#!/usr/bin/env bash
# ping-charles.sh — SMS Charles via T-Mobile email-to-SMS gateway.
# Usage: ping-charles.sh "short message" [severity]
# Relay: curl SMTP (Cloudron mail submission). Config: /home/reachableceo/.coordinate/secrets/ping-charles.env (0600)
#   PING_SMTP_HOST=mail.knownelement.com:587
#   PING_SMTP_USER=...
#   PING_SMTP_PASS=...
#   PING_FROM=...
# Until wired, messages queue in ~/.coordinate/outbox/ping-queue.txt (flushed on first successful send).

set -euo pipefail
DEST="8182807059@tmomail.net"
CONF="$HOME/.coordinate/secrets/ping-charles.env"
QUEUE="$HOME/.coordinate/outbox/ping-queue.txt"
MSG="${1:?usage: ping-charles.sh \"message\" [severity]}"
SEV="${2:-info}"
STAMP="$(date '+%m-%d %H:%M')"
LINE="[$SEV $STAMP MOPAC] $MSG"

if [ ! -f "$CONF" ]; then
  mkdir -p "$(dirname "$QUEUE")"
  echo "$LINE" >> "$QUEUE"
  echo "ping queued (no relay config): $LINE" >&2
  exit 0
fi
set -a; . "$CONF"; set +a

send_one() {
  printf 'From: %s\nTo: %s\nSubject: MOPAC %s\nContent-Type: text/plain; charset=UTF-8\n\n%s\n' \
    "$PING_FROM" "$DEST" "$SEV" "$1" \
  | curl -sS --max-time 30 --ssl-reqd --url "smtp://$PING_SMTP_HOST" \
      --mail-from "$PING_FROM" --mail-rcpt "$DEST" \
      -u "$PING_SMTP_USER:$PING_SMTP_PASS" \
      -T - && return 0 || return 1
}

if [ -f "$QUEUE" ] && [ -s "$QUEUE" ]; then
  while IFS= read -r queued; do
    send_one "$queued" && sed -i '1d' "$QUEUE" || break
  done < /dev/null
fi

if send_one "$LINE"; then
  echo "sms sent: $LINE" >&2
  exit 0
else
  mkdir -p "$(dirname "$QUEUE")"; echo "$LINE" >> "$QUEUE"
  echo "sms send FAILED, queued: $LINE" >&2
  exit 1
fi