#!/bin/bash
# Brightness slider for external monitor using ddcutil

# Monitor configuration
MONITOR_SERIAL="6L1M413"
VCP_CODE=10

# Get current brightness (VCP code 10)
current_output=$(ddcutil getvcp --sn "$MONITOR_SERIAL" "$VCP_CODE" 2>/dev/null)

if [ $? -ne 0 ] || [ -z "$current_output" ]; then
    echo "Error: Could not communicate with monitor $MONITOR_SERIAL" >&2
    exit 1
fi

# Parse current brightness from output like "VCP code 0x10 (Brightness): current value = 50, max value = 100"
current_percent=$(echo "$current_output" | grep -oP 'current value\s*=\s*\K\d+')

if [ -z "$current_percent" ]; then
    echo "Error: Could not parse brightness value" >&2
    exit 1
fi

# Round to nearest 5
current_percent=$(((current_percent + 2) / 5 * 5))

# Generate brightness levels
levels=""
for i in {0..100..5}; do
    if [ "$i" -eq "$current_percent" ]; then
        levels+="● $i%\n"
    else
        levels+="  $i%\n"
    fi
done

# Show menu and get selection
selected=$(echo -e "$levels" | bemenu -l 15 -p "󰃞 Monitor Brightness" --counter always -c -W 0.2 -B 10 \
    --fixed-height --fn 'B612 11' \
    --bdr "#323232" --tf "#FFFFFF" --hf "#FFFFFF")

# Exit if nothing selected
if [ -z "$selected" ]; then
    exit 0
fi

# Extract percentage from selection
percent=$(echo "$selected" | grep -oP '\d+(?=%)')

# Set brightness
if [ -n "$percent" ]; then
    ddcutil setvcp --sn "$MONITOR_SERIAL" "$VCP_CODE" "$percent"
fi