package main

import (
	"image"
	"log"
	"fmt"
	"time"

	"github.com/mattn/go-tty"
	ui "github.com/gizak/termui"
)

func main() {
	var _ = QueryTerm("\033[14t")


	if err := ui.Init(); err != nil {
		log.Fatalf("failed to initialize termui: %v", err)
	}
	defer ui.Close()

	c := ui.NewCanvas()
	c.SetRect(0, 0, 50, 50)
	c.SetLine(image.Pt(0, 0), image.Pt(10, 20), ui.ColorWhite)

	ui.Render(c)

	for e := range ui.PollEvents() {
		if e.Type == ui.KeyboardEvent {
			break
		}
	}
}

func QueryTerm(qs string) (ret [][]rune) {
  var b []rune

  tty, err := tty.Open()
  if err != nil {return}
  defer tty.Close()

  ch := make(chan bool, 1)
  // defer close(ch)

  go func() {
    // query terminal
    fmt.Printf(qs)

    for {
      r, err := tty.ReadRune()
      if err != nil {return}

      // handle key event
      switch r {
        case 'c', 't': ret = append(ret, b)
                  goto afterLoop
        case '?', ';': ret = append(ret, b)
                  b = []rune{}
        default : b = append(b, r)
      }
    }
    afterLoop:
    ch <- true
    // close(ch)
  }()

  timer := time.NewTimer(50 * time.Millisecond)
  defer timer.Stop()

  select {
    case <-ch:
      defer close(ch)
    case <-timer.C:
  }

  return
}