// This file is distributed under the BSD License.
// See "license.txt" for details.
// Copyright 2009-2012, Jonathan Turner (jonathan@emptycrate.com)
// Copyright 2009-2018, Jason Turner (jason@emptycrate.com)
// http://www.chaiscript.com

// This is an open source non-commercial project. Dear PVS-Studio, please check it.
// PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com

#ifndef CHAISCRIPT_BOOTSTRAP_HPP_
#define CHAISCRIPT_BOOTSTRAP_HPP_

#include "../utility/utility.hpp"
#include "register_function.hpp"

/// \brief Classes and functions useful for bootstrapping of ChaiScript and adding of new types
namespace chaiscript::bootstrap {
  template<typename T, typename = typename std::enable_if<std::is_array<T>::value>::type>
  void array(const std::string &type, Module &m) {
    using ReturnType = typename std::remove_extent<T>::type;

    m.add(user_type<T>(), type);
    m.add(fun([](T &t, size_t index) -> ReturnType & {
            constexpr const auto extent = std::extent<T>::value;
            if (extent > 0 && index >= extent) {
              throw std::range_error("Array index out of range. Received: " + std::to_string(index) + " expected < "
                                     + std::to_string(extent));
            } else {
              return t[index];
            }
          }),
          "[]");

    m.add(fun([](const T &t, size_t index) -> const ReturnType & {
            constexpr const auto extent = std::extent<T>::value;
            if (extent > 0 && index >= extent) {
              throw std::range_error("Array index out of range. Received: " + std::to_string(index) + " expected < "
                                     + std::to_string(extent));
            } else {
              return t[index];
            }
          }),
          "[]");

    m.add(fun([](const T &) { return std::extent<T>::value; }), "size");
  }

  /// \brief Adds a copy constructor for the given type to the given Model
  /// \param[in] type The name of the type. The copy constructor will be named "type".
  /// \param[in,out] m The Module to add the copy constructor to
  /// \tparam T The type to add a copy constructor for
  /// \returns The passed in Module
  template<typename T>
  void copy_constructor(const std::string &type, Module &m) {
    m.add(constructor<T(const T &)>(), type);
  }

  /// \brief Add all comparison operators for the templated type. Used during bootstrap, also available to users.
  /// \tparam T Type to create comparison operators for
  /// \param[in,out] m module to add comparison operators to
  /// \returns the passed in Module.
  template<typename T>
  void opers_comparison(Module &m) {
    operators::equal<T>(m);
    operators::greater_than<T>(m);
    operators::greater_than_equal<T>(m);
    operators::less_than<T>(m);
    operators::less_than_equal<T>(m);
    operators::not_equal<T>(m);
  }

  /// \brief Adds default and copy constructors for the given type
  /// \param[in] type The name of the type to add the constructors for.
  /// \param[in,out] m The Module to add the basic constructors to
  /// \tparam T Type to generate basic constructors for
  /// \returns The passed in Module
  /// \sa copy_constructor
  /// \sa constructor
  template<typename T>
  void basic_constructors(const std::string &type, Module &m) {
    m.add(constructor<T()>(), type);
    copy_constructor<T>(type, m);
  }

  /// \brief Adds a constructor for a POD type
  /// \tparam T The type to add the constructor for
  /// \param[in] type The name of the type
  /// \param[in,out] m The Module to add the constructor to
  template<typename T>
  void construct_pod(const std::string &type, Module &m) {
    m.add(fun([](const Boxed_Number &bn) { return bn.get_as<T>(); }), type);
  }

  /// Internal function for converting from a string to a value
  /// uses ostream operator >> to perform the conversion
  template<typename Input>
  Input parse_string(const std::string &i) {
    if constexpr (!std::is_same<Input, wchar_t>::value && !std::is_same<Input, char16_t>::value && !std::is_same<Input, char32_t>::value) {
      std::stringstream ss(i);
      Input t;
      ss >> t;
      return t;
    } else {
      throw std::runtime_error("Parsing of wide characters is not yet supported");
    }
  }

  /// Add all common functions for a POD type. All operators, and
  /// common conversions
  template<typename T>
  void bootstrap_pod_type(const std::string &name, Module &m) {
    m.add(user_type<T>(), name);
    m.add(constructor<T()>(), name);
    construct_pod<T>(name, m);

    m.add(fun(&parse_string<T>), "to_" + name);
    m.add(fun([](const T t) { return t; }), "to_" + name);
  }

  /// "clone" function for a shared_ptr type. This is used in the case
  /// where you do not want to make a deep copy of an object during cloning
  /// but want to instead maintain the shared_ptr. It is needed internally
  /// for handling of Proxy_Function object (that is,
  /// function variables.
  template<typename Type>
  auto shared_ptr_clone(const std::shared_ptr<Type> &p) {
    return p;
  }

  /// Specific version of shared_ptr_clone just for Proxy_Functions
  template<typename Type>
  std::shared_ptr<std::remove_const_t<Type>> shared_ptr_unconst_clone(const std::shared_ptr<std::add_const_t<Type>> &p) {
    return std::const_pointer_cast<typename std::remove_const<Type>::type>(p);
  }

  /// Assignment function for shared_ptr objects, does not perform a copy of the
  /// object pointed to, instead maintains the shared_ptr concept.
  /// Similar to shared_ptr_clone. Used for Proxy_Function.
  template<typename Type>
  Boxed_Value ptr_assign(Boxed_Value lhs, const std::shared_ptr<Type> &rhs) {
    if (lhs.is_undef() || (!lhs.get_type_info().is_const() && lhs.get_type_info().bare_equal(chaiscript::detail::Get_Type_Info<Type>::get()))) {
      lhs.assign(Boxed_Value(rhs));
      return lhs;
    } else {
      throw exception::bad_boxed_cast("type mismatch in pointer assignment");
    }
  }

  /// Class consisting of only static functions. All default bootstrapping occurs
  /// from this class.
  class Bootstrap {
  private:
    /// Function allowing for assignment of an unknown type to any other value
    static Boxed_Value unknown_assign(Boxed_Value lhs, Boxed_Value rhs) {
      if (lhs.is_undef()) {
        return (lhs.assign(rhs));
      } else {
        throw exception::bad_boxed_cast("boxed_value has a set type already");
      }
    }

    static void print(const std::string &s) noexcept { fwrite(s.c_str(), 1, s.size(), stdout); }

    static void println(const std::string &s) noexcept { puts(s.c_str()); }

    /// Add all arithmetic operators for PODs
    static void opers_arithmetic_pod(Module &m) {
      m.add(fun(&Boxed_Number::equals), "==");
      m.add(fun(&Boxed_Number::less_than), "<");
      m.add(fun(&Boxed_Number::greater_than), ">");
      m.add(fun(&Boxed_Number::greater_than_equal), ">=");
      m.add(fun(&Boxed_Number::less_than_equal), "<=");
      m.add(fun(&Boxed_Number::not_equal), "!=");

      m.add(fun(&Boxed_Number::pre_decrement), "--");
      m.add(fun(&Boxed_Number::pre_increment), "++");
      m.add(fun(&Boxed_Number::sum), "+");
      m.add(fun(&Boxed_Number::unary_plus), "+");
      m.add(fun(&Boxed_Number::unary_minus), "-");
      m.add(fun(&Boxed_Number::difference), "-");
      m.add(fun(&Boxed_Number::assign_bitwise_and), "&=");
      m.add(fun(&Boxed_Number::assign), "=");
      m.add(fun(&Boxed_Number::assign_bitwise_or), "|=");
      m.add(fun(&Boxed_Number::assign_bitwise_xor), "^=");
      m.add(fun(&Boxed_Number::assign_remainder), "%=");
      m.add(fun(&Boxed_Number::assign_shift_left), "<<=");
      m.add(fun(&Boxed_Number::assign_shift_right), ">>=");
      m.add(fun(&Boxed_Number::bitwise_and), "&");
      m.add(fun(&Boxed_Number::bitwise_complement), "~");
      m.add(fun(&Boxed_Number::bitwise_xor), "^");
      m.add(fun(&Boxed_Number::bitwise_or), "|");
      m.add(fun(&Boxed_Number::assign_product), "*=");
      m.add(fun(&Boxed_Number::assign_quotient), "/=");
      m.add(fun(&Boxed_Number::assign_sum), "+=");
      m.add(fun(&Boxed_Number::assign_difference), "-=");
      m.add(fun(&Boxed_Number::quotient), "/");
      m.add(fun(&Boxed_Number::shift_left), "<<");
      m.add(fun(&Boxed_Number::product), "*");
      m.add(fun(&Boxed_Number::remainder), "%");
      m.add(fun(&Boxed_Number::shift_right), ">>");
    }

    /// Create a bound function object. The first param is the function to bind
    /// the remaining parameters are the args to bind into the result
    static Boxed_Value bind_function(const Function_Params &params) {
      if (params.empty()) {
        throw exception::arity_error(0, 1);
      }

      Const_Proxy_Function f = boxed_cast<Const_Proxy_Function>(params[0]);

      if (f->get_arity() != -1 && size_t(f->get_arity()) != params.size() - 1) {
        throw exception::arity_error(static_cast<int>(params.size()), f->get_arity());
      }

      return Boxed_Value(Const_Proxy_Function(
          std::make_shared<dispatch::Bound_Function>(std::move(f), std::vector<Boxed_Value>(params.begin() + 1, params.end()))));
    }

    static bool has_guard(const Const_Proxy_Function &t_pf) noexcept {
      auto pf = std::dynamic_pointer_cast<const dispatch::Dynamic_Proxy_Function>(t_pf);
      return pf && pf->has_guard();
    }

    static Const_Proxy_Function get_guard(const Const_Proxy_Function &t_pf) {
      const auto pf = std::dynamic_pointer_cast<const dispatch::Dynamic_Proxy_Function>(t_pf);
      if (pf && pf->get_guard()) {
        return pf->get_guard();
      } else {
        throw std::runtime_error("Function does not have a guard");
      }
    }

    template<typename FunctionType>
    static std::vector<Boxed_Value> do_return_boxed_value_vector(FunctionType f, const dispatch::Proxy_Function_Base *b) {
      auto v = (b->*f)();

      std::vector<Boxed_Value> vbv;

      for (const auto &o : v) {
        vbv.push_back(const_var(o));
      }

      return vbv;
    }

    static bool has_parse_tree(const chaiscript::Const_Proxy_Function &t_pf) noexcept {
      const auto pf = std::dynamic_pointer_cast<const chaiscript::dispatch::Dynamic_Proxy_Function>(t_pf);
      return bool(pf);
    }

    static const chaiscript::AST_Node &get_parse_tree(const chaiscript::Const_Proxy_Function &t_pf) {
      const auto pf = std::dynamic_pointer_cast<const chaiscript::dispatch::Dynamic_Proxy_Function>(t_pf);
      if (pf) {
        return pf->get_parse_tree();
      } else {
        throw std::runtime_error("Function does not have a parse tree");
      }
    }

    template<typename Function>
    static auto return_boxed_value_vector(const Function &f) {
      return [f](const dispatch::Proxy_Function_Base *b) { return do_return_boxed_value_vector(f, b); };
    }

  public:
    /// \brief perform all common bootstrap functions for std::string, void and POD types
    /// \param[in,out] m Module to add bootstrapped functions to
    /// \returns passed in Module
    static void bootstrap(Module &m) {
      m.add(user_type<void>(), "void");
      m.add(user_type<bool>(), "bool");
      m.add(user_type<Boxed_Value>(), "Object");
      m.add(user_type<Boxed_Number>(), "Number");
      m.add(user_type<Proxy_Function>(), "Function");
      m.add(user_type<dispatch::Assignable_Proxy_Function>(), "Assignable_Function");
      m.add(user_type<std::exception>(), "exception");

      m.add(fun(&dispatch::Proxy_Function_Base::get_arity), "get_arity");
      m.add(fun(&dispatch::Proxy_Function_Base::operator==), "==");

      m.add(fun(return_boxed_value_vector(&dispatch::Proxy_Function_Base::get_param_types)), "get_param_types");
      m.add(fun(return_boxed_value_vector(&dispatch::Proxy_Function_Base::get_contained_functions)), "get_contained_functions");

      m.add(fun([](const std::exception &e) { return std::string(e.what()); }), "what");

      m.add(user_type<std::out_of_range>(), "out_of_range");
      m.add(user_type<std::logic_error>(), "logic_error");
      m.add(chaiscript::base_class<std::exception, std::logic_error>());
      m.add(chaiscript::base_class<std::logic_error, std::out_of_range>());
      m.add(chaiscript::base_class<std::exception, std::out_of_range>());

      m.add(user_type<std::runtime_error>(), "runtime_error");
      m.add(chaiscript::base_class<std::exception, std::runtime_error>());

      m.add(constructor<std::runtime_error(const std::string &)>(), "runtime_error");

      m.add(user_type<dispatch::Dynamic_Object>(), "Dynamic_Object");
      m.add(constructor<dispatch::Dynamic_Object(const std::string &)>(), "Dynamic_Object");
      m.add(constructor<dispatch::Dynamic_Object()>(), "Dynamic_Object");
      m.add(fun(&dispatch::Dynamic_Object::get_type_name), "get_type_name");
      m.add(fun(&dispatch::Dynamic_Object::get_attrs), "get_attrs");
      m.add(fun(&dispatch::Dynamic_Object::set_explicit), "set_explicit");
      m.add(fun(&dispatch::Dynamic_Object::is_explicit), "is_explicit");
      m.add(fun(&dispatch::Dynamic_Object::has_attr), "has_attr");

      m.add(fun(static_cast<Boxed_Value &(dispatch::Dynamic_Object::*)(const std::string &)>(&dispatch::Dynamic_Object::get_attr)), "get_attr");
      m.add(fun(static_cast<const Boxed_Value &(dispatch::Dynamic_Object::*)(const std::string &) const>(&dispatch::Dynamic_Object::get_attr)),
            "get_attr");

      m.add(fun(static_cast<Boxed_Value &(dispatch::Dynamic_Object::*)(const std::string &)>(&dispatch::Dynamic_Object::method_missing)),
            "method_missing");
      m.add(fun(static_cast<const Boxed_Value &(dispatch::Dynamic_Object::*)(const std::string &) const>(
                &dispatch::Dynamic_Object::method_missing)),
            "method_missing");

      m.add(fun(static_cast<Boxed_Value &(dispatch::Dynamic_Object::*)(const std::string &)>(&dispatch::Dynamic_Object::get_attr)), "[]");
      m.add(fun(static_cast<const Boxed_Value &(dispatch::Dynamic_Object::*)(const std::string &) const>(&dispatch::Dynamic_Object::get_attr)),
            "[]");

      m.eval(R"chaiscript(
          def Dynamic_Object::clone() {
            auto &new_o = Dynamic_Object(this.get_type_name());
            for_each(this.get_attrs(), fun[new_o](x) { new_o.get_attr(x.first) = x.second; } );
            new_o;
          }

          def `=`(Dynamic_Object lhs, Dynamic_Object rhs) : lhs.get_type_name() == rhs.get_type_name()
          {
            for_each(rhs.get_attrs(), fun[lhs](x) { lhs.get_attr(x.first) = clone(x.second); } );
          }

          def `!=`(Dynamic_Object lhs, Dynamic_Object rhs) : lhs.get_type_name() == rhs.get_type_name()
          {
            var rhs_attrs := rhs.get_attrs();
            var lhs_attrs := lhs.get_attrs();

            if (rhs_attrs.size() != lhs_attrs.size()) {
              true;
            } else {
              return any_of(rhs_attrs, fun[lhs](x) { !lhs.has_attr(x.first) || lhs.get_attr(x.first) != x.second; } );
            }
          }

          def `==`(Dynamic_Object lhs, Dynamic_Object rhs) : lhs.get_type_name() == rhs.get_type_name()
          {
            var rhs_attrs := rhs.get_attrs();
            var lhs_attrs := lhs.get_attrs();

            if (rhs_attrs.size() != lhs_attrs.size()) {
              false;
            } else {
              return all_of(rhs_attrs, fun[lhs](x) { lhs.has_attr(x.first) && lhs.get_attr(x.first) == x.second; } );
            }
          }
        )chaiscript");

      m.add(fun(&has_guard), "has_guard");
      m.add(fun(&get_guard), "get_guard");

      m.add(fun(&Boxed_Value::is_undef), "is_var_undef");
      m.add(fun(&Boxed_Value::is_null), "is_var_null");
      m.add(fun(&Boxed_Value::is_const), "is_var_const");
      m.add(fun(&Boxed_Value::is_ref), "is_var_reference");
      m.add(fun(&Boxed_Value::is_pointer), "is_var_pointer");
      m.add(fun(&Boxed_Value::is_return_value), "is_var_return_value");
      m.add(fun(&Boxed_Value::reset_return_value), "reset_var_return_value");
      m.add(fun(&Boxed_Value::is_type), "is_type");
      m.add(fun(&Boxed_Value::get_attr), "get_var_attr");
      m.add(fun(&Boxed_Value::copy_attrs), "copy_var_attrs");
      m.add(fun(&Boxed_Value::clone_attrs), "clone_var_attrs");

      m.add(fun(&Boxed_Value::get_type_info), "get_type_info");
      m.add(user_type<Type_Info>(), "Type_Info");
      m.add(constructor<Type_Info(const Type_Info &)>(), "Type_Info");

      operators::equal<Type_Info>(m);

      m.add(fun(&Type_Info::is_const), "is_type_const");
      m.add(fun(&Type_Info::is_reference), "is_type_reference");
      m.add(fun(&Type_Info::is_void), "is_type_void");
      m.add(fun(&Type_Info::is_undef), "is_type_undef");
      m.add(fun(&Type_Info::is_pointer), "is_type_pointer");
      m.add(fun(&Type_Info::is_arithmetic), "is_type_arithmetic");
      m.add(fun(&Type_Info::name), "cpp_name");
      m.add(fun(&Type_Info::bare_name), "cpp_bare_name");
      m.add(fun(&Type_Info::bare_equal), "bare_equal");

      basic_constructors<bool>("bool", m);
      operators::assign<bool>(m);
      operators::equal<bool>(m);
      operators::not_equal<bool>(m);

      m.add(fun([](const std::string &s) { return s; }), "to_string");
      m.add(fun([](const bool b) { return std::string(b ? "true" : "false"); }), "to_string");
      m.add(fun(&unknown_assign), "=");
      m.add(fun([](const Boxed_Value &bv) { throw bv; }), "throw");

      m.add(fun([](const char c) { return std::string(1, c); }), "to_string");
      m.add(fun(&Boxed_Number::to_string), "to_string");

      bootstrap_pod_type<double>("double", m);
      bootstrap_pod_type<long double>("long_double", m);
      bootstrap_pod_type<float>("float", m);
      bootstrap_pod_type<int>("int", m);
      bootstrap_pod_type<long>("long", m);
      bootstrap_pod_type<unsigned int>("unsigned_int", m);
      bootstrap_pod_type<unsigned long>("unsigned_long", m);
      bootstrap_pod_type<long long>("long_long", m);
      bootstrap_pod_type<unsigned long long>("unsigned_long_long", m);
      bootstrap_pod_type<size_t>("size_t", m);
      bootstrap_pod_type<char>("char", m);
      bootstrap_pod_type<wchar_t>("wchar_t", m);
      bootstrap_pod_type<char16_t>("char16_t", m);
      bootstrap_pod_type<char32_t>("char32_t", m);
      bootstrap_pod_type<std::int8_t>("int8_t", m);
      bootstrap_pod_type<std::int16_t>("int16_t", m);
      bootstrap_pod_type<std::int32_t>("int32_t", m);
      bootstrap_pod_type<std::int64_t>("int64_t", m);
      bootstrap_pod_type<std::uint8_t>("uint8_t", m);
      bootstrap_pod_type<std::uint16_t>("uint16_t", m);
      bootstrap_pod_type<std::uint32_t>("uint32_t", m);
      bootstrap_pod_type<std::uint64_t>("uint64_t", m);

      operators::logical_compliment<bool>(m);

      opers_arithmetic_pod(m);

      m.add(fun(&Build_Info::version_major), "version_major");
      m.add(fun(&Build_Info::version_minor), "version_minor");
      m.add(fun(&Build_Info::version_patch), "version_patch");
      m.add(fun(&Build_Info::version), "version");
      m.add(fun(&Build_Info::compiler_version), "compiler_version");
      m.add(fun(&Build_Info::compiler_name), "compiler_name");
      m.add(fun(&Build_Info::compiler_id), "compiler_id");
      m.add(fun(&Build_Info::debug_build), "debug_build");

      m.add(fun(&print), "print_string");
      m.add(fun(&println), "println_string");

      m.add(dispatch::make_dynamic_proxy_function(&bind_function), "bind");

      m.add(fun(&shared_ptr_unconst_clone<dispatch::Proxy_Function_Base>), "clone");
      m.add(fun(&ptr_assign<std::remove_const<dispatch::Proxy_Function_Base>::type>), "=");
      m.add(fun(&ptr_assign<std::add_const<dispatch::Proxy_Function_Base>::type>), "=");
      m.add(chaiscript::base_class<dispatch::Proxy_Function_Base, dispatch::Assignable_Proxy_Function>());
      m.add(fun([](dispatch::Assignable_Proxy_Function &t_lhs, const std::shared_ptr<const dispatch::Proxy_Function_Base> &t_rhs) {
              t_lhs.assign(t_rhs);
            }),
            "=");

      m.add(fun(&Boxed_Value::type_match), "type_match");

      m.add(chaiscript::fun(&has_parse_tree), "has_parse_tree");
      m.add(chaiscript::fun(&get_parse_tree), "get_parse_tree");

      m.add(chaiscript::base_class<std::runtime_error, chaiscript::exception::eval_error>());
      m.add(chaiscript::base_class<std::exception, chaiscript::exception::eval_error>());

      m.add(chaiscript::user_type<chaiscript::exception::arithmetic_error>(), "arithmetic_error");
      m.add(chaiscript::base_class<std::runtime_error, chaiscript::exception::arithmetic_error>());
      m.add(chaiscript::base_class<std::exception, chaiscript::exception::arithmetic_error>());

      //        chaiscript::bootstrap::standard_library::vector_type<std::vector<std::shared_ptr<chaiscript::AST_Node> >
      //        >("AST_NodeVector", m);

      chaiscript::utility::add_class<chaiscript::exception::eval_error>(m,
                                                                        "eval_error",
                                                                        {},
                                                                        {{fun(&chaiscript::exception::eval_error::reason), "reason"},
                                                                         {fun(&chaiscript::exception::eval_error::pretty_print), "pretty_print"},
                                                                         {fun([](const chaiscript::exception::eval_error &t_eval_error) {
                                                                            std::vector<Boxed_Value> retval;
                                                                            std::transform(t_eval_error.call_stack.begin(),
                                                                                           t_eval_error.call_stack.end(),
                                                                                           std::back_inserter(retval),
                                                                                           &chaiscript::var<const chaiscript::AST_Node_Trace &>);
                                                                            return retval;
                                                                          }),
                                                                          "call_stack"}});

      chaiscript::utility::add_class<chaiscript::File_Position>(m,
                                                                "File_Position",
                                                                {constructor<File_Position()>(), constructor<File_Position(int, int)>()},
                                                                {{fun(&File_Position::line), "line"},
                                                                 {fun(&File_Position::column), "column"}});

      chaiscript::utility::add_class<AST_Node>(m,
                                               "AST_Node",
                                               {},
                                               {{fun(&AST_Node::text), "text"},
                                                {fun(&AST_Node::identifier), "identifier"},
                                                {fun(&AST_Node::filename), "filename"},
                                                {fun(&AST_Node::start), "start"},
                                                {fun(&AST_Node::end), "end"},
                                                {fun(&AST_Node::to_string), "to_string"},
                                                {fun([](const chaiscript::AST_Node &t_node) -> std::vector<Boxed_Value> {
                                                   std::vector<Boxed_Value> retval;
                                                   const auto children = t_node.get_children();
                                                   std::transform(children.begin(),
                                                                  children.end(),
                                                                  std::back_inserter(retval),
                                                                  &chaiscript::var<const std::reference_wrapper<chaiscript::AST_Node> &>);
                                                   return retval;
                                                 }),
                                                 "children"}});
    }
  };
} // namespace chaiscript::bootstrap

#endif