// Copyright (C) 2020 Storj Labs, Inc.
// See LICENSE for copying information.

package multinode

import (
	"context"
	"io/fs"
	"net"
	"os"
	"path/filepath"

	"github.com/spacemonkeygo/monkit/v3"
	"go.uber.org/zap"
	"golang.org/x/sync/errgroup"

	"storj.io/common/identity"
	"storj.io/common/peertls/tlsopts"
	"storj.io/common/rpc"
	"storj.io/private/debug"
	"storj.io/storj/multinode/bandwidth"
	"storj.io/storj/multinode/console/server"
	"storj.io/storj/multinode/nodes"
	"storj.io/storj/multinode/operators"
	"storj.io/storj/multinode/payouts"
	"storj.io/storj/multinode/reputation"
	"storj.io/storj/multinode/storage"
	"storj.io/storj/private/lifecycle"
	multinodeweb "storj.io/storj/web/multinode"
)

var (
	mon = monkit.Package()
)

// DB is the master database for Multinode Dashboard.
//
// architecture: Master Database
type DB interface {
	// Nodes returns nodes database.
	Nodes() nodes.DB

	// MigrateToLatest initializes the database.
	MigrateToLatest(ctx context.Context) error
	// Close closes the database.
	Close() error
}

// Config is all the configuration parameters for a Multinode Dashboard.
type Config struct {
	// TODO: remove Identity flags since --identity-dir is deprecated
	Identity identity.Config
	Debug    debug.Config

	Console server.Config
}

// Peer is the a Multinode Dashboard application itself.
//
// architecture: Peer
type Peer struct {
	// core dependencies
	Log      *zap.Logger
	Identity *identity.FullIdentity
	DB       DB

	Dialer rpc.Dialer

	// contains logic of nodes domain.
	Nodes struct {
		Service *nodes.Service
	}

	// contains logic of bandwidth domain.
	Bandwidth struct {
		Service *bandwidth.Service
	}

	// exposes operators related logic.
	Operators struct {
		Service *operators.Service
	}

	// contains logic of payouts domain.
	Payouts struct {
		Service *payouts.Service
	}

	Storage struct {
		Service *storage.Service
	}

	Reputation struct {
		Service *reputation.Service
	}

	// Web server with web UI.
	Console struct {
		Listener net.Listener
		Endpoint *server.Server
	}

	Servers *lifecycle.Group
}

// New creates a new instance of Multinode Dashboard application.
func New(log *zap.Logger, full *identity.FullIdentity, config Config, db DB) (_ *Peer, err error) {
	peer := &Peer{
		Log:      log,
		Identity: full,
		DB:       db,
		Servers:  lifecycle.NewGroup(log.Named("servers")),
	}

	tlsConfig := tlsopts.Config{
		UsePeerCAWhitelist: false,
		PeerIDVersions:     "0",
	}

	tlsOptions, err := tlsopts.NewOptions(peer.Identity, tlsConfig, nil)
	if err != nil {
		return nil, err
	}

	peer.Dialer = rpc.NewDefaultDialer(tlsOptions)

	{ // nodes setup
		peer.Nodes.Service = nodes.NewService(
			peer.Log.Named("nodes:service"),
			peer.Dialer,
			peer.DB.Nodes(),
		)
	}

	{ // bandwidth setup
		peer.Bandwidth.Service = bandwidth.NewService(
			peer.Log.Named("bandwidth:service"),
			peer.Dialer,
			peer.Nodes.Service,
		)
	}

	{ // operators setup
		peer.Operators.Service = operators.NewService(
			peer.Log.Named("operators:service"),
			peer.Dialer,
			peer.DB.Nodes(),
		)
	}

	{ // payouts setup
		peer.Payouts.Service = payouts.NewService(
			peer.Log.Named("payouts:service"),
			peer.Dialer,
			peer.DB.Nodes(),
		)
	}

	{ // storage setup
		peer.Storage.Service = storage.NewService(
			peer.Log.Named("storage:service"),
			peer.Dialer,
			peer.DB.Nodes(),
		)
	}

	{ // reputation setup
		peer.Reputation.Service = reputation.NewService(
			peer.Log.Named("reputation:service"),
			peer.Dialer,
			peer.DB.Nodes(),
		)
	}

	{ // console setup
		peer.Console.Listener, err = net.Listen("tcp", config.Console.Address)
		if err != nil {
			return nil, err
		}

		var assets fs.FS
		assets = multinodeweb.Assets
		// Use a custom directory instead of the embedded assets.
		if config.Console.StaticDir != "" {
			// HACKFIX: Previous setups specify the directory for web/multinode,
			// instead of the actual built data. This is for backwards compatibility.
			distDir := filepath.Join(config.Console.StaticDir, "dist")
			assets = os.DirFS(distDir)
		}

		peer.Console.Endpoint, err = server.NewServer(
			peer.Log.Named("console:endpoint"),
			peer.Console.Listener,
			assets,
			server.Services{
				Nodes:      peer.Nodes.Service,
				Payouts:    peer.Payouts.Service,
				Operators:  peer.Operators.Service,
				Storage:    peer.Storage.Service,
				Bandwidth:  peer.Bandwidth.Service,
				Reputation: peer.Reputation.Service,
			},
		)
		if err != nil {
			return nil, err
		}

		peer.Servers.Add(lifecycle.Item{
			Name:  "console:endpoint",
			Run:   peer.Console.Endpoint.Run,
			Close: peer.Console.Endpoint.Close,
		})
	}

	return peer, nil
}

// Run runs Multinode Dashboard services and servers until it's either closed or it errors.
func (peer *Peer) Run(ctx context.Context) (err error) {
	defer mon.Task()(&ctx)(&err)

	group, ctx := errgroup.WithContext(ctx)

	peer.Servers.Run(ctx, group)

	return group.Wait()
}

// Close closes all the resources.
func (peer *Peer) Close() error {
	return peer.Servers.Close()
}