// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.

package main

import (
	"context"
	"fmt"
	"io"
	"os"
	"os/exec"
	"runtime"
	"strings"
	"text/tabwriter"

	"github.com/fatih/color"
	"github.com/golang/protobuf/ptypes"
	"github.com/spf13/cobra"
	"go.uber.org/zap"

	"storj.io/storj/internal/memory"
	"storj.io/storj/pkg/identity"
	"storj.io/storj/pkg/pb"
	"storj.io/storj/pkg/piecestore/psclient"
	"storj.io/storj/pkg/transport"
)

func dashCmd(cmd *cobra.Command, args []string) (err error) {
	ctx := context.Background()

	ident, err := runCfg.Identity.Load()
	if err != nil {
		zap.S().Fatal(err)
	} else {
		zap.S().Info("Node ID: ", ident.ID)
	}

	tc := transport.NewClient(ident)
	n := &pb.Node{
		Address: &pb.NodeAddress{
			Address:   dashboardCfg.Address,
			Transport: 0,
		},
		Type: pb.NodeType_STORAGE,
	}

	lc, err := psclient.NewLiteClient(ctx, tc, n)
	if err != nil {
		return err
	}

	stream, err := lc.Dashboard(ctx)
	if err != nil {
		return err
	}

	online, err := getConnectionStatus(ctx, tc, ident)
	if err != nil {
		zap.S().Error("error getting connection status %s", err.Error())
	}

	for {
		data, err := stream.Recv()
		if err == io.EOF {
			break
		}

		if err != nil {
			return err
		}

		clearScreen()
		heading := color.New(color.FgGreen, color.Bold)

		_, _ = heading.Printf("\nStorage Node Dashboard\n")
		_, _ = heading.Printf("\n======================\n\n")

		w := tabwriter.NewWriter(color.Output, 0, 0, 1, ' ', 0)
		fmt.Fprintf(w, "ID\t%s\n", color.YellowString(data.GetNodeId()))

		if online {
			fmt.Fprintf(w, "Status\t%s\n", color.GreenString("ONLINE"))
		} else {
			fmt.Fprintf(w, "Status\t%s\n", color.RedString("OFFLINE"))
		}

		uptime, err := ptypes.Duration(data.GetUptime())
		if err != nil {
			fmt.Fprintf(w, "Uptime\t%s\n", color.RedString(uptime.String()))
		} else {
			fmt.Fprintf(w, "Uptime\t%s\n", color.YellowString(uptime.String()))
		}

		if err = w.Flush(); err != nil {
			return err
		}

		stats := data.GetStats()
		if stats != nil {
			availableBandwidth := color.WhiteString(memory.Size(stats.GetAvailableBandwidth()).Base10String())
			usedBandwidth := color.WhiteString(memory.Size(stats.GetUsedBandwidth()).Base10String())
			availableSpace := color.WhiteString(memory.Size(stats.GetAvailableSpace()).Base10String())
			usedSpace := color.WhiteString(memory.Size(stats.GetUsedSpace()).Base10String())

			w = tabwriter.NewWriter(color.Output, 0, 0, 5, ' ', tabwriter.AlignRight)
			fmt.Fprintf(w, "\n\t%s\t%s\t\n", color.GreenString("Available"), color.GreenString("Used"))
			fmt.Fprintf(w, "Bandwidth\t%s\t%s\t\n", availableBandwidth, usedBandwidth)
			fmt.Fprintf(w, "Disk\t%s\t%s\t\n", availableSpace, usedSpace)
			if err = w.Flush(); err != nil {
				return err
			}

		} else {
			color.Yellow("Loading...\n")
		}

		w = tabwriter.NewWriter(color.Output, 0, 0, 1, ' ', 0)
		// TODO: Get addresses from server data
		fmt.Fprintf(w, "\nBootstrap\t%s\n", color.WhiteString(data.GetBootstrapAddress()))
		fmt.Fprintf(w, "Internal\t%s\n", color.WhiteString(dashboardCfg.Address))
		fmt.Fprintf(w, "External\t%s\n", color.WhiteString(data.GetExternalAddress()))
		fmt.Fprintf(w, "\nNeighborhood Size %+v\n", whiteInt(data.GetNodeConnections()))
		if err = w.Flush(); err != nil {
			return err
		}
	}

	return nil
}

func whiteInt(value int64) string {
	return color.WhiteString(fmt.Sprintf("%+v", value))
}

// clearScreen clears the screen so it can be redrawn
func clearScreen() {
	switch runtime.GOOS {
	case "linux", "darwin":
		cmd := exec.Command("clear")
		cmd.Stdout = os.Stdout
		_ = cmd.Run()
	case "windows":
		cmd := exec.Command("cmd", "/c", "cls")
		cmd.Stdout = os.Stdout
		_ = cmd.Run()
	default:
		fmt.Print(strings.Repeat("\n", 100))
	}
}

func getConnectionStatus(ctx context.Context, tc transport.Client, id *identity.FullIdentity) (bool, error) {
	bn := &pb.Node{
		Address: &pb.NodeAddress{
			Address:   dashboardCfg.BootstrapAddr,
			Transport: 0,
		},
		Type: pb.NodeType_BOOTSTRAP,
	}

	inspector, err := newInspectorClient(ctx, tc, bn)
	if err != nil {
		return false, err
	}

	resp, err := inspector.kad.PingNode(ctx, &pb.PingNodeRequest{
		Id:      id.ID,
		Address: dashboardCfg.ExternalAddress,
	})

	if err != nil {
		zap.S().Error(err)
		return false, err
	}

	if resp.GetOk() {
		return true, err
	}

	return false, err
}

func newInspectorClient(ctx context.Context, tc transport.Client, bn *pb.Node) (*Inspector, error) {
	conn, err := tc.DialNode(ctx, bn)
	if err != nil {
		return &Inspector{}, err
	}

	return &Inspector{
		kad: pb.NewKadInspectorClient(conn),
	}, nil

}