import { API_BASE } from '@/lib/api';
import { controlPlaneFetch, controlPlaneJson } from '@/lib/controlPlane';
import type { LegacyCompatibilitySnapshot } from '@/mesh/wormholeCompatibility';

export interface WormholeState {
  installed: boolean;
  configured: boolean;
  running: boolean;
  ready: boolean;
  transport_tier?: string;
  transport_configured: string;
  transport_active: string;
  arti_ready?: boolean;
  proxy_active: string;
  last_error: string;
  started_at: number;
  pid: number;
  privacy_level_effective: string;
  reason: string;
  last_restart: number;
  last_start: number;
  transport: string;
  proxy: string;
  anonymous_mode?: boolean;
  anonymous_mode_ready?: boolean;
  rns_enabled?: boolean;
  rns_ready?: boolean;
  rns_configured_peers?: number;
  rns_active_peers?: number;
  rns_private_dm_direct_ready?: boolean;
  recent_private_clearnet_fallback?: boolean;
  recent_private_clearnet_fallback_at?: number;
  recent_private_clearnet_fallback_reason?: string;
  clearnet_fallback_policy?: string;
  clearnet_fallback_requested?: string;
  private_delivery?: PrivateDeliverySummary;
  legacy_compatibility?: LegacyCompatibilitySnapshot;
}

export interface PrivateDeliveryApprovalAction {
  code: 'wait' | 'relay';
  label: string;
  emphasis: 'primary' | 'secondary' | '';
}

export interface PrivateDeliveryApprovalState {
  required?: boolean;
  reason_code?: string;
  started_at?: number;
  window_seconds?: number;
  status_label?: string;
  detail?: string;
  actions?: PrivateDeliveryApprovalAction[];
}

export interface PrivateDeliveryItem {
  id: string;
  lane: string;
  release_state: string;
  required_tier?: string;
  current_tier?: string;
  status?: {
    code?: string;
    label?: string;
    reason_code?: string;
    reason?: string;
  };
  approval?: PrivateDeliveryApprovalState;
}

export interface PrivateDeliverySummary {
  pending_count?: number;
  preparing_count?: number;
  queued_count?: number;
  approval_required_count?: number;
  current_tier?: string;
  items?: PrivateDeliveryItem[];
}

export interface PrivateDeliveryActionResponse {
  ok: boolean;
  action: 'wait' | 'relay';
  item?: PrivateDeliveryItem;
  detail?: string;
}

export interface WormholeSettingsSnapshot {
  enabled?: boolean;
  transport?: string;
  socks_proxy?: string;
  socks_dns?: boolean;
  anonymous_mode?: boolean;
  privacy_profile?: string;
}

export interface WormholeJoinResponse {
  ok: boolean;
  identity?: {
    node_id: string;
    public_key: string;
    public_key_algo: string;
  };
  runtime?: WormholeState;
  settings?: WormholeSettingsSnapshot;
}

const CACHE_TTL_MS = 15000;

let wormholeStateCache:
  | {
      value: WormholeState;
      expiresAt: number;
      inflight: Promise<WormholeState> | null;
    }
  | null = null;
let wormholeSettingsCache:
  | {
      value: WormholeSettingsSnapshot;
      expiresAt: number;
      inflight: Promise<WormholeSettingsSnapshot> | null;
    }
  | null = null;

async function parseState(res: Response): Promise<WormholeState> {
  if (!res.ok) {
    const data = await res.json().catch(() => ({}));
    throw new Error(data?.detail || data?.message || 'Wormhole request failed');
  }
  return (await res.json()) as WormholeState;
}

function resetWormholeCaches(): void {
  wormholeStateCache = null;
  wormholeSettingsCache = null;
}

async function loadWormholeState(): Promise<WormholeState> {
  const res = await fetch(`${API_BASE}/api/wormhole/status`, { cache: 'no-store' });
  return parseState(res);
}

async function loadWormholeSettings(): Promise<WormholeSettingsSnapshot> {
  const res = await fetch(`${API_BASE}/api/settings/wormhole`, { cache: 'no-store' });
  if (!res.ok) {
    const data = await res.json().catch(() => ({}));
    throw new Error(data?.detail || data?.message || 'Wormhole settings request failed');
  }
  return (await res.json()) as WormholeSettingsSnapshot;
}

export function invalidateWormholeRuntimeCache(): void {
  resetWormholeCaches();
}

export async function fetchWormholeState(force: boolean = false): Promise<WormholeState> {
  const now = Date.now();
  if (!force && wormholeStateCache?.value && wormholeStateCache.expiresAt > now) {
    return wormholeStateCache.value;
  }
  if (!force && wormholeStateCache?.inflight) {
    return wormholeStateCache.inflight;
  }
  const inflight = loadWormholeState()
    .then((value) => {
      wormholeStateCache = {
        value,
        expiresAt: Date.now() + CACHE_TTL_MS,
        inflight: null,
      };
      return value;
    })
    .catch((error) => {
      if (wormholeStateCache) wormholeStateCache.inflight = null;
      throw error;
    });
  wormholeStateCache = {
    value: wormholeStateCache?.value || ({} as WormholeState),
    expiresAt: 0,
    inflight,
  };
  return inflight;
}

export async function fetchWormholeSettings(
  force: boolean = false,
): Promise<WormholeSettingsSnapshot> {
  const now = Date.now();
  if (!force && wormholeSettingsCache?.value && wormholeSettingsCache.expiresAt > now) {
    return wormholeSettingsCache.value;
  }
  if (!force && wormholeSettingsCache?.inflight) {
    return wormholeSettingsCache.inflight;
  }
  const inflight = loadWormholeSettings()
    .then((value) => {
      wormholeSettingsCache = {
        value,
        expiresAt: Date.now() + CACHE_TTL_MS,
        inflight: null,
      };
      return value;
    })
    .catch((error) => {
      if (wormholeSettingsCache) wormholeSettingsCache.inflight = null;
      throw error;
    });
  wormholeSettingsCache = {
    value: wormholeSettingsCache?.value || {},
    expiresAt: 0,
    inflight,
  };
  return inflight;
}

export async function connectWormhole(
  options: { requireAdminSession?: boolean } = {},
): Promise<WormholeState> {
  resetWormholeCaches();
  const res = await controlPlaneFetch('/api/wormhole/connect', {
    method: 'POST',
    requireAdminSession: options.requireAdminSession,
  });
  const state = await parseState(res);
  wormholeStateCache = {
    value: state,
    expiresAt: Date.now() + CACHE_TTL_MS,
    inflight: null,
  };
  return state;
}

export async function updatePrivateDeliveryAction(
  itemId: string,
  action: 'wait' | 'relay',
): Promise<PrivateDeliveryActionResponse> {
  const response = await controlPlaneJson<PrivateDeliveryActionResponse>(
    `/api/wormhole/private-delivery/${encodeURIComponent(itemId)}/action`,
    {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ action }),
    },
  );
  invalidateWormholeRuntimeCache();
  return response;
}

export async function disconnectWormhole(): Promise<WormholeState> {
  resetWormholeCaches();
  const res = await controlPlaneFetch('/api/wormhole/disconnect', {
    method: 'POST',
  });
  const state = await parseState(res);
  wormholeStateCache = {
    value: state,
    expiresAt: Date.now() + CACHE_TTL_MS,
    inflight: null,
  };
  return state;
}

export async function restartWormhole(): Promise<WormholeState> {
  resetWormholeCaches();
  const res = await controlPlaneFetch('/api/wormhole/restart', {
    method: 'POST',
  });
  const state = await parseState(res);
  wormholeStateCache = {
    value: state,
    expiresAt: Date.now() + CACHE_TTL_MS,
    inflight: null,
  };
  return state;
}

export async function joinWormhole(): Promise<WormholeJoinResponse> {
  resetWormholeCaches();
  const res = await controlPlaneFetch('/api/wormhole/join', {
    method: 'POST',
    requireAdminSession: false,
  });
  if (!res.ok) {
    const data = await res.json().catch(() => ({}));
    throw new Error(data?.detail || data?.message || 'Wormhole join failed');
  }
  const data = (await res.json()) as WormholeJoinResponse;
  if (data?.runtime) {
    wormholeStateCache = {
      value: data.runtime,
      expiresAt: Date.now() + CACHE_TTL_MS,
      inflight: null,
    };
  }
  if (data?.settings) {
    wormholeSettingsCache = {
      value: data.settings,
      expiresAt: Date.now() + CACHE_TTL_MS,
      inflight: null,
    };
  }
  return data;
}

export async function leaveWormhole(): Promise<WormholeJoinResponse> {
  resetWormholeCaches();
  const res = await controlPlaneFetch('/api/wormhole/leave', {
    method: 'POST',
    requireAdminSession: false,
  });
  if (!res.ok) {
    const data = await res.json().catch(() => ({}));
    throw new Error(data?.detail || data?.message || 'Wormhole leave failed');
  }
  const data = (await res.json()) as WormholeJoinResponse;
  if (data?.runtime) {
    wormholeStateCache = {
      value: data.runtime,
      expiresAt: Date.now() + CACHE_TTL_MS,
      inflight: null,
    };
  }
  if (data?.settings) {
    wormholeSettingsCache = {
      value: data.settings,
      expiresAt: Date.now() + CACHE_TTL_MS,
      inflight: null,
    };
  }
  return data;
}