// Copyright © 2020 Vulcanize, Inc
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"os"
	"os/signal"
	"sync"

	"github.com/ethereum/go-ethereum/rpc"
	log "github.com/sirupsen/logrus"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"

	"github.com/vulcanize/ipld-eth-indexer/pkg/eth"

	s "github.com/vulcanize/ipld-eth-server/pkg/serve"
	v "github.com/vulcanize/ipld-eth-server/version"
)

// serveCmd represents the serve command
var serveCmd = &cobra.Command{
	Use:   "serve",
	Short: "serve chain data from PG-IPFS",
	Long: `This command configures a VulcanizeDB ipld-eth-server.

`,
	Run: func(cmd *cobra.Command, args []string) {
		subCommand = cmd.CalledAs()
		logWithCommand = *log.WithField("SubCommand", subCommand)
		serve()
	},
}

func serve() {
	logWithCommand.Infof("running ipld-eth-server version: %s", v.VersionWithMeta)

	var forwardPayloadChan chan eth.ConvertedPayload
	wg := new(sync.WaitGroup)
	logWithCommand.Debug("loading server configuration variables")
	serverConfig, err := s.NewConfig()
	if err != nil {
		logWithCommand.Fatal(err)
	}
	logWithCommand.Infof("server config: %+v", serverConfig)
	logWithCommand.Debug("initializing new server service")
	server, err := s.NewServer(serverConfig)
	if err != nil {
		logWithCommand.Fatal(err)
	}

	logWithCommand.Info("starting up server servers")
	forwardPayloadChan = make(chan eth.ConvertedPayload, s.PayloadChanBufferSize)
	server.Serve(wg, forwardPayloadChan)
	if err := startServers(server, serverConfig); err != nil {
		logWithCommand.Fatal(err)
	}

	shutdown := make(chan os.Signal)
	signal.Notify(shutdown, os.Interrupt)
	<-shutdown
	server.Stop()
	wg.Wait()
}

func startServers(server s.Server, settings *s.Config) error {
	logWithCommand.Info("starting up IPC server")
	_, _, err := rpc.StartIPCEndpoint(settings.IPCEndpoint, server.APIs())
	if err != nil {
		return err
	}
	logWithCommand.Info("starting up WS server")
	_, _, err = rpc.StartWSEndpoint(settings.WSEndpoint, server.APIs(), []string{"vdb"}, nil, true)
	if err != nil {
		return err
	}
	logWithCommand.Info("starting up HTTP server")
	_, _, err = rpc.StartHTTPEndpoint(settings.HTTPEndpoint, server.APIs(), []string{"eth"}, nil, []string{"*"}, rpc.HTTPTimeouts{})
	return err
}

func init() {
	rootCmd.AddCommand(serveCmd)

	// flags for all config variables
	serveCmd.PersistentFlags().String("server-ws-path", "", "vdb server ws path")
	serveCmd.PersistentFlags().String("server-http-path", "", "vdb server http path")
	serveCmd.PersistentFlags().String("server-ipc-path", "", "vdb server ipc path")

	serveCmd.PersistentFlags().String("eth-chain-id", "1", "eth chain id")
	serveCmd.PersistentFlags().String("eth-default-sender", "", "default sender address")
	serveCmd.PersistentFlags().String("eth-rpc-gas-cap", "", "rpc gas cap (for eth_Call execution)")

	// and their bindings
	viper.BindPFlag("server.wsPath", serveCmd.PersistentFlags().Lookup("server-ws-path"))
	viper.BindPFlag("server.httpPath", serveCmd.PersistentFlags().Lookup("server-http-path"))
	viper.BindPFlag("server.ipcPath", serveCmd.PersistentFlags().Lookup("server-ipc-path"))

	viper.BindPFlag("ethereum.chainID", rootCmd.PersistentFlags().Lookup("eth-chain-id"))
	viper.BindPFlag("ethereum.defaultSender", rootCmd.PersistentFlags().Lookup("eth-default-sender"))
	viper.BindPFlag("ethereum.rpcGasCap", rootCmd.PersistentFlags().Lookup("eth-rpc-gas-cap"))
}