package model

import (
	"testing"
)

func TestEncodeBytes(t *testing.T) {
	want := byte(0b11011000)
	bits := []bool{false, false, false, true, true, false, true, true}
	bs := encodeBytes(bits)
	if bs[0] != want {
		t.Errorf("encodeBytes(%v) = %v, want %v", bits, bs, want)
	}
}

func TestDecodeBools(t *testing.T) {
	want := []bool{false, false, false, true, true, false, true, true}
	bs := []byte{0xD8}
	bits := decodeBools(bs)
	if !sliceEquals(bits, want) {
		t.Errorf("decodeBits(%v) = %v, want %v", bs, bits, want)
	}
}

func TestBytesCopy(t *testing.T) {
	want := []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08}
	dst := []byte{0x01, 0x02, 0x03, 0x01, 0x02, 0x03, 0x07, 0x08}
	src := []byte{0x04, 0x05, 0x06}
	copy(dst[3:], src)
	if !sliceEquals(dst, want) {
		t.Errorf("byteCopy(%v, %v) = %v, want %v", dst, src, dst, want)
	}
}

func sliceEquals[T comparable](a, b []T) bool {
	if len(a) != len(b) {
		return false
	}
	for i, v := range a {
		if v != b[i] {
			return false
		}
	}
	return true
}