/*
* Copyright 2022-present Open Networking Foundation
* 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 controller

import (
	"context"
	"errors"
	"sync"
	"time"

	"encoding/hex"

	"voltha-go-controller/database"
	errorCodes "voltha-go-controller/internal/pkg/errorcodes"
	"voltha-go-controller/internal/pkg/intf"
	"voltha-go-controller/internal/pkg/of"
	"voltha-go-controller/internal/pkg/tasks"
	"voltha-go-controller/internal/pkg/util"
	"voltha-go-controller/internal/pkg/vpagent"

	"voltha-go-controller/log"
)

var logger log.CLogger
var ctx = context.TODO()

func init() {
	// Setup this package so that it's log level can be modified at run time
	var err error
	logger, err = log.AddPackageWithDefaultParam()
	if err != nil {
		panic(err)
	}
}

var db database.DBIntf

var deviceTableSyncDuration = 15 * time.Minute

//SetDeviceTableSyncDuration - sets interval between device table sync up activity
//  duration - in minutes
func SetDeviceTableSyncDuration(duration int) {
	deviceTableSyncDuration = time.Duration(duration) * time.Minute
}

// VoltController structure
type VoltController struct {
	rebootLock              sync.Mutex
	rebootInProgressDevices map[string]string
	devices                 map[string]*Device
	deviceLock              sync.RWMutex
	vagent                  map[string]*vpagent.VPAgent
	ctx                     context.Context
	app                     intf.App
	RebootFlow              bool
	BlockedDeviceList       *util.ConcurrentMap
	deviceTaskQueue         *util.ConcurrentMap
}

var vcontroller *VoltController

// NewController is the constructor for VoltController
func NewController(ctx context.Context, app intf.App) intf.IVPClientAgent {
	var controller VoltController

	controller.rebootInProgressDevices = make(map[string]string)
	controller.devices = make(map[string]*Device)
	controller.deviceLock = sync.RWMutex{}
	controller.ctx = ctx
	controller.app = app
	controller.BlockedDeviceList = util.NewConcurrentMap()
	controller.deviceTaskQueue = util.NewConcurrentMap()
	db = database.GetDatabase()
	vcontroller = &controller
	return &controller
}

// AddDevice to add device
func (v *VoltController) AddDevice(config *intf.VPClientCfg) intf.IVPClient {

	d := NewDevice(config.DeviceID, config.SerialNum, config.VolthaClient, config.SouthBoundID)
	v.devices[config.DeviceID] = d
	v.app.AddDevice(d.ID, d.SerialNum, config.SouthBoundID)

	d.RestoreMetersFromDb()
	d.RestoreGroupsFromDb()
	d.RestoreFlowsFromDb()
	d.RestorePortsFromDb()
	d.ConnectInd(context.TODO(), intf.DeviceDisc)
	d.packetOutChannel = config.PacketOutChannel

	logger.Warnw(ctx, "Added device", log.Fields{"Device": config.DeviceID, "SerialNo": d.SerialNum, "State": d.State})

	return d
}

// DelDevice to delete device
func (v *VoltController) DelDevice(id string) {
	d, ok := v.devices[id]
	if ok {
		delete(v.devices, id)
		d.Delete()
	}
	v.app.DelDevice(id)
	d.cancel() // To stop the device tables sync routine
	logger.Warnw(ctx, "Deleted device", log.Fields{"Device": id})
}

//AddControllerTask - add task to controller queue
func (v *VoltController) AddControllerTask(device string, task tasks.Task) {
	var taskQueueIntf interface{}
	var taskQueue *tasks.Tasks
	var found bool
	if taskQueueIntf, found = v.deviceTaskQueue.Get(device); !found {
		taskQueue = tasks.NewTasks(context.TODO())
		v.deviceTaskQueue.Set(device, taskQueue)
	} else {
		taskQueue = taskQueueIntf.(*tasks.Tasks)
	}
	taskQueue.AddTask(task)
	logger.Warnw(ctx, "Task Added to Controller Task List", log.Fields{"Len": taskQueue.NumPendingTasks(), "Total": taskQueue.TotalTasks()})
}

//AddNewDevice - called when new device is discovered. This will be
//processed as part of controller queue
func (v *VoltController) AddNewDevice(config *intf.VPClientCfg) {
	adt := NewAddDeviceTask(config)
	v.AddControllerTask(config.DeviceID, adt)
}

// GetDevice to get device info
func (v *VoltController) GetDevice(id string) (*Device, error) {
	d, ok := v.devices[id]
	if ok {
		return d, nil
	}
	return nil, errorCodes.ErrDeviceNotFound
}

// IsRebootInProgressForDevice to check if reboot is in progress for the device
func (v *VoltController) IsRebootInProgressForDevice(device string) bool {
	v.rebootLock.Lock()
	defer v.rebootLock.Unlock()
	_, ok := v.rebootInProgressDevices[device]
	return ok
}

// SetRebootInProgressForDevice to set reboot in progress for the device
func (v *VoltController) SetRebootInProgressForDevice(device string) bool {
	v.rebootLock.Lock()
	defer v.rebootLock.Unlock()
	_, ok := v.rebootInProgressDevices[device]
	if ok {
		return true
	}
	v.rebootInProgressDevices[device] = device
	logger.Warnw(ctx, "Setted Reboot-In-Progress flag", log.Fields{"Device": device})

	d, err := v.GetDevice(device)
	if err == nil {
		d.ResetCache()
	} else {
		logger.Errorw(ctx, "Failed to get device", log.Fields{"Device": device, "Error": err})
	}

	return true
}

// ReSetRebootInProgressForDevice to reset reboot in progress for the device
func (v *VoltController) ReSetRebootInProgressForDevice(device string) bool {
	v.rebootLock.Lock()
	defer v.rebootLock.Unlock()
	_, ok := v.rebootInProgressDevices[device]
	if !ok {
		return true
	}
	delete(v.rebootInProgressDevices, device)
	logger.Warnw(ctx, "Resetted Reboot-In-Progress flag", log.Fields{"Device": device})
	return true
}

// DeviceRebootInd is device reboot indication
func (v *VoltController) DeviceRebootInd(dID string, srNo string, sbID string) {
	v.app.DeviceRebootInd(dID, srNo, sbID)
	_ = db.DelAllRoutesForDevice(dID)
	_ = db.DelAllGroup(dID)
	_ = db.DelAllMeter(dID)
	_ = db.DelAllPONCounters(dID)
}

// DeviceDisableInd is device deactivation indication
func (v *VoltController) DeviceDisableInd(dID string) {
	v.app.DeviceDisableInd(dID)
}

//TriggerPendingProfileDeleteReq - trigger pending profile delete requests
func (v *VoltController) TriggerPendingProfileDeleteReq(device string) {
	v.app.TriggerPendingProfileDeleteReq(device)
}

//TriggerPendingMigrateServicesReq - trigger pending services migration requests
func (v *VoltController) TriggerPendingMigrateServicesReq(device string) {
	v.app.TriggerPendingMigrateServicesReq(device)
}

// SetAuditFlags to set the audit flags
func (v *VoltController) SetAuditFlags(device *Device) {
	v.app.SetRebootFlag(true)
	device.auditInProgress = true
}

// ResetAuditFlags to reset the audit flags
func (v *VoltController) ResetAuditFlags(device *Device) {
	v.app.SetRebootFlag(false)
	device.auditInProgress = false
}

//ProcessFlowModResultIndication - send flow mod result notification
func (v *VoltController) ProcessFlowModResultIndication(flowStatus intf.FlowStatus) {
	v.app.ProcessFlowModResultIndication(flowStatus)
}

// AddVPAgent to add the vpagent
func (v *VoltController) AddVPAgent(vep string, vpa *vpagent.VPAgent) {
	v.vagent[vep] = vpa
}

// VPAgent to get vpagent info
func (v *VoltController) VPAgent(vep string) (*vpagent.VPAgent, error) {
	vpa, ok := v.vagent[vep]
	if ok {
		return vpa, nil
	}
	return nil, errors.New("VPA Not Registered")
}

// PacketOutReq for packet out request
func (v *VoltController) PacketOutReq(device string, inport string, outport string, pkt []byte, isCustomPkt bool) error {
	logger.Debugw(ctx, "Packet Out Req", log.Fields{"Device": device, "OutPort": outport})
	d, err := v.GetDevice(device)
	if err != nil {
		return err
	}
	logger.Debugw(ctx, "Packet Out Pkt", log.Fields{"Pkt": hex.EncodeToString(pkt)})
	return d.PacketOutReq(inport, outport, pkt, isCustomPkt)
}

// AddFlows to add flows
func (v *VoltController) AddFlows(port string, device string, flow *of.VoltFlow) error {
	d, err := v.GetDevice(device)
	if err != nil {
		logger.Errorw(ctx, "Device Not Found", log.Fields{"Device": device})
		return err
	}
	devPort := d.GetPortByName(port)
	if devPort == nil {
		logger.Errorw(ctx, "Port Not Found", log.Fields{"Device": device})
		return errorCodes.ErrPortNotFound
	}
	if d.ctx == nil {
		//FIXME: Application should know the context before it could submit task. Handle at application level
		logger.Errorw(ctx, "Context is missing. AddFlow Operation Not added to Task", log.Fields{"Device": device})
		return errorCodes.ErrInvalidParamInRequest
	}

	var isMigrationRequired bool
	if flow.MigrateCookie {
		// flow migration to new cookie must be done only during the audit. Migration for all subflows must be done if
		// atlease one subflow with old cookie found in the device.
		for _, subFlow := range flow.SubFlows {
			if isMigrationRequired = d.IsFlowPresentWithOldCookie(subFlow); isMigrationRequired {
				break
			}
		}
	}

	if isMigrationRequired {
		// In this case, the flow is updated in local cache and db here.
		// Actual flow deletion and addition at voltha will happen during flow tables audit.
		for _, subFlow := range flow.SubFlows {
			logger.Debugw(ctx, "Cookie Migration Required", log.Fields{"OldCookie": subFlow.OldCookie, "NewCookie": subFlow.Cookie})
			if err := d.DelFlowWithOldCookie(subFlow); err != nil {
				logger.Errorw(ctx, "Delete flow with old cookie failed", log.Fields{"Error": err, "OldCookie": subFlow.OldCookie})
			}
			if err := d.AddFlow(subFlow); err != nil {
				logger.Errorw(ctx, "Flow Add Failed", log.Fields{"Error": err, "Cookie": subFlow.Cookie})
			}
		}
	} else {
		flow.Command = of.CommandAdd
		d.UpdateFlows(flow, devPort)
		for cookie := range flow.SubFlows {
			logger.Debugw(ctx, "Flow Add added to queue", log.Fields{"Cookie": cookie, "Device": device, "Port": port})
		}
	}
	return nil
}

// DelFlows to delete flows
func (v *VoltController) DelFlows(port string, device string, flow *of.VoltFlow) error {
	d, err := v.GetDevice(device)
	if err != nil {
		logger.Errorw(ctx, "Device Not Found", log.Fields{"Device": device})
		return err
	}
	devPort := d.GetPortByName(port)
	if devPort == nil {
		logger.Errorw(ctx, "Port Not Found", log.Fields{"Device": device})
		return errorCodes.ErrPortNotFound
	}
	if d.ctx == nil {
		//FIXME: Application should know the context before it could submit task. Handle at application level
		logger.Errorw(ctx, "Context is missing. DelFlow Operation Not added to Task", log.Fields{"Device": device})
		return errorCodes.ErrInvalidParamInRequest
	}

	var isMigrationRequired bool
	if flow.MigrateCookie {
		// flow migration to new cookie must be done only during the audit. Migration for all subflows must be done if
		// atlease one subflow with old cookie found in the device.
		for _, subFlow := range flow.SubFlows {
			if isMigrationRequired = d.IsFlowPresentWithOldCookie(subFlow); isMigrationRequired {
				break
			}
		}
	}

	if isMigrationRequired {
		// In this case, the flow is deleted from local cache and db here.
		// Actual flow deletion at voltha will happen during flow tables audit.
		for _, subFlow := range flow.SubFlows {
			logger.Debugw(ctx, "Old Cookie delete Required", log.Fields{"OldCookie": subFlow.OldCookie})
			if err := d.DelFlowWithOldCookie(subFlow); err != nil {
				logger.Errorw(ctx, "DelFlowWithOldCookie failed", log.Fields{"OldCookie": subFlow.OldCookie, "Error": err})
			}
		}
	} else {
		flow.Command = of.CommandDel
		d.UpdateFlows(flow, devPort)
		for cookie := range flow.SubFlows {
			logger.Debugw(ctx, "Flow Del added to queue", log.Fields{"Cookie": cookie, "Device": device, "Port": port})
		}
	}
	return nil
}

// GroupUpdate for group update
func (v *VoltController) GroupUpdate(port string, device string, group *of.Group) error {
	d, err := v.GetDevice(device)
	if err != nil {
		logger.Errorw(ctx, "Device Not Found", log.Fields{"Device": device})
		return err
	}

	devPort := d.GetPortByName(port)
	if devPort == nil {
		logger.Errorw(ctx, "Port Not Found", log.Fields{"Device": device})
		return errorCodes.ErrPortNotFound
	}

	if d.ctx == nil {
		//FIXME: Application should know the context before it could submit task. Handle at application level
		logger.Errorw(ctx, "Context is missing. GroupMod Operation Not added to task", log.Fields{"Device": device})
		return errorCodes.ErrInvalidParamInRequest
	}

	d.UpdateGroup(group, devPort)
	return nil
}

// ModMeter to get mod meter info
func (v *VoltController) ModMeter(port string, device string, command of.MeterCommand, meter *of.Meter) error {
	d, err := v.GetDevice(device)
	if err != nil {
		logger.Errorw(ctx, "Device Not Found", log.Fields{"Device": device})
		return err
	}

	devPort := d.GetPortByName(port)
	if devPort == nil {
		logger.Errorw(ctx, "Port Not Found", log.Fields{"Device": device})
		return errorCodes.ErrPortNotFound
	}

	d.ModMeter(command, meter, devPort)
	return nil
}

// PortAddInd for port add indication
func (v *VoltController) PortAddInd(device string, id uint32, name string) {
	v.app.PortAddInd(device, id, name)
}

// PortDelInd for port delete indication
func (v *VoltController) PortDelInd(device string, port string) {
	v.app.PortDelInd(device, port)
}

// PortUpdateInd for port update indication
func (v *VoltController) PortUpdateInd(device string, name string, id uint32) {
	v.app.PortUpdateInd(device, name, id)
}

// PortUpInd for port up indication
func (v *VoltController) PortUpInd(device string, port string) {
	v.app.PortUpInd(device, port)
}

// PortDownInd for port down indication
func (v *VoltController) PortDownInd(device string, port string) {
	v.app.PortDownInd(device, port)
}

// DeviceUpInd for device up indication
func (v *VoltController) DeviceUpInd(device string) {
	v.app.DeviceUpInd(device)
}

// DeviceDownInd for device down indication
func (v *VoltController) DeviceDownInd(device string) {
	v.app.DeviceDownInd(device)
}

// PacketInInd for packet in indication
func (v *VoltController) PacketInInd(device string, port string, data []byte) {
	v.app.PacketInInd(device, port, data)
}

// GetPortState to get port status
func (v *VoltController) GetPortState(device string, name string) (PortState, error) {
	d, err := v.GetDevice(device)
	if err != nil {
		logger.Errorw(ctx, "Device Not Found", log.Fields{"Device": device})
		return PortStateDown, err
	}
	return d.GetPortState(name)
}

// UpdateMvlanProfiles for update mvlan profiles
func (v *VoltController) UpdateMvlanProfiles(device string) {
	v.app.UpdateMvlanProfilesForDevice(device)
}

// GetController to get controller
func GetController() *VoltController {
	return vcontroller
}

/*
// PostIndication to post indication
func (v *VoltController) PostIndication(device string, task interface{}) error {
	var srvTask AddServiceIndTask
	var portTask AddPortIndTask
	var taskCommon tasks.Task
	var isSvcTask bool

	switch data := task.(type) {
	case *AddServiceIndTask:
		srvTask = *data
		taskCommon = data
		isSvcTask = true
	case *AddPortIndTask:
		portTask = *data
		taskCommon = data
	}

	d, err := v.GetDevice(device)
	if err != nil {
		logger.Errorw(ctx, "Device Not Found", log.Fields{"Device": device})
		//It means device itself it not present so just post the indication directly
		if isSvcTask {
			msgbus.PostAccessConfigInd(srvTask.result, d.SerialNum, srvTask.indicationType, srvTask.serviceName, 0, srvTask.reason, srvTask.trigger, srvTask.portState)
		} else {
			msgbus.ProcessPortInd(portTask.indicationType, d.SerialNum, portTask.portName, portTask.accessConfig, portTask.serviceList)
		}
		return err
	}
	if taskCommon != nil {
		d.AddTask(taskCommon)
	}
	return nil
}
*/

// GetTaskList to get the task list
func (v *VoltController) GetTaskList(device string) []tasks.Task {
	d, err := v.GetDevice(device)
	if err != nil || d.ctx == nil {
		logger.Errorw(ctx, "Device Not Connected/Found", log.Fields{"Device": device, "Dev Obj": d})
		return []tasks.Task{}
	}
	return d.GetTaskList()

}

// AddBlockedDevices to add devices to blocked devices list
func (v *VoltController) AddBlockedDevices(deviceSerialNumber string) {
	v.BlockedDeviceList.Set(deviceSerialNumber, deviceSerialNumber)
}

// DelBlockedDevices to remove device from blocked device list
func (v *VoltController) DelBlockedDevices(deviceSerialNumber string) {
	v.BlockedDeviceList.Remove(deviceSerialNumber)
}

// IsBlockedDevice to check if device is blocked
func (v *VoltController) IsBlockedDevice(deviceSerialNumber string) bool {
	_, ifPresent := v.BlockedDeviceList.Get(deviceSerialNumber)
	return ifPresent
}