package lua

import (
	// External
	gopherLua "github.com/yuin/gopher-lua"
	luaJSON "layeh.com/gopher-json"

	// Standard
	"encoding/json"
)

type LUA struct {
	state *gopherLua.LState
}

func NewLUA() (lua LUA) {
	lua.state = gopherLua.NewState()
	luaJSON.Preload(lua.state)
	return
}

func (l *LUA) SetStructInLUA(varname string, strct any) (ltable gopherLua.LValue, err error) {
	// JSON is used as a communications layer.
	j, _ := json.Marshal(strct)

	// JSON is decoded to a Lua table.
	ltable, err = luaJSON.Decode(l.state, j)
	if err != nil {
		return
	}
	l.state.SetGlobal(varname, ltable)
	return
}

func (l *LUA) GetStructFromLUA(ltable gopherLua.LValue, strct any) (err error) {
	j, _ := luaJSON.Encode(ltable)
	err = json.Unmarshal(j, strct)
	return
}

func (l *LUA) GetJSONFromLUA(ltable gopherLua.LValue) (j []byte) {
	j, _ = luaJSON.Encode(ltable)
	return
}


func (l *LUA) Run(script string) (err error) {
	return l.state.DoString(script)
}