#ifndef EOLIAN_MONO_NAME_HELPERS_HH
#define EOLIAN_MONO_NAME_HELPERS_HH

#include <algorithm>
#include <cctype>
#include <iterator>
#include <sstream>
#include <string>
#include <vector>
#include "utils.hh"

#include "grammar/integral.hpp"
#include "grammar/generator.hpp"
#include "grammar/klass_def.hpp"
#include "grammar/list.hpp"
#include "grammar/string.hpp"
#include "grammar/integral.hpp"

using efl::eolian::grammar::as_generator;
using efl::eolian::grammar::string;
using efl::eolian::grammar::lit;
using efl::eolian::grammar::operator*;

namespace eolian_mono {

/* Utility functions for naming things. Compared to the utils.hh, this header has higher level
 * functions, dealing with the knowledge of how to convert the items to the C# style we are using, for
 * example, while being too short to be implemented as full-fledged generators.
 */
namespace name_helpers {

namespace attributes = efl::eolian::grammar::attributes;

namespace detail {
inline bool is_iequal(std::string const& lhs, std::string const& rhs)
{
  return strcasecmp(lhs.c_str(), rhs.c_str()) == 0;
}
inline bool is_equal(std::string const& lhs, std::string const& rhs)
{
  return lhs == rhs;
}
}

inline std::string identity(std::string const& str)
{
  return str;
}

inline std::string escape_keyword(std::string const& name)
{
  using detail::is_equal;
  if(is_equal(name, "delete")
     || is_equal(name, "do")
     || is_equal(name, "lock")
     || is_equal(name, "event")
     || is_equal(name, "in")
     || is_equal(name, "object")
     || is_equal(name, "interface")
     || is_equal(name, "string")
     || is_equal(name, "internal")
     || is_equal(name, "fixed")
     || is_equal(name, "base"))
    return "kw_" + name;

  if (is_equal(name, "Finalize"))
    return name + "Add"; // Eo's Finalize is actually the end of efl_add.
  return name;
}

typedef std::function<std::string(std::string const&)> string_transform_func;

inline std::string join_namespaces(std::vector<std::string> const& namespaces, char separator,
                                   string_transform_func func=identity)
{
   std::stringstream s;
   for (auto&& n : namespaces)
     s << func(n) << separator;

   return s.str();
}

static const std::vector<std::string> verbs =
  {
    "add",
    "get",
    "is",
    "del",
    "thaw",
    "freeze",
    "save",
    "wait",
    "eject",
    "raise",
    "lower",
    "load",
    "dup",
    "reset",
    "unload",
    "close",
    "set",
    "interpolate",
    "has",
    "grab",
    "check",
    "find",
    "ungrab",
    "unset",
    "clear",
    "pop",
    "new",
    "peek",
    "push",
    "update",
    "show",
    "move",
    "hide",
    "calculate",
    "resize",
    "attach",
    "pack",
    "unpack",
    "emit",
    "call",
    "append"
  };

const std::vector<std::string> not_verbs =
  {
    "below",
    "above",
    "name",
    "unfreezable",
    "value",
    "r",
    "g",
    "b",
    "a",
    "finalize",
    "destructor",
    "to",
    "circle",
    "rect",
    "path",
    "commands",
    "type",
    "colorspace"
    "op",
    "type",
    "properties",
    "status",
    "status",
    "relative",
    "ptr",
    "pair",
    "pos",
    "end"
  };

void reorder_verb(std::vector<std::string> &names)
{
  if (names.size() <= 1)
    return;

  std::string verb = names.back();

  if (std::find(verbs.begin(), verbs.end(), verb) != verbs.end())
    {
       names.pop_back();
       names.insert(names.begin(), verb);
    }
}

inline std::string managed_namespace(std::string const& ns)
{
  return escape_keyword(utils::remove_all(ns, '_'));
}

inline std::string managed_method_name(attributes::function_def const& f)
{
  std::vector<std::string> names = utils::split(f.name, '_');

  name_helpers::reorder_verb(names);

  std::string candidate = escape_keyword(utils::to_pascal_case(names));

  // Some eolian methods have the same name as their parent class
  if (candidate == f.klass.eolian_name)
      candidate = "Do" + candidate;

  return candidate;
}

inline std::string alias_full_eolian_name(attributes::alias_def const& alias)
{
   return join_namespaces(alias.namespaces, '.') + alias.eolian_name;
}

inline std::string managed_async_method_name(attributes::function_def const& f)
{
  return managed_method_name(f) + "Async";
}
inline std::string function_ptr_full_eolian_name(attributes::function_def const& func)
{
   return join_namespaces(func.namespaces, '.') + func.name;
}

inline std::string type_full_eolian_name(attributes::regular_type_def const& type)
{
   return join_namespaces(type.namespaces, '.') + type.base_type;
}

inline std::string type_full_managed_name(attributes::regular_type_def const& type)
{
   return join_namespaces(type.namespaces, '.', managed_namespace) + utils::remove_all(type.base_type, '_');
}

inline std::string struct_full_eolian_name(attributes::struct_def const& struct_)
{
   return join_namespaces(struct_.namespaces, '.') + struct_.cxx_name;
}

template<typename T>
inline std::string typedecl_managed_name(T const& item)
{
   return utils::remove_all(item.cxx_name, '_');
}

inline std::string typedecl_managed_name(attributes::function_def const& func)
{
   return utils::remove_all(func.name, '_');
}


inline std::string enum_field_managed_name(std::string name)
{
   std::vector<std::string> names = utils::split(name, '_');
   return utils::to_pascal_case(names);
}

inline std::string to_field_name(std::string const& in)
{
  return utils::capitalize(in);
}

inline std::string managed_part_name(attributes::part_def const& part)
{
  std::vector<std::string> names = utils::split(part.name, '_');
  return utils::to_pascal_case(names);
}

// Class name translation (interface/concrete/inherit/etc)
struct klass_interface_name_generator
{

  template <typename T>
  std::string operator()(T const& klass) const
  {
    return utils::remove_all(klass.eolian_name, '_');
  }
    
  template <typename OutputIterator, typename Attr, typename Context>
  bool generate(OutputIterator sink, Attr const& attribute, Context const& context) const
  {
    return as_generator((*this).operator()<Attr>(attribute)).generate(sink, attributes::unused, context);
  }
} klass_interface_name;
  
struct klass_full_interface_name_generator
{
  template <typename T>
  std::string operator()(T const& klass) const
  {
    return join_namespaces(klass.namespaces, '.', managed_namespace) + klass_interface_name(klass);
  }
    
  template <typename OutputIterator, typename Attr, typename Context>
  bool generate(OutputIterator sink, Attr const& attribute, Context const& context) const
  {
    return as_generator((*this).operator()<Attr>(attribute)).generate(sink, attributes::unused, context);
  }
} klass_full_interface_name;

template<typename T>
inline std::string klass_concrete_name(T const& klass)
{
  std::string name = utils::remove_all(klass.eolian_name, '_');
  if (klass.type == attributes::class_type::regular || klass.type == attributes::class_type::abstract_)
    return name;
  return name + "Concrete";
}

struct klass_full_concrete_name_generator
{
  template <typename T>
  std::string operator()(T const& klass) const
  {
    return join_namespaces(klass.namespaces, '.', managed_namespace) + klass_concrete_name(klass);
  }
    
  template <typename OutputIterator, typename Attr, typename Context>
  bool generate(OutputIterator sink, Attr const& attribute, Context const& context) const
  {
    return as_generator((*this).operator()<Attr>(attribute)).generate(sink, attributes::unused, context);
  }
} klass_full_concrete_name;

struct klass_full_concrete_or_interface_name_generator
{
  template <typename T>
  std::string operator()(T const& klass) const
  {
    switch(klass.type)
    {
    case attributes::class_type::abstract_:
    case attributes::class_type::regular:
      return klass_full_concrete_name(klass);
    }
    return klass_full_interface_name(klass);

  }

  template <typename OutputIterator, typename Context>
  bool generate(OutputIterator, attributes::unused_type, Context const&) const
  {
    return true;
  }

  template <typename OutputIterator, typename Attr, typename Context>
  bool generate(OutputIterator sink, Attr const& attribute, Context const& context) const
  {
    return as_generator((*this).operator()<Attr>(attribute)).generate(sink, attributes::unused, context);
  }
} klass_full_concrete_or_interface_name;

template<typename T>
inline std::string klass_inherit_name(T const& klass)
{
  return klass_concrete_name(klass);
}

template<typename T>
inline std::string klass_native_inherit_name(T const& klass)
{
  return klass_concrete_name(klass) + "NativeInherit";
}

template<typename T>
inline std::string klass_get_name(T const& clsname)
{
  return utils::to_lowercase(join_namespaces(clsname.namespaces, '_') + clsname.eolian_name + "_class_get");
}

inline std::string klass_get_full_name(attributes::klass_name const& clsname)
{
  return klass_full_concrete_name(clsname) + "." + klass_get_name(clsname);
}

// Events
inline std::string managed_event_name(std::string const& name)
{
   return utils::to_pascal_case(utils::split(name, ','), "") + "Evt";
}

inline std::string managed_event_args_short_name(attributes::event_def const& evt)
{
   std::string ret;
     ret = klass_interface_name(evt.klass);
   return ret + name_helpers::managed_event_name(evt.name) + "_Args";
}

inline std::string managed_event_args_name(attributes::event_def evt)
{
   return join_namespaces(evt.klass.namespaces, '.', managed_namespace) +
          managed_event_args_short_name(evt);
}

inline std::string translate_inherited_event_name(const attributes::event_def &evt, const attributes::klass_def &klass)
{
   return join_namespaces(klass.namespaces, '_') + klass_interface_name(klass) + "_" + managed_event_name(evt.name);
}

// Open/close namespaces
template<typename OutputIterator, typename Context>
bool open_namespaces(OutputIterator sink, std::vector<std::string> namespaces, Context context)
{
  std::transform(namespaces.begin(), namespaces.end(), namespaces.begin(), managed_namespace);

  auto open_namespace = *("namespace " << string << " { ") << "\n";
  return as_generator(open_namespace).generate(sink, namespaces, context);
}

template<typename OutputIterator, typename Context>
bool close_namespaces(OutputIterator sink, std::vector<std::string> const& namespaces, Context context)
{
     auto close_namespace = *(lit("} ")) << "\n";
     return as_generator(close_namespace).generate(sink, namespaces, context);
}



} // namespace name_helpers

} // namespace eolian_mono


namespace efl { namespace eolian { namespace grammar {

template <>
struct is_eager_generator<eolian_mono::name_helpers::klass_interface_name_generator> : std::true_type {};
template <>
struct is_generator<eolian_mono::name_helpers::klass_interface_name_generator> : std::true_type {};

template <>
struct is_eager_generator<eolian_mono::name_helpers::klass_full_interface_name_generator> : std::true_type {};
template <>
struct is_generator<eolian_mono::name_helpers::klass_full_interface_name_generator> : std::true_type {};

template <>
struct is_eager_generator<eolian_mono::name_helpers::klass_full_concrete_or_interface_name_generator> : std::true_type {};
template <>
struct is_generator<eolian_mono::name_helpers::klass_full_concrete_or_interface_name_generator> : std::true_type {};

template <>
struct is_eager_generator<eolian_mono::name_helpers::klass_full_concrete_name_generator> : std::true_type {};
template <>
struct is_generator<eolian_mono::name_helpers::klass_full_concrete_name_generator> : std::true_type {};

namespace type_traits {
template <>
struct attributes_needed<struct ::eolian_mono::name_helpers::klass_full_concrete_or_interface_name_generator> : std::integral_constant<int, 1> {};
}
      
} } }
      
#endif