package cryptopals_test

import (
	"testing"

	"mvvasilev.dev/cryptopals/set1"
)

const Challenge1HexValue = "49276d206b696c6c696e6720796f757220627261696e206c696b65206120706f69736f6e6f7573206d757368726f6f6d"

func Test_Challenge1(t *testing.T) {
	const expected = "SSdtIGtpbGxpbmcgeW91ciBicmFpbiBsaWtlIGEgcG9pc29ub3VzIG11c2hyb29t"

	value, success := set1.HexToBase64(Challenge1HexValue)

	if !success || value != expected {
		t.Fatal("Set 1, Challenge 1 has failed")
	}
}

func Test_Challenge2(t *testing.T) {
	const expected = "746865206b696420646f6e277420706c6179"

	const content = "1c0111001f010100061a024b53535009181c"
	const password = "686974207468652062756c6c277320657965"

	value := set1.XORHexString(content, password)

	if value != expected {
		t.Fatal(("Set 1, Challenge 2 has failed"))
	}
}

func Test_Challenge3(t *testing.T) {
	const encodedString = "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736"

	const letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"

	var passChar, mostCommonByte byte
	var text string

	for i := 0; i < len(letters); i++ {
		letter := letters[i]
		result := set1.XORDecode(encodedString, letter)
		mostCommonLetter := set1.FindMostCommonByteInText(result)

		if mostCommonLetter > mostCommonByte {
			mostCommonByte = mostCommonLetter
			text = result
			passChar = letter
		}
	}

	t.Logf("Result:\n\tEncoding char: %c\n\tMost common letter: %c\n\tText: %v", passChar, mostCommonByte, text)
}