// Copyright 2019 The GopherWasm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build go1.12 !wasm

package js

// Callback is for backward compatibility. Use Func instead.
type Callback = Func

// EventCallbackFlag is for backward compatibility.
type EventCallbackFlag int

const (
	PreventDefault EventCallbackFlag = 1 << iota
	StopPropagation
	StopImmediatePropagation
)

// NewCallback is for backward compatibility. Use FuncOf instead.
func NewCallback(fn func([]Value)) Callback {
	return FuncOf(func(this Value, args []Value) interface{} {
		go func() {
			fn(args)
		}()
		return nil
	})
}

// NewEventCallback is for backward compatibility. Use FuncOf instead.
func NewEventCallback(flags EventCallbackFlag, fn func(event Value)) Callback {
	return FuncOf(func(this Value, args []Value) interface{} {
		e := args[0]
		if flags&PreventDefault != 0 {
			e.Call("preventDefault")
		}
		if flags&StopPropagation != 0 {
			e.Call("stopPropagation")
		}
		if flags&StopImmediatePropagation != 0 {
			e.Call("stopImmediatePropagation")
		}
		go func() {
			fn(e)
		}()
		return nil
	})
}