#include "ag.h"
#include <iostream>
#include <lua.hpp>
using namespace std;

namespace ag
{
    void register_functions(lua_State * L)
    {
        static const luaL_Reg functions[] = {
            { "print", ag_print },
            { NULL, NULL }
        };
        luaL_register(L, "ag", functions);
    }

    static int ag_print_val(lua_State * L, int index)
    {
        int type = lua_type(L, index);
        switch (type)
        {
            case LUA_TNUMBER:
            case LUA_TSTRING:
                cout << lua_tostring(L, index);
                break;
            case LUA_TTABLE:
                cout << '[';

                /* traverse the table and print the keys/values */
                lua_checkstack(L, 3);
                lua_pushnil(L);
                for (bool first = true; lua_next(L, index) != 0; first = false)
                {
                    if (!first)
                        cout << ", ";
                    ag_print_val(L, -2);
                    cout << " => ";
                    ag_print_val(L, -1);
                    lua_pop(L, 1);
                }

                cout << ']';
                break;
            case LUA_TFUNCTION:
                cout << "<function>";
                break;
            case LUA_TUSERDATA:
                cout << "<userdata>";
                break;
            case LUA_TTHREAD:
                cout << "<thread>";
                break;
            case LUA_TLIGHTUSERDATA:
                cout << "<lightuserdata>";
                break;
        }
    }

    int ag_print(lua_State * L)
    {
        int argc = lua_gettop(L);

        for ( int n = 1; n <= argc; n++ )
        {
            ag_print_val(L, n);
        }
        return 0;
    }
}