package config

import (
	"os"
	"strings"

	"github.com/pion/webrtc/v3"
	"github.com/rs/zerolog/log"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"

	"github.com/demodesk/neko/pkg/types"
	"github.com/demodesk/neko/pkg/types/codec"
	"github.com/demodesk/neko/pkg/utils"
)

// Legacy capture configuration
type HwEnc int

// Legacy capture configuration
const (
	HwEncUnset HwEnc = iota
	HwEncNone
	HwEncVAAPI
	HwEncNVENC
)

type Capture struct {
	Display string

	VideoCodec     codec.RTPCodec
	VideoIDs       []string
	VideoPipelines map[string]types.VideoConfig

	AudioDevice   string
	AudioCodec    codec.RTPCodec
	AudioPipeline string

	BroadcastAudioBitrate int
	BroadcastVideoBitrate int
	BroadcastPreset       string
	BroadcastPipeline     string
	BroadcastUrl          string
	BroadcastAutostart    bool

	ScreencastEnabled  bool
	ScreencastRate     string
	ScreencastQuality  string
	ScreencastPipeline string

	WebcamEnabled bool
	WebcamDevice  string
	WebcamWidth   int
	WebcamHeight  int

	MicrophoneEnabled bool
	MicrophoneDevice  string
}

func (Capture) Init(cmd *cobra.Command) error {
	// audio
	cmd.PersistentFlags().String("capture.audio.device", "audio_output.monitor", "pulseaudio device to capture")
	if err := viper.BindPFlag("capture.audio.device", cmd.PersistentFlags().Lookup("capture.audio.device")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("capture.audio.codec", "opus", "audio codec to be used")
	if err := viper.BindPFlag("capture.audio.codec", cmd.PersistentFlags().Lookup("capture.audio.codec")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("capture.audio.pipeline", "", "gstreamer pipeline used for audio streaming")
	if err := viper.BindPFlag("capture.audio.pipeline", cmd.PersistentFlags().Lookup("capture.audio.pipeline")); err != nil {
		return err
	}

	// videos
	cmd.PersistentFlags().String("capture.video.display", "", "X display to capture")
	if err := viper.BindPFlag("capture.video.display", cmd.PersistentFlags().Lookup("capture.video.display")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("capture.video.codec", "vp8", "video codec to be used")
	if err := viper.BindPFlag("capture.video.codec", cmd.PersistentFlags().Lookup("capture.video.codec")); err != nil {
		return err
	}

	cmd.PersistentFlags().StringSlice("capture.video.ids", []string{}, "ordered list of video ids")
	if err := viper.BindPFlag("capture.video.ids", cmd.PersistentFlags().Lookup("capture.video.ids")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("capture.video.pipelines", "[]", "pipelines config in JSON used for video streaming")
	if err := viper.BindPFlag("capture.video.pipelines", cmd.PersistentFlags().Lookup("capture.video.pipelines")); err != nil {
		return err
	}

	// broadcast
	cmd.PersistentFlags().Int("capture.broadcast.audio_bitrate", 128, "broadcast audio bitrate in KB/s")
	if err := viper.BindPFlag("capture.broadcast.audio_bitrate", cmd.PersistentFlags().Lookup("capture.broadcast.audio_bitrate")); err != nil {
		return err
	}

	cmd.PersistentFlags().Int("capture.broadcast.video_bitrate", 4096, "broadcast video bitrate in KB/s")
	if err := viper.BindPFlag("capture.broadcast.video_bitrate", cmd.PersistentFlags().Lookup("capture.broadcast.video_bitrate")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("capture.broadcast.preset", "veryfast", "broadcast speed preset for h264 encoding")
	if err := viper.BindPFlag("capture.broadcast.preset", cmd.PersistentFlags().Lookup("capture.broadcast.preset")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("capture.broadcast.pipeline", "", "gstreamer pipeline used for broadcasting")
	if err := viper.BindPFlag("capture.broadcast.pipeline", cmd.PersistentFlags().Lookup("capture.broadcast.pipeline")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("capture.broadcast.url", "", "initial URL for broadcasting, setting this value will automatically start broadcasting")
	if err := viper.BindPFlag("capture.broadcast.url", cmd.PersistentFlags().Lookup("capture.broadcast.url")); err != nil {
		return err
	}

	cmd.PersistentFlags().Bool("capture.broadcast.autostart", true, "automatically start broadcasting when neko starts and broadcast_url is set")
	if err := viper.BindPFlag("capture.broadcast.autostart", cmd.PersistentFlags().Lookup("capture.broadcast.autostart")); err != nil {
		return err
	}

	// screencast
	cmd.PersistentFlags().Bool("capture.screencast.enabled", false, "enable screencast")
	if err := viper.BindPFlag("capture.screencast.enabled", cmd.PersistentFlags().Lookup("capture.screencast.enabled")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("capture.screencast.rate", "10/1", "screencast frame rate")
	if err := viper.BindPFlag("capture.screencast.rate", cmd.PersistentFlags().Lookup("capture.screencast.rate")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("capture.screencast.quality", "60", "screencast JPEG quality")
	if err := viper.BindPFlag("capture.screencast.quality", cmd.PersistentFlags().Lookup("capture.screencast.quality")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("capture.screencast.pipeline", "", "gstreamer pipeline used for screencasting")
	if err := viper.BindPFlag("capture.screencast.pipeline", cmd.PersistentFlags().Lookup("capture.screencast.pipeline")); err != nil {
		return err
	}

	// webcam
	cmd.PersistentFlags().Bool("capture.webcam.enabled", false, "enable webcam stream")
	if err := viper.BindPFlag("capture.webcam.enabled", cmd.PersistentFlags().Lookup("capture.webcam.enabled")); err != nil {
		return err
	}

	// sudo apt install v4l2loopback-dkms v4l2loopback-utils
	// sudo apt-get install linux-headers-`uname -r` linux-modules-extra-`uname -r`
	// sudo modprobe v4l2loopback exclusive_caps=1
	cmd.PersistentFlags().String("capture.webcam.device", "/dev/video0", "v4l2sink device used for webcam")
	if err := viper.BindPFlag("capture.webcam.device", cmd.PersistentFlags().Lookup("capture.webcam.device")); err != nil {
		return err
	}

	cmd.PersistentFlags().Int("capture.webcam.width", 1280, "webcam stream width")
	if err := viper.BindPFlag("capture.webcam.width", cmd.PersistentFlags().Lookup("capture.webcam.width")); err != nil {
		return err
	}

	cmd.PersistentFlags().Int("capture.webcam.height", 720, "webcam stream height")
	if err := viper.BindPFlag("capture.webcam.height", cmd.PersistentFlags().Lookup("capture.webcam.height")); err != nil {
		return err
	}

	// microphone
	cmd.PersistentFlags().Bool("capture.microphone.enabled", true, "enable microphone stream")
	if err := viper.BindPFlag("capture.microphone.enabled", cmd.PersistentFlags().Lookup("capture.microphone.enabled")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("capture.microphone.device", "audio_input", "pulseaudio device used for microphone")
	if err := viper.BindPFlag("capture.microphone.device", cmd.PersistentFlags().Lookup("capture.microphone.device")); err != nil {
		return err
	}

	return nil
}

func (Capture) InitV2(cmd *cobra.Command) error {
	cmd.PersistentFlags().String("display", "", "V2: XDisplay to capture")
	if err := viper.BindPFlag("display", cmd.PersistentFlags().Lookup("display")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("video_codec", "", "V2: video codec to be used")
	if err := viper.BindPFlag("video_codec", cmd.PersistentFlags().Lookup("video_codec")); err != nil {
		return err
	}

	// DEPRECATED: video codec
	cmd.PersistentFlags().Bool("vp8", false, "DEPRECATED: use video_codec")
	if err := viper.BindPFlag("vp8", cmd.PersistentFlags().Lookup("vp8")); err != nil {
		return err
	}

	// DEPRECATED: video codec
	cmd.PersistentFlags().Bool("vp9", false, "DEPRECATED: use video_codec")
	if err := viper.BindPFlag("vp9", cmd.PersistentFlags().Lookup("vp9")); err != nil {
		return err
	}

	// DEPRECATED: video codec
	cmd.PersistentFlags().Bool("av1", false, "DEPRECATED: use video_codec")
	if err := viper.BindPFlag("av1", cmd.PersistentFlags().Lookup("av1")); err != nil {
		return err
	}

	// DEPRECATED: video codec
	cmd.PersistentFlags().Bool("h264", false, "DEPRECATED: use video_codec")
	if err := viper.BindPFlag("h264", cmd.PersistentFlags().Lookup("h264")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("hwenc", "", "V2: use hardware accelerated encoding")
	if err := viper.BindPFlag("hwenc", cmd.PersistentFlags().Lookup("hwenc")); err != nil {
		return err
	}

	cmd.PersistentFlags().Int("video_bitrate", 0, "V2: video bitrate in kbit/s")
	if err := viper.BindPFlag("video_bitrate", cmd.PersistentFlags().Lookup("video_bitrate")); err != nil {
		return err
	}

	cmd.PersistentFlags().Int("max_fps", 0, "V2: maximum fps delivered via WebRTC, 0 is for no maximum")
	if err := viper.BindPFlag("max_fps", cmd.PersistentFlags().Lookup("max_fps")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("video", "", "V2: video codec parameters to use for streaming")
	if err := viper.BindPFlag("video", cmd.PersistentFlags().Lookup("video")); err != nil {
		return err
	}

	//
	// audio
	//

	cmd.PersistentFlags().String("device", "", "V2: audio device to capture")
	if err := viper.BindPFlag("device", cmd.PersistentFlags().Lookup("device")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("audio_codec", "", "V2: audio codec to be used")
	if err := viper.BindPFlag("audio_codec", cmd.PersistentFlags().Lookup("audio_codec")); err != nil {
		return err
	}

	// DEPRECATED: audio codec
	cmd.PersistentFlags().Bool("opus", false, "DEPRECATED: use audio_codec")
	if err := viper.BindPFlag("opus", cmd.PersistentFlags().Lookup("opus")); err != nil {
		return err
	}

	// DEPRECATED: audio codec
	cmd.PersistentFlags().Bool("g722", false, "DEPRECATED: use audio_codec")
	if err := viper.BindPFlag("g722", cmd.PersistentFlags().Lookup("g722")); err != nil {
		return err
	}

	// DEPRECATED: audio codec
	cmd.PersistentFlags().Bool("pcmu", false, "DEPRECATED: use audio_codec")
	if err := viper.BindPFlag("pcmu", cmd.PersistentFlags().Lookup("pcmu")); err != nil {
		return err
	}

	// DEPRECATED: audio codec
	cmd.PersistentFlags().Bool("pcma", false, "DEPRECATED: use audio_codec")
	if err := viper.BindPFlag("pcma", cmd.PersistentFlags().Lookup("pcma")); err != nil {
		return err
	}
	// audio codecs

	cmd.PersistentFlags().Int("audio_bitrate", 0, "V2: audio bitrate in kbit/s")
	if err := viper.BindPFlag("audio_bitrate", cmd.PersistentFlags().Lookup("audio_bitrate")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("audio", "", "V2: audio codec parameters to use for streaming")
	if err := viper.BindPFlag("audio", cmd.PersistentFlags().Lookup("audio")); err != nil {
		return err
	}

	//
	// broadcast
	//

	cmd.PersistentFlags().String("broadcast_pipeline", "", "V2: custom gst pipeline used for broadcasting, strings {url} {device} {display} will be replaced")
	if err := viper.BindPFlag("broadcast_pipeline", cmd.PersistentFlags().Lookup("broadcast_pipeline")); err != nil {
		return err
	}

	cmd.PersistentFlags().String("broadcast_url", "", "V2: a default default URL for broadcast streams, can be disabled/changed later by admins in the GUI")
	if err := viper.BindPFlag("broadcast_url", cmd.PersistentFlags().Lookup("broadcast_url")); err != nil {
		return err
	}

	cmd.PersistentFlags().Bool("broadcast_autostart", false, "V2: automatically start broadcasting when neko starts and broadcast_url is set")
	if err := viper.BindPFlag("broadcast_autostart", cmd.PersistentFlags().Lookup("broadcast_autostart")); err != nil {
		return err
	}

	return nil
}

func (s *Capture) Set() {
	var ok bool

	s.Display = viper.GetString("capture.video.display")

	// Display is provided by env variable unless explicitly set
	if s.Display == "" {
		s.Display = os.Getenv("DISPLAY")
	}

	// video
	videoCodec := viper.GetString("capture.video.codec")
	s.VideoCodec, ok = codec.ParseStr(videoCodec)
	if !ok || !s.VideoCodec.IsVideo() {
		log.Warn().Str("codec", videoCodec).Msgf("unknown video codec, using Vp8")
		s.VideoCodec = codec.VP8()
	}

	s.VideoIDs = viper.GetStringSlice("capture.video.ids")
	if err := viper.UnmarshalKey("capture.video.pipelines", &s.VideoPipelines, viper.DecodeHook(
		utils.JsonStringAutoDecode(s.VideoPipelines),
	)); err != nil {
		log.Warn().Err(err).Msgf("unable to parse video pipelines")
	}

	// default video
	if len(s.VideoPipelines) == 0 {
		log.Warn().Msgf("no video pipelines specified, using defaults")

		s.VideoCodec = codec.VP8()
		s.VideoPipelines = map[string]types.VideoConfig{
			"main": {
				Fps:        "25",
				GstEncoder: "vp8enc",
				GstParams: map[string]string{
					"target-bitrate":      "round(3072 * 650)",
					"cpu-used":            "4",
					"end-usage":           "cbr",
					"threads":             "4",
					"deadline":            "1",
					"undershoot":          "95",
					"buffer-size":         "(3072 * 4)",
					"buffer-initial-size": "(3072 * 2)",
					"buffer-optimal-size": "(3072 * 3)",
					"keyframe-max-dist":   "25",
					"min-quantizer":       "4",
					"max-quantizer":       "20",
				},
			},
		}
		s.VideoIDs = []string{"main"}
	}

	// audio
	s.AudioDevice = viper.GetString("capture.audio.device")
	s.AudioPipeline = viper.GetString("capture.audio.pipeline")

	audioCodec := viper.GetString("capture.audio.codec")
	s.AudioCodec, ok = codec.ParseStr(audioCodec)
	if !ok || !s.AudioCodec.IsAudio() {
		log.Warn().Str("codec", audioCodec).Msgf("unknown audio codec, using Opus")
		s.AudioCodec = codec.Opus()
	}

	// broadcast
	s.BroadcastAudioBitrate = viper.GetInt("capture.broadcast.audio_bitrate")
	s.BroadcastVideoBitrate = viper.GetInt("capture.broadcast.video_bitrate")
	s.BroadcastPreset = viper.GetString("capture.broadcast.preset")
	s.BroadcastPipeline = viper.GetString("capture.broadcast.pipeline")
	s.BroadcastUrl = viper.GetString("capture.broadcast.url")
	s.BroadcastAutostart = viper.GetBool("capture.broadcast.autostart")

	// screencast
	s.ScreencastEnabled = viper.GetBool("capture.screencast.enabled")
	s.ScreencastRate = viper.GetString("capture.screencast.rate")
	s.ScreencastQuality = viper.GetString("capture.screencast.quality")
	s.ScreencastPipeline = viper.GetString("capture.screencast.pipeline")

	// webcam
	s.WebcamEnabled = viper.GetBool("capture.webcam.enabled")
	s.WebcamDevice = viper.GetString("capture.webcam.device")
	s.WebcamWidth = viper.GetInt("capture.webcam.width")
	s.WebcamHeight = viper.GetInt("capture.webcam.height")

	// microphone
	s.MicrophoneEnabled = viper.GetBool("capture.microphone.enabled")
	s.MicrophoneDevice = viper.GetString("capture.microphone.device")
}

func (s *Capture) SetV2() {
	var ok bool

	//
	// video
	//

	if display := viper.GetString("display"); display != "" {
		s.Display = display
		log.Warn().Msg("you are using v2 configuration 'NEKO_DISPLAY' which is deprecated, please use 'NEKO_CAPTURE_VIDEO_DISPLAY' and/or 'NEKO_DESKTOP_DISPLAY' instead, also consider using 'DISPLAY' env variable if both should be the same")
	}

	if videoCodec := viper.GetString("video_codec"); videoCodec != "" {
		s.VideoCodec, ok = codec.ParseStr(videoCodec)
		if !ok || s.VideoCodec.Type != webrtc.RTPCodecTypeVideo {
			log.Warn().Str("codec", videoCodec).Msgf("unknown video codec, using Vp8")
			s.VideoCodec = codec.VP8()
		}
		log.Warn().Msg("you are using v2 configuration 'NEKO_VIDEO_CODEC' which is deprecated, please use 'NEKO_CAPTURE_VIDEO_CODEC' instead")
	}

	if viper.GetBool("vp8") {
		s.VideoCodec = codec.VP8()
		log.Warn().Msg("you are using deprecated config setting 'NEKO_VP8=true', use 'NEKO_CAPTURE_VIDEO_CODEC=vp8' instead")
	} else if viper.GetBool("vp9") {
		s.VideoCodec = codec.VP9()
		log.Warn().Msg("you are using deprecated config setting 'NEKO_VP9=true', use 'NEKO_CAPTURE_VIDEO_CODEC=vp9' instead")
	} else if viper.GetBool("h264") {
		s.VideoCodec = codec.H264()
		log.Warn().Msg("you are using deprecated config setting 'NEKO_H264=true', use 'NEKO_CAPTURE_VIDEO_CODEC=h264' instead")
	} else if viper.GetBool("av1") {
		s.VideoCodec = codec.AV1()
		log.Warn().Msg("you are using deprecated config setting 'NEKO_AV1=true', use 'NEKO_CAPTURE_VIDEO_CODEC=av1' instead")
	}

	videoHWEnc := HwEncUnset
	if hwenc := strings.ToLower(viper.GetString("hwenc")); hwenc != "" {
		switch hwenc {
		case "none":
			videoHWEnc = HwEncNone
		case "vaapi":
			videoHWEnc = HwEncVAAPI
		case "nvenc":
			videoHWEnc = HwEncNVENC
		default:
			log.Warn().Str("hwenc", hwenc).Msgf("unknown video hw encoder, using CPU")
		}
	}

	videoBitrate := viper.GetUint("video_bitrate")
	videoMaxFPS := int16(viper.GetInt("max_fps"))
	videoPipeline := viper.GetString("video")

	// video pipeline
	if videoHWEnc != HwEncUnset || videoBitrate != 0 || videoMaxFPS != 0 || videoPipeline != "" {
		pipeline, err := NewVideoPipeline(s.VideoCodec, s.Display, videoPipeline, videoMaxFPS, videoBitrate, videoHWEnc)
		if err != nil {
			log.Warn().Err(err).Msg("unable to create video pipeline, using default")
		} else {
			s.VideoPipelines = map[string]types.VideoConfig{
				"main": {
					GstPipeline: pipeline,
				},
			}
			// TODO: add deprecated warning and proper alternative
		}
	}

	//
	// audio
	//

	if audioDevice := viper.GetString("device"); audioDevice != "" {
		s.AudioDevice = audioDevice
		log.Warn().Msg("you are using v2 configuration 'NEKO_DEVICE' which is deprecated, please use 'NEKO_CAPTURE_AUDIO_DEVICE' instead")
	}

	if audioCodec := viper.GetString("audio_codec"); audioCodec != "" {
		s.AudioCodec, ok = codec.ParseStr(audioCodec)
		if !ok || s.AudioCodec.Type != webrtc.RTPCodecTypeAudio {
			log.Warn().Str("codec", audioCodec).Msgf("unknown audio codec, using Opus")
			s.AudioCodec = codec.Opus()
		}
		log.Warn().Msg("you are using v2 configuration 'NEKO_AUDIO_CODEC' which is deprecated, please use 'NEKO_CAPTURE_AUDIO_CODEC' instead")
	}

	if viper.GetBool("opus") {
		s.AudioCodec = codec.Opus()
		log.Warn().Msg("you are using deprecated config setting 'NEKO_OPUS=true', use 'NEKO_CAPTURE_AUDIO_CODEC=opus' instead")
	} else if viper.GetBool("g722") {
		s.AudioCodec = codec.G722()
		log.Warn().Msg("you are using deprecated config setting 'NEKO_G722=true', use 'NEKO_CAPTURE_AUDIO_CODEC=g722' instead")
	} else if viper.GetBool("pcmu") {
		s.AudioCodec = codec.PCMU()
		log.Warn().Msg("you are using deprecated config setting 'NEKO_PCMU=true', use 'NEKO_CAPTURE_AUDIO_CODEC=pcmu' instead")
	} else if viper.GetBool("pcma") {
		s.AudioCodec = codec.PCMA()
		log.Warn().Msg("you are using deprecated config setting 'NEKO_PCMA=true', use 'NEKO_CAPTURE_AUDIO_CODEC=pcma' instead")
	}

	audioBitrate := viper.GetUint("audio_bitrate")
	audioPipeline := viper.GetString("audio")

	// audio pipeline
	if audioBitrate != 0 || audioPipeline != "" {
		pipeline, err := NewAudioPipeline(s.AudioCodec, s.AudioDevice, audioPipeline, audioBitrate)
		if err != nil {
			log.Warn().Err(err).Msg("unable to create audio pipeline, using default")
		} else {
			s.AudioPipeline = pipeline
		}
		// TODO: add deprecated warning and proper alternative
	}

	//
	// broadcast
	//

	if viper.IsSet("broadcast_pipeline") {
		s.BroadcastPipeline = viper.GetString("broadcast_pipeline")
		log.Warn().Msg("you are using v2 configuration 'NEKO_BROADCAST_PIPELINE' which is deprecated, please use 'NEKO_CAPTURE_BROADCAST_PIPELINE' instead")
	}
	if viper.IsSet("broadcast_url") {
		s.BroadcastUrl = viper.GetString("broadcast_url")
		log.Warn().Msg("you are using v2 configuration 'NEKO_BROADCAST_URL' which is deprecated, please use 'NEKO_CAPTURE_BROADCAST_URL' instead")
	}
	if viper.IsSet("broadcast_autostart") {
		s.BroadcastAutostart = viper.GetBool("broadcast_autostart")
		log.Warn().Msg("you are using v2 configuration 'NEKO_BROADCAST_AUTOSTART' which is deprecated, please use 'NEKO_CAPTURE_BROADCAST_AUTOSTART' instead")
	}
}