/*
 Copyright 2017 the original author or authors.

 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 api

import (
	"errors"
	"fmt"
	"io/ioutil"
	"log"
	"net"
	"net/http"
	"os"
	"strings"
	"sync"

	"gerrit.opencord.org/abstract-olt/internal/pkg/settings"
	"gerrit.opencord.org/abstract-olt/models"
	"gerrit.opencord.org/abstract-olt/models/abstract"
	"gerrit.opencord.org/abstract-olt/models/physical"
	"github.com/mongodb/mongo-go-driver/bson"
	"github.com/mongodb/mongo-go-driver/mongo"
	"github.com/mongodb/mongo-go-driver/mongo/updateopt"
	context "golang.org/x/net/context"
)

/*
Server instance of the grpc server
*/
type Server struct {
}

var syncChan chan bool
var isDirty bool

var runOnce sync.Once

func getSyncChannel() chan bool {
	runOnce.Do(func() {
		syncChan = make(chan bool, 1)
		syncChan <- true
	})

	return syncChan
}
func done(myChan chan bool, done bool) {
	myChan <- done
}

/*
Echo - Tester function which just returns same string sent to it
*/
func (s *Server) Echo(ctx context.Context, in *EchoMessage) (*EchoReplyMessage, error) {
	myChan := getSyncChannel()
	<-myChan
	defer done(myChan, true)
	fmt.Println("HELLO WTF")
	ping := in.GetPing()
	pong := EchoReplyMessage{Pong: ping}
	return &pong, nil
}

/*
CreateChassis - allocates a new Chassis struct and stores it in chassisMap
*/
func (s *Server) CreateChassis(ctx context.Context, in *AddChassisMessage) (*AddChassisReturn, error) {
	myChan := getSyncChannel()
	fmt.Println("after getSyncChannel")
	<-myChan
	defer done(myChan, true)
	chassisMap := models.GetChassisMap()
	clli := in.GetCLLI()

	xosIP := net.ParseIP(in.GetXOSIP())
	xosPort := int(in.GetXOSPort())
	if xosIP == nil {
		errStr := fmt.Sprintf("Invalid IP %s supplied for XOSIP", in.GetXOSIP())
		return nil, errors.New(errStr)
	}

	xosAddress := net.TCPAddr{IP: xosIP, Port: xosPort}

	xosUser := in.GetXOSUser()
	xosPassword := in.GetXOSPassword()
	if xosUser == "" || xosPassword == "" {
		return nil, errors.New("Either XOSUser or XOSPassword supplied were empty")
	}
	loginWorked := testLogin(xosUser, xosPassword, xosIP, xosPort)
	if !loginWorked {
		return nil, errors.New("Unable to validate login not creating Abstract Chassis")
	}
	shelf := int(in.GetShelf())
	rack := int(in.GetRack())

	chassisHolder := (*chassisMap)[clli]
	if chassisHolder != nil {
		return &AddChassisReturn{DeviceID: chassisHolder.AbstractChassis.CLLI}, nil
	}

	abstractChassis := abstract.GenerateChassis(clli, int(in.GetRack()), int(in.GetShelf()))
	phyChassis := physical.Chassis{CLLI: clli, XOSUser: xosUser, XOSPassword: xosPassword, XOSAddress: xosAddress, Rack: rack, Shelf: shelf}

	chassisHolder = &models.ChassisHolder{AbstractChassis: abstractChassis, PhysicalChassis: phyChassis}
	if settings.GetDebug() {
		output := fmt.Sprintf("%v", abstractChassis)
		formatted := strings.Replace(output, "{", "\n{", -1)
		log.Printf("new chassis %s\n", formatted)
	}
	(*chassisMap)[clli] = chassisHolder
	isDirty = true
	return &AddChassisReturn{DeviceID: clli}, nil
}

/*
ChangeXOSUserPassword - allows update of xos credentials
*/
func (s *Server) ChangeXOSUserPassword(ctx context.Context, in *ChangeXOSUserPasswordMessage) (*ChangeXOSUserPasswordReturn, error) {
	myChan := getSyncChannel()
	<-myChan
	defer done(myChan, true)
	clli := in.GetCLLI()
	xosUser := in.GetXOSUser()
	xosPassword := in.GetXOSPassword()
	if xosUser == "" || xosPassword == "" {
		return nil, errors.New("Either XOSUser or XOSPassword supplied were empty")
	}
	chassisMap := models.GetChassisMap()
	chassisHolder := (*chassisMap)[clli]
	if chassisHolder == nil {
		errString := fmt.Sprintf("There is no chassis with CLLI of %s", clli)
		return nil, errors.New(errString)
	}
	xosIP := chassisHolder.PhysicalChassis.XOSAddress.IP
	xosPort := chassisHolder.PhysicalChassis.XOSAddress.Port
	loginWorked := testLogin(xosUser, xosPassword, xosIP, xosPort)
	if !loginWorked {
		return nil, errors.New("Unable to validate login when changing password")
	}

	chassisHolder.PhysicalChassis.XOSUser = xosUser
	chassisHolder.PhysicalChassis.XOSPassword = xosPassword
	isDirty = true
	return &ChangeXOSUserPasswordReturn{Success: true}, nil

}

/*
CreateOLTChassis adds an OLT chassis/line card to the Physical chassis
*/
func (s *Server) CreateOLTChassis(ctx context.Context, in *AddOLTChassisMessage) (*AddOLTChassisReturn, error) {
	myChan := getSyncChannel()
	<-myChan
	defer done(myChan, true)
	fmt.Printf(" CreateOLTChassis %v \n", *in)
	chassisMap := models.GetChassisMap()
	clli := in.GetCLLI()
	chassisHolder := (*chassisMap)[clli]
	if chassisHolder == nil {
		errString := fmt.Sprintf("There is no chassis with CLLI of %s", clli)
		return &AddOLTChassisReturn{DeviceID: "", ChassisDeviceID: ""}, errors.New(errString)
	}
	oltType := in.GetType()
	address := net.TCPAddr{IP: net.ParseIP(in.GetSlotIP()), Port: int(in.GetSlotPort())}
	physicalChassis := &chassisHolder.PhysicalChassis
	sOlt := physical.SimpleOLT{CLLI: clli, Hostname: in.GetHostname(), Address: address, Parent: physicalChassis}
	switch oltType {
	case AddOLTChassisMessage_edgecore:
		sOlt.CreateEdgecore()
	case AddOLTChassisMessage_adtran:
	case AddOLTChassisMessage_tibit:
	}
	physicalChassis.AddOLTChassis(sOlt)
	ports := sOlt.GetPorts()
	for i := 0; i < len(ports); i++ {
		absPort, _ := chassisHolder.AbstractChassis.NextPort()

		absPort.PhysPort = &ports[i]
		//AssignTraits(&ports[i], absPort)
	}
	isDirty = true
	return &AddOLTChassisReturn{DeviceID: in.GetHostname(), ChassisDeviceID: clli}, nil

}

/*
ProvisionOnt provisions an ONT on a specific Chassis/LineCard/Port
*/
func (s *Server) ProvisionOnt(ctx context.Context, in *AddOntMessage) (*AddOntReturn, error) {
	myChan := getSyncChannel()
	<-myChan
	defer done(myChan, true)
	chassisMap := models.GetChassisMap()
	clli := in.GetCLLI()
	chassisHolder := (*chassisMap)[clli]
	if chassisHolder == nil {
		errString := fmt.Sprintf("There is no chassis with CLLI of %s", clli)
		return &AddOntReturn{Success: false}, errors.New(errString)
	}
	err := chassisHolder.AbstractChassis.ActivateONT(int(in.GetSlotNumber()), int(in.GetPortNumber()), int(in.GetOntNumber()), in.GetSerialNumber())

	if err != nil {
		return nil, err
	}
	isDirty = true
	return &AddOntReturn{Success: true}, nil
}

/*
DeleteOnt - deletes a previously provision ont
*/
func (s *Server) DeleteOnt(ctx context.Context, in *DeleteOntMessage) (*DeleteOntReturn, error) {
	myChan := getSyncChannel()
	<-myChan
	defer done(myChan, true)
	chassisMap := models.GetChassisMap()
	clli := in.GetCLLI()
	chassisHolder := (*chassisMap)[clli]
	err := chassisHolder.AbstractChassis.DeleteONT(int(in.GetSlotNumber()), int(in.GetPortNumber()), int(in.GetOntNumber()), in.GetSerialNumber())
	if err != nil {
		return nil, err
	}
	isDirty = true
	return &DeleteOntReturn{Success: true}, nil
}

func (s *Server) Output(ctx context.Context, in *OutputMessage) (*OutputReturn, error) {
	return DoOutput()

}
func DoOutput() (*OutputReturn, error) {
	if isDirty {
		myChan := getSyncChannel()
		<-myChan
		defer done(myChan, true)
		chassisMap := models.GetChassisMap()
		if settings.GetMongo() {
			client, err := mongo.NewClient(settings.GetMongodb())
			client.Connect(context.Background())
			if err != nil {
				log.Printf("client connect to mongo db @%s failed with %v\n", settings.GetMongodb(), err)
			}
			defer client.Disconnect(context.Background())
			for clli, chassisHolder := range *chassisMap {
				json, _ := (chassisHolder).Serialize()
				collection := client.Database("AbstractOLT").Collection("backup")
				doc := bson.NewDocument(bson.EC.String("_id", clli))
				filter := bson.NewDocument(bson.EC.String("_id", clli))
				doc.Append(bson.EC.Binary("body", json))

				updateDoc := bson.NewDocument(bson.EC.SubDocument("$set", doc))
				//update or insert if not existent
				res, err := collection.UpdateOne(context.Background(), filter, updateDoc, updateopt.Upsert(true))
				if err != nil {
					log.Printf("collection.UpdateOne failed with %v\n", err)
				} else {
					id := res.UpsertedID
					if settings.GetDebug() {
						log.Printf("Update Succeeded with id %v\n", id)
					}
				}
			}
		} else {
			for clli, chassisHolder := range *chassisMap {

				json, _ := (chassisHolder).Serialize()
				if settings.GetMongo() {

				} else {
					//TODO parameterize dump location
					backupFile := fmt.Sprintf("backup/%s", clli)
					f, _ := os.Create(backupFile)

					defer f.Close()

					_, _ = f.WriteString(string(json))
					f.Sync()
				}
			}
		}
		isDirty = false
	} else {
		if settings.GetDebug() {
			log.Print("Not dirty not dumping config")
		}

	}
	return &OutputReturn{Success: true}, nil

}
func testLogin(xosUser string, xosPassword string, xosIP net.IP, xosPort int) bool {
	if settings.GetDummy() {
		return true
	}
	var dummyYaml = `
tosca_definitions_version: tosca_simple_yaml_1_0
imports:
  - custom_types/site.yaml
description: anything
topology_template:
  node_templates:
    mysite:
      type: tosca.nodes.Site
      properties:
        must-exist: true
        name: mysite
`
	client := &http.Client{}
	requestList := fmt.Sprintf("http://%s:%d/run", xosIP, xosPort)
	req, err := http.NewRequest("POST", requestList, strings.NewReader(dummyYaml))
	req.Header.Add("xos-username", xosUser)
	req.Header.Add("xos-password", xosPassword)
	resp, err := client.Do(req)
	log.Printf("testLogin resp:%v", resp)
	if err != nil {
		log.Printf("Unable to validate XOS Login Information %v", err)
		return false
	}
	defer resp.Body.Close()

	if resp.StatusCode == http.StatusOK {
		bodyBytes, _ := ioutil.ReadAll(resp.Body)
		bodyString := string(bodyBytes)
		fmt.Println(bodyString)
		return true
	}
	return false

}