#include <lauxlib.h>
#include <lua.h>
#include <lualib.h>
#include <stdio.h>
#include <string.h>

typedef struct {
    float x, y, z;
} Vec3;

Vec3 table_to_vec3(lua_State *L, int index) {
    Vec3 v;
    luaL_checktype(L, index, LUA_TTABLE);

    lua_getfield(L, index, "x");
    v.x = luaL_checknumber(L, -1);
    lua_pop(L, 1);

    lua_getfield(L, index, "y");
    v.y = luaL_checknumber(L, -1);
    lua_pop(L, 1);

    lua_getfield(L, index, "z");
    v.z = luaL_checknumber(L, -1);
    lua_pop(L, 1);

    return v;
}

int printvec(lua_State *L) {
    Vec3 v = table_to_vec3(L, 1);
    // lua_pushnumber(L, a + b);
    printf("{ X: %.1f, Y: %.1f, Z: %.1f }\n", v.x, v.y, v.z);
    return 0; // no return values
}

int main(void) {
    // Vec3 pos = {1.0, 2.0, 3.0};

    // printf("{ X: %.1f, Y: %.1f, Z: %.1f }\n", pos.x, pos.y, pos.z);

    lua_State *L = luaL_newstate();

    luaL_openlibs(L); // Load Lua standard libraries
    // luaL_requiref(L, "_G", luaopen_base, 1);

    // const lua_Number ver = lua_version(NULL);

    // printf("Lua version: %.2f\n", ver);
    // printf("Lua version: %s\n", LUA_VERSION);

    // Register the C function as a global Lua function
    lua_register(L, "printvec", printvec);

    // Run the Lua script
    if (luaL_dofile(L, "script.lua") != LUA_OK) {
        fprintf(stderr, "Error: %s\n", lua_tostring(L, -1));
        lua_pop(L, 1); // remove error message
    }

    lua_close(L);
    return 0;
}