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#pragma once
#include <forstio/templates.hpp>
#include <forstio/codec/schema.hpp>
#include <forstio/codec/data.hpp>
#include <forstio/codec/json/json.hpp>
#include <deque>
#include <fstream>
#include <iostream>
namespace saw {
namespace impl {
struct cli_mode {
struct read {};
struct write {};
struct list {};
};
template<typename Schema, typename Encoding>
struct cli_traverser {
template<typename Traversal>
static error_or<void> traverse(std::deque<std::string>& sch_path, data<Schema,Encoding>& enc_data, std::string& json_data){
return make_error<err::invalid_state>("Exhausted path or structure is not supported as of this moment");
}
};
template<typename Schema, typename Encoding>
struct cli_modifier {
codec<Schema, encode::Json> json;
static_assert( std::is_same_v<Encoding, encode::Native<storage::Default>>, "Not supported" );
error_or<void> read(
std::deque<std::string>& sch_path,
data<Schema, Encoding>& enc_data,
std::string& json_data_str
)
{
{
data<Schema, encode::Json> json_data;
auto eov = json.template encode<Encoding>(enc_data, json_data);
if(eov.is_error()){
return eov;
}
json_data_str = convert_to_string(json_data.get_buffer());
}
return void_t{};
}
error_or<void> write(
std::deque<std::string>& sch_path,
data<Schema, Encoding>& enc_data,
std::string& json_data_str
){
{
/// @todo string to data
data<Schema, encode::Json> json_data{ std::string_view{json_data_str} };
auto eov = json.template decode<Encoding>(json_data, enc_data);
if(eov.is_error()){
return eov;
}
}
return void_t{};
}
};
template<typename Encoding>
struct cli_traverser<schema::String, Encoding> {
using Schema = schema::String;
template<typename Traversal>
static error_or<void> traverse(std::deque<std::string>& sch_path, data<Schema,Encoding>& enc_data, std::string& json_data){
if(not sch_path.empty()){
return make_error<err::invalid_state>("Schema path too long");
}
cli_modifier<Schema, Encoding> mod;
if constexpr (std::is_same_v<Traversal, cli_mode::read>){
return mod.read(sch_path, enc_data, json_data);
} else if constexpr (std::is_same_v<Traversal, cli_mode::write>) {
return mod.write(sch_path, enc_data, json_data);
} else {
return make_error<err::invalid_state>("We only support cli_mode::read and cli_mode::write");
}
}
};
template<typename... T, typename Encoding>
struct cli_traverser<schema::Tuple<T...>, Encoding> {
using Schema = schema::Tuple<T...>;
template<typename Traversal, size_t i>
static error_or<void> traverse_member(std::deque<std::string>& sch_path, data<Schema, Encoding>& enc_data, std::string& json_data){
using Type = typename parameter_pack_type<i,T...>::type;
std::string num_str = std::to_string(i);
if( num_str == sch_path.front() ){
sch_path.pop_front();
return cli_traverser<Type, Encoding>::template traverse<Traversal>(sch_path, enc_data.template get<i>(), json_data);
}
if ( (i+1) < sizeof...(T)){
return traverse_member<Traversal, i+1>(sch_path, enc_data, json_data);
}
return make_error<err::invalid_state>("Didn't find tuple path element");
}
};
/**
* Traverse the path until we hit the end of the provided path
*/
template<typename... T, string_literal... Lits, typename Encoding>
struct cli_traverser<schema::Struct<schema::Member<T,Lits>...>, Encoding> {
using Schema = schema::Struct<schema::Member<T,Lits>...>;
template<typename Traversal, size_t i>
static error_or<void> traverse_member(std::deque<std::string>& sch_path, data<Schema,Encoding>& enc_data, std::string& json_data){
using Type = typename parameter_pack_type<i,T...>::type;
constexpr string_literal Literal = parameter_key_pack_type<i, Lits...>::literal;
if ( Literal.view() == sch_path.front() ){
sch_path.pop_front();
return cli_traverser<Type, Encoding>::template traverse<Traversal>(sch_path, enc_data.template get<Literal>(), json_data);
}
if constexpr ( (i+1) < sizeof...(T) ) {
return traverse_member<Traversal, i+1>(sch_path, enc_data, json_data);
}
return make_error<err::invalid_state>("Didn't find struct path element");
}
template<typename Traversal>
static error_or<void> traverse(std::deque<std::string>& sch_path, data<Schema,Encoding>& enc_data, std::string& json_data){
/**
* If our path is empty, then we have reached the desired destination.
*/
if(sch_path.empty()){
/**
* Decide during this step if we are reading or not
*/
cli_modifier<Schema, Encoding> mod;
if constexpr (std::is_same_v<Traversal, cli_mode::read>){
return mod.read(sch_path, enc_data, json_data);
} else if constexpr (std::is_same_v<Traversal, cli_mode::write>) {
return mod.write(sch_path, enc_data, json_data);
} else {
return make_error<err::invalid_state>("We only support cli_mode::read and cli_mode::write");
}
} else {
if constexpr ( sizeof...(T) > 0 ){
return traverse_member<Traversal, 0>(sch_path, enc_data, json_data);
}
return make_error<err::invalid_state>("No elements in struct while path isn't empty");
}
return void_t{};
}
};
}
struct parsed_args {
bool read_mode = true;
std::string file_path;
std::deque<std::string> sch_path;
};
template<typename Schema, typename Encoding>
error_or<void> modify_data_on_cli(const std::string_view& mode, const std::string_view& file_path, std::deque<std::string> sch_path, std::string& json_data){
/**
* Read data from file
*/
std::string file_data = [&]() -> std::string {
std::fstream fstr{std::string{file_path}, fstr.binary | fstr.in};
if(!fstr.is_open()){
return {};
}
std::stringstream sstr;
sstr << fstr.rdbuf();
return sstr.str();
}();
if(file_data.empty()){
return make_error<err::not_found>("File exists, but is empty.");
}
data<Schema, Encoding> enc_data{std::string_view{file_data}};
codec<Schema, Encoding> enc_codec;
data<Schema> native_data;
{
auto eov = enc_codec.decode(enc_data, native_data);
if(eov.is_error()){
return eov;
}
}
if (mode == "r") {
{
auto eov = impl::cli_traverser<Schema, encode::Native<storage::Default>>::template traverse<impl::cli_mode::read>(sch_path, native_data, json_data);
if(eov.is_error()){
return eov;
}
}
} else if (mode == "w") {
{
auto eov = impl::cli_traverser<Schema, encode::Native<storage::Default>>::template traverse<impl::cli_mode::write>(sch_path, native_data, json_data);
if(eov.is_error()){
return eov;
}
}
{
auto eov = enc_codec.template encode<encode::Native<storage::Default>>(native_data, enc_data);
if(eov.is_error()){
return eov;
}
}
{
std::fstream fstr{std::string{file_path}, fstr.binary | fstr.out | fstr.trunc };
if(!fstr.is_open()){
return make_error<err::invalid_state>("Couldn't open file");
}
std::stringstream sstr;
std::string enc_str = convert_to_string(enc_data.get_buffer());
fstr << enc_str;
fstr.close();
}
} else if (mode == "l"){
{
return make_error<err::not_implemented>("\"l\" is not implemented");
}
}else{
return make_error<err::invalid_state>("Invalid mode");
}
return void_t{};
}
}
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