async function adminFetch<T>(path: string, init?: RequestInit): Promise<T> {
  const response = await fetch(path, {
    ...init,
    credentials: 'include',
    headers: {
      Accept: 'application/json',
      ...(init?.body ? { 'Content-Type': 'application/json' } : {}),
      ...(init?.headers ?? {}),
    },
  });
  const payload = (await response.json().catch(() => ({}))) as {
    data?: T;
    message?: string;
    error?: { code: string; message: string };
  };
  if (!response.ok) {
    throw new Error(payload?.error?.message ?? payload?.message ?? `请求失败 (${response.status})`);
  }
  return (payload.data !== undefined ? payload.data : payload) as T;
}

export type AdminUser = {
  id: string;
  username: string;
  slug: string;
  email: string;
  displayName: string;
  role: string;
  status: string;
  balanceCents: number;
  createdAt: string;
};

export type AdminSummary = {
  totalUsers: number;
  activeUsers: number;
  totalBalanceCents: number;
  llm?: {
    keyCount: number;
    selectedKeyName: string | null;
    globalModel: string | null;
  };
};

export type LedgerEntry = {
  id: string;
  userId: string;
  username?: string;
  type: string;
  amountCents: number;
  note: string;
  createdAt: string;
};

export type UsageRecord = {
  id: string;
  userId: string;
  username?: string;
  provider: string;
  model: string;
  inputTokens: number;
  outputTokens: number;
  costCents: number;
  createdAt: string;
};

export type WechatAdminSummary = {
  config: {
    mpEnabled: boolean;
    scheduleEnabled: boolean;
    reminderWorkerEnabled: boolean;
    appId: string | null;
    publicBaseUrl: string | null;
    bindPath: string | null;
    tokenEndpointConfigured: boolean;
    customerServiceEndpointConfigured: boolean;
  };
  counts: {
    boundUsers: number;
    routes: { total: number; active: number };
    recentMessages: Record<string, number>;
    digests: Record<string, number>;
    recentDeliveries: Record<string, number>;
  };
};

export type WechatBinding = {
  userId: string;
  username: string;
  displayName: string;
  status: string;
  appId: string | null;
  openidMasked: string;
  nickname: string | null;
  avatarUrl: string | null;
  lastLoginAt: number;
  boundAt: number;
  routeId: string | null;
  routeStatus: string | null;
  agentSessionId: string | null;
  routeUpdatedAt: number | null;
};

export type WechatMessage = {
  appId: string | null;
  openidMasked: string;
  msgId: string;
  status: string;
  agentSessionId: string | null;
  createdAt: number;
  updatedAt: number;
  userId: string | null;
  username: string | null;
  displayName: string | null;
};

export type WechatDigestSubscription = {
  id: string;
  userId: string;
  username: string;
  displayName: string;
  digestType: string;
  hour: number;
  minute: number;
  timezone: string;
  channel: string;
  status: string;
  nextRunAt: number;
  lastRunAt: number | null;
  attempts: number;
  lastError: string | null;
  sourceText: string | null;
  createdAt: number;
  updatedAt: number;
};

export type WechatDeliveryLog = {
  id: string;
  reminderId: string | null;
  subscriptionId: string | null;
  userId: string;
  username: string;
  displayName: string;
  channel: string;
  status: string;
  providerMessageId: string | null;
  errorCode: string | null;
  errorMessage: string | null;
  createdAt: number;
  digestType: string | null;
};

export type WechatWebNotification = {
  id: string;
  userId: string;
  username: string;
  displayName: string;
  channel: string;
  notificationType: string;
  title: string;
  body: string;
  status: string;
  readAt: number | null;
  createdAt: number;
  updatedAt: number;
};

export type CreateWechatNotificationPayload = {
  userId?: string;
  userIds?: string[];
  audience?: 'all';
  allUsers?: boolean;
  title: string;
  body: string;
  notificationType?: string;
  channel?: 'web' | 'wechat';
  channels?: Array<'web' | 'wechat'>;
};

export type SystemDisclosureMode = 'off' | 'shadow' | 'enforce';

export type SystemDisclosurePolicyConfig = {
  enabled: boolean;
  mode: SystemDisclosureMode;
  refusalText: string;
  productNames: string[];
  selfReferences: string[];
  categories: Record<string, boolean>;
};

export type SystemDisclosurePolicyState = {
  config: SystemDisclosurePolicyConfig;
  policyVersion: number;
  updatedBy: string | null;
  updatedAt: number | null;
  source: string;
  refreshedAt?: number | null;
  lastRefreshError?: string | null;
};

export type OrchestratorMode = 'off' | 'shadow' | 'canary' | 'active';

export type OrchestratorConfig = {
  mode: OrchestratorMode;
  primaryEngine: string;
  fallbackEngine: string;
  serviceUrl: string;
  requestTimeoutMs: number;
  rolloutPercent: number;
  userAllowlist: string[];
  workflowAllowlist: string[];
  fallbackToNative: boolean;
  requireHealthy: boolean;
};

export type OrchestratorRuntime = {
  killSwitch: boolean;
  configured: boolean;
  effective: boolean;
  reason: string | null;
  executesLangGraph: boolean;
  plansLangGraph: boolean;
  shadowsLangGraph: boolean;
  executionHandoff: {
    implemented: boolean;
    requested: boolean;
    enabled: boolean;
    reason: string | null;
  };
};

export type OrchestratorEngineDescriptor = {
  id: string;
  label: string;
  kind: string;
  configured: boolean;
  capabilities: string[];
};

export type OrchestratorExecutorDescriptor = {
  id: string;
  label: string;
  kind: string;
  enabled: boolean;
  dispatchImplemented: boolean;
  status: string;
  capabilities: string[];
};

export type OrchestratorConfigState = {
  config: OrchestratorConfig;
  configVersion: number;
  updatedBy: string | null;
  updatedAt: number | null;
  source: string;
  runtime: OrchestratorRuntime;
  engines: OrchestratorEngineDescriptor[];
  executors: OrchestratorExecutorDescriptor[];
};

export type OrchestratorServiceHealth = {
  checkedAt: number;
  ok: boolean;
  status: 'healthy' | 'unhealthy' | 'unconfigured' | 'timeout' | 'unreachable' | 'fetch_unavailable';
  latencyMs: number;
  httpStatus: number | null;
  details: {
    service: string | null;
    checkpoint: { kind?: string; durable?: boolean } | null;
    execution: string | null;
    executorGateway: {
      dispatchImplemented: boolean;
      executionEnabled: boolean;
      store: { kind: string | null; durable: boolean } | null;
    } | null;
  } | null;
};

export type OrchestratorRuntimeState = OrchestratorConfigState & {
  serviceHealth: OrchestratorServiceHealth;
};

export type OrchestratorShadowMetrics = {
  observations: number;
  successes: number;
  failures: number;
  successRate: number | null;
  failureRate: number | null;
  latencyP50Ms: number | null;
  latencyP95Ms: number | null;
  nativeSucceeded: number;
  nativeFailed: number;
  lastObservedAt: number | null;
  sampled: boolean;
};

export type OrchestratorShadowRun = {
  eventId: string;
  runId: string;
  requestId: string;
  userId: string;
  sessionId: string | null;
  nativeStatus: string;
  nativeAttempts: number;
  shadowStatus: 'succeeded' | 'failed';
  engine: string;
  configVersion: number | null;
  phase: string | null;
  taskType: string | null;
  synthetic: boolean;
  executorAdapter: string | null;
  latencyMs: number | null;
  error: { code: string; message: string } | null;
  observedAt: number;
  nativeCompletedAt: number | null;
};

export type OrchestratorShadowRunList = {
  generatedAt: number;
  window: { hours: number; from: number };
  metrics: OrchestratorShadowMetrics;
  runs: OrchestratorShadowRun[];
};

export type OrchestratorExecutionPlan = {
  eventId: string;
  runId: string;
  requestId: string;
  userId: string;
  sessionId: string | null;
  nativeStatus: string;
  nativeAttempts: number;
  mode: string | null;
  candidateEngine: string;
  effectiveEngine: string;
  fallbackEngine: string;
  reason: string | null;
  candidateReason: string | null;
  configVersion: number | null;
  bucket: number | null;
  taskType: string | null;
  dryRun: boolean;
  handoffAllowed: boolean;
  plannedAt: number;
  nativeCompletedAt: number | null;
};

export type OrchestratorExecutionPlanMetrics = {
  decisions: number;
  candidateSelections: number;
  candidateSelectionRate: number | null;
  nativeSelections: number;
  nativeSucceeded: number;
  nativeFailed: number;
  nativeSettledRate: number | null;
  handoffAllowed: number;
  distinctSessions: number;
  lastPlannedAt: number | null;
  candidateReasons: Array<{ value: string; count: number }>;
  taskTypes: Array<{ value: string; count: number }>;
  sampled: boolean;
};

export type OrchestratorExecutionPlanList = {
  generatedAt: number;
  window: { hours: number; from: number };
  metrics: OrchestratorExecutionPlanMetrics;
  plans: OrchestratorExecutionPlan[];
};

export type OrchestratorCanaryReadinessCheck = {
  id: string;
  passed: boolean;
  actual: string | number | boolean | null;
  target: string | number | boolean | null;
};

export type OrchestratorCanaryReadiness = {
  generatedAt: number;
  ready: boolean;
  recommendation: 'keep_shadow' | 'manual_canary_review';
  window: { hours: number; from: number };
  thresholds: {
    hours: number;
    minObservations: number;
    minSuccessRate: number;
    maxP95LatencyMs: number;
    minLatencyCoverageRate: number;
    minNativeSettledRate: number;
    minDistinctSessions: number;
    maxHoursSinceLastObservation: number;
  };
  samples: {
    totalObservations: number;
    eligibleObservations: number;
    excludedSynthetic: number;
    successes: number;
    failures: number;
    successRate: number | null;
    latencyCoverageRate: number | null;
    latencyP95Ms: number | null;
    nativeSettledRate: number | null;
    distinctSessions: number;
    lastObservedAt: number | null;
    hoursSinceLastObservation: number | null;
    sampled: boolean;
  };
  service: {
    status: string | null;
    latencyMs: number | null;
    checkpointKind: string | null;
    checkpointDurable: boolean | null;
    execution: string | null;
  };
  checks: OrchestratorCanaryReadinessCheck[];
  blockers: string[];
  failureCodes: Array<{ code: string; count: number }>;
};

export type OrchestratorShadowRunDetail = {
  native: {
    runId: string;
    requestId: string;
    userId: string;
    sessionId: string | null;
    status: string;
    attempts: number;
    error: string | null;
    createdAt: number;
    updatedAt: number;
    startedAt: number | null;
    completedAt: number | null;
  };
  localEvents: Array<{
    eventId: string;
    type: string;
    data: Record<string, unknown> | null;
    createdAt: number;
  }>;
  remote: {
    available: boolean;
    state: {
      status?: string;
      phase?: string;
      plan?: Record<string, unknown>;
      result?: Record<string, unknown>;
    } | null;
    events: Array<{
      sequence?: number;
      type?: string;
      timestamp?: number;
      data?: Record<string, unknown> | null;
    }>;
    error: { code: string; message: string } | null;
  };
};

// ─── Summary ──────────────────────────────────────────────────────────────────

export async function fetchAdminSummary() {
  return adminFetch<{ summary: AdminSummary }>('/admin-api/summary');
}

// ─── Trust & Policy ───────────────────────────────────────────────────────────

export async function fetchSystemDisclosurePolicy() {
  return adminFetch<SystemDisclosurePolicyState>('/admin-api/system-disclosure-policy/config');
}

export async function updateSystemDisclosurePolicy(config: SystemDisclosurePolicyConfig) {
  return adminFetch<SystemDisclosurePolicyState>('/admin-api/system-disclosure-policy/config', {
    method: 'PUT',
    body: JSON.stringify({ config }),
  });
}

// ─── Workflow Orchestrator ───────────────────────────────────────────────────

export async function fetchOrchestratorConfig() {
  return adminFetch<OrchestratorConfigState>('/admin-api/orchestrator/config');
}

export async function updateOrchestratorConfig(config: OrchestratorConfig) {
  return adminFetch<OrchestratorConfigState>('/admin-api/orchestrator/config', {
    method: 'PUT',
    body: JSON.stringify({ config }),
  });
}

export async function fetchOrchestratorRuntime() {
  return adminFetch<OrchestratorRuntimeState>('/admin-api/orchestrator/runtime');
}

export async function fetchOrchestratorShadowRuns(params: {
  hours?: number;
  limit?: number;
  status?: 'all' | 'succeeded' | 'failed';
} = {}) {
  const query = new URLSearchParams();
  if (params.hours) query.set('hours', String(params.hours));
  if (params.limit) query.set('limit', String(params.limit));
  if (params.status) query.set('status', params.status);
  return adminFetch<OrchestratorShadowRunList>(
    `/admin-api/orchestrator/shadow-runs?${query}`,
  );
}

export async function fetchOrchestratorExecutionPlans(params: {
  hours?: number;
  limit?: number;
  selection?: 'all' | 'candidate' | 'native';
} = {}) {
  const query = new URLSearchParams();
  if (params.hours) query.set('hours', String(params.hours));
  if (params.limit) query.set('limit', String(params.limit));
  if (params.selection) query.set('selection', params.selection);
  return adminFetch<OrchestratorExecutionPlanList>(
    `/admin-api/orchestrator/execution-plans?${query}`,
  );
}

export async function fetchOrchestratorCanaryReadiness() {
  return adminFetch<OrchestratorCanaryReadiness>(
    '/admin-api/orchestrator/canary-readiness',
  );
}

export async function fetchOrchestratorShadowRun(runId: string) {
  return adminFetch<OrchestratorShadowRunDetail>(
    `/admin-api/orchestrator/shadow-runs/${encodeURIComponent(runId)}`,
  );
}

// ─── Users ────────────────────────────────────────────────────────────────────

export async function fetchAdminUsers(params: {
  page?: number;
  pageSize?: number;
  search?: string;
  role?: string;
  status?: string;
}) {
  const q = new URLSearchParams();
  if (params.page) q.set('page', String(params.page));
  if (params.pageSize) q.set('pageSize', String(params.pageSize));
  if (params.search) q.set('search', params.search);
  if (params.role) q.set('role', params.role);
  if (params.status) q.set('status', params.status);
  return adminFetch<{ users: AdminUser[]; total: number; page: number; pageSize: number; totalPages: number }>(
    `/admin-api/users?${q}`,
  );
}

export async function createAdminUser(body: {
  username: string;
  password: string;
  displayName?: string;
  role?: string;
}) {
  return adminFetch<{ user: AdminUser }>('/admin-api/users', {
    method: 'POST',
    body: JSON.stringify(body),
  });
}

export async function patchAdminUser(
  userId: string,
  patch: { role?: string; status?: string; displayName?: string; password?: string },
) {
  return adminFetch<{ user: AdminUser }>(`/admin-api/users/${userId}`, {
    method: 'PATCH',
    body: JSON.stringify(patch),
  });
}

export async function rechargeUser(userId: string, amountCents: number, note = '') {
  return adminFetch<{ user: AdminUser }>(`/admin-api/users/${userId}/recharge`, {
    method: 'POST',
    body: JSON.stringify({ amountCents, note }),
  });
}

// ─── Billing ──────────────────────────────────────────────────────────────────

export async function fetchAdminLedger(params: { page?: number; pageSize?: number } = {}) {
  const q = new URLSearchParams();
  if (params.page) q.set('page', String(params.page));
  if (params.pageSize) q.set('pageSize', String(params.pageSize));
  return adminFetch<{ entries: LedgerEntry[]; total: number; page: number; totalPages: number }>(
    `/admin-api/ledger?${q}`,
  );
}

export async function fetchAdminUsage(params: { page?: number; pageSize?: number } = {}) {
  const q = new URLSearchParams();
  if (params.page) q.set('page', String(params.page));
  if (params.pageSize) q.set('pageSize', String(params.pageSize));
  return adminFetch<{ records: UsageRecord[]; total: number; page: number; totalPages: number }>(
    `/admin-api/usage?${q}`,
  );
}

// ─── WeChat MP ────────────────────────────────────────────────────────────────

export async function fetchWechatSummary() {
  return adminFetch<WechatAdminSummary>('/admin-api/wechat/summary');
}

export async function fetchWechatBindings(params: { search?: string; limit?: number } = {}) {
  const q = new URLSearchParams();
  if (params.search) q.set('search', params.search);
  if (params.limit) q.set('limit', String(params.limit));
  return adminFetch<{ bindings: WechatBinding[] }>(`/admin-api/wechat/bindings?${q}`);
}

export async function fetchWechatMessages(params: { status?: string; limit?: number } = {}) {
  const q = new URLSearchParams();
  if (params.status) q.set('status', params.status);
  if (params.limit) q.set('limit', String(params.limit));
  return adminFetch<{ messages: WechatMessage[] }>(`/admin-api/wechat/messages?${q}`);
}

export async function fetchWechatDigests(params: { status?: string; limit?: number } = {}) {
  const q = new URLSearchParams();
  if (params.status) q.set('status', params.status);
  if (params.limit) q.set('limit', String(params.limit));
  return adminFetch<{ digests: WechatDigestSubscription[] }>(`/admin-api/wechat/digests?${q}`);
}

export async function fetchWechatDeliveries(params: { status?: string; limit?: number } = {}) {
  const q = new URLSearchParams();
  if (params.status) q.set('status', params.status);
  if (params.limit) q.set('limit', String(params.limit));
  return adminFetch<{ deliveries: WechatDeliveryLog[] }>(`/admin-api/wechat/deliveries?${q}`);
}

export async function fetchWechatWebNotifications(params: { status?: string; limit?: number } = {}) {
  const q = new URLSearchParams();
  if (params.status) q.set('status', params.status);
  if (params.limit) q.set('limit', String(params.limit));
  return adminFetch<{ notifications: WechatWebNotification[] }>(
    `/admin-api/wechat/web-notifications?${q}`,
  );
}

export async function createWechatWebNotification(body: CreateWechatNotificationPayload) {
  return adminFetch<{
    ok: boolean;
    created: number;
    wechatSent: number;
    wechatFailures: Array<{ userId: string; message: string }>;
    targets: number;
  }>('/admin-api/wechat/web-notifications', {
    method: 'POST',
    body: JSON.stringify(body),
  });
}

export async function clearWechatRoute(userId: string) {
  return adminFetch<{ ok: boolean; deleted: number; openidMasked: string }>(
    `/admin-api/wechat/users/${userId}/route/clear`,
    { method: 'POST' },
  );
}

export async function cancelWechatDigest(id: string) {
  return adminFetch<{ ok: boolean }>(`/admin-api/wechat/digests/${id}/cancel`, { method: 'POST' });
}

export async function resumeWechatDigest(id: string) {
  return adminFetch<{ ok: boolean; nextRunAt: number }>(`/admin-api/wechat/digests/${id}/resume`, {
    method: 'POST',
  });
}