/*
DESCRIPTION
  variables.go contains a list of structs that provide a variable Name, type in
  a string format, a function for updating the variable in the Config struct
  from a string, and finally, a validation function to check the validity of the
  corresponding field value in the Config.

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

LICENSE
  Copyright (C) 2020 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 http://www.gnu.org/licenses.
*/

package config

import (
	"fmt"
	"strconv"
	"strings"
	"time"

	"bitbucket.org/ausocean/av/codec/codecutil"
	"bitbucket.org/ausocean/utils/logger"
)

// Default variable values.
const (
	// General revid defaults.
	defaultInput           = InputRaspivid
	defaultOutput          = OutputHTTP
	defaultInputCodec      = codecutil.H264
	defaultVerbosity       = logger.Error
	defaultRTPAddr         = "localhost:6970"
	defaultCameraIP        = "192.168.1.50"
	defaultBurstPeriod     = 10 // Seconds
	defaultMinFrames       = 100
	defaultFrameRate       = 25
	defaultWriteRate       = 25
	defaultClipDuration    = 0
	defaultAudioInputCodec = codecutil.ADPCM
	defaultPSITime         = 2
	defaultFileFPS         = 0

	// Ring buffer defaults.
	defaultRBCapacity     = 50000000 // => 50MB
	defaultRBWriteTimeout = 5        // Seconds.

	// Motion filter parameter defaults.
	defaultMinFPS = 1.0
)

var Variables = []struct {
	Name     string
	Type_    string
	Update   func(*Config, string)
	Validate func(*Config)
}{
	{
		Name:   "AutoWhiteBalance",
		Type_:  "enum:off,auto,sun,cloud,shade,tungsten,fluorescent,incandescent,flash,horizon",
		Update: func(c *Config, v string) { c.AutoWhiteBalance = v },
	},
	{
		Name:   "BitDepth",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.BitDepth = parseUint("BitDepth", v, c) },
	},
	{
		Name:   "Bitrate",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.Bitrate = parseUint("Bitrate", v, c) },
	},
	{
		Name:   "Brightness",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.Brightness = parseUint("Brightness", v, c) },
	},
	{
		Name:   "BurstPeriod",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.BurstPeriod = parseUint("BurstPeriod", v, c) },
		Validate: func(c *Config) {
			if c.BurstPeriod <= 0 {
				c.LogInvalidField("BurstPeriod", defaultBurstPeriod)
				c.BurstPeriod = defaultBurstPeriod
			}
		},
	},
	{
		Name:   "CameraChan",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.CameraChan = uint8(parseUint("CameraChan", v, c)) },
	},
	{
		Name:   "CameraIP",
		Type_:  "string",
		Update: func(c *Config, v string) { c.CameraIP = v },
		Validate: func(c *Config) {
			if c.CameraIP == "" {
				c.LogInvalidField("CameraIP", defaultCameraIP)
				c.CameraIP = defaultCameraIP
			}
		},
	},
	{
		Name:   "CBR",
		Type_:  "bool",
		Update: func(c *Config, v string) { c.CBR = parseBool("CBR", v, c) },
	},
	{
		Name:  "ClipDuration",
		Type_: "uint",
		Update: func(c *Config, v string) {
			_v, err := strconv.Atoi(v)
			if err != nil {
				c.Logger.Log(logger.Warning, "invalid ClipDuration param", "value", v)
			}
			c.ClipDuration = time.Duration(_v) * time.Second
		},
		Validate: func(c *Config) {
			if c.ClipDuration <= 0 {
				c.LogInvalidField("ClipDuration", defaultClipDuration)
				c.ClipDuration = defaultClipDuration
			}
		},
	},
	{
		Name:   "Exposure",
		Type_:  "enum:auto,night,nightpreview,backlight,spotlight,sports,snow,beach,verylong,fixedfps,antishake,fireworks",
		Update: func(c *Config, v string) { c.Exposure = v },
	},
	{
		Name:   "FileFPS",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.FileFPS = parseUint("FileFPS", v, c) },
		Validate: func(c *Config) {
			if c.FileFPS <= 0 || (c.FileFPS > 0 && c.Input != InputFile) {
				c.LogInvalidField("FileFPS", defaultFileFPS)
				c.FileFPS = defaultFileFPS
			}
		},
	},
	{
		Name:  "Filters",
		Type_: "enums:NoOp,MOG,VariableFPS,KNN,Difference,Basic",
		Update: func(c *Config, v string) {
			filters := strings.Split(v, ",")
			m := map[string]uint{"NoOp": FilterNoOp, "MOG": FilterMOG, "VariableFPS": FilterVariableFPS, "KNN": FilterKNN, "Difference": FilterDiff, "Basic": FilterBasic}
			c.Filters = make([]uint, len(filters))
			for i, filter := range filters {
				v, ok := m[filter]
				if !ok {
					c.Logger.Log(logger.Warning, "invalid Filters param", "value", v)
				}
				c.Filters[i] = uint(v)
			}
		},
	},
	{
		Name:   "FrameRate",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.FrameRate = parseUint("FrameRate", v, c) },
		Validate: func(c *Config) {
			if c.FrameRate <= 0 || c.FrameRate > 60 {
				c.LogInvalidField("FrameRate", defaultFrameRate)
				c.FrameRate = defaultFrameRate
			}
		},
	},
	{
		Name:   "Height",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.Height = parseUint("Height", v, c) },
	},
	{
		Name:   "HorizontalFlip",
		Type_:  "bool",
		Update: func(c *Config, v string) { c.HorizontalFlip = parseBool("HorizontalFlip", v, c) },
	},
	{
		Name:   "HTTPAddress",
		Type_:  "string",
		Update: func(c *Config, v string) { c.HTTPAddress = v },
	},
	{
		Name:  "Input",
		Type_: "enum:raspivid,rtsp,v4l,file,audio",
		Update: func(c *Config, v string) {
			c.Input = parseEnum(
				"Input",
				v,
				map[string]uint8{
					"raspivid": InputRaspivid,
					"rtsp":     InputRTSP,
					"v4l":      InputV4L,
					"file":     InputFile,
					"audio":    InputAudio,
				},
				c,
			)
		},
		Validate: func(c *Config) {
			switch c.Input {
			case InputRaspivid, InputV4L, InputFile, InputAudio, InputRTSP:
			default:
				c.LogInvalidField("Input", defaultInput)
				c.Input = defaultInput
			}
		},
	},
	{
		Name:  "InputCodec",
		Type_: "enum:H264,H265,MJPEG,PCM,ADPCM",
		Update: func(c *Config, v string) {
			c.InputCodec = parseEnum(
				"InputCodec",
				v,
				map[string]uint8{
					"h264":  codecutil.H264,
					"h265":  codecutil.H265,
					"mjpeg": codecutil.MJPEG,
					"pcm":   codecutil.PCM,
					"adpcm": codecutil.ADPCM,
				},
				c,
			)
		},
		Validate: func(c *Config) {
			switch c.InputCodec {
			case codecutil.H264, codecutil.MJPEG, codecutil.PCM, codecutil.ADPCM:
			default:
				switch c.Input {
				case OutputAudio:
					c.LogInvalidField("InputCodec", defaultAudioInputCodec)
					c.InputCodec = defaultAudioInputCodec
				default:
					c.LogInvalidField("InputCodec", defaultInputCodec)
					c.InputCodec = defaultInputCodec
				}
			}
		},
	},
	{
		Name:   "InputPath",
		Type_:  "string",
		Update: func(c *Config, v string) { c.InputPath = v },
	},
	{
		Name:  "logging",
		Type_: "enum:Debug,Info,Warning,Error,Fatal",
		Update: func(c *Config, v string) {
			switch v {
			case "Debug":
				c.LogLevel = logger.Debug
			case "Info":
				c.LogLevel = logger.Info
			case "Warning":
				c.LogLevel = logger.Warning
			case "Error":
				c.LogLevel = logger.Error
			case "Fatal":
				c.LogLevel = logger.Fatal
			default:
				c.Logger.Log(logger.Warning, "invalid Logging param", "value", v)
			}
		},
		Validate: func(c *Config) {
			switch c.LogLevel {
			case logger.Debug, logger.Info, logger.Warning, logger.Error, logger.Fatal:
			default:
				c.LogInvalidField("LogLevel", defaultVerbosity)
				c.LogLevel = defaultVerbosity
			}
		},
	},
	{
		Name:   "Loop",
		Type_:  "bool",
		Update: func(c *Config, v string) { c.Loop = parseBool("Loop", v, c) },
	},
	{
		Name:     "MinFPS",
		Type_:    "uint",
		Update:   func(c *Config, v string) { c.MinFPS = parseUint("MinFPS", v, c) },
		Validate: func(c *Config) { c.MinFPS = lessThanOrEqual("MinFPS", c.MinFPS, 0, c, defaultMinFPS) },
	},
	{
		Name:   "MinFrames",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.MinFrames = parseUint("MinFrames", v, c) },
		Validate: func(c *Config) {
			const maxMinFrames = 1000
			if c.MinFrames <= 0 || c.MinFrames > maxMinFrames {
				c.LogInvalidField("MinFrames", defaultMinFrames)
				c.MinFrames = defaultMinFrames
			}
		},
	},
	{
		Name:  "mode",
		Type_: "enum:Normal,Paused,Burst,Loop",
		Update: func(c *Config, v string) {
			c.Loop = false
			if v == "Loop" {
				c.Loop = true
			}
		},
	},
	{
		Name:   "MotionDownscaling",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.MotionDownscaling = parseUint("MotionDownscaling", v, c) },
	},
	{
		Name:   "MotionHistory",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.MotionHistory = parseUint("MotionHistory", v, c) },
	},
	{
		Name:   "MotionInterval",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.MotionInterval = parseUint("MotionInterval", v, c) },
	},
	{
		Name:   "MotionKernel",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.MotionKernel = parseUint("MotionKernel", v, c) },
	},
	{
		Name:  "MotionMinArea",
		Type_: "float",
		Update: func(c *Config, v string) {
			f, err := strconv.ParseFloat(v, 64)
			if err != nil {
				c.Logger.Log(logger.Warning, "invalid MotionMinArea var", "value", v)
			}
			c.MotionMinArea = f
		},
	},
	{
		Name:   "MotionPadding",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.MotionPadding = parseUint("MotionPadding", v, c) },
	},
	{
		Name:   "MotionPixels",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.MotionPixels = parseUint("MotionPixels", v, c) },
	},
	{
		Name:  "MotionThreshold",
		Type_: "float",
		Update: func(c *Config, v string) {
			f, err := strconv.ParseFloat(v, 64)
			if err != nil {
				c.Logger.Log(logger.Warning, "invalid MotionThreshold var", "value", v)
			}
			c.MotionThreshold = f
		},
	},
	{
		Name:  "Output",
		Type_: "enum:File,HTTP,RTMP,RTP",
		Update: func(c *Config, v string) {
			c.Outputs = make([]uint8, 1)
			switch strings.ToLower(v) {
			case "file":
				c.Outputs[0] = OutputFile
			case "http":
				c.Outputs[0] = OutputHTTP
			case "rtmp":
				c.Outputs[0] = OutputRTMP
			case "rtp":
				c.Outputs[0] = OutputRTP
			default:
				c.Logger.Log(logger.Warning, "invalid output param", "value", v)
			}
		},
	},
	{
		Name:   "OutputPath",
		Type_:  "string",
		Update: func(c *Config, v string) { c.OutputPath = v },
	},
	{
		Name:  "Outputs",
		Type_: "enums:File,HTTP,RTMP,RTP",
		Update: func(c *Config, v string) {
			outputs := strings.Split(v, ",")
			c.Outputs = make([]uint8, len(outputs))
			for i, output := range outputs {
				switch strings.ToLower(output) {
				case "file":
					c.Outputs[i] = OutputFile
				case "http":
					c.Outputs[i] = OutputHTTP
				case "rtmp":
					c.Outputs[i] = OutputRTMP
				case "rtp":
					c.Outputs[i] = OutputRTP
				default:
					c.Logger.Log(logger.Warning, "invalid outputs param", "value", v)
				}
			}
		},
		Validate: func(c *Config) {
			if c.Outputs == nil {
				c.LogInvalidField("Outputs", defaultOutput)
				c.Outputs = append(c.Outputs, defaultOutput)
			}
		},
	},
	{
		Name:     "PSITime",
		Type_:    "uint",
		Update:   func(c *Config, v string) { c.PSITime = parseUint("PSITime", v, c) },
		Validate: func(c *Config) { c.PSITime = lessThanOrEqual("PSITime", c.PSITime, 0, c, defaultPSITime) },
	},
	{
		Name:   "Quantization",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.Quantization = parseUint("Quantization", v, c) },
	},
	{
		Name:     "RBCapacity",
		Type_:    "uint",
		Update:   func(c *Config, v string) { c.RBCapacity = parseUint("RBCapacity", v, c) },
		Validate: func(c *Config) { c.RBCapacity = lessThanOrEqual("RBCapacity", c.RBCapacity, 0, c, defaultRBCapacity) },
	},
	{
		Name:   "RBWriteTimeout",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.RBWriteTimeout = parseUint("RBWriteTimeout", v, c) },
		Validate: func(c *Config) {
			c.RBWriteTimeout = lessThanOrEqual("RBWriteTimeout", c.RBWriteTimeout, 0, c, defaultRBWriteTimeout)
		},
	},
	{
		Name:   "Rotation",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.Rotation = parseUint("Rotation", v, c) },
	},
	{
		Name:   "RTMPURL",
		Type_:  "string",
		Update: func(c *Config, v string) { c.RTMPURL = v },
	},
	{
		Name:   "RTPAddress",
		Type_:  "string",
		Update: func(c *Config, v string) { c.RTPAddress = v },
		Validate: func(c *Config) {
			if c.RTPAddress == "" {
				c.LogInvalidField("RTPAddress", defaultRTPAddr)
				c.RTPAddress = defaultRTPAddr
			}
		},
	},
	{
		Name:  "Saturation",
		Type_: "int",
		Update: func(c *Config, v string) {
			_v, err := strconv.Atoi(v)
			if err != nil {
				c.Logger.Log(logger.Warning, "invalid saturation param", "value", v)
			}
			c.Saturation = _v
		},
	},
	{
		Name:  "Suppress",
		Type_: "bool",
		Update: func(c *Config, v string) {
			c.Suppress = parseBool("Suppress", v, c)
			c.Logger.(*logger.Logger).SetSuppress(c.Suppress)
		},
	},
	{
		Name:   "VBRBitrate",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.VBRBitrate = parseUint("VBRBitrate", v, c) },
	},
	{
		Name:  "VBRQuality",
		Type_: "enum:standard,fair,good,great,excellent",
		Update: func(c *Config, v string) {
			c.VBRQuality = Quality(parseEnum(
				"VBRQuality",
				v,
				map[string]uint8{
					"standard":  uint8(QualityStandard),
					"fair":      uint8(QualityFair),
					"good":      uint8(QualityGood),
					"great":     uint8(QualityGreat),
					"excellent": uint8(QualityExcellent),
				},
				c,
			))
		},
	},
	{
		Name:   "VerticalFlip",
		Type_:  "bool",
		Update: func(c *Config, v string) { c.VerticalFlip = parseBool("VerticalFlip", v, c) },
	},
	{
		Name:   "Width",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.Width = parseUint("Width", v, c) },
	},
	{
		Name:   "WriteRate",
		Type_:  "uint",
		Update: func(c *Config, v string) { c.WriteRate = float64(parseUint("WriteRate", v, c)) },
		Validate: func(c *Config) {
			c.WriteRate = float64(lessThanOrEqual("WriteRate", uint(c.WriteRate), 0, c, defaultWriteRate))
		},
	},
}

func parseUint(n, v string, c *Config) uint {
	_v, err := strconv.Atoi(v)
	if err != nil {
		c.Logger.Log(logger.Warning, fmt.Sprintf("invalid %s param", n), "value", v)
	}
	return uint(_v)
}

func parseBool(n, v string, c *Config) (b bool) {
	switch strings.ToLower(v) {
	case "true":
		b = true
	case "false":
		b = false
	default:
		c.Logger.Log(logger.Warning, fmt.Sprintf("invalid value for %s param", n), "value", v)
	}
	return
}

func parseEnum(n, v string, enums map[string]uint8, c *Config) uint8 {
	_v, ok := enums[strings.ToLower(v)]
	if !ok {
		c.Logger.Log(logger.Warning, fmt.Sprintf("invalid value for %s param", n), "value", v)
	}
	return _v
}

func lessThanOrEqual(n string, v, cmp uint, c *Config, def uint) uint {
	if v <= cmp {
		c.LogInvalidField(n, def)
		return def
	}
	return v
}