package main

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

// 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() {
	rand.Seed(time.Now().UnixNano())
	var f tris.Field
	var floor, topout, harddrop bool
	var x, y int
	var rot tris.Rotation
	var key []byte
	fmt.Print("\033[2J") // Clear screen
	b := tris.NewBag()
	b, p := b.Pick()
	t := time.Tick(time.Second)
	key = GetKey()
	for {
		x, y, rot = p.X, p.Y, p.Rot
		if !harddrop {
			fmt.Print("\033[0;0H") // Position to 0,0
			fmt.Println(f.Add(p).String())
			key = GetKey()
		}
		switch key[0] {
		case 27: // Escape, read the arrow key pressed
			switch key[2] {
			case 65: // Up
				rot = (p.Rot + 1)%4
			case 66: // Down
				y = p.Y + 1
			case 67: // Right
				x = p.X + 1
			case 68: // Left
				x = p.X - 1
			default:
				fmt.Println("...escape, escape!")
				return
			}
		case 'x':
			rot = (p.Rot + 1)%4
		case 'z':
			rot = (p.Rot + 3)%4
		case ' ':
			harddrop = true
		case 'q':
			fmt.Println("...that was exciting!")
			return
		case 'Q':
			fmt.Println("...never let an engineer pick the name of your software?")
			return
		}
		select {
		case <-t:
			y = p.Y + 1
		default:
			if harddrop {
				y = p.Y + 1
			}
		}
		p, floor, topout = p.Move(f, rot, x, y)
		if floor && p.Lock.Add(tris.LockDelay).Before(time.Now()) {
			harddrop = false
			var l int
			f = f.Add(p)
			l, f = f.Lines()
			if l > 0 {
				fmt.Println(l, " lines removed!")
				time.Sleep(time.Second)
			}
			fmt.Print("\033[2J") // Clear screen
			b, p = b.Pick()
		}
		if !floor {
			p.Lock = time.Now()
		}

		if topout {
			fmt.Println("GAME OVER")
			return
		}
	}
}