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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 base32

import (
        "bytes"
        "io"
        "io/ioutil"
        "testing"
)

type testpair struct {
        decoded, encoded string
}

var pairs = []testpair{
        // RFC 4648 examples
        {"", ""},
        {"f", "MY======"},
        {"fo", "MZXQ===="},
        {"foo", "MZXW6==="},
        {"foob", "MZXW6YQ="},
        {"fooba", "MZXW6YTB"},
        {"foobar", "MZXW6YTBOI======"},

        // Wikipedia examples, converted to base32
        {"sure.", "ON2XEZJO"},
        {"sure", "ON2XEZI="},
        {"sur", "ON2XE==="},
        {"su", "ON2Q===="},
        {"leasure.", "NRSWC43VOJSS4==="},
        {"easure.", "MVQXG5LSMUXA===="},
        {"asure.", "MFZXK4TFFY======"},
        {"sure.", "ON2XEZJO"},
}

var bigtest = testpair{
        "Twas brillig, and the slithy toves",
        "KR3WC4ZAMJZGS3DMNFTSYIDBNZSCA5DIMUQHG3DJORUHSIDUN53GK4Y=",
}

func testEqual(t *testing.T, msg string, args ...interface{}) bool {
        if args[len(args)-2] != args[len(args)-1] {
                t.Errorf(msg, args...)
                return false
        }
        return true
}

func TestEncode(t *testing.T) {
        for _, p := range pairs {
                got := StdEncoding.EncodeToString([]byte(p.decoded))
                testEqual(t, "Encode(%q) = %q, want %q", p.decoded, got, p.encoded)
        }
}

func TestEncoder(t *testing.T) {
        for _, p := range pairs {
                bb := &bytes.Buffer{}
                encoder := NewEncoder(StdEncoding, bb)
                encoder.Write([]byte(p.decoded))
                encoder.Close()
                testEqual(t, "Encode(%q) = %q, want %q", p.decoded, bb.String(), p.encoded)
        }
}

func TestEncoderBuffering(t *testing.T) {
        input := []byte(bigtest.decoded)
        for bs := 1; bs <= 12; bs++ {
                bb := &bytes.Buffer{}
                encoder := NewEncoder(StdEncoding, bb)
                for pos := 0; pos < len(input); pos += bs {
                        end := pos + bs
                        if end > len(input) {
                                end = len(input)
                        }
                        n, err := encoder.Write(input[pos:end])
                        testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, error(nil))
                        testEqual(t, "Write(%q) gave length %v, want %v", input[pos:end], n, end-pos)
                }
                err := encoder.Close()
                testEqual(t, "Close gave error %v, want %v", err, error(nil))
                testEqual(t, "Encoding/%d of %q = %q, want %q", bs, bigtest.decoded, bb.String(), bigtest.encoded)
        }
}

func TestDecode(t *testing.T) {
        for _, p := range pairs {
                dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)))
                count, end, err := StdEncoding.decode(dbuf, []byte(p.encoded))
                testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, error(nil))
                testEqual(t, "Decode(%q) = length %v, want %v", p.encoded, count, len(p.decoded))
                if len(p.encoded) > 0 {
                        testEqual(t, "Decode(%q) = end %v, want %v", p.encoded, end, (p.encoded[len(p.encoded)-1] == '='))
                }
                testEqual(t, "Decode(%q) = %q, want %q", p.encoded,
                        string(dbuf[0:count]),
                        p.decoded)

                dbuf, err = StdEncoding.DecodeString(p.encoded)
                testEqual(t, "DecodeString(%q) = error %v, want %v", p.encoded, err, error(nil))
                testEqual(t, "DecodeString(%q) = %q, want %q", p.encoded, string(dbuf), p.decoded)
        }
}

func TestDecoder(t *testing.T) {
        for _, p := range pairs {
                decoder := NewDecoder(StdEncoding, bytes.NewBufferString(p.encoded))
                dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)))
                count, err := decoder.Read(dbuf)
                if err != nil && err != io.EOF {
                        t.Fatal("Read failed", err)
                }
                testEqual(t, "Read from %q = length %v, want %v", p.encoded, count, len(p.decoded))
                testEqual(t, "Decoding of %q = %q, want %q", p.encoded, string(dbuf[0:count]), p.decoded)
                if err != io.EOF {
                        count, err = decoder.Read(dbuf)
                }
                testEqual(t, "Read from %q = %v, want %v", p.encoded, err, io.EOF)
        }
}

func TestDecoderBuffering(t *testing.T) {
        for bs := 1; bs <= 12; bs++ {
                decoder := NewDecoder(StdEncoding, bytes.NewBufferString(bigtest.encoded))
                buf := make([]byte, len(bigtest.decoded)+12)
                var total int
                for total = 0; total < len(bigtest.decoded); {
                        n, err := decoder.Read(buf[total : total+bs])
                        testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", bigtest.encoded, total, n, err, error(nil))
                        total += n
                }
                testEqual(t, "Decoding/%d of %q = %q, want %q", bs, bigtest.encoded, string(buf[0:total]), bigtest.decoded)
        }
}

func TestDecodeCorrupt(t *testing.T) {
        type corrupt struct {
                e string
                p int
        }
        examples := []corrupt{
                {"!!!!", 0},
                {"x===", 0},
                {"AA=A====", 2},
                {"AAA=AAAA", 3},
                {"MMMMMMMMM", 8},
                {"MMMMMM", 0},
        }

        for _, e := range examples {
                dbuf := make([]byte, StdEncoding.DecodedLen(len(e.e)))
                _, err := StdEncoding.Decode(dbuf, []byte(e.e))
                switch err := err.(type) {
                case CorruptInputError:
                        testEqual(t, "Corruption in %q at offset %v, want %v", e.e, int(err), e.p)
                default:
                        t.Error("Decoder failed to detect corruption in", e)
                }
        }
}

func TestBig(t *testing.T) {
        n := 3*1000 + 1
        raw := make([]byte, n)
        const alpha = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
        for i := 0; i < n; i++ {
                raw[i] = alpha[i%len(alpha)]
        }
        encoded := new(bytes.Buffer)
        w := NewEncoder(StdEncoding, encoded)
        nn, err := w.Write(raw)
        if nn != n || err != nil {
                t.Fatalf("Encoder.Write(raw) = %d, %v want %d, nil", nn, err, n)
        }
        err = w.Close()
        if err != nil {
                t.Fatalf("Encoder.Close() = %v want nil", err)
        }
        decoded, err := ioutil.ReadAll(NewDecoder(StdEncoding, encoded))
        if err != nil {
                t.Fatalf("ioutil.ReadAll(NewDecoder(...)): %v", err)
        }

        if !bytes.Equal(raw, decoded) {
                var i int
                for i = 0; i < len(decoded) && i < len(raw); i++ {
                        if decoded[i] != raw[i] {
                                break
                        }
                }
                t.Errorf("Decode(Encode(%d-byte string)) failed at offset %d", n, i)
        }
}

func TestNewLineCharacters(t *testing.T) {
        // Each of these should decode to the string "sure", without errors.
        const expected = "sure"
        examples := []string{
                "ON2XEZI=",
                "ON2XEZI=\r",
                "ON2XEZI=\n",
                "ON2XEZI=\r\n",
                "ON2XEZ\r\nI=",
                "ON2X\rEZ\nI=",
                "ON2X\nEZ\rI=",
                "ON2XEZ\nI=",
                "ON2XEZI\n=",
        }
        for _, e := range examples {
                buf, err := StdEncoding.DecodeString(e)
                if err != nil {
                        t.Errorf("Decode(%q) failed: %v", e, err)
                        continue
                }
                if s := string(buf); s != expected {
                        t.Errorf("Decode(%q) = %q, want %q", e, s, expected)
                }
        }
}