/*
* (C) 2018 Ribose Inc
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/parsing.h>
#include <botan/exceptn.h>

namespace Botan {

std::map<std::string, std::string> read_kv(const std::string& kv)
   {
   std::map<std::string, std::string> m;
   if(kv == "")
      return m;

   std::vector<std::string> parts;

   try
      {
      parts = split_on(kv, ',');
      }
   catch(std::exception&)
      {
      throw Invalid_Argument("Bad KV spec");
      }

   bool escaped = false;
   bool reading_key = true;
   std::string cur_key;
   std::string cur_val;

   for(char c : kv)
      {
      if(c == '\\' && !escaped)
         {
         escaped = true;
         }
      else if(c == ',' && !escaped)
         {
         if(cur_key.empty())
            throw Invalid_Argument("Bad KV spec empty key");

         if(m.find(cur_key) != m.end())
            throw Invalid_Argument("Bad KV spec duplicated key");
         m[cur_key] = cur_val;
         cur_key = "";
         cur_val = "";
         reading_key = true;
         }
      else if(c == '=' && !escaped)
         {
         if(reading_key == false)
            throw Invalid_Argument("Bad KV spec unexpected equals sign");
         reading_key = false;
         }
      else
         {
         if(reading_key)
            cur_key += c;
         else
            cur_val += c;

         if(escaped)
            escaped = false;
         }
      }

   if(!cur_key.empty())
      {
      if(reading_key == false)
         {
         if(m.find(cur_key) != m.end())
            throw Invalid_Argument("Bad KV spec duplicated key");
         m[cur_key] = cur_val;
         }
      else
         throw Invalid_Argument("Bad KV spec incomplete string");
      }

   return m;
   }

}