/*
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) 2017-2018 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 (
	"errors"
	"flag"
	"fmt"
	"os"
	"os/exec"
	"strconv"
	"strings"
	"time"

	"bitbucket.org/ausocean/av/revid"
	"bitbucket.org/ausocean/iot/pi/netsender"
	"bitbucket.org/ausocean/utils/smartlogger"

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

const (
	// progName is the program name for logging purposes.
	progName = "revid-cli"

	// Logging is set to INFO level.
	loggerVerbosity = 3
)

// Indexes for configFlags
const (
	inputPtr = iota
	inputCodecPtr
	outputPtr
	rtmpMethodPtr
	packetizationPtr
	quantizationModePtr
	verbosityPtr
	framesPerClipPtr
	rtmpUrlPtr
	bitratePtr
	outputFileNamePtr
	inputFileNamePtr
	heightPtr
	widthPtr
	frameRatePtr
	httpAddressPtr
	quantizationPtr
	timeoutPtr
	intraRefreshPeriodPtr
	verticalFlipPtr
	horizontalFlipPtr

	noOfConfigFlags
)

// Other misc consts
const (
	netSendRetryTime   = 5 * time.Second
	defaultRunDuration = 24 * time.Hour
	revidStopTime      = 5 * time.Second
	prepTime           = 20 * time.Second
)

const (
	cpuUsage     = 20
	cpuTemp      = 21
	revidBitrate = 23
)

// Globals
var (
	revidInst *revid.Revid
	config    revid.Config
)

func main() {
	flagNames := [noOfConfigFlags]struct{ name, description 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"},
		{"VerticalFlip", "Flip video vertically"},
		{"HorizontalFlip", "Flip video horizontally"},
	}

	// Create the configFlags based on the flagNames array
	configFlags := make([](*string), noOfConfigFlags)
	for i, f := range &flagNames {
		configFlags[i] = flag.String(f.name, "", f.description)
	}

	// Do we want a netsender session
	useNetsender := flag.Bool("NetSender", false, "Are we checking vars through netsender?")
	// User might also want to define how long revid runs for
	runDurationPtr := flag.Duration("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!")
	}

	switch *configFlags[horizontalFlipPtr] {
	case "No":
		config.HorizontalFlip = revid.No
	case "Yes":
		config.HorizontalFlip = revid.Yes
	case "":
		config.HorizontalFlip = revid.No
	default:
		fmt.Println("Bad horizontal flip option!")
	}

	switch *configFlags[verticalFlipPtr] {
	case "No":
		config.VerticalFlip = revid.No
	case "Yes":
		config.VerticalFlip = revid.Yes
	case "":
		config.VerticalFlip = revid.No
	default:
		fmt.Println("Bad vertical flip option!")
	}

	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]

	var ns netsender.Netsender
	var vs int
	if *useNetsender {
		// initialize NetSender and use NetSender's logger
		config.Logger = netsender.GetLogger()

		var err error
		ns, err = netsender.NewNetsender(false, revidReportActions)
		if err != nil {
			l := smartlogger.New(loggerVerbosity, smartlogger.File, "/var/log/netsender/")
			l.Log(progName, "Error", err.Error()) // TODO(kortschak): Make this "Fatal" when that exists.
			os.Exit(1)
		}

		vs = ns.GetVarSum()
	} else {
		// alternatively, instantiate our own logger
		config.Logger = smartlogger.New(loggerVerbosity, smartlogger.File, "/var/log/netsender/")
	}

	time.Sleep(prepTime)
	startRevid()
	paused := false

	// loop in NetSender mode
	for *useNetsender {
		if err := sendTo(ns); err != nil {
			config.Logger.Log(progName, "Error", err.Error())
			time.Sleep(netSendRetryTime)
			continue
		}

		if vs != ns.GetVarSum() {
			// vars changed
			vars, err := ns.GetVars()
			if err != nil {
				config.Logger.Log(progName, "Error", err.Error())
				time.Sleep(netSendRetryTime)
				continue
			}
			vs = ns.GetVarSum()
			if vars["mode"] == "Paused" {
				if !paused {
					config.Logger.Log(progName, "Info", "Pausing revid")
					stopRevid()
					paused = true
				}
			} else {
				updateRevid(vars, !paused)
				if paused {
					paused = false
				}
			}
		}
		sleepTime, _ := strconv.Atoi(ns.GetConfigParam("mp"))
		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(*runDurationPtr)
	stopRevid()
}

// sendTo handles NetReceiver configuration and sends requested data to the cloud.
func sendTo(ns netsender.Netsender) error {
	if !ns.IsConfigured() {
		err := ns.Config()
		if err != nil {
			return err
		}
	}

	inputs := strings.Split(ns.GetConfigParam("ip"), ",")
	_, reconfig, err := ns.Send(netsender.RequestPoll, inputs)
	if err != nil {
		return err
	}
	if reconfig {
		return ns.Config()
	}
	return nil
}

// wrappers for stopping and starting revid
func startRevid() {
	createRevidInstance()
	revidInst.Start()
}

func createRevidInstance() {
	// Try to create the revid instance with the given config
	var err error
	for revidInst, err = revid.New(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(progName, "FATAL ERROR", err.Error())
		} else {
			fmt.Printf("FATAL ERROR: %v", err.Error())
		}
	}
}

func stopRevid() {
	revidInst.Stop()

	// FIXME(kortschak): Is this waiting on completion of work?
	// Use a wait group and Wait method if it is.
	time.Sleep(revidStopTime)
}

func updateRevid(vars map[string]string, stop bool) {
	if stop {
		stopRevid()
	}

	//look through the vars and update revid where needed
	for key, value := range vars {
		switch key {
		case "FramesPerClip":
			asInt, err := strconv.Atoi(value)
			if asInt > 0 && err == nil {
				config.FramesPerClip = value
			}
		case "RtmpUrl":
			config.RtmpUrl = value
		case "Bitrate":
			revidInst.Log(revid.Debug, fmt.Sprintf("The value: %v", value))
			asInt, err := strconv.Atoi(value)
			revidInst.Log(revid.Debug, fmt.Sprintf("Bitrate as integer: %v", asInt))
			if asInt > 0 && err == nil {
				revidInst.Log(revid.Debug, "Updating bitrate")
				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
			}
		case "HorizontalFlip":
			switch value {
			case "Yes":
				config.HorizontalFlip = revid.Yes
			case "No":
				config.HorizontalFlip = revid.No
			}
		case "VerticalFlip":
			switch value {
			case "Yes":
				config.VerticalFlip = revid.Yes
			case "No":
				config.VerticalFlip = revid.No
			}
		}
	}

	startRevid()
}

func revidReportActions(pin int) (int, error) {
	switch {

	//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 * 1000)

		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 == revidBitrate:
		return int(revidInst.GetBitrate()), nil

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