package cmd

import (
	"testing"
)

func TestFilter(t *testing.T) {
	filter1 := []uint8{0b10101, 0b11111, 0b00000, 0b00111, 0b00101, 0b00001, 0b10111, 0b10101, 0b01101, 0b10101}
	filter2 := []uint8{0b10101, 0b11111, 0b00000, 0b00111, 0b00101, 0b00001, 0b01000, 0b01010, 0b01000, 0b11011}
	filterR := []uint8{0b10101, 0b11111, 0b00000, 0b00111, 0b00101, 0b00001, 0b00000, 0b00000, 0b01000, 0b10001}

	for i, filterResult := range filterR {
		resultByte := compareBytes(filter1[i], filter2[i])
		if resultByte != filterResult {
			t.Errorf("%b AND %b = %b; got %b\n", filter1[i], filter2[i], filterResult, resultByte)
		}
	}
}

func compareBytes(filter uint8, filterCheck uint8) uint8 {
	filterQuoted := (filterCheck & 1) != 0      // first bit
	filterPin := (filterCheck & 2) != 0         // second bit
	filterReply := (filterCheck & 4) != 0       // third bit
	filterRetweet := (filterCheck & 8) != 0     // fourth bit
	filterSelfThread := (filterCheck & 16) != 0 // fifth bit

	var tweetFilter uint8 = 0
	filterMap := []bool{filterSelfThread, filterRetweet, filterReply, filterPin, filterQuoted}
	for _, f := range filterMap {
		tweetFilter <<= 1
		if f {
			tweetFilter |= 1
		}
	}

	return filter & tweetFilter
}