#!/usr/bin/env bash

set -euo pipefail

# init_primary_domain.sh
# Purpose:
# - Deploy OpenBao to Kubernetes (dev mode) and store admin ed25519 key pair
# Generate and apply a Kerberos krb5.conf ConfigMap for an external realm
# - Local Docker helpers for OpenBao (optional)

# Initialize SCRIPT_DIR
SCRIPT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)

# Preserve positional args while sourcing env
__PROLE_SAVED_ARGS=("$@")
if [[ -n "${PROLE_HOME:-}" && -f "$PROLE_HOME/env.sh" ]]; then
  set --
  # shellcheck disable=SC1090
  source "$PROLE_HOME/env.sh"
elif [[ -f "$HOME/.prole/env.sh" ]]; then
  set --
  # shellcheck disable=SC1090
  source "$HOME/.prole/env.sh"
fi
set -- "${__PROLE_SAVED_ARGS[@]}"
unset __PROLE_SAVED_ARGS

if [[ -z "${PROLE_SERVICE:-}" ]]; then
  echo "ERROR: PROLE_SERVICE is not defined in env. Provide PROLE_HOME/env.sh or ~/.prole/env.sh" >&2
  exit 1
fi

ACTION=${1:-}

# Defaults
NAMESPACE=${NAMESPACE:-default}
OPENBAO_NAME=${OPENBAO_NAME:-openbao}
OPENBAO_IMAGE=${OPENBAO_IMAGE:-ghcr.io/openbao/openbao:latest}
OPENBAO_MANIFEST_DIR="$SCRIPT_DIR/../k8s/openbao"

# Kerberos realm defaults
KRB5_REALM=${KRB5_REALM:-PROLE.ORG}
DOMAIN=${DOMAIN:-$(echo "$KRB5_REALM" | tr 'A-Z' 'a-z')}
KRB5_KDC=${KRB5_KDC:-kdc.$DOMAIN}
KRB5_ADMIN=${KRB5_ADMIN:-}

# Secrets and token locations
SECRETS_DIR="$PROLE_SERVICE/secrets"
mkdir -p "$SECRETS_DIR"
admin_key_priv="$SECRETS_DIR/admin_ed25519.key"
admin_key_pub="$SECRETS_DIR/admin_ed25519.pub"
root_token_file="$SECRETS_DIR/openbao-root-token"

ensure_tools() {
  for t in kubectl curl openssl base64; do
    command -v "$t" >/dev/null || { echo "Missing required tool: $t" >&2; exit 1; }
  done
}

ensure_docker() {
  command -v docker >/dev/null || { echo "Missing required tool: docker" >&2; exit 1; }
}

ensure_admin_keypair() {
  # Ensure admin ed25519 keypair exists and a root token is available
  mkdir -p "$SECRETS_DIR"
  if [[ ! -f "$admin_key_priv" || ! -f "$admin_key_pub" ]]; then
    echo "Generating admin ed25519 keypair in $SECRETS_DIR ..."
    openssl genpkey -algorithm ED25519 -out "$admin_key_priv"
    openssl pkey -in "$admin_key_priv" -pubout -out "$admin_key_pub"
    chmod 0600 "$admin_key_priv"
  fi
  # Ensure a root token exists for OpenBao dev server interactions
  if [[ ! -f "$root_token_file" || ! -s "$root_token_file" ]]; then
    openssl rand -hex 24 >"$root_token_file"
    chmod 0600 "$root_token_file"
  fi
}

generate_openbao_manifests() {
  mkdir -p "$OPENBAO_MANIFEST_DIR"
  # Only create a simple deployment if none exists; otherwise respect current file
  local deploy="$OPENBAO_MANIFEST_DIR/deployment.yaml"
  if [[ ! -f "$deploy" ]]; then
    cat >"$deploy" <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: $OPENBAO_NAME
  namespace: $NAMESPACE
spec:
  replicas: 1
  selector:
    matchLabels:
      app: $OPENBAO_NAME
  template:
    metadata:
      labels:
        app: $OPENBAO_NAME
    spec:
      containers:
      - name: $OPENBAO_NAME
        image: $OPENBAO_IMAGE
        args: ["server","-dev","-dev-listen-address=0.0.0.0:8200"]
        ports:
        - containerPort: 8200
---
apiVersion: v1
kind: Service
metadata:
  name: $OPENBAO_NAME
  namespace: $NAMESPACE
spec:
  selector:
    app: $OPENBAO_NAME
  ports:
  - name: http
    port: 8200
    targetPort: 8200
EOF
  fi
}

generate_kerberos_configmap() {
  mkdir -p "$OPENBAO_MANIFEST_DIR"
  local domain_lower
  domain_lower=$(echo "$DOMAIN" | tr 'A-Z' 'a-z')

  # Split KRB5_KDC on comma into bash array
  local IFS=','
  read -r -a __kdcs <<< "$KRB5_KDC"
  local kdc_lines=""
  local kdc
  for kdc in "${__kdcs[@]}"; do
    kdc_lines+=$'        kdc = '"$kdc"$'\n'
  done
  local admin_server admin_line
  admin_server=${KRB5_ADMIN:-"${__kdcs[0]:-}"}
  admin_line=""
  if [[ -n "$admin_server" ]]; then
    # 8 spaces to remain within the YAML literal block indentation
    admin_line=$'        admin_server = '"$admin_server"$'\n'
  fi

  cat >"$OPENBAO_MANIFEST_DIR/kerberos-configmap.yaml" <<EOF
apiVersion: v1
kind: ConfigMap
metadata:
  name: prole-krb5-conf
  namespace: $NAMESPACE
data:
  krb5.conf: |
    [libdefaults]
      default_realm = $KRB5_REALM
      dns_lookup_realm = true
      dns_lookup_kdc = true

    [realms]
      $KRB5_REALM = {
${kdc_lines}${admin_line}      }

    [domain_realm]
      .$domain_lower = $KRB5_REALM
      $domain_lower = $KRB5_REALM
EOF
}

apply_k8s() {
  echo "Applying OpenBao manifest to namespace '$NAMESPACE' ..."
  kubectl apply -f "$OPENBAO_MANIFEST_DIR/deployment.yaml"
  echo "Applying Kerberos ConfigMap (external realm) to namespace '$NAMESPACE' ..."
  kubectl apply -f "$OPENBAO_MANIFEST_DIR/kerberos-configmap.yaml"
}

wait_for_openbao() {
  echo "Waiting for OpenBao to become ready ..."
  kubectl rollout status deploy/$OPENBAO_NAME -n "$NAMESPACE" --timeout=120s
}

init_openbao_kv_and_store_admin_key() {
  local token
  token=$(cat "$root_token_file")
  # Enable kv (if not already) and write keys
  local svc="http://127.0.0.1:18200"
  echo "Configuring KV at $svc ..."
  curl -sS -H "X-Vault-Token: $token" -X POST "$svc/v1/sys/mounts/kv" \
    -d '{"type":"kv","options":{"version":"2"}}' || true
  echo "Writing admin key pair to kv/prole/admin ..."
  local priv pub
  priv=$(base64 <"$admin_key_priv" | tr -d '\n')
  pub=$(base64 <"$admin_key_pub" | tr -d '\n')
  curl -sS -H "X-Vault-Token: $token" -H 'Content-Type: application/json' \
    -X POST "$svc/v1/kv/data/prole/admin" \
    -d "{\"data\":{\"admin_private_key_b64\":\"$priv\",\"admin_public_key_b64\":\"$pub\"}}" >/dev/null
  echo "Stored admin key pair in OpenBao kv/prole/admin."
}

# Removed: prompt_admin_password_and_apply_secret (no AD admin secret required)

docker_start() {
  echo "Starting local Docker container for OpenBao ..."
  ensure_docker
  docker rm -f "$OPENBAO_NAME" >/dev/null 2>&1 || true
  # OpenBao dev
  local token
  token=$(cat "$root_token_file" 2>/dev/null || true)
  if [[ -z "$token" ]]; then
    token=$(openssl rand -hex 24)
    printf "%s" "$token" >"$root_token_file"
    chmod 0600 "$root_token_file"
  fi
  docker run -d --name "$OPENBAO_NAME" -p 18200:8200 \
    "$OPENBAO_IMAGE" server -dev -dev-listen-address=0.0.0.0:8200 -dev-root-token-id="$token"
  echo "Docker container started: $OPENBAO_NAME"
}

docker_stop() {
  docker rm -f "$OPENBAO_NAME" >/dev/null 2>&1 || true
  echo "Stopped OpenBao container if it was running."
}

docker_restart() {
  docker_stop
  docker_start
}

# status command implementation wrapped in a function to avoid top-level 'local'
cmd_status() {
  echo "--- init_primary_domain status ---"
  echo "Namespace: $NAMESPACE"
  echo "OpenBao name: $OPENBAO_NAME"
  echo "Manifest dir: $OPENBAO_MANIFEST_DIR"

  # Files/manifests present
  local ok=0
  if [[ -f "$OPENBAO_MANIFEST_DIR/deployment.yaml" ]]; then
    echo "[OK] OpenBao deployment manifest exists"
  else
    echo "[MISSING] $OPENBAO_MANIFEST_DIR/deployment.yaml"
    ok=1
  fi
  if [[ -f "$OPENBAO_MANIFEST_DIR/kerberos-configmap.yaml" ]]; then
    echo "[OK] Kerberos ConfigMap manifest exists"
  else
    echo "[MISSING] $OPENBAO_MANIFEST_DIR/kerberos-configmap.yaml"
    ok=1
  fi

  # K8s resources
  if kubectl -n "$NAMESPACE" get deploy "$OPENBAO_NAME" >/dev/null 2>&1; then
    # Get readiness
    local ready desired
    ready=$(kubectl -n "$NAMESPACE" get deploy "$OPENBAO_NAME" -o jsonpath='{.status.readyReplicas}' 2>/dev/null || echo "0")
    desired=$(kubectl -n "$NAMESPACE" get deploy "$OPENBAO_NAME" -o jsonpath='{.status.replicas}' 2>/dev/null || echo "0")
    ready=${ready:-0}
    desired=${desired:-0}
    if [[ "$ready" == "$desired" && "$ready" != "0" ]]; then
      echo "[OK] OpenBao Deployment running ($ready/$desired ready)"
    else
      echo "[WARN] OpenBao Deployment not fully ready ($ready/$desired)"
      ok=1
    fi
  else
    echo "[MISSING] OpenBao Deployment '$OPENBAO_NAME' in namespace '$NAMESPACE'"
    ok=1
  fi

  if kubectl -n "$NAMESPACE" get configmap prole-krb5-conf >/dev/null 2>&1; then
    echo "[OK] Kerberos ConfigMap 'prole-krb5-conf' present"
  else
    echo "[MISSING] Kerberos ConfigMap 'prole-krb5-conf' in namespace '$NAMESPACE'"
    ok=1
  fi

  # Docker (optional local mode)
  if command -v docker >/dev/null 2>&1; then
    if docker ps --format '{{.Names}}' | grep -Fxq "$OPENBAO_NAME"; then
      echo "[OK] Docker container '$OPENBAO_NAME' is running"
    else
      # Not necessarily an error; we primarily use k8s
      echo "[INFO] Docker container '$OPENBAO_NAME' not running (k8s mode may be in use)"
    fi
  fi

  # Secrets and tokens
  if [[ -f "$admin_key_priv" && -f "$admin_key_pub" ]]; then
    echo "[OK] Admin ed25519 keypair present in $SECRETS_DIR"
  else
    echo "[MISSING] Admin keypair files in $SECRETS_DIR"
    ok=1
  fi
  if [[ -s "$root_token_file" ]]; then
    echo "[OK] OpenBao root token file present"
  else
    echo "[MISSING] OpenBao root token file ($root_token_file)"
    ok=1
  fi

  # OpenBao reachability and token validity (best-effort)
  # Prefer explicit override, then localhost port-forward, then cluster DNS
  local svc_url
  if [[ -n "${PROLE_OPENBAO_URL:-}" ]]; then
    svc_url="$PROLE_OPENBAO_URL"
  elif curl -sS "http://127.0.0.1:18200/v1/sys/health" >/dev/null 2>&1; then
    svc_url="http://127.0.0.1:18200"
  else
    svc_url="http://$OPENBAO_NAME.$NAMESPACE.svc.cluster.local:8200"
  fi
  if curl -sS "$svc_url/v1/sys/health" >/dev/null 2>&1; then
    echo "[OK] OpenBao service reachable"
    if [[ -s "$root_token_file" ]]; then
      local code
      code=$(curl -s -o /dev/null -w "%{http_code}" -H "X-Vault-Token: $(cat "$root_token_file")" "$svc_url/v1/sys/mounts" || echo "000")
      if [[ "$code" == "200" ]]; then
        echo "[OK] OpenBao root token authenticates"
      else
        echo "[WARN] OpenBao root token did not authenticate (HTTP $code)"
        ok=1
      fi
    fi
  else
    echo "[WARN] OpenBao service not reachable at $svc_url"
    ok=1
  fi

  # Service certificate existence (CNPG TLS)
  local CNPG_CLUSTER_NAME
  CNPG_CLUSTER_NAME=${CNPG_CLUSTER_NAME:-prole-db}
  if kubectl -n "$NAMESPACE" get secret "${CNPG_CLUSTER_NAME}-tls" >/dev/null 2>&1; then
    echo "[OK] Service certificate secret '${CNPG_CLUSTER_NAME}-tls' exists"
  else
    echo "[INFO] Service certificate secret '${CNPG_CLUSTER_NAME}-tls' not found"
  fi

  echo "-------------------------------------"
  if [[ $ok -eq 0 ]]; then
    echo "Status: OK"
    return 0
  else
    echo "Status: Issues detected"
    return 1
  fi
}

case "$ACTION" in
  start)
    ensure_tools
    ensure_docker
    ensure_admin_keypair
    docker_start
    ;;
  status)
    ensure_tools
    cmd_status
    ;;
  stop)
    ensure_docker
    docker_stop
    ;;
  restart)
    ensure_tools
    ensure_docker
    ensure_admin_keypair
    docker_restart
    ;;
  initialize)
    ensure_tools
    # Read password from stdin if provided
    local db_pass=""
    if [[ ! -t 0 ]]; then
      read -r db_pass
    fi

    ensure_admin_keypair
    generate_openbao_manifests
    generate_kerberos_configmap
    apply_k8s
    
    if [[ -n "$db_pass" ]]; then
      echo "Creating database user secret 'prole-db-user' ..."
      kubectl create secret generic prole-db-user -n "$NAMESPACE" \
        --from-literal=username=prole \
        --from-literal=password="$db_pass" \
        --dry-run=client -o yaml | kubectl apply -f -
    fi

    wait_for_openbao
      # Expect a persistent port-forward to be managed by etc/init_port_forwards.sh
      if ! curl -sS http://127.0.0.1:18200/v1/sys/health >/dev/null 2>&1; then
        echo "ERROR: OpenBao not reachable at http://127.0.0.1:18200." >&2
        echo "Please start port-forwards: $PROLE_HOME/etc/init_port_forwards.sh start" >&2
        exit 1
      fi
      init_openbao_kv_and_store_admin_key
      echo "Initialization complete. Manifests in: $OPENBAO_MANIFEST_DIR"
    ;;
  update|reload)
    generate_openbao_manifests
    generate_kerberos_configmap
    kubectl apply -f "$OPENBAO_MANIFEST_DIR/deployment.yaml"
    kubectl apply -f "$OPENBAO_MANIFEST_DIR/kerberos-configmap.yaml"
    echo "Re-applied manifests."
    ;;
  *)
    echo "Usage: $0 {start|stop|status|restart|initialize|update|reload}" >&2
    exit 2
    ;;
esac