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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package ethdb

import (
    "fmt"

    "github.com/ethereum/go-ethereum/common"
)

/*
 * This is a test memory database. Do not use for any production it does not get persisted
 */
type MemDatabase struct {
    db map[string][]byte
}

func NewMemDatabase() (*MemDatabase, error) {
    db := &MemDatabase{db: make(map[string][]byte)}

    return db, nil
}

func (db *MemDatabase) Put(key []byte, value []byte) error {
    db.db[string(key)] = value

    return nil
}

func (db *MemDatabase) Set(key []byte, value []byte) {
    db.Put(key, value)
}

func (db *MemDatabase) Get(key []byte) ([]byte, error) {
    return db.db[string(key)], nil
}

/*
func (db *MemDatabase) GetKeys() []*common.Key {
    data, _ := db.Get([]byte("KeyRing"))

    return []*common.Key{common.NewKeyFromBytes(data)}
}
*/

func (db *MemDatabase) Delete(key []byte) error {
    delete(db.db, string(key))

    return nil
}

func (db *MemDatabase) Print() {
    for key, val := range db.db {
        fmt.Printf("%x(%d): ", key, len(key))
        node := common.NewValueFromBytes(val)
        fmt.Printf("%q\n", node.Val)
    }
}

func (db *MemDatabase) Close() {
}

func (db *MemDatabase) LastKnownTD() []byte {
    data, _ := db.Get([]byte("LastKnownTotalDifficulty"))

    if len(data) == 0 || data == nil {
        data = []byte{0x0}
    }

    return data
}

func (db *MemDatabase) Flush() error {
    return nil
}