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#pragma once

#include <cstddef>
#include <filesystem>
#include <memory>
#include <optional>
#include <ostream>
#include <string>
#include <string_view>

#include <openvic-dataloader/Error.hpp>
#include <openvic-dataloader/NodeLocation.hpp>
#include <openvic-dataloader/Parser.hpp>
#include <openvic-dataloader/detail/Concepts.hpp>
#include <openvic-dataloader/detail/Encoding.hpp>
#include <openvic-dataloader/detail/ErrorRange.hpp>
#include <openvic-dataloader/v2script/AbstractSyntaxTree.hpp>

#include <dryad/node.hpp>

namespace ovdl::v2script {
   using FileTree = ast::FileTree;
   using FilePosition = ovdl::FilePosition;

   class Parser final : public detail::BasicParser {
   public:
      Parser();
      Parser(std::basic_ostream<char>& error_stream);

      static Parser from_buffer(const char* data, std::size_t size, std::optional<detail::Encoding> encoding_fallback = std::nullopt);
      static Parser from_buffer(const char* start, const char* end, std::optional<detail::Encoding> encoding_fallback = std::nullopt);
      static Parser from_string(const std::string_view string, std::optional<detail::Encoding> encoding_fallback = std::nullopt);
      static Parser from_file(const char* path, std::optional<detail::Encoding> encoding_fallback = std::nullopt);
      static Parser from_file(const std::filesystem::path& path, std::optional<detail::Encoding> encoding_fallback = std::nullopt);

      Parser& load_from_buffer(const char* data, std::size_t size, std::optional<detail::Encoding> encoding_fallback = std::nullopt);
      Parser& load_from_buffer(const char* start, const char* end, std::optional<detail::Encoding> encoding_fallback = std::nullopt);
      Parser& load_from_string(const std::string_view string, std::optional<detail::Encoding> encoding_fallback = std::nullopt);
      Parser& load_from_file(const char* path, std::optional<detail::Encoding> encoding_fallback = std::nullopt);
      Parser& load_from_file(const std::filesystem::path& path, std::optional<detail::Encoding> encoding_fallback = std::nullopt);

      constexpr Parser& load_from_file(const detail::HasCstr auto& path, std::optional<detail::Encoding> encoding_fallback = std::nullopt) {
         return load_from_file(path.c_str(), encoding_fallback);
      }

      bool simple_parse();
      bool event_parse();
      bool decision_parse();
      bool lua_defines_parse();

      const FileTree* get_file_node() const;

      std::string_view value(const ovdl::v2script::ast::FlatValue* node) const;
      ovdl::symbol<char> find_intern(std::string_view string) const;

      std::string make_native_string() const;
      std::string make_list_string() const;

      const FilePosition get_position(const ast::Node* node) const;

      using error_range = ovdl::detail::error_range<error::Root>;
      Parser::error_range get_errors() const;

      std::string_view error(const ovdl::error::Error* error) const;

      const FilePosition get_error_position(const error::Error* error) const;

      void print_errors_to(std::basic_ostream<char>& stream) const;

      Parser(Parser&&);
      Parser& operator=(Parser&&);

      ~Parser();

   private:
      class ParseHandler;
      std::unique_ptr<ParseHandler> _parse_handler;

      template<typename... Args>
      constexpr void _run_load_func(detail::LoadCallback<Parser::ParseHandler*, Args...> auto func, Args... args);
   };
}