package server

import (
	"net/http"
	"time"

	"github.com/gorilla/mux"
	"github.com/improbable-eng/grpc-web/go/grpcweb"
	"github.com/spf13/cobra"

	sdkserver "github.com/cosmos/cosmos-sdk/server"
	"github.com/cosmos/cosmos-sdk/server/types"
	"github.com/cosmos/cosmos-sdk/version"

	tmlog "github.com/tendermint/tendermint/libs/log"
	rpcclient "github.com/tendermint/tendermint/rpc/jsonrpc/client"
)

// add server commands
func AddCommands(rootCmd *cobra.Command, defaultNodeHome string, appCreator types.AppCreator, appExport types.AppExporter, addStartFlags types.ModuleInitFlags) {
	tendermintCmd := &cobra.Command{
		Use:   "tendermint",
		Short: "Tendermint subcommands",
	}

	tendermintCmd.AddCommand(
		sdkserver.ShowNodeIDCmd(),
		sdkserver.ShowValidatorCmd(),
		sdkserver.ShowAddressCmd(),
		sdkserver.VersionCmd(),
	)

	startCmd := StartCmd(appCreator, defaultNodeHome)
	addStartFlags(startCmd)

	rootCmd.AddCommand(
		startCmd,
		sdkserver.UnsafeResetAllCmd(),
		tendermintCmd,
		sdkserver.ExportCmd(appExport, defaultNodeHome),
		version.NewVersionCommand(),
	)
}

func ConnectTmWS(tmRPCAddr, tmEndpoint string, logger tmlog.Logger) *rpcclient.WSClient {
	tmWsClient, err := rpcclient.NewWSWithOptions(tmRPCAddr, tmEndpoint, rpcclient.WSOptions{
		MaxReconnectAttempts: 256, // first: 2 sec, last: 17 min.
		WriteWait:            120 * time.Second,
		ReadWait:             120 * time.Second,
		PingPeriod:           50 * time.Second,
	})

	tmWsClient.OnReconnect(func() {
		logger.Debug("EVM RPC reconnects to Tendermint WS", "address", tmRPCAddr+tmEndpoint)
	})

	if err != nil {
		logger.Error(
			"Tendermint WS client could not be created",
			"address", tmRPCAddr+tmEndpoint,
			"error", err,
		)
	} else if err := tmWsClient.Start(); err != nil {
		logger.Error(
			"Tendermint WS client could not start",
			"address", tmRPCAddr+tmEndpoint,
			"error", err,
		)
	}

	return tmWsClient
}

func MountGRPCWebServices(
	router *mux.Router,
	grpcWeb *grpcweb.WrappedGrpcServer,
	grpcResources []string,
	logger tmlog.Logger,
) {
	for _, res := range grpcResources {

		logger.Info("[GRPC Web] HTTP POST mounted", "resource", res)

		s := router.Methods("POST").Subrouter()
		s.HandleFunc(res, func(resp http.ResponseWriter, req *http.Request) {
			if grpcWeb.IsGrpcWebSocketRequest(req) {
				grpcWeb.HandleGrpcWebsocketRequest(resp, req)
				return
			}

			if grpcWeb.IsGrpcWebRequest(req) {
				grpcWeb.HandleGrpcWebRequest(resp, req)
				return
			}
		})
	}
}