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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library 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 state

import (
    "bytes"

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

// NewStateSync create a new state trie download scheduler.
func NewStateSync(root common.Hash, database trie.DatabaseReader) *trie.TrieSync {
    var syncer *trie.TrieSync
    callback := func(leaf []byte, parent common.Hash) error {
        var obj Account
        if err := rlp.Decode(bytes.NewReader(leaf), &obj); err != nil {
            return err
        }
        syncer.AddSubTrie(obj.Root, 64, parent, nil)
        syncer.AddRawEntry(common.BytesToHash(obj.CodeHash), 64, parent)
        return nil
    }
    syncer = trie.NewTrieSync(root, database, callback)
    return syncer
}