package revid

// Config provides parameters relevant to a revid instance. A new config must
// be passed to the constructor.
type Config struct {
	Input              uint8
	InputCodec         uint8
	Output             uint8
	RtmpEncodingMethod uint8
	FramesPerClip uint
	RtmpUrl            string
	Bitrate            string
	OutputFileName     string
	InputFileName      string
	Height             string
	Width              string
	FrameRate          string
	HttpAddress        string
	Quantization       string
	Timeout            string
	Packetization      uint8
	IntraRefreshPeriod string
	Logger             smartLogger.LogInstance
}

// Enums for config struct
const (
	NothingDefined = 0
	Raspivid       = 1
	Rtp            = 2
	H264Codec      = 3
	File           = 4
	HttpOut        = 5
	H264           = 6
	Mjpeg          = 7
	None           = 8
	Mpegts         = 9
	Rtmp           = 10
	Ffmpeg         = 11
	Revid          = 12
	Flv = 13
)

// Default config settings
const (
	defaultFrameRate          = "25"
	defaultWidth              = "1280"
	defaultHeight             = "720"
	defaultIntraRefreshPeriod = "100"
	defaultTimeout            = "0"
	defaultQuantization       = "35"
	defaultBitrate            = "0"
)

// checkConfig checks for any errors in the config files and defaults settings
// if particular parameters have not been defined.
func (config *Config) Validate(r *revidInst) error {
	switch config.Input {
	case Rtp:
	case Raspivid:
	case File:
	case NothingDefined:
		r.Log(Warning, "No input type defined, defaulting to raspivid!")
		config.Input = Raspivid
	default:
		return errors.New("Bad input type defined in config!")
	}

	switch config.InputCodec {
	case H264:
		if config.Bitrate != "" && config.Quantization != "" {
			bitrate, _ := strconv.Atoi(config.Bitrate)
			quantization, _ := strconv.Atoi(config.Quantization)
			if (bitrate > 0 && quantization > 0) || (bitrate == 0 && quantization == 0) {
				return errors.New("Bad bitrate and quantization combination for H264 input!")
			}
		}
	case Mjpeg:
		if config.Quantization != "" {
			quantization, _ := strconv.Atoi(config.Quantization)
			if quantization > 0 || config.Bitrate == "" {
				return errors.New("Bad bitrate or quantization for mjpeg input!")
			}
		}
	case NothingDefined:
		r.Log(Warning, "No input codec defined, defaulting to h264!")
		config.InputCodec = H264
		r.Log(Warning, "Defaulting bitrate to 0 and quantization to 35!")
		config.Bitrate = defaultBitrate
		config.Quantization = defaultQuantization
	default:
		return errors.New("Bad input codec defined in config!")
	}

	switch config.Output {
	case HttpOut:
	case File:
	case Rtmp:
		switch config.RtmpEncodingMethod {
		case Revid:
		case Ffmpeg:
		case NothingDefined:
			r.Log(Warning, "No RTMP encoding method defined, defautling to ffmpeg!")
			config.RtmpEncodingMethod = Ffmpeg
		}
		if config.RtmpUrl == "" {
			return errors.New("Bad RTMP URL")
		}
	case NothingDefined:
		r.Log(Warning, "No output defined, defaulting to httpOut!")
		config.Output = HttpOut
	default:
		return errors.New("Bad output type defined in config!")
	}

	switch config.Packetization {
	case None:
	case Mpegts:
	case NothingDefined:
		r.Log(Warning, "No packetization option defined, defaulting to none!")
		config.Packetization = None
	default:
		return errors.New("Bad packetization option defined in config!")
	}

	switch {
	case config.FramesPerClip > 0:
	case config.FramesPerClip == 0:
		r.Log(Warning, "No frames per clip defined, defaulting to 1!")
		config.FramesPerClip = 1
	case config.FramesPerClip < 0:
		return errors.New("Bad frames per clip given!")
	}

	if config.Width == "" {
		r.Log(Warning, "No width defined, defaulting to 1280!")
		config.Width = defaultWidth
	} else {
		if integer, err := strconv.Atoi(config.Width); integer < 0 || err != nil {
			return errors.New("Bad width defined in config!")
		}
	}

	if config.Height == "" {
		r.Log(Warning, "No height defined, defaulting to 720!")
		config.Height = defaultHeight
	} else {
		if integer, err := strconv.Atoi(config.Height); integer < 0 || err != nil {
			return errors.New("Bad height defined in config!")
		}
	}

	if config.FrameRate == "" {
		r.Log(Warning, "No frame rate defined, defaulting to 25!")
		config.FrameRate = defaultFrameRate
	} else {
		if integer, err := strconv.Atoi(config.FrameRate); integer < 0 || err != nil {
			return errors.New("Bad frame rate defined in config!")
		}
	}

	if config.Timeout == "" {
		r.Log(Warning, "No timeout defined, defaulting to 0!")
		config.Timeout = defaultTimeout
	} else {
		if integer, err := strconv.Atoi(config.Timeout); integer < 0 || err != nil {
			return errors.New("Bad timeout defined in config!")
		}
	}

	if config.IntraRefreshPeriod == "" {
		r.Log(Warning, "No intra refresh defined, defaulting to 100!")
		config.IntraRefreshPeriod = defaultIntraRefreshPeriod
	} else {
		if integer, err := strconv.Atoi(config.IntraRefreshPeriod); integer < 0 || err != nil {
			return errors.New("Bad intra refresh defined in config!")
		}
	}

	if config.Quantization == "" {
		r.Log(Warning, "No quantization defined, defaulting to 35!")
		config.Quantization = defaultQuantization
	} else {
		if integer, err := strconv.Atoi(config.Quantization); integer < 0 || integer > 51 || err != nil {
			return errors.New("Bad quantization defined in config!")
		}
	}
}