#!/bin/bash
LOG="$HOME/.local/logs/drm-hotplug.log"
mkdir -p "$HOME/.local/logs"
export DISPLAY=:0

log() {
    echo "$(date '+%Y-%m-%d %H:%M:%S') $1" | tee -a "$LOG" 2>&1
}

log "Start monitor (user=$USER, display=$DISPLAY)"

CONNECTOR=""
for p in /sys/class/drm/card1-HDMI-A-1 /sys/class/drm/card0-HDMI-A-1; do
    [ -e "$p/status" ] && { CONNECTOR="$p"; break; }
done
[ -z "$CONNECTOR" ] && CONNECTOR=$(find /sys/class/drm -maxdepth 1 -name "*HDMI-A-1" -type d | head -1)

if [ -z "$CONNECTOR" ] || [ ! -e "$CONNECTOR/status" ]; then
    log "ERROR: No HDMI-A-1 found"
    exit 1
fi

MODE_NAME="1920x1080_60.00"
if ! xrandr 2>/dev/null | grep -q "$MODE_NAME"; then
    xrandr --newmode "$MODE_NAME" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 2>/dev/null || true
fi
xrandr --addmode VIRTUAL1 "$MODE_NAME" 2>/dev/null || true

LAST_STATE=$(cat "$CONNECTOR/status" 2>/dev/null || echo unknown)
log "Initial: $LAST_STATE"

if [ "$LAST_STATE" != "connected" ]; then
    log "Initially disconnected, activate VIRTUAL1"
    xrandr --output HDMI1 --off 2>/dev/null || true
    xrandr --output VIRTUAL1 --mode "$MODE_NAME" --primary 2>/dev/null || true
fi

while true; do
    CURRENT=$(cat "$CONNECTOR/status" 2>/dev/null || echo unknown)
    if [ "$CURRENT" != "$LAST_STATE" ]; then
        log "Change: $LAST_STATE -> $CURRENT"
        if [ "$CURRENT" = "connected" ]; then
            xrandr --output VIRTUAL1 --off 2>/dev/null || true
            xrandr --output HDMI1 --auto --primary 2>/dev/null || true
            log "HDMI1 primary"
        else
            xrandr --output HDMI1 --off 2>/dev/null || true
            xrandr --output VIRTUAL1 --mode "$MODE_NAME" --primary 2>/dev/null || true
            log "VIRTUAL1 primary"
        fi
        LAST_STATE="$CURRENT"
    fi
    sleep 2
done