#!/bin/bash
#
# Bashup - A set of bash scripts for managing backups.
# https://git.stack-source.com/msb/bashup
# MIT License Copyright (c) 2021 Matthew Saunders Brown

# load include file
source $(dirname $0)/bashup.sh

help()
{
  thisfilename=$(basename -- "$0")
  echo "Bashup - A set of bash scripts for managing backups."
  echo "https://git.stack-source.com/msb/bashup"
  echo "MIT License Copyright (c) 2021 Matthew Saunders Brown"
  echo ""
  echo "List backups that have been taken and are available for doing restores."
  echo ""
  echo "Usage: $thisfilename [-b <backupdate>] [-c <category>] [-h]"
  echo ""
  echo "  -b <backupdate> Backup date/archive to list."
  echo "  -c <category>   Category of backup to verify/list."
  echo "  -h              Print this help."
  echo "                  If no options are specified a list of backup (dates)"
  echo "                  will be displayed. If only the -b option is used then"
  echo "                  a list of available categories (directories) will be"
  echo "                  displayed. If both -b & -c options are specified then"
  echo "                  the specific backups (files/directories, databases,"
  echo "                  dns zones) available for restoring will be displayed."
  exit
}

# set any options that were passed
while getopts "b:c:h" opt; do
  case "${opt}" in
    h )
      help
      exit;;
    b )
      backup=${OPTARG}
      ;;
    c )
      category=${OPTARG}
      ;;
    \? )
      echo "Invalid option: $OPTARG" 1>&2
      exit 1;;
    : )
      echo "Invalid option: $OPTARG requires an argument" 1>&2
      exit 1;;
  esac
done

if [ ! -z "$backup" ]; then
  if [ -d "$backup_storage_dir/$backup" ]; then
    if [ ! -z "$category" ]; then
      if [ -d "$backup_storage_dir/$backup/$category" ]; then
        if [ "$category" == "files" ]; then
          # check for a list available backup_dirs
          for dir in "${backup_dirs[@]}"; do
            if [ -d $backup_storage_dir/$backup/files$dir ]; then
              echo "$dir"
            fi
          done
        elif [ "$category" == "mysql" ]; then
          # list databases that have dumps available for restoring
          existing_dumps=($(ls $backup_storage_dir/$backup/mysql))
          for existing_dump in "${existing_dumps[@]}"; do
            echo "$(basename $existing_dump .sql.gz)"
          done
        elif [ "$category" == "pdns" ]; then
          # list zones available for restoring
          existing_zones=($(ls $backup_storage_dir/$backup/pdns))
          for existing_zone in "${existing_zones[@]}"; do
            echo "$(basename $existing_zone .zone)"
          done
        else
          # unexpected category, just list contents of dir
          ls -1 $backup_storage_dir/$backup/$category
        fi
      else
        echo "ERROR: Backup $backup_storage_dir/$backup/$category does not exist."
        exit 1
      fi
    else
      # list backup dirs (categories) available for restore
      ls -1 $backup_storage_dir/$backup
    fi
  else
    echo "ERROR: Backup dir for $backup does not exist."
    exit 1
  fi
else
  # output list of backups (dates)
  for existing_backup in "${existing_backups[@]}"; do
    echo $existing_backup
  done
fi

bashup::unmount_storage_dir

exit 0