#!/usr/bin/env bash
# Dumps accounts + aliases from a docker-mailserver config directory into a
# migration CSV skeleton (email,new_password,old_password,aliases,quota_mb).
# Passwords are left blank: docker-mailserver only stores irreversible hashes.
set -euo pipefail

CONFIG_DIR="${1:?Usage: $0 /path/to/docker-mailserver/config}"
ACCOUNTS_FILE="$CONFIG_DIR/postfix-accounts.cf"
ALIASES_FILE="$CONFIG_DIR/postfix-virtual.cf"

if [[ ! -f "$ACCOUNTS_FILE" ]]; then
  echo "postfix-accounts.cf not found under $CONFIG_DIR" >&2
  exit 1
fi

echo "email,new_password,old_password,aliases,quota_mb"

while IFS='|' read -r email _hash; do
  [[ -z "$email" || "$email" == \#* ]] && continue

  aliases=""
  if [[ -f "$ALIASES_FILE" ]]; then
    # postfix-virtual.cf lines look like: alias@domain destination@domain
    aliases=$(awk -v dest="$email" '$2 == dest { sub(/@.*/, "", $1); printf "%s;", $1 }' "$ALIASES_FILE")
    aliases="${aliases%;}"
  fi

  echo "$email,,,${aliases},"
done < "$ACCOUNTS_FILE"