package minecraft

import (
	"compress/gzip"
	"github.com/ppacher/nbt"
	lua "github.com/yuin/gopher-lua"
	"meow.tf/residentsleeper/events"
	"os"
	"path"
	"sync"
)

var (
	BasePath  string
	WorldPath string

	uuids    = make(map[string]string)
	uuidLock sync.RWMutex
)

func init() {
	events.On(events.Authenticated, onAuthenticated)
	events.On(events.Leave, onLeave)
}

func onAuthenticated(args ...interface{}) {
	name := args[0].(string)
	uuid := args[1].(string)

	uuidLock.Lock()
	defer uuidLock.Unlock()

	uuids[name] = uuid
}

func onLeave(args ...interface{}) {
	uuidLock.Lock()
	defer uuidLock.Unlock()

	delete(uuids, args[0].(string))
}

func GetUUID(name string) (string, bool) {
	uuidLock.RLock()
	defer uuidLock.RUnlock()

	uuid, exists := uuids[name]

	return uuid, exists
}

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{
	"getUUID":    getUuidFunc,
	"loadPlayer": loadPlayerFunc,
	"isOp":       isOpFunc,
}

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

	uuid, exists := GetUUID(name)

	if exists {
		L.Push(lua.LString(uuid))
	} else {
		L.Push(lua.LNil)
	}

	return 1
}

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

	uuid, exists := GetUUID(name)

	if !exists {
		L.Push(lua.LNil)
		L.Push(lua.LString("User does not exist"))
		return 2
	}

	playerPath := path.Join(WorldPath, "playerdata", uuid+".dat")

	f, err := os.Open(playerPath)

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

	defer f.Close()

	r, err := gzip.NewReader(f)

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

	defer r.Close()

	tag, err := nbt.ReadNamedTag(r)

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

	L.Push(TagToLuaValue(L, tag))
	L.Push(lua.LNil)
	return 2
}