/*
NAME
  RevidCLI.go

DESCRIPTION
  See Readme.md

AUTHORS
	Saxon A. Nelson-Milton <saxon@ausocean.org>
	Jack Richardson <jack@ausocean.org>

LICENSE
  RevidCLI.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)

  It is free software: you can redistribute it and/or modify them
  under the terms of the GNU General Public License as published by the
  Free Software Foundation, either version 3 of the License, or (at your
  option) any later version.

  It is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 for more details.

  You should have received a copy of the GNU General Public License
  along with revid in gpl.txt.  If not, see [GNU licenses](http://www.gnu.org/licenses).
*/
package main

import (
	"fmt"
	"errors"
	"os/exec"
	"flag"
	"strconv"
	"time"

	"bitbucket.org/ausocean/av/revid"
	"bitbucket.org/ausocean/IoT/pi/netsender"

	linuxproc "github.com/c9s/goprocinfo/linux"
)

// Indexes for configFlags
const (
	inputPtr              = 0
	inputCodecPtr         = 1
	outputPtr             = 2
	rtmpMethodPtr         = 3
	packetizationPtr      = 4
	quantizationModePtr   = 5
	verbosityPtr          = 6
	framesPerClipPtr      = 7
	rtmpUrlPtr            = 8
	bitratePtr            = 9
	outputFileNamePtr     = 10
	inputFileNamePtr      = 11
	heightPtr             = 12
	widthPtr              = 13
	frameRatePtr          = 14
	httpAddressPtr        = 15
	quantizationPtr       = 16
	timeoutPtr            = 17
	intraRefreshPeriodPtr = 18
)

// Other misc consts
const (
	sleepTime = 2 * 43200
	defaultRunDuration = 2 * 43200
	noOfConfigconfigFlags = 19
	revidStopTime = 5
	prepTime = 20
)

const (
	lightRelayPin = 19
	ds18b20Temp   = 60
	dht11Temp     = 40
	dht11Hum      = 41
	dht22Temp     = 50
	dht22Hum      = 51
	dhtPin        = 22
	cpuTemp       = 21
	cpuUsage      = 20
	priority      = 25
)

// Globals
var (
	configReceived bool = true
	varSum int 					= 0
	vars 								= make(map[string]string)
	revidInst revid.Revid
	config revid.Config
)

func main() {
	flagNames := [noOfConfigconfigFlags][2]string{
		{"Input", 							"The input type"},
		{"InputCodec", 					"The codec of the input"},
		{"Output", 							"The output type"},
		{"RtmpMethod", 					"The method used to send over rtmp (ffmpeg or librtmp)"},
		{"Packetization", 			"The method of data packetisation"},
		{"QuantizationMode",		"The level of quantization"},
		{"Verbosity", 					"Verbosity on or off"},
		{"FramesPerClip", 			"Number of frames per clip sent"},
		{"RtmpUrl", 						"Url of rtmp endpoint"},
		{"Bitrate", 						"Bitrate of recorded video"},
		{"OutputFileName", 			"The directory of the output file"},
		{"InputFileName", 			"The directory of the input file"},
		{"Height", 							"Height in pixels"},
		{"Width", 							"Width in pixels"},
		{"FrameRate", 					"Frame rate of captured video"},
		{"HttpAddress", 				"Destination address of http posts"},
		{"Quantization", 				"Desired quantization value"},
		{"Timeout", 						"Http timeout in seconds"},
		{"IntraRefreshPeriod",	"The IntraRefreshPeriod i.e. how many keyframes we send"},
	}

	// Create the configFlags based on the flagNames array
	configFlags := make([](*string),noOfConfigconfigFlags)
	for i := 0; i < noOfConfigconfigFlags; i++ {
		configFlags[i] = flag.String(flagNames[i][0], "", flagNames[i][1])
	}

	// Do we want a netsender session
	netSenderFlagPtr := flag.Bool("netSender", false, "Are we checking vars through netsender?")
	// User might also want to define how long revid runs for
	runDurationPtr := flag.Int("runDuration",defaultRunDuration,"How long do you want revid to run for?")

	flag.Parse()

	switch *configFlags[inputPtr] {
	case "Raspivid":
		config.Input = revid.Raspivid
	case "Rtp":
		config.Input = revid.Rtp
	case "File":
		config.Input = revid.File
	case "":
	default:
		fmt.Println("Bad input argument!")
	}

	switch *configFlags[inputCodecPtr] {
	case "H264Codec":
		config.InputCodec = revid.H264Codec
	case "":
	default:
		fmt.Println("Bad input codec argument!")
	}

	switch *configFlags[outputPtr] {
	case "File":
		config.Output = revid.File
	case "Http":
		config.Output = revid.Http
	case "NativeRtmp":
		config.Output = revid.NativeRtmp
	case "FfmpegRtmp":
		config.Output = revid.FfmpegRtmp
	case "":
	default:
		fmt.Println("Bad output argument!")
	}

	switch *configFlags[rtmpMethodPtr] {
	case "Ffmpeg":
		config.RtmpMethod = revid.Ffmpeg
	case "LibRtmp":
		config.RtmpMethod = revid.LibRtmp
	case "":
	default:
		fmt.Println("Bad rtmp method argument!")
	}

	switch *configFlags[packetizationPtr] {
	case "None":
		config.Packetization = revid.None
	case "Rtp":
		config.Packetization = revid.Rtp
	case "Flv":
		config.Packetization = revid.Flv
	case "":
	default:
		fmt.Println("Bad packetization argument!")
	}

	switch *configFlags[quantizationModePtr] {
	case "QuantizationOn":
		config.QuantizationMode = revid.QuantizationOn
	case "QuantizationOff":
		config.QuantizationMode = revid.QuantizationOff
	case "":
	default:
		fmt.Println("Bad quantization mode argument!")
	}

	switch *configFlags[verbosityPtr] {
	case "No":
		config.Verbosity = revid.No
	case "Yes":
		config.Verbosity = revid.Yes
	case "":
	default:
		fmt.Println("Bad verbosity argument!")
	}

	config.FramesPerClip 			= *configFlags[framesPerClipPtr]
	config.RtmpUrl 						= *configFlags[rtmpUrlPtr]
	config.Bitrate 						= *configFlags[bitratePtr]
	config.OutputFileName 		= *configFlags[outputFileNamePtr]
	config.InputFileName 			= *configFlags[inputFileNamePtr]
	config.Height 						= *configFlags[heightPtr]
	config.Width 							= *configFlags[widthPtr]
	config.FrameRate 					= *configFlags[frameRatePtr]
	config.HttpAddress 				= *configFlags[httpAddressPtr]
	config.Quantization 			= *configFlags[quantizationPtr]
	config.Timeout 						= *configFlags[timeoutPtr]
	config.IntraRefreshPeriod	= *configFlags[intraRefreshPeriodPtr]

	time.Sleep(time.Duration(prepTime) * time.Second)
	createRevidInstance()
	revidInst.Start()

	//init netsender
	if *netSenderFlagPtr{
		netsenderInit()
	}


	// Is the netsender flag been used ? if so run this loop
	for *netSenderFlagPtr {
		periodicNetsenderReport()
		sleepTime, _ := strconv.Atoi(netsender.GetConfigParam("monPeriod"))
		time.Sleep(time.Duration(sleepTime) * time.Second)
	}

	// If we're not running a netsender session then we run revid for the amount
	// of time the user defined or the default 2 days
	time.Sleep( time.Duration(*runDurationPtr) * time.Second )
	revidInst.Stop()
}

func netsenderInit() {
	//initialize netsender and assign function to check X pins
	netsender.InitRevidNetsender()
	netsender.ExternalReader = revidReportActions

	//try get initial config
	if err := netsender.GetConfig(); err != nil {
		//default to a config?????
		config.Logger.Log("Error", err.Error())
	} else {
		configReceived = true;
	}
}

//periodicNetsenderReport is called by the main function every monPeriod seconds. It makes sure a config has been recieved, and then
//reports back CPU stats and updates vars
func periodicNetsenderReport(){
	if !configReceived {
		if err := netsender.GetConfig(); err != nil {
			config.Logger.Log("Error", err.Error())
		} else {
			configReceived = true;
		}
	}

	inputs := []string{"X20", "X21"}
	if _, _, err := netsender.Send(netsender.RequestPoll, inputs); err != nil {
		config.Logger.Log("Error", err.Error())
	}

	if cloudVarSum := netsender.GetVarSum(); cloudVarSum != varSum {
		if newVars, err := netsender.GetVars(); err != nil {
			config.Logger.Log("Error", err.Error())
		} else {
			varSum = cloudVarSum
			for newVar, value := range newVars {
				if currentValue, varExists := vars[newVar]; !varExists || currentValue != value {
					vars[newVar] = value
				}
			}
		}
		updateRevid()
	}
}


func updateRevid() {
	revidInst.Stop()
	time.Sleep( time.Duration(revidStopTime) * time.Second )
	//look through var map and update revid where needed

	fmt.Printf("These are the vars: %v\n", vars)
	for key, value := range vars {
		switch key {
			case "FramesPerClip":
				asInt,err := strconv.Atoi(value)
				if asInt > 0 && err == nil {
					config.FramesPerClip = value
				}
			case "RtmpUrl":
				fmt.Println("@@@@@@ Updating the rtmp url!")
				config.RtmpUrl = value
			case "Bitrate":
				asInt,err := strconv.Atoi(value)
				if asInt > 0 && err == nil {
					config.Bitrate = value
				}
			case "OutputFileName":
				config.OutputFileName = value
			case "InputFileName":
				config.InputFileName = value
			case "Height":
				asInt,err := strconv.Atoi(value)
				if asInt > 0 && err == nil {
					config.Height = value
				}
			case "Width":
				asInt,err := strconv.Atoi(value)
				if asInt > 0 && err == nil {
					config.Width = value
				}
			case "FrameRate":
				asInt,err := strconv.Atoi(value)
				if asInt > 0 && err == nil {
					config.FrameRate = value
				}
			case "HttpAddress":
				config.HttpAddress = value
			case "Quantization":
				asInt,err := strconv.Atoi(value)
				if asInt > 0 && err == nil {
					config.Quantization = value
				}
			case "Timeout":
				asInt,err := strconv.Atoi(value)
				if asInt > 0 && err == nil {
					config.Timeout = value
				}
			case "IntraRefreshPeriod":
				asInt,err := strconv.Atoi(value)
				if asInt > 0 && err == nil {
					config.IntraRefreshPeriod = value
				}
		}
	}

	createRevidInstance()
	revidInst.Start()
}

func revidReportActions(pin int) (int, error) {
	switch {
	// case pin == ds18b20Temp:
	// 	sensors, err := ds18b20.Sensors()
	// 	if err != nil {
	// 		processManager.Logger.Log("Error", "Error retrieving connected sensors: "+err.Error())
	// 		return -1, errors.New("No sensors connected")
	// 	}

	// 	t, err := ds18b20.Temperature(sensors[0])
	// 	if err == nil {
	// 		return int(t), nil
	// 	}

	// 	return -1, errors.New("Unable to read temperature")

	// case pin == dht11Temp:
	// 	if val, _, _, err := dht.ReadDHTxxWithRetry(dht.DHT11, dhtPin, false, 5); err != nil {
	// 		return -1, errors.New("DHT Read Err: " + err.Error())
	// 	} else {
	// 		return int(val), nil
	// 	}

	// case pin == dht11Hum:
	// 	if _, val, _, err := dht.ReadDHTxxWithRetry(dht.DHT11, dhtPin, false, 5); err != nil {
	// 		return -1, errors.New("DHT Read Err: " + err.Error())
	// 	} else {
	// 		return int(val), nil
	// 	}

	// case pin == dht22Temp:
	// 	if val, _, _, err := dht.ReadDHTxxWithRetry(dht.DHT22, dhtPin, false, 5); err != nil {
	// 		return -1, errors.New("DHT Read Err: " + err.Error())
	// 	} else {
	// 		return int(val), nil
	// 	}

	// case pin == dht22Hum:
	// 	if _, val, _, err := dht.ReadDHTxxWithRetry(dht.DHT22, dhtPin, false, 5); err != nil {
	// 		return -1, errors.New("DHT Read Err: " + err.Error())
	// 	} else {
	// 		return int(val), nil
	// 	}

	//function to measure temp of cpu
	case pin == cpuTemp:
		var out []byte
		var err error
		var val float64
		if out, err = exec.Command("/opt/vc/bin/vcgencmd", "measure_temp").Output(); err != nil {
			return -1, errors.New("CPU Temp Read Err: " + err.Error())
		}
		if val, err = strconv.ParseFloat(string(out[5:len(out)-3]), 32); err != nil {
			return -1, errors.New("CPU Temp Read Err: " + err.Error())
		}
		return int(val), nil
	//function to measure usage of cpu
	case pin == cpuUsage:
		stat, err := linuxproc.ReadStat("/proc/stat")
		if err != nil {
			return -1, errors.New("CPU Uage Read Err: " + err.Error())
		}
		total1 := stat.CPUStatAll.User + stat.CPUStatAll.Nice + stat.CPUStatAll.System +
			stat.CPUStatAll.Idle + stat.CPUStatAll.IOWait + stat.CPUStatAll.IRQ +
			stat.CPUStatAll.SoftIRQ + stat.CPUStatAll.Steal + stat.CPUStatAll.Guest +
			stat.CPUStatAll.GuestNice
		idle1 := stat.CPUStatAll.Idle

		time.Sleep(time.Millisecond * 100)

		stat, err = linuxproc.ReadStat("/proc/stat")
		if err != nil {
			return -1, errors.New("CPU Usage Read Err: " + err.Error())
		}
		total2 := stat.CPUStatAll.User + stat.CPUStatAll.Nice + stat.CPUStatAll.System +
			stat.CPUStatAll.Idle + stat.CPUStatAll.IOWait + stat.CPUStatAll.IRQ +
			stat.CPUStatAll.SoftIRQ + stat.CPUStatAll.Steal + stat.CPUStatAll.Guest +
			stat.CPUStatAll.GuestNice
		idle2 := stat.CPUStatAll.Idle

		return int((1.0 - (float64(idle2-idle1) / float64(total2-total1))) * 100), nil

	// case pin == priority:
	// 	return int(processManager.PriorityLevel), nil

	default:
		return -1, errors.New("External pin" + strconv.Itoa(pin) + " not defined")
	}
}

func createRevidInstance(){
	// Try to create the revid instance with the given config
	var err error
	for revidInst, err = revid.NewRevid(config); err != nil; {
		// If the config does have a logger, use it to output error, otherwise
		// just output to std output
		if config.Logger != nil {
			config.Logger.Log("FATAL ERROR", err.Error())
		} else {
			fmt.Printf("FATAL ERROR: %v", err.Error())
		}
	}
}