package main

import (
	"strconv"

	"github.com/fogleman/gg"
)

/*
8x8 square of 100x100 px squares

First 6 characters of the hash are the color
For the next 8 characters each character
represents 4 bits of a row being on or off.
The image is then mirrored to the right side.

9d26bf3cf1fb2b2f02d4a2013333f4fcd551cb2e
9d26bf -> color
      3 -> row1
       c -> row2
         ...
             b -> row8
3 = 0 0 1 1
c = 1 1 0 0
...
b = 1 0 1 1
*/
func FourBitSquares(dc *gg.Context, username string) {
	hash := hash(username)

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

	for i, character := range hash[6:14] {
		integer, _ := strconv.ParseUint(string(character), 16, 4)
		for j := range 4 {
			on := hasBit(integer, j)

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