/*
 * Portions copyright 2019-present Open Networking Foundation
 * Original copyright 2019-present Ciena Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package commands

import (
	"context"
	"fmt"
	"os"
	"strconv"
	"strings"

	"github.com/jessevdk/go-flags"
	"github.com/olekukonko/tablewriter"
	pb "github.com/opencord/bbsim/api/bbsim"
	"github.com/opencord/bbsim/internal/bbsimctl/config"
	"github.com/opencord/cordctl/pkg/format"
	log "github.com/sirupsen/logrus"
)

const (
	DEFAULT_OLT_DEVICE_HEADER_FORMAT    = "table{{ .ID }}\t{{ .SerialNumber }}\t{{ .OperState }}\t{{ .InternalState }}\t{{ .IP }}"
	DEFAULT_OLT_RESOURCES_HEADER_FORMAT = "table{{ .Type }}\t{{ .PonPortId }}\t{{ .OnuId }}\t{{ .PortNo }}\t{{ .ResourceId }}\t{{ .FlowId }}"
	DEFAULT_NNI_PORT_HEADER_FORMAT      = "table{{ .ID }}\t{{ .OperState }}\t{{ .InternalState }}\t{{ .PacketCount }}"
	DEFAULT_PON_PORT_HEADER_FORMAT      = "table{{ .ID }}\t{{ .Technology }}\t{{ .OperState }}\t{{ .InternalState }}\t{{ .PacketCount }}\t{{ .AllocatedOnuIds }}\t{{ .AllocatedGemPorts }}\t{{ .AllocatedAllocIds }}"
)

type OltGet struct{}

type OltNNIs struct{}

type OltPONs struct{}

type OltShutdown struct{}

type OltPoweron struct{}

type OltReboot struct{}

type StopGrpcServer struct{}

type StartGrpcServer struct{}
type RestartGrpcServer struct {
	Args struct {
		Delay uint32
	} `positional-args:"yes" required:"yes"`
}

type OltFlows struct{}

type OltPoweronAllOnus struct{}

type OltShutdownAllOnus struct{}

type oltResourcesType string
type OltResources struct {
	Args struct {
		Type oltResourcesType
	} `positional-args:"yes" required:"yes"`
}

type oltOptions struct {
	Get             OltGet             `command:"get"`
	GetResources    OltResources       `command:"resources"`
	NNI             OltNNIs            `command:"nnis"`
	PON             OltPONs            `command:"pons"`
	Shutdown        OltShutdown        `command:"shutdown"`
	Poweron         OltPoweron         `command:"poweron"`
	Reboot          OltReboot          `command:"reboot"`
	Alarms          OltAlarmOptions    `command:"alarms"`
	Flows           OltFlows           `command:"flows"`
	PoweronAllOnus  OltPoweronAllOnus  `command:"poweronAllONUs"`
	ShutdownAllOnus OltShutdownAllOnus `command:"shutdownAllONUs"`
	StopServer      StopGrpcServer     `command:"stopServer"`
	StartServer     StartGrpcServer    `command:"startServer"`
	RestartServer   RestartGrpcServer  `command:"restartServer"`
}

func RegisterOltCommands(parser *flags.Parser) {
	_, _ = parser.AddCommand("olt", "OLT Commands", "Commands to query and manipulate the OLT device", &oltOptions{})
}

func getOLT() *pb.Olt {
	client, conn := connect()
	defer conn.Close()

	ctx, cancel := context.WithTimeout(context.Background(), config.GlobalConfig.Grpc.Timeout)
	defer cancel()
	olt, err := client.GetOlt(ctx, &pb.Empty{})
	if err != nil {
		log.Fatalf("could not get OLT: %v", err)
		return nil
	}
	return olt
}

func printOltHeader(prefix string, o *pb.Olt) {
	fmt.Println(fmt.Sprintf("%s : %s", prefix, o.SerialNumber))
	fmt.Println()
}

func (o *OltGet) Execute(args []string) error {
	olt := getOLT()

	// print out
	tableFormat := format.Format(DEFAULT_OLT_DEVICE_HEADER_FORMAT)
	_ = tableFormat.Execute(os.Stdout, true, olt)

	return nil
}

func (o *OltResources) Execute(args []string) error {
	client, conn := connect()
	defer conn.Close()

	resourceType := pb.OltAllocatedResourceType_Type_value[string(o.Args.Type)]

	ctx, cancel := context.WithTimeout(context.Background(), config.GlobalConfig.Grpc.Timeout)
	defer cancel()
	resources, err := client.GetOltAllocatedResources(ctx, &pb.OltAllocatedResourceType{Type: pb.OltAllocatedResourceType_Type(resourceType)})

	if err != nil {
		log.Fatalf("could not get OLT resources: %v", err)
		return nil
	}

	tableFormat := format.Format(DEFAULT_OLT_RESOURCES_HEADER_FORMAT)
	if err := tableFormat.Execute(os.Stdout, true, resources.Resources); err != nil {
		return err
	}
	return nil
}

func (o *OltNNIs) Execute(args []string) error {
	olt := getOLT()

	printOltHeader("NNI Ports for", olt)

	tableFormat := format.Format(DEFAULT_NNI_PORT_HEADER_FORMAT)
	_ = tableFormat.Execute(os.Stdout, true, olt.NNIPorts)

	return nil
}

func (o *OltPONs) Execute(args []string) error {
	olt := getOLT()

	printOltHeader("PON Ports for", olt)

	tableFormat := format.Format(DEFAULT_PON_PORT_HEADER_FORMAT)
	_ = tableFormat.Execute(os.Stdout, true, olt.PONPorts)

	return nil
}

func (o *OltShutdown) Execute(args []string) error {
	client, conn := connect()
	defer conn.Close()

	ctx, cancel := context.WithTimeout(context.Background(), config.GlobalConfig.Grpc.Timeout)
	defer cancel()

	res, err := client.ShutdownOlt(ctx, &pb.Empty{})

	if err != nil {
		log.Fatalf("Cannot shut down OLT: %v", err)
		return err
	}

	fmt.Println(fmt.Sprintf("[Status: %d] %s", res.StatusCode, res.Message))
	return nil
}

func (o *OltPoweron) Execute(args []string) error {
	client, conn := connect()
	defer conn.Close()

	ctx, cancel := context.WithTimeout(context.Background(), config.GlobalConfig.Grpc.Timeout)
	defer cancel()

	res, err := client.PoweronOlt(ctx, &pb.Empty{})

	if err != nil {
		log.Fatalf("Cannot power on OLT: %v", err)
		return err
	}

	fmt.Println(fmt.Sprintf("[Status: %d] %s", res.StatusCode, res.Message))
	return nil
}

func (o *OltReboot) Execute(args []string) error {
	client, conn := connect()
	defer conn.Close()

	ctx, cancel := context.WithTimeout(context.Background(), config.GlobalConfig.Grpc.Timeout)
	defer cancel()

	res, err := client.RebootOlt(ctx, &pb.Empty{})

	if err != nil {
		log.Fatalf("Cannot reboot OLT: %v", err)
		return err
	}

	fmt.Println(fmt.Sprintf("[Status: %d] %s", res.StatusCode, res.Message))
	return nil
}

func (o *StopGrpcServer) Execute(args []string) error {
	client, conn := connect()
	defer conn.Close()

	ctx, cancel := context.WithTimeout(context.Background(), config.GlobalConfig.Grpc.Timeout)
	defer cancel()

	res, err := client.StopgRPCServer(ctx, &pb.Empty{})

	if err != nil {
		log.Fatalf("Cannot stop Openolt server: %v", err)
		return err
	}

	fmt.Println(fmt.Sprintf("[Status: %d] %s", res.StatusCode, res.Message))
	return nil
}

func (o *StartGrpcServer) Execute(args []string) error {
	client, conn := connect()
	defer conn.Close()

	ctx, cancel := context.WithTimeout(context.Background(), config.GlobalConfig.Grpc.Timeout)
	defer cancel()

	res, err := client.StartgRPCServer(ctx, &pb.Empty{})

	if err != nil {
		log.Fatalf("Cannot start Openolt server: %v", err)
		return err
	}

	fmt.Println(fmt.Sprintf("[Status: %d] %s", res.StatusCode, res.Message))
	return nil
}

func (o *RestartGrpcServer) Execute(args []string) error {
	req := &pb.Timeout{
		Delay: o.Args.Delay,
	}
	client, conn := connect()
	defer conn.Close()

	ctx, cancel := context.WithTimeout(context.Background(), config.GlobalConfig.Grpc.Timeout)
	defer cancel()

	res, err := client.RestartgRPCServer(ctx, req)

	if err != nil {
		log.Fatalf("Cannot restart Openolt server: %v", err)
		return err
	}

	fmt.Println(fmt.Sprintf("[Status: %d] %s", res.StatusCode, res.Message))
	return nil
}

func (o *OltFlows) Execute(args []string) error {
	client, conn := connect()
	defer conn.Close()

	ctx, cancel := context.WithTimeout(context.Background(), config.GlobalConfig.Grpc.Timeout)
	defer cancel()

	req := pb.ONURequest{}
	res, err := client.GetFlows(ctx, &req)
	if err != nil {
		log.Errorf("Cannot get flows for OLT: %v", err)
		return err
	}

	if res.Flows == nil {
		fmt.Println("OLT has no flows")
		return nil
	}

	flowHeader := []string{
		"access_intf_id",
		"onu_id",
		"uni_id",
		"flow_id",
		"flow_type",
		"eth_type",
		"alloc_id",
		"network_intf_id",
		"gemport_id",
		"classifier",
		"action",
		"priority",
		"cookie",
		"port_no",
	}

	tableFlow := tablewriter.NewWriter(os.Stdout)
	tableFlow.SetRowLine(true)
	fmt.Fprintf(os.Stdout, "OLT Flows:\n")
	tableFlow.SetHeader(flowHeader)

	for _, flow := range res.Flows {
		flowInfo := []string{}
		flowInfo = append(flowInfo,
			strconv.Itoa(int(flow.AccessIntfId)),
			strconv.Itoa(int(flow.OnuId)),
			strconv.Itoa(int(flow.UniId)),
			strconv.Itoa(int(flow.FlowId)),
			flow.FlowType,
			fmt.Sprintf("%x", flow.Classifier.EthType),
			strconv.Itoa(int(flow.AllocId)),
			strconv.Itoa(int(flow.NetworkIntfId)),
			strconv.Itoa(int(flow.GemportId)),
			flow.Classifier.String(),
			flow.Action.String(),
			strconv.Itoa(int(flow.Priority)),
			strconv.Itoa(int(flow.Cookie)),
			strconv.Itoa(int(flow.PortNo)),
		)
		tableFlow.Append(flowInfo)
	}
	tableFlow.Render()
	tableFlow.SetNewLine("")
	return nil
}

func (o *OltPoweronAllOnus) Execute(args []string) error {
	client, conn := connect()
	defer conn.Close()

	ctx, cancel := context.WithTimeout(context.Background(), config.GlobalConfig.Grpc.Timeout)
	defer cancel()

	res, err := client.PoweronAllONUs(ctx, &pb.Empty{})

	if err != nil {
		log.Errorf("Cannot poweron all ONUs: %v", err)
		return err
	}

	fmt.Println(fmt.Sprintf("[Status: %d] %s", res.StatusCode, res.Message))
	return nil
}

func (o *OltShutdownAllOnus) Execute(args []string) error {
	client, conn := connect()
	defer conn.Close()

	ctx, cancel := context.WithTimeout(context.Background(), config.GlobalConfig.Grpc.Timeout)
	defer cancel()

	res, err := client.ShutdownAllONUs(ctx, &pb.Empty{})

	if err != nil {
		log.Errorf("Cannot shutdown all ONUs: %v", err)
		return err
	}

	fmt.Println(fmt.Sprintf("[Status: %d] %s", res.StatusCode, res.Message))
	return nil
}

func (rt *oltResourcesType) Complete(match string) []flags.Completion {
	list := make([]flags.Completion, 0)
	for k := range pb.OltAllocatedResourceType_Type_value {
		if strings.HasPrefix(k, strings.ToUpper(match)) && k != pb.OltAllocatedResourceType_UNKNOWN.String() {
			list = append(list, flags.Completion{Item: k})
		}
	}
	return list
}