package nametransform

import (
	"bytes"
	"strings"
	"testing"
)

func TestPad16(t *testing.T) {
	s := [][]byte{
		[]byte("foo"),
		[]byte("12345678901234567"),
		[]byte("12345678901234567abcdefg"),
	}

	for i := range s {
		orig := s[i]
		padded := pad16(orig)
		if len(padded) <= len(orig) {
			t.Errorf("Padded length not bigger than orig: %d", len(padded))
		}
		if len(padded)%16 != 0 {
			t.Errorf("Length is not aligend: %d", len(padded))
		}
		unpadded, err := unPad16(padded)
		if err != nil {
			t.Error("unPad16 returned error:", err)
		}
		if len(unpadded) != len(orig) {
			t.Errorf("Size mismatch: orig=%d unpadded=%d", len(s[i]), len(unpadded))
		}
		if !bytes.Equal(orig, unpadded) {
			t.Error("Content mismatch orig vs unpadded")
		}
	}
}

// TestUnpad16Garbage - unPad16 should never crash on corrupt or malicious inputs
func TestUnpad16Garbage(t *testing.T) {
	testCases := [][]byte{
		make([]byte, 0),
		make([]byte, 16),
		make([]byte, 1),
		make([]byte, 17),
		bytes.Repeat([]byte{16}, 16),
		bytes.Repeat([]byte{17}, 16),
	}
	for _, v := range testCases {
		_, err := unPad16([]byte(v))
		if err == nil {
			t.Fail()
		}
	}
}

func TestIsValidName(t *testing.T) {
	cases := []struct {
		in   string
		want bool
	}{
		{"", false},
		{".", false},
		{"..", false},
		{"...", true},
		{"asdasd/asdasd", false},
		{"asdasd\000asdasd", false},
		{"hello", true},
		{strings.Repeat("x", 255), true},
		{strings.Repeat("x", 256), false},
	}
	for _, c := range cases {
		have := IsValidName(c.in)
		if (have == nil) != c.want {
			t.Errorf("IsValidName(%q): want %v have %v", c.in, c.want, have)
		}
	}
}

func TestIsValidXattrName(t *testing.T) {
	cases := []struct {
		in   string
		want bool
	}{
		{"", false},
		{".", true},
		{"..", true},
		{"...", true},
		{"asdasd/asdasd", true},
		{"asdasd\000asdasd", false},
		{"hello", true},
		{strings.Repeat("x", 255), true},
		{strings.Repeat("x", 256), true},
	}
	for _, c := range cases {
		have := isValidXattrName(c.in)
		if (have == nil) != c.want {
			t.Errorf("isValidXattrName(%q): want %v have %v", c.in, c.want, have)
		}
	}
}