namespace jsoncons;    

void as_a_variant_like_structure()
{
    // Some JSON input data
    std::string data = R"(
        {
           "application": "hiking",
           "reputons": [
           {
               "rater": "HikingAsylum",
               "assertion": "advanced",
               "rated": "Marilyn C",
               "rating": 0.90,
               "generated": 1514862245
             }
           ]
        }
    )";

    // Parse the string of data into a json value
    json j = json::parse(data);

    // Does object member reputons exist?
    std::cout << "(1) " << std::boolalpha << j.contains("reputons") << "\n\n";

    // Get a reference to reputons array 
    const json& v = j["reputons"]; 

    // Iterate over reputons array 
    std::cout << "(2)\n";
    for (const auto& item : v.array_range())
    {
        // Access rated as string and rating as double
        std::cout << item["rated"].as<std::string>() << ", " << item["rating"].as<double>() << "\n";
    }
    std::cout << "\n";

    // Select all "rated" with JSONPath
    std::cout << "(3)\n";
    json result = jsonpath::json_query(j,"$..rated");
    std::cout << pretty_print(result) << "\n\n";

    // Serialize back to JSON
    std::cout << "(4)\n" << pretty_print(j) << "\n\n";
}

void as_a_strongly_typed_cpp_structure()
{
    // Some JSON input data
    std::string data = R"(
        {
           "application": "hiking",
           "reputons": [
           {
               "rater": "HikingAsylum",
               "assertion": "advanced",
               "rated": "Marilyn C",
               "rating": 0.90,
               "generated": 1514862245
             }
           ]
        }
    )";

    // Decode the string of data into a c++ structure
    ns::hiking_reputation v = decode_json<ns::hiking_reputation>(data);

    // Iterate over reputons array value
    std::cout << "(1)\n";
    for (const auto& item : v.reputons())
    {
        std::cout << item.rated() << ", " << item.rating();
        if (item.generated())
        {
            std::cout << ", " << (*item.generated()).count();
        }
        std::cout << "\n";
    }

    // Encode the c++ structure into a string
    std::string s;
    encode_json_pretty(v, s);
    std::cout << "(2)\n";
    std::cout << s << "\n";
}

void with_cursor_level_access()
{
    // Some JSON input data
    std::string data = R"(
        {
           "application": "hiking",
           "reputons": [
           {
               "rater": "HikingAsylum",
               "assertion": "advanced",
               "rated": "Marilyn C",
               "rating": 0.90,
               "generated": 1514862245
             }
           ]
        }
    )";

    json_string_cursor cursor(data);
    for (; !cursor.done(); cursor.next())
    {
        const auto& event = cursor.current();
        switch (event.event_type())
        {
            case staj_event_type::begin_array:
                std::cout << event.event_type() << " " << "\n";
                break;
            case staj_event_type::end_array:
                std::cout << event.event_type() << " " << "\n";
                break;
            case staj_event_type::begin_object:
                std::cout << event.event_type() << " " << "\n";
                break;
            case staj_event_type::end_object:
                std::cout << event.event_type() << " " << "\n";
                break;
            case staj_event_type::key:
                // Or std::string_view, if supported
                std::cout << event.event_type() << ": " << event.get<jsoncons::string_view>() << "\n";
                break;
            case staj_event_type::string_value:
                // Or std::string_view, if supported
                std::cout << event.event_type() << ": " << event.get<jsoncons::string_view>() << "\n";
                break;
            case staj_event_type::null_value:
                std::cout << event.event_type() << "\n";
                break;
            case staj_event_type::bool_value:
                std::cout << event.event_type() << ": " << std::boolalpha << event.get<bool>() << "\n";
                break;
            case staj_event_type::int64_value:
                std::cout << event.event_type() << ": " << event.get<int64_t>() << "\n";
                break;
            case staj_event_type::uint64_value:
                std::cout << event.event_type() << ": " << event.get<uint64_t>() << "\n";
                break;
            case staj_event_type::double_value:
                std::cout << event.event_type() << ": " << event.get<double>() << "\n";
                break;
            default:
                std::cout << "Unhandled event type: " << event.event_type() << " " << "\n";
                break;
        }
    }
}

void as_a_filtered_stream_of_json_events()
{
    // Some JSON input data
    std::string data = R"(
        {
           "application": "hiking",
           "reputons": [
           {
               "rater": "HikingAsylum",
               "assertion": "advanced",
               "rated": "Marilyn C",
               "rating": 0.90,
               "generated": 1514862245
             }
           ]
        }
    )";

    std::string name;
    auto filter = [&](const staj_event& ev, const ser_context&) -> bool
    {
        if (ev.event_type() == staj_event_type::key)
        {
            name = ev.get<std::string>();
            return false;
        }
        if (name == "rated")
        {
            name.clear();
            return true;
        }
        return false;
    };

    json_string_cursor cursor(data);

    auto filtered_c = cursor | filter;
    for (; !filtered_c.done(); filtered_c.next())
    {
        const auto& event = filtered_c.current();
        switch (event.event_type())
        {
            case staj_event_type::string_value:
                std::cout << event.get<jsoncons::string_view>() << "\n";
                break;
            default:
                std::cout << "Unhandled event type: " << event.event_type() << " " << "\n";
                break;
        }
    }
}

void playing_around()
{
    // Construct some CBOR using the streaming API
    std::vector<uint8_t> bytes_in;
    cbor::cbor_bytes_encoder encoder(bytes_in);
    encoder.begin_array(); // indefinite length outer array
    encoder.begin_array(3); // a fixed length array
    encoder.string_value("foo");
    encoder.byte_string_value(std::vector<uint8_t>{'P','u','s','s'}); // no suggested conversion
    encoder.string_value("-18446744073709551617", semantic_tag::bigint);
    encoder.end_array();
    encoder.end_array();
    encoder.flush();

    // Print bytes
    std::cout << "(1)\n" << byte_string_view(bytes_in) << "\n\n";
/*
    9f -- Start indefinte length array
      83 -- Array of length 3
        63 -- String value of length 3
          666f6f -- "foo" 
        44 -- Byte string value of length 4
          50757373 -- 'P''u''s''s'
        c3 -- Tag 3 (negative bignum)
          49 -- Byte string value of length 9
            010000000000000000 -- Bytes content
      ff -- "break" 
*/
    // Unpack bytes into a json variant value, and add some more elements
    json j = cbor::decode_cbor<json>(bytes_in);

    // Loop over the rows
    std::cout << "(2)\n";
    for (const json& row : j.array_range())
    {
        std::cout << row << "\n";
    }
    std::cout << "\n";

    // Get bignum value at position 0/2 using jsonpointer 
    json& v = jsonpointer::get(j, "/0/2");
    std::cout << "(3) " << v.as<std::string>() << "\n\n";

    // Print JSON representation with default options
    std::cout << "(4)\n";
    std::cout << pretty_print(j) << "\n\n";

    // Print JSON representation with different options
    auto options = json_options{}
        .byte_string_format(byte_string_chars_format::base64)
        .bignum_format(bignum_format_kind::base64url);
    std::cout << "(5)\n";
    std::cout << pretty_print(j, options) << "\n\n";

    // Add some more elements

    json another_array(json_array_arg); 
    another_array.emplace_back(byte_string_arg, std::vector<uint8_t>({'P','u','s','s'}),
        semantic_tag::base64); // suggested conversion to base64
    another_array.emplace_back("273.15", semantic_tag::bigdec);
    another_array.emplace(another_array.array_range().begin(),"bar"); // place at front

    j.push_back(std::move(another_array));
    std::cout << "(6)\n";
    std::cout << pretty_print(j) << "\n\n";

    // Get big decimal value at position /1/2 using jsonpointer
    json& ref = jsonpointer::get(j, "/1/2");
    std::cout << "(7) " << ref.as<std::string>() << "\n\n";

#if (defined(__GNUC__) || defined(__clang__)) && defined(JSONCONS_HAS_INT128)
    // e.g. if code compiled with GCC and std=gnu++11 (rather than std=c++11)
    __int128 i = j[1][2].as<__int128>();
#endif

    // Get byte string value at position /1/1 as a std::vector<uint8_t>
    auto bstr = j[1][1].as<std::vector<uint8_t>>();
    std::cout << "(8) " << byte_string_view(bstr) << "\n\n";

    // Repack bytes
    std::vector<uint8_t> bytes_out;
    cbor::encode_cbor(j, bytes_out);

    // Print the repacked bytes
    std::cout << "(9)\n" << byte_string_view(bytes_out) << "\n\n";
/*
        82 -- Array of length 2
          83 -- Array of length 3
            63 -- String value of length 3
              666f6f -- "foo" 
            44 -- Byte string value of length 4
              50757373 -- 'P''u''s''s'
            c3 -- Tag 3 (negative bignum)
            49 -- Byte string value of length 9
              010000000000000000 -- Bytes content
          83 -- Another array of length 3
          63 -- String value of length 3
            626172 -- "bar"
          d6 - Expected conversion to base64
          44 -- Byte string value of length 4
            50757373 -- 'P''u''s''s'
          c4 -- Tag 4 (decimal fraction)
            82 -- Array of length 2
              21 -- -2
              19 6ab3 -- 27315
*/
    // Encode to CSV
    auto csv_options = csv::csv_options{}          
        .column_names("Column 1,Column 2,Column 3");

    std::cout << "(10)\n";
    csv::encode_csv(j, std::cout, csv_options);
}

int main()
{
    std::cout << "\nReadme examples\n\n";

    playing_around();
    as_a_variant_like_structure();
    as_a_strongly_typed_cpp_structure();
    with_cursor_level_access();
    as_a_filtered_stream_of_json_events();
    std::cout << '\n';
}

