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 //
 // Copyright (c) 2019-2024 Ruben Perez Hidalgo (rubenperez038 at gmail dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 //
 
 #ifndef BOOST_MYSQL_IMPL_FORMAT_SQL_HPP
 #define BOOST_MYSQL_IMPL_FORMAT_SQL_HPP
 
 #pragma once
 
 #include <boost/mysql/format_sql.hpp>
 
 #include <boost/mysql/detail/format_sql.hpp>
 
 #include <type_traits>
 
 namespace boost {
 namespace mysql {
 namespace detail {
 
 BOOST_MYSQL_DECL
 std::pair<bool, string_view> parse_range_specifiers(const char* spec_begin, const char* spec_end);
 
 // To use with arguments with a custom formatter
 template <class T>
 bool do_format_custom_formatter(
     const void* obj,
     const char* spec_begin,
     const char* spec_end,
     format_context_base& ctx
 )
 {
     formatter<T> fmt;
     const char* it = fmt.parse(spec_begin, spec_end);
     if (it != spec_end)
     {
         return false;
     }
     fmt.format(*static_cast<const T*>(obj), ctx);
     return true;
 }
 
 // To use with ranges
 template <class T>
 bool do_format_range(const void* obj, const char* spec_begin, const char* spec_end, format_context_base& ctx)
 {
     // Parse specifiers
     auto res = detail::parse_range_specifiers(spec_begin, spec_end);
     if (!res.first)
         return false;
     auto spec = runtime(res.second);
 
     // Retrieve the object. T here may be the actual type U or const U
     auto& value = *const_cast<T*>(static_cast<const T*>(obj));
 
     // Output the sequence
     bool is_first = true;
     for (auto it = std::begin(value); it != std::end(value); ++it)
     {
         if (!is_first)
             ctx.append_raw(", ");
         is_first = false;
         ctx.append_value(*it, spec);
     }
     return true;
 }
 
 // Make formattable_ref formattable
 inline formattable_ref_impl make_formattable_ref_custom(
     formattable_ref v,
     std::true_type  // is format ref
 )
 {
     return access::get_impl(v);
 }
 
 // Make types with custom formatters formattable
 template <class T>
 formattable_ref_impl make_formattable_ref_custom(
     const T& v,
     std::false_type  // is format ref
 )
 {
     // If you're getting an error here, it means that you're passing a type
     // that is not formattable to a SQL formatting function.
     static_assert(
         has_specialized_formatter<T>(),
         "T is not formattable. Please use a formattable type or specialize formatter<T> to make it "
         "formattable"
     );
     return {
         formattable_ref_impl::type_t::fn_and_ptr,
         formattable_ref_impl::fn_and_ptr{&v, &do_format_custom_formatter<T>}
     };
 }
 
 // Make ranges formattable
 template <class T>
 formattable_ref_impl make_formattable_ref_range(
     T&& v,
     std::true_type  // formattable range
 )
 {
     // Although everything is passed as const void*, do_format_range
     // can bypass const-ness for non-const ranges (e.g. filter_view)
     return {
         formattable_ref_impl::type_t::fn_and_ptr,
         formattable_ref_impl::fn_and_ptr{&v, &do_format_range<typename std::remove_reference<T>::type>}
     };
 }
 
 template <class T>
 formattable_ref_impl make_formattable_ref_range(
     const T& v,
     std::false_type  // formattable range
 )
 {
     return make_formattable_ref_custom(v, is_formattable_ref<T>());
 }
 
 // Used for types having is_writable_field<T>
 template <class T>
 formattable_ref_impl make_formattable_ref_writable(
     const T& v,
     std::true_type  // is_writable_field
 )
 {
     // Only string types (and not field_views or optionals) support the string specifiers
     return {
         std::is_convertible<T, string_view>::value ? formattable_ref_impl::type_t::field_with_specs
                                                    : formattable_ref_impl::type_t::field,
         to_field(v)
     };
 }
 
 template <class T>
 formattable_ref_impl make_formattable_ref_writable(
     T&& v,
     std::false_type  // is_writable_field
 )
 {
     return make_formattable_ref_range(std::forward<T>(v), is_formattable_range<T>());
 }
 
 }  // namespace detail
 }  // namespace mysql
 }  // namespace boost
 
 template <class T>
 boost::mysql::detail::formattable_ref_impl boost::mysql::detail::make_formattable_ref(T&& v)
 {
     // Hierarchy:
     //    1. writable field?
     //    2. formattable range?
     //    3. custom formatter or formattable_ref?
     return make_formattable_ref_writable(std::forward<T>(v), is_writable_field_ref<T>());
 }
 
 template <BOOST_MYSQL_FORMATTABLE... Formattable>
 void boost::mysql::format_sql_to(
     format_context_base& ctx,
     constant_string_view format_str,
     Formattable&&... args
 )
 {
     std::initializer_list<format_arg> args_il{
         {string_view(), std::forward<Formattable>(args)}
         ...
     };
     format_sql_to(ctx, format_str, args_il);
 }
 
 template <BOOST_MYSQL_FORMATTABLE... Formattable>
 std::string boost::mysql::format_sql(
     format_options opts,
     constant_string_view format_str,
     Formattable&&... args
 )
 {
     std::initializer_list<format_arg> args_il{
         {string_view(), std::forward<Formattable>(args)}
         ...
     };
     return format_sql(opts, format_str, args_il);
 }
 
 #endif

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