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#pragma once

#include <concepts>

#include <openvic-dataloader/AbstractSyntaxTree.hpp>
#include <openvic-dataloader/DiagnosticLogger.hpp>

#include <dryad/tree.hpp>

namespace ovdl {
   template<typename T>
   concept IsParseState = requires(
      T t,
      const T ct,
      typename T::ast_type::file_type&& file,
      lexy::buffer<typename T::ast_type::file_type::encoding_type>&& buffer,
      const char* path //
   ) {
      requires IsAst<typename T::ast_type>;
      requires std::derived_from<typename T::diagnostic_logger_type, DiagnosticLogger>;
      { T { std::move(file) } } -> std::same_as<T>;
      { T { std::move(buffer) } } -> std::same_as<T>;
      { T { path, std::move(buffer) } } -> std::same_as<T>;
      { t.ast() } -> std::same_as<typename T::ast_type&>;
      { ct.ast() } -> std::same_as<const typename T::ast_type&>;
      { t.logger() } -> std::same_as<typename T::diagnostic_logger_type&>;
      { ct.logger() } -> std::same_as<const typename T::diagnostic_logger_type&>;
   };

   template<IsAst AstT>
   struct ParseState {
      using ast_type = AstT;
      using diagnostic_logger_type = BasicDiagnosticLogger<typename ast_type::file_type>;

      ParseState(typename ast_type::file_type&& file)
         : _ast { std::move(file) },
           _logger { _ast.file() } {}

      ParseState(lexy::buffer<typename ast_type::file_type::encoding_type>&& buffer)
         : ParseState(typename ast_type::file_type { std::move(buffer) }) {}

      ParseState(const char* path, lexy::buffer<typename ast_type::file_type::encoding_type>&& buffer)
         : ParseState(typename ast_type::file_type { path, std::move(buffer) }) {}

      ast_type& ast() {
         return _ast;
      }

      const ast_type& ast() const {
         return _ast;
      }

      diagnostic_logger_type& logger() {
         return _logger;
      }

      const diagnostic_logger_type& logger() const {
         return _logger;
      }

   private:
      ast_type _ast;
      diagnostic_logger_type _logger;
   };

   template<typename T>
   concept IsFileParseState = requires(
      T t,
      const T ct,
      typename T::file_type&& file,
      lexy::buffer<typename T::file_type::encoding_type>&& buffer,
      const char* path //
   ) {
      requires IsFile<typename T::file_type>;
      requires std::derived_from<typename T::diagnostic_logger_type, DiagnosticLogger>;
      { T { std::move(file) } } -> std::same_as<T>;
      { T { std::move(buffer) } } -> std::same_as<T>;
      { T { path, std::move(buffer) } } -> std::same_as<T>;
      { t.file() } -> std::same_as<typename T::file_type&>;
      { ct.file() } -> std::same_as<const typename T::file_type&>;
      { t.logger() } -> std::same_as<typename T::diagnostic_logger_type&>;
      { ct.logger() } -> std::same_as<const typename T::diagnostic_logger_type&>;
   };

   template<IsFile FileT>
   struct FileParseState {
      using file_type = FileT;
      using diagnostic_logger_type = BasicDiagnosticLogger<file_type>;

      FileParseState(file_type&& file)
         : _file { std::move(file) },
           _logger { file } {}

      FileParseState(lexy::buffer<typename file_type::encoding_type>&& buffer)
         : FileParseState(file_type { std::move(buffer) }) {}

      FileParseState(const char* path, lexy::buffer<typename file_type::encoding_type>&& buffer)
         : FileParseState(file_type { path, std::move(buffer) }) {}

      file_type& file() {
         return _file;
      }

      const file_type& file() const {
         return _file;
      }

      diagnostic_logger_type& logger() {
         return _logger;
      }

      const diagnostic_logger_type& logger() const {
         return _logger;
      }

   private:
      file_type _file;
      diagnostic_logger_type _logger;
   };
}