#!/bin/bash

# Start and stop a screenrecording, which will be saved to ~/Videos by default.
# Alternative location can be set via NOMARCHY_SCREENRECORD_DIR or XDG_VIDEOS_DIR ENVs.
# Resolution is capped to 4K for monitors above 4K, native otherwise.
# Override via --resolution= (e.g. --resolution=1920x1080, --resolution=0x0 for native).

[[ -f ~/.config/user-dirs.dirs ]] && source ~/.config/user-dirs.dirs
OUTPUT_DIR="${NOMARCHY_SCREENRECORD_DIR:-${XDG_VIDEOS_DIR:-$HOME/Videos}}"

if [[ ! -d $OUTPUT_DIR ]]; then
  notify-send "Screen recording directory does not exist: $OUTPUT_DIR" -u critical -t 3000
  exit 1
fi

DESKTOP_AUDIO="false"
MICROPHONE_AUDIO="false"
WEBCAM="false"
WEBCAM_DEVICE=""
RESOLUTION=""
STOP_RECORDING="false"
RECORDING_FILE="/tmp/nomarchy-screenrecord-filename"

for arg in "$@"; do
  case "$arg" in
  --with-desktop-audio) DESKTOP_AUDIO="true" ;;
  --with-microphone-audio) MICROPHONE_AUDIO="true" ;;
  --with-webcam) WEBCAM="true" ;;
  --webcam-device=*) WEBCAM_DEVICE="${arg#*=}" ;;
  --resolution=*) RESOLUTION="${arg#*=}" ;;
  --stop-recording) STOP_RECORDING="true" ;;
  esac
done

start_webcam_overlay() {
  cleanup_webcam

  # Auto-detect first available webcam if none specified
  if [[ -z $WEBCAM_DEVICE ]]; then
    WEBCAM_DEVICE=$(v4l2-ctl --list-devices 2>/dev/null | grep -m1 "^[[:space:]]*/dev/video" | tr -d '\t')
    if [[ -z $WEBCAM_DEVICE ]]; then
      notify-send "No webcam devices found" -u critical -t 3000
      return 1
    fi
  fi

  # Get monitor scale
  local scale=$(hyprctl monitors -j | jq -r '.[] | select(.focused == true) | .scale')

  # Target width (base 360px, scaled to monitor)
  local target_width=$(awk "BEGIN {printf \"%.0f\", 360 * $scale}")

  # Try preferred 16:9 resolutions in order, use first available
  local preferred_resolutions=("640x360" "1280x720" "1920x1080")
  local video_size_arg=""
  local available_formats=$(v4l2-ctl --list-formats-ext -d "$WEBCAM_DEVICE" 2>/dev/null)

  for resolution in "${preferred_resolutions[@]}"; do
    if echo "$available_formats" | grep -q "$resolution"; then
      video_size_arg="-video_size $resolution"
      break
    fi
  done

  ffplay -f v4l2 $video_size_arg -framerate 30 "$WEBCAM_DEVICE" \
    -vf "crop=iw/2:ih,scale=${target_width}:-1" \
    -window_title "WebcamOverlay" \
    -noborder \
    -fflags nobuffer -flags low_delay \
    -probesize 32 -analyzeduration 0 \
    -loglevel quiet &
  sleep 1
}

cleanup_webcam() {
  pkill -f "WebcamOverlay" 2>/dev/null
}

default_resolution() {
  local width height
  read -r width height < <(hyprctl monitors -j | jq -r '.[] | select(.focused == true) | "\(.width) \(.height)"')
  if ((width > 3840 || height > 2160)); then
    echo "3840x2160"
  else
    echo "0x0"
  fi
}

start_screenrecording() {
  local filename="$OUTPUT_DIR/screenrecording-$(date +'%Y-%m-%d_%H-%M-%S').mp4"
  local audio_devices=""
  local audio_args=()

  [[ $DESKTOP_AUDIO == "true" ]] && audio_devices+="default_output"

  if [[ $MICROPHONE_AUDIO == "true" ]]; then
    # Merge audio tracks into one - separate tracks only play one at a time in most players
    [[ -n $audio_devices ]] && audio_devices+="|"
    audio_devices+="default_input"
  fi

  [[ -n $audio_devices ]] && audio_args+=(-a "$audio_devices" -ac aac)

  local resolution="${RESOLUTION:-$(default_resolution)}"

  gpu-screen-recorder -w portal -k auto -s "$resolution" -f 60 -fm cfr -fallback-cpu-encoding yes -o "$filename" "${audio_args[@]}" &
  local pid=$!

  # Wait for recording to actually start (file appears after portal selection)
  while kill -0 $pid 2>/dev/null && [[ ! -f $filename ]]; do
    sleep 0.2
  done

  if kill -0 $pid 2>/dev/null; then
    echo "$filename" >"$RECORDING_FILE"
    toggle_screenrecording_indicator
  fi
}

stop_screenrecording() {
  pkill -SIGINT -f "^gpu-screen-recorder" # SIGINT required to save video properly

  # Wait a maximum of 5 seconds to finish before hard killing
  local count=0
  while pgrep -f "^gpu-screen-recorder" >/dev/null && ((count < 50)); do
    sleep 0.1
    count=$((count + 1))
  done

  toggle_screenrecording_indicator
  cleanup_webcam

  if pgrep -f "^gpu-screen-recorder" >/dev/null; then
    pkill -9 -f "^gpu-screen-recorder"
    notify-send "Screen recording error" "Recording process had to be force-killed. Video may be corrupted." -u critical -t 5000
  else
    trim_first_frame
    local filename=$(cat "$RECORDING_FILE" 2>/dev/null)
    local preview="${filename%.mp4}-preview.png"

    # Generate a preview thumbnail from the first frame
    ffmpeg -y -i "$filename" -ss 00:00:00.1 -vframes 1 -q:v 2 "$preview" -loglevel quiet 2>/dev/null

    (
      ACTION=$(notify-send "Screen recording saved" "Open with Super + Alt + , (or click this)" -t 10000 -i "${preview:-$filename}" -A "default=open")
      [[ $ACTION == "default" ]] && mpv "$filename"
      rm -f "$preview"
    ) &
  fi

  rm -f "$RECORDING_FILE"
}

toggle_screenrecording_indicator() {
  pkill -RTMIN+8 waybar
}

screenrecording_active() {
  pgrep -f "^gpu-screen-recorder" >/dev/null
}

trim_first_frame() {
  local latest
  latest=$(cat "$RECORDING_FILE" 2>/dev/null)

  if [[ -n $latest && -f $latest ]]; then
    local trimmed="${latest%.mp4}-trimmed.mp4"
    if ffmpeg -y -ss 0.1 -i "$latest" -c copy "$trimmed" -loglevel quiet 2>/dev/null; then
      mv "$trimmed" "$latest"
    else
      rm -f "$trimmed"
    fi
  fi
}

if screenrecording_active; then
  stop_screenrecording
elif [[ $STOP_RECORDING == "true" ]]; then
  exit 1
else
  [[ $WEBCAM == "true" ]] && start_webcam_overlay

  start_screenrecording || cleanup_webcam
fi
