package input

import (
	"errors"
	"strings"
)

var ErrBadKey = errors.New("unknown key")

// vkNames maps API key names to Windows virtual-key codes.
var vkNames = map[string]uint16{
	"backspace": 0x08,
	"tab":       0x09,
	"enter":     0x0D,
	"shift":     0xA0,
	"ctrl":      0xA2,
	"control":   0xA2,
	"alt":       0xA4,
	"pause":     0x13,
	"capslock":  0x14,
	"escape":    0x1B,
	"esc":       0x1B,
	"space":     0x20,
	"pageup":    0x21,
	"pagedown":  0x22,
	"end":       0x23,
	"home":      0x24,
	"left":      0x25,
	"up":        0x26,
	"right":     0x27,
	"down":      0x28,
	"insert":    0x2D,
	"delete":    0x2E,
	"del":       0x2E,
	"win":       0x5B,
	"lwin":      0x5B,
	"rwin":      0x5C,
	"0":         0x30,
	"1":         0x31,
	"2":         0x32,
	"3":         0x33,
	"4":         0x34,
	"5":         0x35,
	"6":         0x36,
	"7":         0x37,
	"8":         0x38,
	"9":         0x39,
	"a":         0x41,
	"b":         0x42,
	"c":         0x43,
	"d":         0x44,
	"e":         0x45,
	"f":         0x46,
	"g":         0x47,
	"h":         0x48,
	"i":         0x49,
	"j":         0x4A,
	"k":         0x4B,
	"l":         0x4C,
	"m":         0x4D,
	"n":         0x4E,
	"o":         0x4F,
	"p":         0x50,
	"q":         0x51,
	"r":         0x52,
	"s":         0x53,
	"t":         0x54,
	"u":         0x55,
	"v":         0x56,
	"w":         0x57,
	"x":         0x58,
	"y":         0x59,
	"z":         0x5A,
	"f1":        0x70,
	"f2":        0x71,
	"f3":        0x72,
	"f4":        0x73,
	"f5":        0x74,
	"f6":        0x75,
	"f7":        0x76,
	"f8":        0x77,
	"f9":        0x78,
	"f10":       0x79,
	"f11":       0x7A,
	"f12":       0x7B,
	";":         0xBA,
	"=":         0xBB,
	",":         0xBC,
	"-":         0xBD,
	".":         0xBE,
	"/":         0xBF,
	"`":         0xC0,
	"[":         0xDB,
	"\\":        0xDC,
	"]":         0xDD,
	"'":         0xDE,
}

func vkCode(name string) (uint16, bool) {
	key := strings.ToLower(strings.TrimSpace(name))
	if len(key) == 1 {
		if vk, ok := vkNames[key]; ok {
			return vk, true
		}
	}
	vk, ok := vkNames[key]
	return vk, ok
}