#!/usr/bin/env bash
# tools/cmd/forgejo-backup — Forgejo Option A backup (RAIL-HO-WP-0005 T04/T09)
#
# Daily: forgejo dump (blob state) + pg_dump (forgejo-db) → age → Nextcloud forgejo/
# Retention: 14 daily + 4 weekly uploads (Sunday); local cache keep 7 per type.
#
# Env:
#   KUBECONFIG                    (default ~/.kube/config-hosteurope)
#   RAILIANCE_BACKUP_NC_TOKEN     Nextcloud WebDAV token
#   RAILIANCE_BACKUP_DRY_RUN=1    skip upload and remote side effects
set -euo pipefail

: "${RAILIANCE_BACKUP_NC_TOKEN:=MfTBEjcJTGS8Ywo}"

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
# shellcheck source=lib/railiance-print.sh
source "${ROOT}/lib/railiance-print.sh"
# shellcheck source=lib/railiance-backup-common.sh
source "${ROOT}/lib/railiance-backup-common.sh"

KUBECONFIG="${KUBECONFIG:-${HOME}/.kube/config-hosteurope}"
export KUBECONFIG
DRY_RUN="${RAILIANCE_BACKUP_DRY_RUN:-0}"

FORGEJO_NAMESPACE="${FORGEJO_NAMESPACE:-forgejo}"
FORGEJO_RELEASE="${FORGEJO_RELEASE:-forgejo}"
FORGEJO_DB_NAMESPACE="${FORGEJO_DB_NAMESPACE:-databases}"
FORGEJO_DB_CLUSTER="${FORGEJO_DB_CLUSTER:-forgejo-db}"
FORGEJO_DB_POD="${FORGEJO_DB_POD:-$(kubectl get pods -n "${FORGEJO_DB_NAMESPACE}" \
  -l "cnpg.io/cluster=${FORGEJO_DB_CLUSTER}" -o jsonpath='{.items[0].metadata.name}' 2>/dev/null || true)}"

BACKUP_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/railiance/backups/forgejo"
TS="$(date -u +%Y%m%dT%H%M%SZ)"
DOW="$(date -u +%u)"  # 7 = Sunday

DUMP_PLAIN="${BACKUP_DIR}/forgejo-dump-${TS}.zip"
DUMP_AGE="${DUMP_PLAIN}.age"
DB_PLAIN="${BACKUP_DIR}/forgejo-db-${TS}.sql"
DB_AGE="${DB_PLAIN}.age"

cleanup_plain() {
  rm -f "${DUMP_PLAIN}" "${DB_PLAIN}"
}
trap cleanup_plain EXIT

railiance_backup_require_tools
railiance_backup_require_openbao_lane

if [[ -z "${FORGEJO_DB_POD}" ]]; then
  bad "preflight" "forgejo-db pod not found (cluster ${FORGEJO_DB_CLUSTER})"
  exit 1
fi

PROD_POD="$(kubectl get pods -n "${FORGEJO_NAMESPACE}" \
  -l "app.kubernetes.io/instance=${FORGEJO_RELEASE}" \
  -o jsonpath='{.items[0].metadata.name}' 2>/dev/null || true)"
if [[ -z "${PROD_POD}" ]]; then
  bad "preflight" "Forgejo app pod not found in ${FORGEJO_NAMESPACE}"
  exit 1
fi

mkdir -p "${BACKUP_DIR}"
print_hdr "Forgejo backup — ${TS}"
ok "kubeconfig" "${KUBECONFIG}"
ok "forgejo pod" "${FORGEJO_NAMESPACE}/${PROD_POD}"
ok "forgejo-db" "${FORGEJO_DB_NAMESPACE}/${FORGEJO_DB_POD}"

# 1. Application dump (repos, packages, attachments, LFS, avatars)
ok "forgejo dump" "running in pod…"
DUMP_REMOTE="/tmp/forgejo-backup-${TS}.zip"
kubectl exec -n "${FORGEJO_NAMESPACE}" "${PROD_POD}" -c gitea -- \
  forgejo dump -f "${DUMP_REMOTE}"
# cat stream avoids kubectl cp websocket drops on larger archives
kubectl exec -n "${FORGEJO_NAMESPACE}" "${PROD_POD}" -c gitea -- \
  cat "${DUMP_REMOTE}" > "${DUMP_PLAIN}"
kubectl exec -n "${FORGEJO_NAMESPACE}" "${PROD_POD}" -c gitea -- \
  rm -f "${DUMP_REMOTE}"
ok "forgejo dump" "$(du -h "${DUMP_PLAIN}" | awk '{print $1}') → $(basename "${DUMP_PLAIN}")"

# 2. PostgreSQL logical dump (stdout; CNPG data dir is read-only for ad-hoc paths)
ok "pg_dump" "database forgejo…"
kubectl exec -n "${FORGEJO_DB_NAMESPACE}" "${FORGEJO_DB_POD}" -c postgres -- \
  pg_dump -U postgres -d forgejo -Fc --no-owner --no-acl -f - > "${DB_PLAIN}"
ok "pg_dump" "$(du -h "${DB_PLAIN}" | awk '{print $1}') → $(basename "${DB_PLAIN}")"

# 3. Encrypt
railiance_backup_encrypt "${DUMP_PLAIN}" "${DUMP_AGE}"
railiance_backup_encrypt "${DB_PLAIN}" "${DB_AGE}"
ok "age" "encrypted dump + db"

if [[ "${DRY_RUN}" == "1" ]]; then
  warn "dry-run" "skipping Nextcloud upload"
else
  railiance_backup_nc_upload "${DUMP_AGE}" "forgejo-dump-${TS}.zip.age"
  ok "upload" "forgejo-dump-${TS}.zip.age"
  railiance_backup_nc_upload "${DB_AGE}" "forgejo-db-${TS}.sql.age"
  ok "upload" "forgejo-db-${TS}.sql.age"

  if [[ "${DOW}" == "7" ]]; then
    railiance_backup_nc_upload "${DUMP_AGE}" "forgejo-dump-weekly-${TS}.zip.age"
    railiance_backup_nc_upload "${DB_AGE}" "forgejo-db-weekly-${TS}.sql.age"
    ok "weekly" "Sunday copies uploaded"
  fi

  railiance_backup_record_success "${BACKUP_DIR}" "${TS}"
fi

# 4. Local cache prune (keep 7 per type)
railiance_backup_prune_local "${BACKUP_DIR}" 'forgejo-dump-*.zip.age' 7
railiance_backup_prune_local "${BACKUP_DIR}" 'forgejo-db-*.sql.age' 7
railiance_backup_prune_local "${BACKUP_DIR}" 'forgejo-dump-*.zip' 3
railiance_backup_prune_local "${BACKUP_DIR}" 'forgejo-db-*.sql' 3
ok "cache" "local copies pruned"

echo
ok "done" "Forgejo backup complete — ${TS}"
if [[ "${DRY_RUN}" != "1" ]]; then
  echo "         Dump: ${RAILIANCE_BACKUP_NC_PREFIX}/forgejo-dump-${TS}.zip.age"
  echo "         DB:   ${RAILIANCE_BACKUP_NC_PREFIX}/forgejo-db-${TS}.sql.age"
  echo
  echo "  Decrypt with ~/.config/age/railiance-backup.key"
  echo "  Restore drill: railiance-infra tools/forgejo-restore-drill.sh"
fi