// Copyright 2015 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.

package codec

import (
	"github.com/hanchuanchuan/goInception/util/testleak"
	. "github.com/pingcap/check"
)

var _ = Suite(&testBytesSuite{})

type testBytesSuite struct {
}

func (s *testBytesSuite) TestBytesCodec(c *C) {
	defer testleak.AfterTest(c)()
	inputs := []struct {
		enc  []byte
		dec  []byte
		desc bool
	}{
		{[]byte{}, []byte{0, 0, 0, 0, 0, 0, 0, 0, 247}, false},
		{[]byte{}, []byte{255, 255, 255, 255, 255, 255, 255, 255, 8}, true},
		{[]byte{0}, []byte{0, 0, 0, 0, 0, 0, 0, 0, 248}, false},
		{[]byte{0}, []byte{255, 255, 255, 255, 255, 255, 255, 255, 7}, true},
		{[]byte{1, 2, 3}, []byte{1, 2, 3, 0, 0, 0, 0, 0, 250}, false},
		{[]byte{1, 2, 3}, []byte{254, 253, 252, 255, 255, 255, 255, 255, 5}, true},
		{[]byte{1, 2, 3, 0}, []byte{1, 2, 3, 0, 0, 0, 0, 0, 251}, false},
		{[]byte{1, 2, 3, 0}, []byte{254, 253, 252, 255, 255, 255, 255, 255, 4}, true},
		{[]byte{1, 2, 3, 4, 5, 6, 7}, []byte{1, 2, 3, 4, 5, 6, 7, 0, 254}, false},
		{[]byte{1, 2, 3, 4, 5, 6, 7}, []byte{254, 253, 252, 251, 250, 249, 248, 255, 1}, true},
		{[]byte{0, 0, 0, 0, 0, 0, 0, 0}, []byte{0, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 247}, false},
		{[]byte{0, 0, 0, 0, 0, 0, 0, 0}, []byte{255, 255, 255, 255, 255, 255, 255, 255, 0, 255, 255, 255, 255, 255, 255, 255, 255, 8}, true},
		{[]byte{1, 2, 3, 4, 5, 6, 7, 8}, []byte{1, 2, 3, 4, 5, 6, 7, 8, 255, 0, 0, 0, 0, 0, 0, 0, 0, 247}, false},
		{[]byte{1, 2, 3, 4, 5, 6, 7, 8}, []byte{254, 253, 252, 251, 250, 249, 248, 247, 0, 255, 255, 255, 255, 255, 255, 255, 255, 8}, true},
		{[]byte{1, 2, 3, 4, 5, 6, 7, 8, 9}, []byte{1, 2, 3, 4, 5, 6, 7, 8, 255, 9, 0, 0, 0, 0, 0, 0, 0, 248}, false},
		{[]byte{1, 2, 3, 4, 5, 6, 7, 8, 9}, []byte{254, 253, 252, 251, 250, 249, 248, 247, 0, 246, 255, 255, 255, 255, 255, 255, 255, 7}, true},
	}

	for _, input := range inputs {
		if input.desc {
			b := EncodeBytesDesc(nil, input.enc)
			c.Assert(b, BytesEquals, input.dec)
			_, d, err := DecodeBytesDesc(b, nil)
			c.Assert(err, IsNil)
			c.Assert(d, BytesEquals, input.enc)
		} else {
			b := EncodeBytes(nil, input.enc)
			c.Assert(b, BytesEquals, input.dec)
			_, d, err := DecodeBytes(b, nil)
			c.Assert(err, IsNil)
			c.Assert(d, BytesEquals, input.enc)
		}
	}

	// Test error decode.
	errInputs := [][]byte{
		{1, 2, 3, 4},
		{0, 0, 0, 0, 0, 0, 0, 247},
		{0, 0, 0, 0, 0, 0, 0, 0, 246},
		{0, 0, 0, 0, 0, 0, 0, 1, 247},
		{1, 2, 3, 4, 5, 6, 7, 8, 0},
		{1, 2, 3, 4, 5, 6, 7, 8, 255, 1},
		{1, 2, 3, 4, 5, 6, 7, 8, 255, 1, 2, 3, 4, 5, 6, 7, 8},
		{1, 2, 3, 4, 5, 6, 7, 8, 255, 1, 2, 3, 4, 5, 6, 7, 8, 255},
		{1, 2, 3, 4, 5, 6, 7, 8, 255, 1, 2, 3, 4, 5, 6, 7, 8, 0},
	}

	for _, input := range errInputs {
		_, _, err := DecodeBytes(input, nil)
		c.Assert(err, NotNil)
	}
}