/**
 * Alerting option lists derived from the OpenAPI schema.
 *
 * Why this module exists: option arrays in condition-form components used to
 * be hand-typed string literals, and they drifted silently from the backend
 * enums (e.g. P95_LATENCY_MS appeared in the dropdown without a matching
 * backend value; LATEST was exposed by the backend but never surfaced in the
 * UI). Every dropdown value here is derived from a schema.d.ts union type and
 * every label is required via `Record<T, string>` — TypeScript will refuse to
 * compile if the backend adds or removes a value and this file isn't updated.
 *
 * Workflow when an alerting enum changes on the backend:
 *   1. `cd ui && npm run generate-api:live` (or `generate-api` after deploy).
 *   2. The `Record<…, string>` maps below fail to type-check for any new or
 *      removed value. Fix the map.
 *   3. Every consumer (`METRIC_OPTIONS`, …) regenerates automatically.
 *
 * Fields whose backend type is `String` rather than a typed enum (agent state,
 * log level, deployment states, exchange filter status, JVM metric names)
 * cannot be derived here today — springdoc emits them as open-ended strings.
 * Follow-up: add `@Schema(allowableValues = …)` on the relevant Java record
 * components so they land in schema.d.ts as unions, then fold them in here.
 */
import type { components } from './schema';

type AlertRuleRequest          = components['schemas']['AlertRuleRequest'];
type RouteMetricCondition      = components['schemas']['RouteMetricCondition'];
type JvmMetricCondition        = components['schemas']['JvmMetricCondition'];
type ExchangeMatchCondition    = components['schemas']['ExchangeMatchCondition'];
type AlertRuleTarget           = components['schemas']['AlertRuleTarget'];

export type ConditionKind      = NonNullable<AlertRuleRequest['conditionKind']>;
export type Severity           = NonNullable<AlertRuleRequest['severity']>;
export type RouteMetric        = NonNullable<RouteMetricCondition['metric']>;
export type Comparator         = NonNullable<RouteMetricCondition['comparator']>;
export type JvmAggregation     = NonNullable<JvmMetricCondition['aggregation']>;
export type ExchangeFireMode   = NonNullable<ExchangeMatchCondition['fireMode']>;
export type TargetKind         = NonNullable<AlertRuleTarget['kind']>;

export interface Option<T extends string> { value: T; label: string }

function toOptions<T extends string>(labels: Record<T, string>): Option<T>[] {
  return (Object.keys(labels) as T[]).map((value) => ({ value, label: labels[value] }));
}

// ---------------------------------------------------------------------------
// Label maps — one entry per backend value, TypeScript enforces exhaustiveness.
// ---------------------------------------------------------------------------

const CONDITION_KIND_LABELS: Record<ConditionKind, string> = {
  ROUTE_METRIC:     'Route metric (error rate, latency, throughput)',
  EXCHANGE_MATCH:   'Exchange match (specific failures)',
  AGENT_STATE:      'Agent state (DEAD / STALE)',
  DEPLOYMENT_STATE: 'Deployment state (FAILED / DEGRADED)',
  LOG_PATTERN:      'Log pattern (count of matching logs)',
  JVM_METRIC:       'JVM metric (heap, GC, inflight)',
};

const SEVERITY_LABELS: Record<Severity, string> = {
  CRITICAL: 'Critical',
  WARNING:  'Warning',
  INFO:     'Info',
};

const ROUTE_METRIC_LABELS: Record<RouteMetric, string> = {
  ERROR_RATE:      'Error rate',
  P99_LATENCY_MS:  'P99 latency (ms)',
  AVG_DURATION_MS: 'Avg duration (ms)',
  THROUGHPUT:      'Throughput (msg/s)',
  ERROR_COUNT:     'Error count',
};

const COMPARATOR_LABELS: Record<Comparator, string> = {
  GT:  '>',
  GTE: '\u2265',
  LT:  '<',
  LTE: '\u2264',
  EQ:  '=',
};

const JVM_AGGREGATION_LABELS: Record<JvmAggregation, string> = {
  MAX:    'MAX',
  MIN:    'MIN',
  AVG:    'AVG',
  LATEST: 'LATEST',
};

const EXCHANGE_FIRE_MODE_LABELS: Record<ExchangeFireMode, string> = {
  PER_EXCHANGE:    'One alert per matching exchange',
  COUNT_IN_WINDOW: 'Threshold: N matches in window',
};

const TARGET_KIND_LABELS: Record<TargetKind, string> = {
  USER:  'User',
  GROUP: 'Group',
  ROLE:  'Role',
};

// ---------------------------------------------------------------------------
// Exported option arrays (in label-map declaration order).
// ---------------------------------------------------------------------------

export const CONDITION_KIND_OPTIONS:    Option<ConditionKind>[]    = toOptions(CONDITION_KIND_LABELS);
export const SEVERITY_OPTIONS:          Option<Severity>[]         = toOptions(SEVERITY_LABELS);
export const ROUTE_METRIC_OPTIONS:      Option<RouteMetric>[]      = toOptions(ROUTE_METRIC_LABELS);
export const COMPARATOR_OPTIONS:        Option<Comparator>[]       = toOptions(COMPARATOR_LABELS);
export const JVM_AGGREGATION_OPTIONS:   Option<JvmAggregation>[]   = toOptions(JVM_AGGREGATION_LABELS);
export const EXCHANGE_FIRE_MODE_OPTIONS:Option<ExchangeFireMode>[] = toOptions(EXCHANGE_FIRE_MODE_LABELS);
export const TARGET_KIND_OPTIONS:       Option<TargetKind>[]       = toOptions(TARGET_KIND_LABELS);