#!/bin/bash
# Methods library for lemmy — sourced by install-lemmy.sh and generated run-*.sh scripts.
# SCRIPT_DIR must be set before sourcing.

_kubectl() {
  if command -v kubectl >/dev/null 2>&1; then
    command kubectl "$@"
  elif command -v k0s >/dev/null 2>&1; then
    k0s kubectl "$@"
  else
    echo "ERROR: no kubectl or k0s binary found" >&2; exit 127
  fi
}

_require_env() {
  local var="$1"
  if [ -z "${!var:-}" ]; then
    echo "ERROR: required variable $var is not set" >&2; exit 1
  fi
}

_wait_for_pod() {
  local timeout="${1:-300}"
  # Wait for lemmy-proxy (nginx) — the external-facing deployment
  _kubectl wait pod \
    --namespace "$LEMMY_NAMESPACE" \
    --selector "app.kubernetes.io/name=lemmy-proxy" \
    --for=condition=Ready \
    --timeout="${timeout}s"
}

_pg_namespace() { echo "core-data"; }

_pg_pod() {
  _kubectl get pod --namespace "$(_pg_namespace)" \
    --selector "app.kubernetes.io/name=postgresql" \
    -o jsonpath='{.items[0].metadata.name}' 2>/dev/null
}

# ── Manifest plan helpers ─────────────────────────────────────────────────────

_plan_apply() {
  local file="$1"
  local path="$SCRIPT_DIR/manifests/${file}.yaml"
  [ -f "$path" ] || { echo "  [skip] ${file}.yaml not in manifests/"; return 0; }
  _kubectl apply -f "$path"
}

_plan_apply_skip() {
  local file="$1"
  local path="$SCRIPT_DIR/manifests/${file}.yaml"
  [ -f "$path" ] || { echo "  [skip] ${file}.yaml not in manifests/"; return 0; }
  if _kubectl get -f "$path" >/dev/null 2>&1; then
    echo "  [skip] ${file} already exists in cluster"
    return 0
  fi
  _kubectl apply -f "$path"
}

_plan_rollout_restart() {
  local file="$1"
  local path="$SCRIPT_DIR/manifests/${file}.yaml"
  [ -f "$path" ] || { echo "  [skip] ${file}.yaml not in manifests/"; return 0; }
  _kubectl rollout restart -f "$path"
}

_plan_delete() {
  local file="$1"
  local path="$SCRIPT_DIR/manifests/${file}.yaml"
  [ -f "$path" ] || { echo "  [skip] ${file}.yaml not in manifests/"; return 0; }
  _kubectl delete -f "$path" --ignore-not-found
}

# shellcheck source=lib/gateway-tls.sh
source "${SCRIPT_DIR}/lib/gateway-tls.sh"

_method_patch-gateway-https() {
  _lib_gateway_patch_https \
    "${TLS_HOOK_GATEWAY_NAME:-libre-wuji}" \
    "${TLS_HOOK_GATEWAY_NS:-kube-system}" \
    "${TLS_HOOK_LISTENER_NAME}" \
    "${TLS_HOOK_DOMAIN}" \
    "${TLS_HOOK_TLS_SECRET}" \
    "${TLS_HOOK_NAMESPACE}"
}

_method_remove-gateway-https() {
  _lib_gateway_remove_https \
    "${TLS_HOOK_GATEWAY_NAME:-libre-wuji}" \
    "${TLS_HOOK_GATEWAY_NS:-kube-system}" \
    "${TLS_HOOK_LISTENER_NAME}"
}

# ── Component methods ─────────────────────────────────────────────────────────

_method_create-credentials() {
  [ -f "${SCRIPT_DIR}/_credentials.env" ] && set -a && source "${SCRIPT_DIR}/_credentials.env" && set +a
  _require_env LEMMY_DB_PASSWORD
  _require_env LEMMY_ADMIN_PASSWORD
  _require_env PICTRS_API_KEY

  _kubectl create secret generic "${LEMMY_NAME}-credentials" \
    --namespace "$LEMMY_NAMESPACE" \
    --from-literal=LEMMY_DB_PASSWORD="$LEMMY_DB_PASSWORD" \
    --from-literal=LEMMY_ADMIN_PASSWORD="$LEMMY_ADMIN_PASSWORD" \
    --from-literal=PICTRS_API_KEY="$PICTRS_API_KEY" \
    --dry-run=client -o yaml | _kubectl apply -f -
  echo "  [ok] credentials secret '${LEMMY_NAME}-credentials' created in ${LEMMY_NAMESPACE}"
}

_method_init-db() {
  [ -f "${SCRIPT_DIR}/_credentials.env" ] && set -a && source "${SCRIPT_DIR}/_credentials.env" && set +a
  _require_env LEMMY_DB_PASSWORD

  local pg_ns pg_pod db_user safe_pw safe_usr safe_db
  pg_ns=$(_pg_namespace)
  pg_pod=$(_pg_pod)
  [ -z "$pg_pod" ] && { echo "  [error] no postgresql pod found in namespace $pg_ns" >&2; exit 1; }

  db_user="${LEMMY_DB_USER:-lemmy}"
  safe_pw="${LEMMY_DB_PASSWORD//\'/\'\'}"
  safe_usr="${db_user//\'/\'\'}"
  safe_db="${LEMMY_DB_NAME:-lemmy}"
  safe_db="${safe_db//\'/\'\'}"

  _kubectl exec -i --namespace "$pg_ns" "$pg_pod" -- psql -U postgres <<SQL
DO \$\$
DECLARE
  pw  text := '${safe_pw}';
  usr text := '${safe_usr}';
BEGIN
  IF NOT EXISTS (SELECT FROM pg_roles WHERE rolname = usr) THEN
    EXECUTE format('CREATE ROLE %I WITH LOGIN PASSWORD %L', usr, pw);
    RAISE NOTICE 'role % created', usr;
  ELSE
    EXECUTE format('ALTER ROLE %I WITH PASSWORD %L', usr, pw);
    RAISE NOTICE 'role % password updated', usr;
  END IF;
END;
\$\$;
SQL

  local db_exists
  db_exists=$(_kubectl exec --namespace "$pg_ns" "$pg_pod" -- \
    psql -U postgres -tAc \
    "SELECT 1 FROM pg_database WHERE datname = '${safe_db}'" 2>/dev/null || true)

  if [ "${db_exists}" != "1" ]; then
    _kubectl exec --namespace "$pg_ns" "$pg_pod" -- \
      psql -U postgres -c \
      "CREATE DATABASE \"${safe_db}\"
       WITH OWNER \"${safe_usr}\"
       ENCODING 'UTF8'
       LC_COLLATE 'C'
       LC_CTYPE 'C'
       TEMPLATE template0"
    echo "  [ok] database '${safe_db}' created"
  else
    echo "  [skip] database '${safe_db}' already exists"
  fi

  _kubectl exec --namespace "$pg_ns" "$pg_pod" -- \
    psql -U postgres -d "${safe_db}" -c \
    "GRANT ALL ON SCHEMA public TO \"${safe_usr}\""
  echo "  [ok] postgresql role '${safe_usr}' and database '${safe_db}' ensured"
}

_method_create-configmaps() {
  [ -f "${SCRIPT_DIR}/_credentials.env" ] && set -a && source "${SCRIPT_DIR}/_credentials.env" && set +a
  _require_env LEMMY_DB_PASSWORD
  _require_env PICTRS_API_KEY

  local db_host="${LEMMY_DB_HOST:-}"
  local db_port="${LEMMY_DB_PORT:-5432}"
  local db_user="${LEMMY_DB_USER:-lemmy}"
  local db_name="${LEMMY_DB_NAME:-lemmy}"
  local ns="${LEMMY_NAMESPACE:-lemmy}"
  local domain="${LEMMY_DOMAIN:-}"

  local hjson
  hjson=$(cat <<HJSON
{
  database: {
    uri: "postgresql://${db_user}:${LEMMY_DB_PASSWORD}@${db_host}:${db_port}/${db_name}"
  }
  hostname: "${domain}"
  bind: "0.0.0.0"
  port: 8536
  tls_enabled: true
  pictrs: {
    url: "http://lemmy-pictrs.${ns}.svc.libre-wuji.local:8080/"
    api_key: "${PICTRS_API_KEY}"
  }
  email: {
    smtp_server: "mail.librecloud.online:587"
    smtp_from_address: "lemmy@librecloud.online"
    tls_type: "starttls"
  }
}
HJSON
)

  _kubectl create configmap "${LEMMY_NAME}-config" \
    --namespace "$ns" \
    --from-literal="config.hjson=${hjson}" \
    --dry-run=client -o yaml | _kubectl apply -f -
  echo "  [ok] lemmy-config ConfigMap created with credentials in ${ns}"
}

_method_wait-pictrs() {
  echo "  waiting for pictrs pod to be ready..."
  _kubectl wait pod \
    --namespace "$LEMMY_NAMESPACE" \
    --selector "app.kubernetes.io/name=lemmy-pictrs" \
    --for=condition=Ready \
    --timeout=120s
  echo "  [ok] pictrs ready"
}

_method_wait-lemmy() {
  echo "  waiting for lemmy backend pod to be ready..."
  _kubectl wait pod \
    --namespace "$LEMMY_NAMESPACE" \
    --selector "app.kubernetes.io/name=lemmy-backend" \
    --for=condition=Ready \
    --timeout=180s
  echo "  [ok] lemmy backend ready"
}

_method_wait-ready() {
  _wait_for_pod 300
}

_method_protect-volume() {
  local pvc="${PLAN_PARAM_PVC:-lemmy-pictrs-data}"

  echo "  waiting for PVC '${pvc}' to bind..."
  _kubectl wait pvc "$pvc" \
    --namespace "$LEMMY_NAMESPACE" \
    --for=jsonpath='{.status.phase}'=Bound \
    --timeout=120s

  local pv_name
  pv_name=$(_kubectl get pvc "$pvc" \
    --namespace "$LEMMY_NAMESPACE" \
    -o jsonpath='{.spec.volumeName}')
  if [ -z "$pv_name" ]; then
    echo "  [warn] could not resolve PV name for PVC '${pvc}' — skipping volume protection"
    return 0
  fi

  if command -v hcloud >/dev/null 2>&1; then
    hcloud volume enable-protection "$pv_name" delete 2>/dev/null \
      && echo "  [ok] volume '${pv_name}' protected" \
      || echo "  [warn] hcloud protect failed — run manually: hcloud volume enable-protection ${pv_name} delete"
  else
    echo "  [warn] hcloud CLI not found — skip volume protection for '${pv_name}'"
  fi
}