package modes

import (
	"strconv"

	"github.com/hajimehoshi/ebiten/v2"
	"github.com/hajimehoshi/ebiten/v2/inpututil"
)

func justPressedKeys() []ebiten.Key {
	var keys []ebiten.Key
	keys = inpututil.AppendJustPressedKeys(keys)
	return keys
}

func childKey(key ebiten.Key) bool {
	switch key {
	case ebiten.KeyControl, ebiten.KeyControlLeft, ebiten.KeyControlRight,
		ebiten.KeyShift, ebiten.KeyShiftLeft, ebiten.KeyShiftRight,
		ebiten.KeyAlt, ebiten.KeyAltLeft, ebiten.KeyAltRight,
		ebiten.KeyMeta, ebiten.KeyEscape,
		ebiten.KeyF1, ebiten.KeyF2, ebiten.KeyF3, ebiten.KeyF4,
		ebiten.KeyF5, ebiten.KeyF6, ebiten.KeyF7, ebiten.KeyF8,
		ebiten.KeyF9, ebiten.KeyF10, ebiten.KeyF11, ebiten.KeyF12:
		return false
	default:
		return true
	}
}

func keyLabel(key ebiten.Key) string {
	if r, ok := keyRune(key); ok {
		return string(r)
	}
	switch key {
	case ebiten.KeySpace:
		return "SPACE"
	case ebiten.KeyEnter, ebiten.KeyNumpadEnter:
		return "ENTER"
	case ebiten.KeyBackspace:
		return "BKSP"
	case ebiten.KeyDelete:
		return "DEL"
	case ebiten.KeyTab:
		return "TAB"
	case ebiten.KeyArrowLeft:
		return "LEFT"
	case ebiten.KeyArrowRight:
		return "RIGHT"
	case ebiten.KeyArrowUp:
		return "UP"
	case ebiten.KeyArrowDown:
		return "DOWN"
	default:
		return key.String()
	}
}

func keyRune(key ebiten.Key) (rune, bool) {
	if key >= ebiten.KeyA && key <= ebiten.KeyZ {
		return rune('A' + int(key-ebiten.KeyA)), true
	}
	if key >= ebiten.KeyDigit0 && key <= ebiten.KeyDigit9 {
		return rune('0' + int(key-ebiten.KeyDigit0)), true
	}
	if key >= ebiten.KeyNumpad0 && key <= ebiten.KeyNumpad9 {
		return rune('0' + int(key-ebiten.KeyNumpad0)), true
	}
	return 0, false
}

func digitValue(key ebiten.Key) (string, bool) {
	r, ok := keyRune(key)
	if !ok || r < '0' || r > '9' {
		return "", false
	}
	return string(r), true
}

func parseDigit(s string) int {
	v, _ := strconv.Atoi(s)
	return v
}