#!/bin/bash
# Supersam full DB backup (pg_dump) to S3 (Beget Cloud Storage)
# Dumps the complete supabase postgres database and uploads to S3.
# Retention: keeps last 30 days.
#
# Cron: 0 */12 * * * /opt/supersam/scripts/backup-pgdump-s3.sh >> /var/log/supersam-backup-pgdump.log 2>&1

set -euo pipefail

# ── Config ────────────────────────────────────────────────────────────────
AWS_ACCESS_KEY_ID="YG4MQNKAPNL65200MBUY"
AWS_SECRET_ACCESS_KEY="8mXkFM2VRQ3pN1Nx4mhmJ2jrZoB5YTPUa4CaZh43"
S3_ENDPOINT="https://s3.ru1.storage.beget.cloud"
S3_BUCKET="02f162ff4a18-supersam-s3"
S3_PREFIX="backups"

DB_CONTAINER="supabase-db"
DB_USER="supabase_admin"
DB_NAME="postgres"
DB_PASS="4fe80bb21c7c3d17a8d8b226adf7a479"

RETENTION_DAYS=30

# ── Runtime ───────────────────────────────────────────────────────────────
TIMESTAMP=$(date +%Y-%m-%d_%H%M)
DUMP_FILE="/tmp/supersam-dump-${TIMESTAMP}.sql.gz"
S3_PATH="s3://${S3_BUCKET}/${S3_PREFIX}/pgdump/supersam-db-${TIMESTAMP}.sql.gz"

export AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY

echo "[$(date)] Starting pg_dump backup..."

# ── Dump ──────────────────────────────────────────────────────────────────
echo "[$(date)] Dumping database..."
docker exec -e PGPASSWORD="${DB_PASS}" "${DB_CONTAINER}" \
  pg_dump -U "${DB_USER}" -d "${DB_NAME}" --no-owner --no-acl --clean --if-exists \
  | gzip -9 > "${DUMP_FILE}"

DUMP_SIZE=$(du -h "${DUMP_FILE}" | cut -f1)
echo "[$(date)] Dump created: ${DUMP_FILE} (${DUMP_SIZE})"

# ── Upload via mc ─────────────────────────────────────────────────────────
echo "[$(date)] Uploading to S3..."
mc cp "${DUMP_FILE}" "beget/${S3_BUCKET}/${S3_PREFIX}/pgdump/supersam-db-${TIMESTAMP}.sql.gz" --quiet 2>&1

echo "[$(date)] Uploaded to ${S3_PATH}"

# ── Cleanup local ─────────────────────────────────────────────────────────
rm -f "${DUMP_FILE}"
echo "[$(date)] Local cleanup done"

# ── Retention: delete S3 pgdump backups older than RETENTION_DAYS ─────────
echo "[$(date)] Cleaning S3 pgdump backups older than ${RETENTION_DAYS} days..."
CUTOFF=$(date -d "-${RETENTION_DAYS} days" +%Y-%m-%d)
mc ls "beget/${S3_BUCKET}/${S3_PREFIX}/pgdump/" 2>/dev/null \
  | awk '{print $NF}' \
  | while read -r fname; do
      file_date=$(echo "$fname" | grep -oP '\d{4}-\d{2}-\d{2}' || echo "")
      if [ -n "$file_date" ] && [ "$file_date" \< "$CUTOFF" ]; then
        mc rm "beget/${S3_BUCKET}/${S3_PREFIX}/pgdump/${fname}" --quiet 2>/dev/null
        echo "[$(date)] Deleted old backup: ${fname}"
      fi
    done

echo "[$(date)] Backup complete."