package config

import (
	"github.com/yuin/gopher-lua"
	"io/ioutil"
	luajson "layeh.com/gopher-json"
	"os"
	"path"
)

var (
	BasePath string
)

func Loader(L *lua.LState) int {
	// register functions to the table
	mod := L.SetFuncs(L.NewTable(), exports)

	// returns the module
	L.Push(mod)
	return 1
}

var exports = map[string]lua.LGFunction{
	"load": loadFunc,
	"save": saveFunc,
}

func loadFunc(L *lua.LState) int {
	name := L.CheckString(1)

	f, err := os.Open(path.Join(BasePath, name+".json"))

	if err != nil {
		L.Push(lua.LNil)
		L.Push(lua.LString(err.Error()))
		return 2
	}

	defer f.Close()

	b, err := ioutil.ReadAll(f)

	if err != nil {
		L.Push(lua.LNil)
		L.Push(lua.LString(err.Error()))
		return 2
	}

	v, err := luajson.Decode(L, b)

	if err != nil {
		L.Push(lua.LNil)
		L.Push(lua.LString(err.Error()))
		return 2
	}

	L.Push(v)
	L.Push(lua.LNil)
	return 2
}

func saveFunc(L *lua.LState) int {
	name := L.CheckString(1)
	value := L.CheckAny(2)

	f, err := os.Create(path.Join(BasePath, name+".json"))

	if err != nil {
		L.Push(lua.LString(err.Error()))
		return 1
	}

	b, err := luajson.Encode(value)

	if err != nil {
		L.Push(lua.LString(err.Error()))
		return 1
	}

	_, err = f.Write(b)

	if err != nil {
		L.Push(lua.LString(err.Error()))
		return 1
	}

	err = f.Close()

	if err != nil {
		L.Push(lua.LString(err.Error()))
		return 1
	}

	return 0
}