#!/bin/bash
# Export auth and character databases to ExportBackup_<timestamp>/
set -euo pipefail

# Get the directory where this script is located
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# Change to the script directory to ensure relative paths work correctly
cd "$SCRIPT_DIR"

usage(){
  cat <<EOF
Usage: ./backup-export.sh [output_dir] <mysql_password> <auth_db> <characters_db>

Creates a timestamped backup of the auth and character databases.

Arguments:
  [output_dir] Output directory (default: .)
  <mysql_password> MySQL root password (required)
  <auth_db> Auth database name (required)
  <characters_db> Characters database name (required)

Outputs:
  ExportBackup_YYYYMMDD_HHMMSS/
    acore_auth.sql.gz
    acore_characters.sql.gz
    manifest.json

Services stay online; backup uses mysqldump.
EOF
}

case "${1:-}" in
  -h|--help) usage; exit 0;;
esac

# Check if required parameters are provided (minimum 3: password, auth_db, char_db)
if [[ $# -lt 3 ]]; then
  echo "Error: Required parameters missing. Usage: ./backup-export.sh [output_dir] <mysql_password> <auth_db> <characters_db>" >&2
  exit 1
fi

# Handle both cases: with and without output_dir parameter
if [[ $# -eq 3 ]]; then
  # No output_dir provided, use current script directory
  DEST_PARENT="."
  MYSQL_PW="$1"
  DB_AUTH="$2"
  DB_CHAR="$3"
elif [[ $# -ge 4 ]]; then
  # output_dir provided
  DEST_PARENT="$1"
  MYSQL_PW="$2"
  DB_AUTH="$3"
  DB_CHAR="$4"
fi

# Convert output directory to absolute path if it's relative
if [[ ! "$DEST_PARENT" = /* ]]; then
  DEST_PARENT="$SCRIPT_DIR/$DEST_PARENT"
fi

TIMESTAMP="$(date +%Y%m%d_%H%M%S)"
DEST_DIR="${DEST_PARENT%/}/ExportBackup_${TIMESTAMP}"
mkdir -p "$DEST_DIR"

dump_db(){
  local db="$1" outfile="$2"
  echo "Dumping $db -> $outfile"
  docker exec ac-mysql mysqldump -uroot -p"$MYSQL_PW" "$db" | gzip > "$outfile"
}

dump_db "$DB_AUTH" "$DEST_DIR/acore_auth.sql.gz"
dump_db "$DB_CHAR" "$DEST_DIR/acore_characters.sql.gz"

cat > "$DEST_DIR/manifest.json" <<JSON
{
  "generated_at": "$(date --iso-8601=seconds)",
  "databases": {
    "auth": "$DB_AUTH",
    "characters": "$DB_CHAR"
  }
}
JSON

echo "Backups saved under $DEST_DIR"