#include "luna.h"
/*extern "C" {
#include <lualib.h>
}
*/

class Account
{
public:
  static const char className[];
  static const Luna<Account>::RegType Register[];

  Account(lua_State* L)
  {
    /* constructor table at top of stack */
    lua_pushstring(L, "balance");
    lua_gettable(L, -2);
    m_balance = lua_tonumber(L, -1);
    lua_pop(L, 2); /* pop constructor table and balance */
  }

  int deposit(lua_State* L)
  {
    std::cout<<"deposit called"<<std::endl;
    m_balance += lua_tonumber(L, -1);
    lua_pop(L, 1);
    return 0;
  }
  int withdraw(lua_State* L)
  {
    m_balance -= lua_tonumber(L, -1);
    lua_pop(L, 1);
    return 0;
  }
  int balance(lua_State* L)
  {
    lua_pushnumber(L, m_balance);
    return 1;
  }

protected:
  double m_balance;
};

const char Account::className[] = "Account";
const Luna<Account>::RegType Account::Register[] =
  {
    {"deposit",  &Account::deposit},
    {"withdraw", &Account::withdraw},
    {"balance",  &Account::balance},
    {0}
  };

class Euclid
{
public:
  static const char className[];
  static const Luna<Euclid>::RegType Register[];

  Euclid(lua_State* L)
  {}

  int gcd(lua_State* L)
  {
    int m = static_cast<int>(lua_tonumber(L, -1));
    int n = static_cast<int>(lua_tonumber(L, -2));
    lua_pop(L, 2);

    /* precondition: m>0 and n>0.  Let g=gcd(m,n). */
    while( m > 0 )
    {
      /* invariant: gcd(m,n)=g */
      if( n > m )
      {
        int t = m; m = n; n = t; /* swap */
      }
      /* m >= n > 0 */
      m -= n;
    }

    lua_pushnumber(L, n);
    return 1;
  }
};

const char Euclid::className[] = "Euclid";
const Luna<Euclid>::RegType Euclid::Register[] =
  {
    {"gcd", &Euclid::gcd},
    {0}
  };

int main(int argc, char* argv[])
{
  lua_State* L = lua_open();
  lua_baselibopen(L);
  Luna<Account>::Register(L);
 // Luna<Euclid>::Register(L);

  lua_dofile(L, argv[1]);


  lua_close(L);
  return 0;
}