#!/usr/bin/env bash
set -euo pipefail

BASE="/var/lib/dmarc"
INBOX="$BASE/reports"
PROC="$BASE/processed"
LOGF="$BASE/logs/collector.log"

umask 027

TMPDIR="$(mktemp -d)"
EML="$TMPDIR/mail.eml"
cat > "$EML"

ripmime --no-nameless --name-by-type --overwrite -i "$EML" -d "$TMPDIR" >>"$LOGF" 2>&1 || true

TODAY="$(date -u +%Y/%m/%d)"
OUTDIR="$INBOX/$TODAY"
mkdir -p "$OUTDIR"

moved=0
shopt -s nullglob
for f in "$TMPDIR"/*; do
  case "$f" in
    *.xml|*.XML|*.gz|*.zip)
      sha="$(sha256sum "$f" | awk '{print $1}')"
      base="$(basename "$f")"
      dst="$OUTDIR/$(date -u +%Y%m%dT%H%M%SZ)_${sha:0:12}_$base"
      mv "$f" "$dst"
      echo "$(date -Is) stored $dst" >> "$LOGF"
      moved=$((moved+1))
      ;;
    *) : ;;
  esac
done

mkdir -p "$PROC"
mv "$EML" "$PROC/$(date -u +%Y%m%dT%H%M%SZ)_mail.eml" || true
rm -rf "$TMPDIR"

if (( moved > 0 )); then
  exit 0
else
  echo "$(date -Is) no usable attachment in message" >> "$LOGF"
  exit 0
fi