#!/usr/bin/env bash
set -euo pipefail

### CONFIG ###
DATE=$(date +%F)
#BACKUPS_DIR="$HOME/backups/synapse"
BACKUPS_DIR="/mnt/disk/backups/synapse"
DRY_RUN=true
KEEP_COUNT=1

# Function to display usage information
usage() {
  echo "Usage: $0 [--run]"
  exit 1
}

# Parse command-line arguments
for arg in "$@"; do
  case $arg in
    --run)
      DRY_RUN=false
      shift
      ;;
    *)
      usage
      ;;
  esac
done

### 8️⃣ Optional: Full combined archiveve (run with sudo)
echo "📅 Date: $DATE"
echo "📁 Backups dir: $BACKUPS_DIR"
echo "📦 Start reading backup files..."
echo


TIMESTAMP_FILE="$BACKUPS_DIR/backup_timestamps.txt"

# Check if the backups directory exists
if [ ! -d "$BACKUPS_DIR" ]; then
  echo "Backup directory does not exist: $BACKUPS_DIR"
  exit 1
fi


cd $BACKUPS_DIR

# Count the number of existing backups
TOTAL_BACKUPS=$(find . -name 'full-backup-*.tar.gz' | wc -l)
echo "Existing backup files ($TOTAL_BACKUPS) :"
# Find all full-backup-*.tar.gz files and list them
find . -name 'full-backup-*.tar.gz'| sort -k2,2 -t. -n -r | while IFS= read -r file; do
  echo "- $file"
done
echo 


# Find and list files that should be removed
echo "Files that will be deleted:"
files_to_delete=()
while IFS= read -r -d $'\0' dir; do
  files_to_delete+=("$dir")
  echo "- $dir"
done < <(find . -name 'full-backup-*.tar.gz' -mtime +$KEEP_COUNT -print0)
echo

# Prompt for confirmation if not in dry-run mode
#if [ "$DRY_RUN" = false ]; then
#  read -p "Do you want to delete these files? (y/n): " confirm
#  if [[ $confirm != [yY] ]]; then
#    echo "Deletion cancelled."
#    exit 0
#  fi
#  echo
#fi

# Delete the files in dry-run mode or actually delete them
for file in "${files_to_delete[@]}"; do
  if [ "$DRY_RUN" = true ]; then
  echo "Will be deleted (Dry-Run): $file"
  else
    rm "$file"
    echo "Deleted $file"
  fi
done
echo

# Update the timestamp file (optional, but good practice)
if [ "$DRY_RUN" = false ]; then
  echo "$(date +%F)" > "$BACKUPS_DIR/backup_timestamps.txt"
fi

echo "Cleanup completed."