#!/usr/bin/env bash
# Runs imapsync (via the upstream gilleslamiral/imapsync image) for every account
# in a migration accounts.csv, copying mail from docker-mailserver to Stalwart.
set -euo pipefail

SOURCE_PORT=993
DEST_PORT=993
DRY_RUN=false

usage() {
  echo "Usage: $0 -c accounts.csv -s source-host -t dest-host [-p source-port] [-q dest-port] [-n]" >&2
  exit 1
}

while getopts "c:s:t:p:q:n" opt; do
  case "$opt" in
    c) CSV="$OPTARG" ;;
    s) SOURCE_HOST="$OPTARG" ;;
    t) DEST_HOST="$OPTARG" ;;
    p) SOURCE_PORT="$OPTARG" ;;
    q) DEST_PORT="$OPTARG" ;;
    n) DRY_RUN=true ;;
    *) usage ;;
  esac
done
[[ -z "${CSV:-}" || -z "${SOURCE_HOST:-}" || -z "${DEST_HOST:-}" ]] && usage

while IFS=',' read -r email new_password old_password aliases quota_mb; do
  [[ -z "$email" ]] && continue

  if [[ -z "$old_password" || -z "$new_password" ]]; then
    echo "Missing old_password or new_password for $email" >&2
    exit 1
  fi

  echo "==> Syncing $email"

  args=(run --rm gilleslamiral/imapsync imapsync
    --host1 "$SOURCE_HOST" --port1 "$SOURCE_PORT" --ssl1 --user1 "$email" --password1 "$old_password"
    --host2 "$DEST_HOST" --port2 "$DEST_PORT" --ssl2 --user2 "$email" --password2 "$new_password"
    --automap --syncinternaldates --skipcrossduplicates --no-modulesversion)

  [[ "$DRY_RUN" == true ]] && args+=(--dry)

  if ! docker "${args[@]}"; then
    echo "warning: imapsync exited non-zero for $email" >&2
  fi
done < <(tail -n +2 "$CSV")