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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package hex

import (
        "bytes"
        "testing"
)

type encDecTest struct {
        enc string
        dec []byte
}

var encDecTests = []encDecTest{
        {"", []byte{}},
        {"0001020304050607", []byte{0, 1, 2, 3, 4, 5, 6, 7}},
        {"08090a0b0c0d0e0f", []byte{8, 9, 10, 11, 12, 13, 14, 15}},
        {"f0f1f2f3f4f5f6f7", []byte{0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7}},
        {"f8f9fafbfcfdfeff", []byte{0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}},
        {"67", []byte{'g'}},
        {"e3a1", []byte{0xe3, 0xa1}},
}

func TestEncode(t *testing.T) {
        for i, test := range encDecTests {
                dst := make([]byte, EncodedLen(len(test.dec)))
                n := Encode(dst, test.dec)
                if n != len(dst) {
                        t.Errorf("#%d: bad return value: got: %d want: %d", i, n, len(dst))
                }
                if string(dst) != test.enc {
                        t.Errorf("#%d: got: %#v want: %#v", i, dst, test.enc)
                }
        }
}

func TestDecode(t *testing.T) {
        for i, test := range encDecTests {
                dst := make([]byte, DecodedLen(len(test.enc)))
                n, err := Decode(dst, []byte(test.enc))
                if err != nil {
                        t.Errorf("#%d: bad return value: got:%d want:%d", i, n, len(dst))
                } else if !bytes.Equal(dst, test.dec) {
                        t.Errorf("#%d: got: %#v want: %#v", i, dst, test.dec)
                }
        }
}

func TestEncodeToString(t *testing.T) {
        for i, test := range encDecTests {
                s := EncodeToString(test.dec)
                if s != test.enc {
                        t.Errorf("#%d got:%s want:%s", i, s, test.enc)
                }
        }
}

func TestDecodeString(t *testing.T) {
        for i, test := range encDecTests {
                dst, err := DecodeString(test.enc)
                if err != nil {
                        t.Errorf("#%d: unexpected err value: %s", i, err)
                        continue
                }
                if bytes.Compare(dst, test.dec) != 0 {
                        t.Errorf("#%d: got: %#v want: #%v", i, dst, test.dec)
                }
        }
}

type errTest struct {
        in  string
        err string
}

var errTests = []errTest{
        {"0", "encoding/hex: odd length hex string"},
        {"0g", "encoding/hex: invalid byte: U+0067 'g'"},
        {"0\x01", "encoding/hex: invalid byte: U+0001"},
}

func TestInvalidErr(t *testing.T) {
        for i, test := range errTests {
                dst := make([]byte, DecodedLen(len(test.in)))
                _, err := Decode(dst, []byte(test.in))
                if err == nil {
                        t.Errorf("#%d: expected error; got none")
                } else if err.Error() != test.err {
                        t.Errorf("#%d: got: %v want: %v", i, err, test.err)
                }
        }
}

func TestInvalidStringErr(t *testing.T) {
        for i, test := range errTests {
                _, err := DecodeString(test.in)
                if err == nil {
                        t.Errorf("#%d: expected error; got none")
                } else if err.Error() != test.err {
                        t.Errorf("#%d: got: %v want: %v", i, err, test.err)
                }
        }
}

func TestDumper(t *testing.T) {
        var in [40]byte
        for i := range in {
                in[i] = byte(i + 30)
        }

        for stride := 1; stride < len(in); stride++ {
                var out bytes.Buffer
                dumper := Dumper(&out)
                done := 0
                for done < len(in) {
                        todo := done + stride
                        if todo > len(in) {
                                todo = len(in)
                        }
                        dumper.Write(in[done:todo])
                        done = todo
                }

                dumper.Close()
                if !bytes.Equal(out.Bytes(), expectedHexDump) {
                        t.Errorf("stride: %d failed. got:\n%s\nwant:\n%s", stride, out.Bytes(), expectedHexDump)
                }
        }
}

func TestDump(t *testing.T) {
        var in [40]byte
        for i := range in {
                in[i] = byte(i + 30)
        }

        out := []byte(Dump(in[:]))
        if !bytes.Equal(out, expectedHexDump) {
                t.Errorf("got:\n%s\nwant:\n%s", out, expectedHexDump)
        }
}

var expectedHexDump = []byte(`00000000  1e 1f 20 21 22 23 24 25  26 27 28 29 2a 2b 2c 2d  |.. !"#$%&'()*+,-|
00000010  2e 2f 30 31 32 33 34 35  36 37 38 39 3a 3b 3c 3d  |./0123456789:;<=|
00000020  3e 3f 40 41 42 43 44 45                           |>?@ABCDE|
`)