// (c) 2019-2020, Lux Partners Limited.
//
// This file is a derived work, based on the go-ethereum library whose original
// notices appear below.
//
// It is distributed under a license compatible with the licensing terms of the
// original code from which it is derived.
//
// Much love to the original authors for their work.
// **********
// 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 (
	"github.com/luxfi/node/utils/timer/mockable"
	"github.com/luxfi/coreth/consensus"
	"github.com/luxfi/coreth/core"
	"github.com/luxfi/coreth/core/txpool"
	"github.com/luxfi/coreth/core/types"
	"github.com/luxfi/coreth/params"
	"github.com/luxfi/coreth/precompile/precompileconfig"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/event"
)

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

// Config is the configuration parameters of mining.
type Config struct {
	Etherbase common.Address `toml:",omitempty"` // Public address for block mining rewards
}

type Miner struct {
	worker *worker
}

func New(eth Backend, config *Config, chainConfig *params.ChainConfig, mux *event.TypeMux, engine consensus.Engine, clock *mockable.Clock) *Miner {
	return &Miner{
		worker: newWorker(config, chainConfig, engine, eth, mux, clock),
	}
}

func (miner *Miner) SetEtherbase(addr common.Address) {
	miner.worker.setEtherbase(addr)
}

func (miner *Miner) GenerateBlock(predicateContext *precompileconfig.PredicateContext) (*types.Block, error) {
	return miner.worker.commitNewWork(predicateContext)
}

// SubscribePendingLogs starts delivering logs from pending transactions
// to the given channel.
func (miner *Miner) SubscribePendingLogs(ch chan<- []*types.Log) event.Subscription {
	return miner.worker.pendingLogsFeed.Subscribe(ch)
}
