// Copyright © 2016 Abcum Ltd
//
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package keys

// Edge ...
type Edge struct {
	KV string
	NS string
	DB string
	TB string
	ID interface{}
	TK string
	TP string
	FT string
	FK interface{}
}

// init initialises the key
func (k *Edge) init() *Edge {
	switch k.TK {
	case "«»":
	case "‹", "›":
	case "«", "»":
	default:
		k.TK = "«»"
	}
	return k
}

// Copy creates a copy of the key
func (k *Edge) Copy() *Edge {
	return &Edge{
		KV: k.KV,
		NS: k.NS,
		DB: k.DB,
		TB: k.TB,
		ID: k.ID,
		TK: k.TK,
		TP: k.TP,
		FT: k.FT,
		FK: k.FK,
	}
}

// Encode encodes the key into binary
func (k *Edge) Encode() []byte {
	k.init()
	return encode(k.KV, "*", k.NS, "*", k.DB, "*", k.TB, "*", k.ID, k.TK, k.TP, k.FT, k.FK)
}

// Decode decodes the key from binary
func (k *Edge) Decode(data []byte) {
	k.init()
	var __ string
	decode(data, &k.KV, &__, &k.NS, &__, &k.DB, &__, &k.TB, &__, &k.ID, &k.TK, &k.TP, &k.FT, &k.FK)
}

// String returns a string representation of the key
func (k *Edge) String() string {
	k.init()
	return output(k.KV, "*", k.NS, "*", k.DB, "*", k.TB, "*", k.ID, k.TK, k.TP, k.FT, k.FK)
}