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// Copyright 2018 The dexon-consensus-core Authors
// This file is part of the dexon-consensus-core library.
//
// The dexon-consensus-core 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 dexon-consensus-core 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 dexon-consensus-core library. If not, see
// <http://www.gnu.org/licenses/>.

package dex

import (
    "math/big"
    "sync"

    dexCore "github.com/dexon-foundation/dexon-consensus-core/core"
    "github.com/dexon-foundation/dexon-consensus-core/core/blockdb"
    ethCrypto "github.com/dexon-foundation/dexon-consensus-core/crypto/eth"

    "github.com/dexon-foundation/dexon/internal/ethapi"
    "github.com/ethereum/go-ethereum/accounts"
    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/consensus"
    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/core/bloombits"
    "github.com/ethereum/go-ethereum/eth"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/event"
    "github.com/ethereum/go-ethereum/node"
    "github.com/ethereum/go-ethereum/p2p"
    "github.com/ethereum/go-ethereum/params"
    "github.com/ethereum/go-ethereum/rpc"
)

// Dexon implementes the DEXON fullnode service.
type Dexon struct {
    config      *eth.Config
    chainConfig *params.ChainConfig

    // Channel for shutting down the service
    shutdownChan chan bool // Channel for shutting down the Ethereum
    txPool       *core.TxPool
    blockchain   *core.BlockChain

    // DB interfaces
    chainDb ethdb.Database // Block chain database

    eventMux       *event.TypeMux
    engine         consensus.Engine
    accountManager *accounts.Manager

    bloomRequests chan chan *bloombits.Retrieval // Channel receiving bloom data retrieval requests
    bloomIndexer  *core.ChainIndexer             // Bloom indexer operating during block imports

    gasPrice  *big.Int
    etherbase common.Address

    // Dexon consensus.
    app        *DexconApp
    governance *DexconGovernance
    network    *DexconNetwork
    blockdb    blockdb.BlockDatabase
    consensus  *dexCore.Consensus

    networkID     uint64
    netRPCService *ethapi.PublicNetAPI

    lock sync.RWMutex // Protects the variadic fields (e.g. gas price and etherbase)
}

func New(ctx *node.ServiceContext, config *eth.Config) (*Dexon, error) {
    // Consensus.
    db, err := blockdb.NewLevelDBBackedBlockDB("main.blockdb")
    if err != nil {
        panic(err)
    }
    app := NewDexconApp(nil)
    gov := NewDexconGovernance()
    network := NewDexconNetwork()

    // TODO(w): replace this with node key.
    privKey, err := ethCrypto.NewPrivateKey()
    if err != nil {
        panic(err)
    }
    consensus := dexCore.NewConsensus(
        app, gov, db, network, privKey, ethCrypto.SigToPub)

    dex := &Dexon{
        config:         config,
        eventMux:       ctx.EventMux,
        accountManager: ctx.AccountManager,
        shutdownChan:   make(chan bool),
        networkID:      config.NetworkId,
        gasPrice:       config.MinerGasPrice,
        etherbase:      config.Etherbase,
        bloomRequests:  make(chan chan *bloombits.Retrieval),
        app:            app,
        governance:     gov,
        network:        network,
        blockdb:        db,
        consensus:      consensus,
    }
    return dex, nil
}

func (s *Dexon) Protocols() []p2p.Protocol {
    return nil
}

func (s *Dexon) APIs() []rpc.API {
    return nil
}

func (s *Dexon) Start(server *p2p.Server) error {
    return nil
}

func (s *Dexon) Stop() error {
    return nil
}