#!/bin/sh

set -e
VIRTMON=virtmon
SC_FONT=${SC_FONT:-'WenQuanYi-Micro-Hei'}
PID_FILE="/tmp/recording.pid"
OUTPUT_DIR="/home/klesh/Videos"

_stop_recording() {
    killall screenkey 2>/dev/null || true
    if [ -f "$PID_FILE" ]; then
        PID=$(cat "$PID_FILE")
        [ -n "$PID" ] && kill -s 15 $PID || true
        rm "$PID_FILE"
    fi
}

_start_video_recording() {
    _stop_recording
    if [ "$#" -ne 5 ]; then
        echo "expected x y w h fps , got $argv"
        exit 1
    fi
    X=$1
    Y=$2
    W=$3
    H=$4
    FPS=${5:-30}

    OUTPUT_FILE="$OUTPUT_DIR/screencast-$(date '+%y%m%d-%H%M-%S').mp4"
    touch "$PID_FILE"
    sleep 1
    echo recording to $OUTPUT_FILE
    # ffmpeg \
    #     -f x11grab -s $W'x'$H -i "$DISPLAY+$X,$Y" \
    #     -f alsa -i default \
    #     -r $FPS -c:v h264 -crf 0 -preset ultrafast \
    #     -c:a aac \
    #     $OUTPUT_FILE
    ffmpeg \
        -f x11grab -s $W'x'$H -i "$DISPLAY+$X,$Y" \
        -f alsa -i default \
        -r $FPS -c:v h264 -crf 0 -preset ultrafast \
        -c:a aac \
        $OUTPUT_FILE > /dev/null 2>&1 </dev/null &
    echo "$!" > "$PID_FILE"
}

audio() {
    _stop_recording
    OUTPUT_FILE="$OUTPUT_DIR/audio-$(date '+%y%m%d-%H%M-%S').aac"
    touch "$PID_FILE"
    sleep 1
    ffmpeg \
        -f alsa -i default \
        -c:a aac \
        $OUTPUT_FILE > /dev/null 2>&1 </dev/null &
    echo "$!" > "$PID_FILE"
    echo $OUTPUT_FILE
}

theend() {
    _stop_recording
}

prepare() {
    # wanted size
    WW=${1:-1920}
    WH=${2:-1080}

    # actual size
    #  0: +*DP-1 3440/797x1440/333+0+0  DP-1
    #            resolution / physical
    WHXY=$(xrandr --listmonitors | awk '$2 ~ /\*/ {
        split($3, WHXY, /x|+|\//)
        match($2, /\*(.+)$/, name)
        print WHXY[1] " " WHXY[2] " " WHXY[3] " " WHXY[4] " " WHXY[5] " " WHXY[6] " " name[1]
    }')
    W=$(echo "$WHXY" | awk '{print $1}')
    PW=$(echo "$WHXY" | awk '{print $2}')
    H=$(echo "$WHXY" | awk '{print $3}')
    PH=$(echo "$WHXY" | awk '{print $4}')
    X=$(echo "$WHXY" | awk '{print $5}')
    Y=$(echo "$WHXY" | awk '{print $6}')
    NAME=$(echo "$WHXY" | awk '{print $7}')

    # rest size
    RW=$(( $W - $WW ))
    RH=$(( $H - $WH ))
    if [ "$RW" -lt 0 ] && [ "$RH" -lt 0 ]; then
        return 0
    fi

    # adjust rest size, either split horizontally or vertically
    # physical size for wanted monitor
    PWW=$(echo "scale=3; r = $WW / $W * $PW; scale=0; r / 1" | bc)
    PWH=$(echo "scale=3; r = $WH / $H * $PH; scale=0; r / 1" | bc)
    if [ "$RW" -gt 0 ]; then
        # horizontally
        PRW=$(( $PW - $PWW ))
        PRH=$PH
        RH=$H
        RX=$WW
        RY=0
    fi
    # echo WW $WW
    # echo PWW $PWW
    # echo WH $WH
    # echo PWH $PWH
    # echo X $X
    # echo Y $Y
    # echo RW $RW
    # echo PRW $PRW
    # echo RH $RH
    # echo PRH $PRH
    # echo RX $RX
    # echo RY $RY
    # exit

    # create virtual monitors
    echo xrandr --setmonitor $VIRTMON-1 "${WW}/${PWW}x${WH}/${PWH}+0+0" $NAME
    echo xrandr --setmonitor $VIRTMON-2 "${RW}/${PRW}x${RH}/${PRH}+${RX}+${RY}" none
    echo nitrogen --restore
}

finish() {
    xrandr --delmonitor $VIRTMON-1
    xrandr --delmonitor $VIRTMON-2
    nitrogen --restore
}

window() {
    FPS=${1:-5}

    notify-send "Please click the window that you want to record"
    WININFO=$(xwininfo)
    X=$(echo "$WININFO" | awk -F: '$1 ~ /Absolute upper-left X/ { print $2  }')
    Y=$(echo "$WININFO" | awk -F: '$1 ~ /Absolute upper-left Y/ { print $2  }')
    W=$(echo "$WININFO" | awk -F: '$1 ~ /Width/ { print $2  }')
    H=$(echo "$WININFO" | awk -F: '$1 ~ /Height/ { print $2  }')
    _start_video_recording $X $Y $W $H $FPS
}

desktop() {
    FPS=${1:-30}
    # INPUT 0: +*DP-1 3440/797x1440/333+2560+80  DP-1
    # OUTPUT 2560 80 3440 1440
    XYWH=$(xrandr --listmonitors | awk '$2 ~ /\*/ {
        split($3, pos, /\/|\+|x/)
        print pos[5] " " pos[6] " " pos[1] " " pos[3]
    }')
    # pacmd set-source-volume noechosource 52000
    _start_video_recording $XYWH $FPS

}

togif() {
    IN_FILE=$1
    OUTPUT_FILE=$1
    convert -set delay 10 -layers Optimize $IN_FILE -ordered-dither o8x8,23 +map $OUTPUT_FILE
}

cover() {
    IN_FILE=$1
    TEXT=$2
    OUTPUT=${3:-'cover.png'}
    GRAVITY=${4:-'center'}

    X=50
    if [ "$GRAVITY" = "50" ]; then
        X=0
    fi
    magick convert $IN_FILE -thumbnail 1146x -background black -gravity $gravity -extent 1146x717 resized.png
    magick convert resized.png \
        -blur 0x8 \
        -gravity $GRAVITY \
        -fill black \
        -pointsize 120 -font $SC_FONT \
        -interline-spacing 20 \
        -stroke '#e1e1e1' -strokewidth 40 \
        -annotate +$X+0 "$TEXT" \
        -stroke '#000000' -strokewidth 5 \
        -annotate +$X+0 "$TEXT"\
        $OUTPUT_FILE
}

if [ "$#" -eq 0 ]; then
    desktop
else
    $@
fi