package main

import (
	"fmt"
	"git.kiefte.eu/lapingvino/clitris/tris"
	"github.com/pkg/term"
	"time"
)

// GetKey() returns the key currently pressed. It always returns a 3 byte slice. Check first element for Escape for handling arrow keys
// Because a defer would trigger too late and the Restore and Close are essential, separated in a function.
func GetKey() []byte {
	t, _ := term.Open("/dev/tty")
	term.RawMode(t)
	key := make([]byte, 3)
	t.SetReadTimeout(time.Second / 1000)
	t.Read(key)
	t.Restore()
	t.Close()
	return key
}

func main() {
	var f tris.Field
	fmt.Print("\033[2J") // Clear screen
	b := tris.NewBag()
	b, p := b.Pick()
	t := time.Tick(time.Second / 60)
	ds := time.NewTicker(time.Second / 10)
	for {
		fmt.Print("\033[2J") // Clear screen
		fmt.Print("\033[0;0H") // Position to 0,0
		fmt.Println(f.Add(p).String())
		select {
		case <-ds.C:
			np, ok := p.Drop(f)
			if ok {
				p = np
				p.Lock = time.Now()
			}
			if time.Now().Sub(p.Lock) > tris.LockDelay {
				f = f.Add(p)
				b, p = b.Pick()
			}
		case <-t:
		}
		key := GetKey()
		switch key[0] {
		case 27: // Escape, read the arrow key pressed
			switch key[2] {
			case 65: // Up
				p.Rot = (p.Rot + 1)%4
			case 66: // Down
			case 67: // Right
				p.X++
			case 68: // Left
				p.X--
			default:
				fmt.Println("...escape, escape!")
				return
			}
		case 'q':
			fmt.Println("...that was exciting!")
			return
		case 'Q':
			fmt.Println("...never let an engineer pick the name of your software?")
			return
		}
	}
}