package main

import (
	"crypto/sha1"
	"fmt"
	"strconv"

	"github.com/fogleman/gg"
)

// 8x8 square of 100x100 px squares
func main() {
	dc := gg.NewContext(800, 800)

	hash := hash("InsightForgeOrg")

	colorString := hash[0:6]
	r, g, b := rgbFromHex(colorString)
	dc.SetRGB255(r, g, b)

	for i, character := range hash[6:14] {
		tmp, _ := strconv.ParseUint(string(character), 16, 8)
		n := int(tmp)
		for _, v := range []uint{0, 1, 2, 3} {
			on := hasBit(n, v)

			dc.DrawRectangle(float64(v * 100), float64(i * 100), 100, 100)
			dc.DrawRectangle(700 - float64(v * 100), float64(i * 100), 100, 100)
			if !on {
				dc.SetRGB255(r, g, b)
			} else {
				dc.SetRGB255(255, 255, 255)
			}
			dc.Fill()
		}
	}

	dc.SavePNG("out.png")
}

func rgbFromHex(hex string) (int, int, int) {
	r, _ := strconv.ParseUint(hex[0:2], 16, 8)
	g, _ := strconv.ParseUint(hex[2:4], 16, 8)
	b, _ := strconv.ParseUint(hex[4:6], 16, 8)
	return int(r), int(g), int(b)
}

func hash(str string) string {
	h := sha1.New()
	h.Write([]byte(str))
	res := h.Sum(nil)
	return fmt.Sprintf("%x", res)
}

func hasBit(n int, pos uint) bool {
    val := n & (1 << pos)
    return (val > 0)
}

// 9d26bf3cf1fb2b2f02d4a2013333f4fcd551cb2e
// 9d26bf -> color
//       3 -> row1
//        c -> row2
//          ...
//              b -> row8

// 3 = 0 0 1 1
//