package core

import (
	"fmt"
	"os"
	"path/filepath"

	"mongo.games.com/goserver/core/basic"
	"mongo.games.com/goserver/core/utils"
)

const (
	HOOK_BEFORE_START int = iota
	HOOK_AFTER_STOP
	HOOK_MAX
)

var (
	AppCtx *Ctx = newCtx()
	hooks  [HOOK_MAX][]hookfunc
)

type hookfunc func() error

type Ctx struct {
	*basic.Object
	CoreObj *basic.Object
}

func newCtx() *Ctx {
	ctx := &Ctx{}
	ctx.init()
	return ctx
}

func (ctx *Ctx) init() {
	ctx.Object = basic.NewObject(ObjId_RootId,
		"root",
		basic.Options{
			MaxDone:      1024,
			QueueBacklog: 1024,
		},
		nil)
	ctx.Object.Waitor = utils.NewWaitor("core.Ctx")
	ctx.UserData = ctx
	ctx.Active()
}

func LaunchChild(o *basic.Object) {
	AppCtx.LaunchChild(o)
}

func Terminate(o *basic.Object) {
	AppCtx.Terminate(o)
}

func CoreObject() *basic.Object {
	//return AppCtx.GetChildById(ObjId_CoreId)
	return AppCtx.CoreObj
}

func RegisteHook(hookpos int, f hookfunc) {
	if hookpos < 0 || hookpos > HOOK_MAX {
		return
	}
	hooks[hookpos] = append(hooks[hookpos], f)
}

func ExecuteHook(hookpos int) error {
	if hookpos < 0 || hookpos > HOOK_MAX {
		return nil
	}
	var err error
	for _, h := range hooks[hookpos] {
		err = h()
		if err != nil {
			return err
		}
	}
	return nil
}

func WritePid() {
	if len(os.Args) > 0 {
		baseName := filepath.Base(os.Args[0])
		f, err := os.OpenFile(baseName+".pid", os.O_CREATE|os.O_TRUNC|os.O_RDWR, os.ModePerm)
		if err != nil {
			panic(fmt.Sprintf("%s had running", os.Args[0]))
			return
		}

		f.WriteString(fmt.Sprintf("%v", os.Getpid()))
	}
}