// The object_storage type is responsible for storing variables,
// commands, command lists and other types encoded in torrent::Object
// format.

#ifndef RTORRENT_RPC_OBJECT_STORAGE_H
#define RTORRENT_RPC_OBJECT_STORAGE_H

#include <cstring>
#include <unordered_map>
#include <torrent/object.h>
#include <torrent/utils/unordered_vector.h>

#include "command.h"
#include "fixed_key.h"

namespace rpc {

struct object_storage_node {
  torrent::Object object;
  unsigned int    flags;
};

typedef std::unordered_map<fixed_key_type<64>, object_storage_node, hash_fixed_key_type> object_storage_base_type;

class object_storage : private object_storage_base_type {
public:
  // Should really change rlookup_type into a set with pair values.
  typedef object_storage_base_type                                                         base_type;
  typedef std::map<std::string, torrent::utils::unordered_vector<base_type::value_type*> > rlookup_type;

  using base_type::key_type;
  using base_type::value_type;
  using base_type::iterator;
  using base_type::const_iterator;
  using base_type::local_iterator;
  using base_type::const_local_iterator;

  typedef rlookup_type::iterator              rlookup_iterator;
  typedef rlookup_type::mapped_type::iterator rlookup_mapped_iterator;

  using base_type::begin;
  using base_type::end;
  using base_type::size;
  using base_type::empty;
  using base_type::key_eq;
  using base_type::load_factor;

  // Verify rlookup is static / const.

  using base_type::clear;
  using base_type::find;
  using base_type::erase;

  static const unsigned int flag_generic_type  = 0x1;
  static const unsigned int flag_bool_type     = 0x2;
  static const unsigned int flag_value_type    = 0x4;
  static const unsigned int flag_string_type   = 0x8;
  static const unsigned int flag_list_type     = 0x10;
  static const unsigned int flag_function_type = 0x20;
  static const unsigned int flag_multi_type    = 0x40;

  static const unsigned int mask_type          = 0xff;

  static const unsigned int flag_constant      = 0x100;
  static const unsigned int flag_static        = 0x200;
  static const unsigned int flag_private       = 0x400;
  static const unsigned int flag_rlookup       = 0x800;

  static const size_t key_size = key_type::max_size;

  iterator find_raw_string(const torrent::raw_string& key);
  iterator find_raw_string_const(const torrent::raw_string& key, unsigned int type = 0);
  iterator find_raw_string_mutable(const torrent::raw_string& key, unsigned int type = 0);

  iterator insert(const char* key_data, uint32_t key_size, const torrent::Object& object, unsigned int flags);
  iterator insert_c_str(const char* key, const torrent::Object& object, unsigned int flags) { return insert(key, std::strlen(key), object, flags); }

  iterator insert(const char* key, const torrent::Object& object, unsigned int flags);
  iterator insert(const torrent::raw_string& key, const torrent::Object& object, unsigned int flags);
  iterator insert_str(const std::string& key, const torrent::Object& object, unsigned int flags);

  bool     has_flag(const torrent::raw_string& key, unsigned int flag);
  bool     has_flag_str(const std::string& key, unsigned int flag) { return has_flag(torrent::raw_string::from_string(key), flag); }

  void     enable_flag(const torrent::raw_string& key, unsigned int flag);
  void     enable_flag_str(const std::string& key, unsigned int flag) { enable_flag(torrent::raw_string::from_string(key), flag); }

  // Access functions that throw on error.

  const torrent::Object& get(const torrent::raw_string& key);
  const torrent::Object& get_c_str(const char* str)  { return get(torrent::raw_string(str, std::strlen(str))); }
  const torrent::Object& get_str(const std::string& str) { return get(torrent::raw_string(str.data(), str.size())); }

  const torrent::Object& set_bool(const torrent::raw_string& key, int64_t object);
  const torrent::Object& set_c_str_bool(const char* str, int64_t object) { return set_bool(torrent::raw_string::from_c_str(str), object); }
  const torrent::Object& set_str_bool(const std::string& str, int64_t object) { return set_bool(torrent::raw_string::from_string(str), object); }

  const torrent::Object& set_value(const torrent::raw_string& key, int64_t object);
  const torrent::Object& set_c_str_value(const char* str, int64_t object) { return set_value(torrent::raw_string::from_string(str), object); }
  const torrent::Object& set_str_value(const std::string& str, int64_t object) { return set_value(torrent::raw_string::from_string(str), object); }

  const torrent::Object& set_string(const torrent::raw_string& key, const std::string& object);
  const torrent::Object& set_c_str_string(const char* str, const std::string& object) { return set_string(torrent::raw_string::from_c_str(str), object); }
  const torrent::Object& set_str_string(const std::string& str, const std::string& object) { return set_string(torrent::raw_string::from_string(str), object); }

  const torrent::Object& set_list(const torrent::raw_string& key, const torrent::Object::list_type& object);
  const torrent::Object& set_c_str_list(const char* str, const torrent::Object::list_type& object) { return set_list(torrent::raw_string::from_c_str(str), object); }
  const torrent::Object& set_str_list(const std::string& str, const torrent::Object::list_type& object) { return set_list(torrent::raw_string::from_string(str), object); }

  void                   list_push_back(const torrent::raw_string& key, const torrent::Object& object);
  void                   list_push_back_str(const std::string& str, const torrent::Object& object) { list_push_back(torrent::raw_string::from_string(str), object); }

  // Functions callers:
  torrent::Object        call_function(const torrent::raw_string& key, target_type target, const torrent::Object& object);
  torrent::Object        call_function_str(const std::string& key, target_type target, const torrent::Object& object);

  // Single-command function:

  const torrent::Object& set_function(const torrent::raw_string& key, const std::string& object);
  const torrent::Object& set_str_function(const std::string& key, const std::string& object);

  // Multi-command function:
  bool                   has_multi_key(const torrent::raw_string& key, const std::string& cmd_key);
  void                   erase_multi_key(const torrent::raw_string& key, const std::string& cmd_key);
  void                   set_multi_key_obj(const torrent::raw_string& key, const std::string& cmd_key, const torrent::Object& object);

  void                   set_multi_key(const torrent::raw_string& key, const std::string& cmd_key, const std::string& object) { set_multi_key_obj(key, cmd_key, object); }

  bool                   has_str_multi_key(const std::string& key, const std::string& cmd_key);
  void                   erase_str_multi_key(const std::string& key, const std::string& cmd_key);
  void                   set_str_multi_key(const std::string& key, const std::string& cmd_key, const std::string& object);
  void                   set_str_multi_key_obj(const std::string& key, const std::string& cmd_key, const torrent::Object& object);

  torrent::Object::list_type rlookup_list(const std::string& cmd_key);
  torrent::Object            rlookup_obj_list(const std::string& cmd_key) { return torrent::Object::from_list(rlookup_list(cmd_key)); }

  void                       rlookup_clear(const std::string& cmd_key);

private:
  rlookup_type m_rlookup;
};

//
// Implementation:
//

template <size_t MaxSize> inline void
fixed_key_type<MaxSize>::set_data(const value_type* src_data, size_type src_size) {
  if (src_size >= max_size) {
    new (this) fixed_key_type();
    return;
  }

  m_size = src_size;
  std::memcpy(m_data, src_data, m_size);
  m_data[m_size] = '\0';
}

template <size_t MaxSize> inline void
fixed_key_type<MaxSize>::set_c_str(const value_type* src_data) {
  value_type* itr = m_data;
  const value_type* last = m_data + max_size;

  while (itr != last && *src_data != '\0')
    *itr++ = *src_data++;

  *itr = '\0';
  m_size = std::distance(m_data, itr);
}

template <size_t MaxSize> inline void
fixed_key_type<MaxSize>::set_c_str(const value_type* src_data, size_type src_size) {
  if (src_size >= max_size) {
    new (this) fixed_key_type();
    return;
  }

  m_size = src_size;
  std::memcpy(m_data, src_data, m_size + 1);
}

inline object_storage::iterator
object_storage::insert(const char* key, const torrent::Object& object, unsigned int flags) {
  return insert(key, std::strlen(key), object, flags);
}

inline object_storage::iterator
object_storage::insert(const torrent::raw_string& key, const torrent::Object& object, unsigned int flags) {
  return insert(key.data(), key.size(), object, flags);
}

inline object_storage::iterator
object_storage::insert_str(const std::string& key, const torrent::Object& object, unsigned int flags) {
  return insert(key.data(), key.size(), object, flags);
}

inline torrent::Object
object_storage::call_function_str(const std::string& key, target_type target, const torrent::Object& object) {
  return call_function(torrent::raw_string::from_string(key), target, object);
}

inline const torrent::Object&
object_storage::set_str_function(const std::string& key, const std::string& object) {
  return set_function(torrent::raw_string::from_string(key), object);
}

inline bool
object_storage::has_str_multi_key(const std::string& key, const std::string& cmd_key) {
  return has_multi_key(torrent::raw_string::from_string(key), cmd_key);
}

inline void
object_storage::erase_str_multi_key(const std::string& key, const std::string& cmd_key) {
  erase_multi_key(torrent::raw_string::from_string(key), cmd_key);
}

inline void
object_storage::set_str_multi_key(const std::string& key, const std::string& cmd_key, const std::string& object) {
  return set_multi_key_obj(torrent::raw_string::from_string(key), cmd_key, object);
}

inline void
object_storage::set_str_multi_key_obj(const std::string& key, const std::string& cmd_key, const torrent::Object& object) {
  return set_multi_key_obj(torrent::raw_string::from_string(key), cmd_key, object);
}

}

#endif