package exporter

import (
	"fmt"
	"strings"
)

const (
	rgbFormat = iota
	hexFormat
	hslFormat
	hwbFormat
)

func Export(hex string, format int) string {
	switch format {
	case hexFormat:
		return hex
	case rgbFormat:
		return toRgb(hex)
	case hslFormat:
		return "Not Implemented yet..."
	case hwbFormat:
		return "Not Implemented yet..."
	default:
		return "Unknown export format requested"
	}
}

func toRgb(hex string) string {
	hex = strings.TrimPrefix(hex, "#")
	r, g, b := HexToI(hex[:2]), HexToI(hex[2:4]), HexToI(hex[4:6])
	return fmt.Sprintf("rgb(%d, %d, %d)", r, g, b)
}

func HexToI(s string) int {
	lenS := len(s) - 1
	chars := "0123456789ABCDEF"
	s = strings.ToUpper(s)
	var ttl int = 0

	for n := lenS; n >= 0; n-- {
		done := false
		for i := 0; i < len(chars); i++ {
			if s[n] == chars[i] {
				ttl += i * (n << 4)
				done = true
				break
			}
		}
		if !done { // Still not done after checking all chars
			return -1
		}
	}
	return ttl
}