#!/bin/bash

# Output image
OUTPUT="/tmp/imclock.png"

# Image size and center
SIZE=1000
CENTER=$((SIZE / 2))
LENGTH_HOUR=320
LENGTH_MIN=390

# Tick mark radius
TICK_INNER=$((CENTER - 20))
TICK_OUTER=$((CENTER - 5))

# Get current time
HOUR=$(date +%I)    # 12-hour format
MIN=$(date +%M)

# Calculate angles
ANGLE_HOUR=$(echo "scale=6; (30 * $HOUR + 0.5 * $MIN)" | bc)
ANGLE_MIN=$(echo "scale=6; 6 * $MIN" | bc)

# Convert degrees to radians
deg2rad() {
    echo "scale=10; $1 * 4 * a(1) / 180" | bc -l
}

# Compute a point on the circle at a given radius and angle
polar_to_xy() {
    local angle_deg=$1
    local radius=$2
    local angle_rad=$(deg2rad "$angle_deg")
    local x=$(echo "$CENTER + $radius * s($angle_rad)" | bc -l)
    local y=$(echo "$CENTER - $radius * c($angle_rad)" | bc -l)
    printf "%.0f %.0f\n" "$x" "$y"
}

# Hour and minute hand endpoints
END_HOUR=($(polar_to_xy "$ANGLE_HOUR" $LENGTH_HOUR))
END_MIN=($(polar_to_xy "$ANGLE_MIN" $LENGTH_MIN))

# Start drawing commands string
DRAW_CMDS=""

# Add 12 hour tick marks (every 30 degrees)
for i in {0..11}; do
    angle=$((i * 30))
    INNER=($(polar_to_xy "$angle" $TICK_INNER))
    OUTER=($(polar_to_xy "$angle" $TICK_OUTER))
    DRAW_CMDS+="line ${INNER[0]},${INNER[1]} ${OUTER[0]},${OUTER[1]} "
done

# Add clock hands to DRAW_CMDS
DRAW_CMDS+="stroke-width 42 line $CENTER,$CENTER ${END_HOUR[0]},${END_HOUR[1]} "
DRAW_CMDS+="stroke-width 16 line $CENTER,$CENTER ${END_MIN[0]},${END_MIN[1]}"

# Generate image with ImageMagick
convert -size ${SIZE}x${SIZE} xc:transparent \
    -stroke white -strokewidth 32 \
    -draw "$DRAW_CMDS" \
    $OUTPUT

#echo "✅ Clock image with hour ticks saved to $OUTPUT"

# fix aspect for terminal usage
mogrify -resize 1450x1000\! "$OUTPUT"

# padding ?
mogrify -background transparent -gravity center -extent 3100x1050 "$OUTPUT"