package cryptext

import (
	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
	"strings"
	"testing"
)

func TestStrSha256SameAsBytesSha256(t *testing.T) {
	inputs := []string{"", "a", "Hello World", "lorem ipsum dolor sit amet", "🎉 unicode"}
	for _, in := range inputs {
		tst.AssertEqual(t, StrSha256(in), BytesSha256([]byte(in)))
	}
}

func TestStrSha256Length(t *testing.T) {
	// SHA-256 hex output must always be 64 characters
	tst.AssertEqual(t, len(StrSha256("")), 64)
	tst.AssertEqual(t, len(StrSha256("x")), 64)
	tst.AssertEqual(t, len(StrSha256(strings.Repeat("x", 10000))), 64)
}

func TestStrSha256Deterministic(t *testing.T) {
	v := "deterministic input"
	a := StrSha256(v)
	b := StrSha256(v)
	tst.AssertEqual(t, a, b)
}

func TestStrSha256DifferentInputs(t *testing.T) {
	tst.AssertNotEqual(t, StrSha256("a"), StrSha256("b"))
	tst.AssertNotEqual(t, StrSha256("Hello"), StrSha256("hello"))
	tst.AssertNotEqual(t, StrSha256("Hello World"), StrSha256("Hello World "))
}

func TestStrSha256IsHex(t *testing.T) {
	out := StrSha256("anything")
	for _, c := range out {
		isLowerHex := (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f')
		if !isLowerHex {
			t.Errorf("non-hex char %q in StrSha256 output", c)
			return
		}
	}
}

func TestBytesSha256NilSameAsEmpty(t *testing.T) {
	tst.AssertEqual(t, BytesSha256(nil), BytesSha256([]byte{}))
}

func TestBytesSha256KnownVectors(t *testing.T) {
	// "abc" => sha-256 standard vector
	tst.AssertEqual(t, StrSha256("abc"), "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad")
}