#!/usr/bin/env sh
set -eu

COMPOSE_FILE="${COMPOSE_FILE:-docker-compose.production.yml}"
ENV_FILE="${ENV_FILE:-.env.production}"
BACKUP_DIR="${BACKUP_DIR:-./data/backups}"
RETENTION_DAYS="${BACKUP_RETENTION_DAYS:-14}"
SYNOLOGY_BACKUP_DIR="${SYNOLOGY_BACKUP_DIR:-}"

timestamp="$(date -u +%Y%m%d-%H%M%S)"
postgres_file="postgres-${timestamp}.dump"
uploads_file="uploads-${timestamp}.tar.gz"
config_file="config-${timestamp}.tar.gz"
manifest_file="backup-${timestamp}.manifest"

mkdir -p "${BACKUP_DIR}"

docker compose --env-file "${ENV_FILE}" -f "${COMPOSE_FILE}" exec -T postgres sh -lc \
  "PGPASSWORD=\"\$POSTGRES_PASSWORD\" pg_dump -U \"\$POSTGRES_USER\" -d \"\$POSTGRES_DB\" -Fc" \
  > "${BACKUP_DIR}/${postgres_file}"

docker compose --env-file "${ENV_FILE}" -f "${COMPOSE_FILE}" run --rm --no-deps --entrypoint sh app -lc \
  "tar -C /app/uploads -czf - ." \
  > "${BACKUP_DIR}/${uploads_file}"

tar -C . -czf "${BACKUP_DIR}/${config_file}" \
  "${ENV_FILE}" \
  "${COMPOSE_FILE}" \
  deploy/cloudflared/config.yml

cat > "${BACKUP_DIR}/${manifest_file}" <<EOF
created_at_utc=${timestamp}
postgres_dump=${postgres_file}
uploads_archive=${uploads_file}
config_archive=${config_file}
compose_file=${COMPOSE_FILE}
env_file=${ENV_FILE}
EOF

find "${BACKUP_DIR}" -type f \( \
  -name 'postgres-*.dump' -o \
  -name 'uploads-*.tar.gz' -o \
  -name 'config-*.tar.gz' -o \
  -name 'backup-*.manifest' \
\) -mtime +"${RETENTION_DAYS}" -delete

if [ -n "${SYNOLOGY_BACKUP_DIR}" ]; then
  mkdir -p "${SYNOLOGY_BACKUP_DIR}"
  cp "${BACKUP_DIR}/${postgres_file}" "${SYNOLOGY_BACKUP_DIR}/${postgres_file}"
  cp "${BACKUP_DIR}/${uploads_file}" "${SYNOLOGY_BACKUP_DIR}/${uploads_file}"
  cp "${BACKUP_DIR}/${config_file}" "${SYNOLOGY_BACKUP_DIR}/${config_file}"
  cp "${BACKUP_DIR}/${manifest_file}" "${SYNOLOGY_BACKUP_DIR}/${manifest_file}"
fi

echo "Created backup set:"
echo "  ${BACKUP_DIR}/${postgres_file}"
echo "  ${BACKUP_DIR}/${uploads_file}"
echo "  ${BACKUP_DIR}/${config_file}"
echo "  ${BACKUP_DIR}/${manifest_file}"