// Copyright 2016 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 api

import (
	"crypto/ecdsa"
	"fmt"
	"os"
	"path/filepath"
	"time"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/contracts/ens"
	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/node"
	"github.com/ethereum/go-ethereum/p2p/discover"
	"github.com/ethereum/go-ethereum/swarm/log"
	"github.com/ethereum/go-ethereum/swarm/network"
	"github.com/ethereum/go-ethereum/swarm/pss"
	"github.com/ethereum/go-ethereum/swarm/services/swap"
	"github.com/ethereum/go-ethereum/swarm/storage"
)

const (
	DefaultHTTPListenAddr = "127.0.0.1"
	DefaultHTTPPort       = "8500"
)

// separate bzz directories
// allow several bzz nodes running in parallel
type Config struct {
	// serialised/persisted fields
	*storage.FileStoreParams
	*storage.LocalStoreParams
	*network.HiveParams
	Swap *swap.LocalProfile
	Pss  *pss.PssParams
	//*network.SyncParams
	Contract             common.Address
	EnsRoot              common.Address
	EnsAPIs              []string
	Path                 string
	ListenAddr           string
	Port                 string
	PublicKey            string
	BzzKey               string
	NodeID               string
	NetworkID            uint64
	SwapEnabled          bool
	SyncEnabled          bool
	SyncingSkipCheck     bool
	DeliverySkipCheck    bool
	MaxStreamPeerServers int
	LightNodeEnabled     bool
	SyncUpdateDelay      time.Duration
	SwapAPI              string
	Cors                 string
	BzzAccount           string
	privateKey           *ecdsa.PrivateKey
}

//create a default config with all parameters to set to defaults
func NewConfig() (c *Config) {

	c = &Config{
		LocalStoreParams: storage.NewDefaultLocalStoreParams(),
		FileStoreParams:  storage.NewFileStoreParams(),
		HiveParams:       network.NewHiveParams(),
		//SyncParams:    network.NewDefaultSyncParams(),
		Swap:                 swap.NewDefaultSwapParams(),
		Pss:                  pss.NewPssParams(),
		ListenAddr:           DefaultHTTPListenAddr,
		Port:                 DefaultHTTPPort,
		Path:                 node.DefaultDataDir(),
		EnsAPIs:              nil,
		EnsRoot:              ens.TestNetAddress,
		NetworkID:            network.DefaultNetworkID,
		SwapEnabled:          false,
		SyncEnabled:          true,
		SyncingSkipCheck:     false,
		MaxStreamPeerServers: 10000,
		DeliverySkipCheck:    true,
		SyncUpdateDelay:      15 * time.Second,
		SwapAPI:              "",
	}

	return
}

//some config params need to be initialized after the complete
//config building phase is completed (e.g. due to overriding flags)
func (c *Config) Init(prvKey *ecdsa.PrivateKey) {

	address := crypto.PubkeyToAddress(prvKey.PublicKey)
	c.Path = filepath.Join(c.Path, "bzz-"+common.Bytes2Hex(address.Bytes()))
	err := os.MkdirAll(c.Path, os.ModePerm)
	if err != nil {
		log.Error(fmt.Sprintf("Error creating root swarm data directory: %v", err))
		return
	}

	pubkey := crypto.FromECDSAPub(&prvKey.PublicKey)
	pubkeyhex := common.ToHex(pubkey)
	keyhex := crypto.Keccak256Hash(pubkey).Hex()

	c.PublicKey = pubkeyhex
	c.BzzKey = keyhex
	c.NodeID = discover.PubkeyID(&prvKey.PublicKey).String()

	if c.SwapEnabled {
		c.Swap.Init(c.Contract, prvKey)
	}

	c.privateKey = prvKey
	c.LocalStoreParams.Init(c.Path)
	c.LocalStoreParams.BaseKey = common.FromHex(keyhex)

	c.Pss = c.Pss.WithPrivateKey(c.privateKey)
}

func (c *Config) ShiftPrivateKey() (privKey *ecdsa.PrivateKey) {
	if c.privateKey != nil {
		privKey = c.privateKey
		c.privateKey = nil
	}
	return privKey
}