package tui

import (
	"os"
	"os/signal"
	"golang.org/x/term"
	"unicode"
	"syscall"
	"bufio"
)

type Event interface {}

type TextInput rune
type Paste string
type Resize Dims

var evChan chan Event
func Events() <-chan Event {
	if evChan != nil {
		return evChan
	}
	evChan = make(chan Event, 1)

	go func() {
		rd := bufio.NewReader(os.Stdin)
		for {
			r, _,  err := rd.ReadRune()
			if err != nil {
				evChan <- err
				return
			}
			switch {
			case r == '\033':
				// todo
			case unicode.IsControl(r):
			default:
				evChan <- TextInput(r)
			}
		}
	}()

	sigs := make(chan os.Signal, 1)
	signal.Notify(sigs, syscall.SIGWINCH)
	go func() {
		for _ = range sigs {
			w, h, err := term.GetSize(0)
			if err == nil {
				evChan <- Resize {w, h}
			} else {
				evChan <- err
			}
		}
	}()

	return evChan
}