// Copyright 2014 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 miner implements Ethereum block creation and mining.
package miner

import (
    "fmt"
    "time"

	"github.com/ethereum/go-ethereum/core"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/event"
	"github.com/ethereum/go-ethereum/consensus"
	"github.com/ethereum/go-ethereum/params"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/state"
	eminer "github.com/ethereum/go-ethereum/miner"
)

// Backend wraps all methods required for mining.
type Backend interface {
	BlockChain() *core.BlockChain
	TxPool() *core.TxPool
}

// Config is the configuration parameters of mining.
type Config = eminer.Config

type Miner struct {
    w *worker
}

func New(eth Backend, config *Config, chainConfig *params.ChainConfig, mux *event.TypeMux, engine consensus.Engine, isLocalBlock func(block *types.Block) bool) *Miner {
    return &Miner {
        w: newWorker(config, chainConfig, engine, eth, mux, isLocalBlock),
    }
}

func (self *Miner) SetEtherbase(addr common.Address) {
    self.w.setEtherbase(addr)
}

func (self *Miner) Start(coinbase common.Address) {
    self.w.start()
}

func (self *Miner) Stop() {
    self.w.stop()
}

func (self *Miner) SetExtra(extra []byte) error {
	if uint64(len(extra)) > params.MaximumExtraDataSize {
		return fmt.Errorf("Extra exceeds max length. %d > %v", len(extra), params.MaximumExtraDataSize)
	}
	self.w.setExtra(extra)
	return nil
}

func (self *Miner) Mining()  bool {
    return false
}

func (self *Miner) HashRate() uint64 {
    return 0
}

func (self *Miner) SetRecommitInterval(interval time.Duration) {}

func (self *Miner) PendingBlock() *types.Block {
	return self.w.pendingBlock()
}

func (self *Miner) Pending() (*types.Block, *state.StateDB) {
	return self.w.pending()
}