#!/usr/bin/env bash
# Watch multiple directories
WATCH_DIRS=("/tmp" "/config/Fiscality/workspace")

export DISPLAY=${DISPLAY:-:1}
export XAUTHORITY=${XAUTHORITY:-/home/abc/.Xauthority}
LAST_SCAN_STATE_FILE="/tmp/.filewatcher_state"
LOG_FILE="/tmp/filewatcher.log"

# Allow abc user access to X
xhost +SI:localuser:abc >/dev/null 2>&1 || true

# Load previous seen files
declare -A seen
if [ -f "$LAST_SCAN_STATE_FILE" ]; then
  while IFS= read -r f; do
    [ -n "$f" ] && seen["$f"]=1
  done < "$LAST_SCAN_STATE_FILE"
fi

persist_seen() {
  : > "$LAST_SCAN_STATE_FILE"
  for f in "${!seen[@]}"; do
    printf '%s\n' "$f" >> "$LAST_SCAN_STATE_FILE"
  done
}

echo "$(date): File watcher started, watching: ${WATCH_DIRS[*]}" >> "$LOG_FILE"

while true; do
  # Iterate through all watched directories
  for WATCH_DIR in "${WATCH_DIRS[@]}"; do
    # Skip if directory doesn't exist yet
    if [ ! -d "$WATCH_DIR" ]; then
      echo "$(date): Directory $WATCH_DIR does not exist yet" >> "$LOG_FILE"
      continue
    fi

    # Iterate over every entry in the directory
    for file in "$WATCH_DIR"/*; do
      [ -f "$file" ] || continue       # only regular files
      # skip our own state file if inside the watched dir
      [ "$file" = "$LAST_SCAN_STATE_FILE" ] && continue

      if [ -z "${seen["$file"]}" ]; then
        # new file found
        echo "$(date): New file detected: $file" >> "$LOG_FILE"
        seen["$file"]=1
        # Open with the default app (xdg-open) as user abc
        if command -v gosu >/dev/null 2>&1; then
          gosu abc env DISPLAY="$DISPLAY" XAUTHORITY="$XAUTHORITY" \
            nohup xdg-open -- "$file" >/dev/null 2>&1 &
          echo "$(date): Opened $file with xdg-open (gosu)" >> "$LOG_FILE"
        else
          # fallback
          su -s /bin/bash abc -c "env DISPLAY='$DISPLAY' XAUTHORITY='$XAUTHORITY' nohup xdg-open -- '$file' >/dev/null 2>&1" || true
          echo "$(date): Opened $file with xdg-open (su)" >> "$LOG_FILE"
        fi
      fi
    done
  done

  persist_seen
  sleep 2
done