/**
 * useDataBus — Unified DataBus Hook
 * ==================================
 * Every data fetch in the frontend routes through this hook.
 * Calls POST /api/v1/databus/fetch with typed data_type + params.
 *
 * Usage:
 *   const { data, isLoading } = useDataBus('token_price', { mint: 'So111...' });
 *   const { data, isLoading } = useDataBus('wallet_tokens', { address: '0x...', network: 'eth-mainnet' });
 *   const { data, isLoading } = useDataBus('wallet_labels', { address: '0x...' });
 *   const { data, isLoading } = useDataBus('scanner', { address: '0x...', chain: 'solana' });
 *   const { data, isLoading } = useDataBus('rag_search', { query: 'honeypot patterns' });
 *   const { data, isLoading } = useDataBus('alerts', { limit: 20 });
 *   const { data, isLoading } = useDataBus('trending', { timeframe: '24h' });
 *   const { data, isLoading } = useDataBus('market_overview', {});
 *   const { data, isLoading } = useDataBus('holder_data', { mint: '0x...' });
 *   const { data, isLoading } = useDataBus('cross_chain', { address: '0x...' });
 *   const { data, isLoading } = useDataBus('tx_trace', { tx_hash: '0x...' });
 *
 * 14 chains available — see /api/v1/databus/chains for full list.
 */

import { useQuery } from '@tanstack/react-query';
import { api } from '../services/api';
import { useAppStore } from '../store/appStore';

type DataBusChain =
  | 'token_price'
  | 'market_overview'
  | 'trending'
  | 'alerts'
  | 'news'
  | 'wallet_labels'
  | 'wallet_tokens'
  | 'wallet_nfts'
  | 'token_metadata'
  | 'scanner'
  | 'rag_search'
  | 'holder_data'
  | 'cross_chain'
  | 'tx_trace';

interface DataBusParams {
  // Token
  mint?: string;
  token?: string;
  contract?: string;
  // Wallet
  address?: string;
  wallet?: string;
  // Chain / Network
  chain?: string;
  network?: string;
  // Search
  query?: string;
  collection?: string;
  // Pagination
  limit?: number;
  offset?: number;
  // Time
  timeframe?: string;
  // Transaction
  tx_hash?: string;
  // Misc
  [key: string]: any;
}

interface DataBusResult<T = any> {
  data_type: string;
  provider: string;
  cached: boolean;
  latency_ms: number;
  result: T;
  metadata?: {
    tier: string;
    credits_remaining?: number;
    rate_limit_remaining?: number;
  };
}

/**
 * Core DataBus hook — fetch any chain by type.
 * staleTime aligns with DataBus cache TTLs (price=5min, holders=1h, trace=24h).
 */
export function useDataBus<T = any>(
  dataType: DataBusChain | null,
  params: DataBusParams = {},
  options?: {
    enabled?: boolean;
    refetchInterval?: number;
    staleTime?: number;
    forceFresh?: boolean;
  }
) {
  const user = useAppStore((state) => state.user);
  const tier = user?.tier || 'FREE';

  return useQuery<DataBusResult<T>>({
    queryKey: ['databus', dataType, params],
    queryFn: async () => {
      if (!dataType) return null;
      const result = await api.databusFetch(dataType, {
        ...params,
        consumer_type: 'authenticated',
        x402_tier: tier,
        ...(options?.forceFresh ? { force_fresh: true } : {}),
      });
      return result;
    },
    enabled: !!dataType && (options?.enabled !== false),
    staleTime: options?.staleTime ?? getDefaultStaleTime(dataType),
    gcTime: 10 * 60 * 1000,
    refetchInterval: options?.refetchInterval,
  });
}

/** Smart defaults matching DataBus cache TTLs */
function getDefaultStaleTime(dataType: DataBusChain | null): number {
  switch (dataType) {
    case 'token_price':
    case 'market_overview':
    case 'trending':
      return 5 * 60 * 1000; // 5 min
    case 'holder_data':
    case 'wallet_tokens':
    case 'wallet_nfts':
    case 'token_metadata':
    case 'cross_chain':
      return 60 * 60 * 1000; // 1 hour
    case 'tx_trace':
      return 24 * 60 * 60 * 1000; // 24 hours
    case 'alerts':
    case 'news':
      return 60 * 1000; // 1 min
    default:
      return 2 * 60 * 1000; // 2 min
  }
}

/**
 * Convenience: fetch multiple chains at once.
 */
export function useDataBusBatch<T = any>(
  queries: Array<{ data_type: DataBusChain; params?: DataBusParams }>,
  options?: { enabled?: boolean; refetchInterval?: number }
) {
  const user = useAppStore((state) => state.user);
  const tier = user?.tier || 'FREE';

  return useQuery<DataBusResult<T>[]>({
    queryKey: ['databus', 'batch', queries],
    queryFn: async () => {
      const results = await api.databusBatch(
        queries.map((q) => ({
          data_type: q.data_type,
          params: { ...q.params, consumer_type: 'authenticated', x402_tier: tier },
        }))
      );
      return results;
    },
    enabled: options?.enabled !== false && queries.length > 0,
    staleTime: 60 * 1000,
    gcTime: 5 * 60 * 1000,
    refetchInterval: options?.refetchInterval,
  });
}

/**
 * Fetch available chains + their status.
 */
export function useDataBusChains() {
  return useQuery({
    queryKey: ['databus', 'chains'],
    queryFn: () => api.databusChains(),
    staleTime: 10 * 60 * 1000,
    gcTime: 30 * 60 * 1000,
  });
}

/**
 * Health + capacity check.
 */
export function useDataBusHealth() {
  return useQuery({
    queryKey: ['databus', 'health'],
    queryFn: () => api.databusHealth(),
    refetchInterval: 60000,
    staleTime: 30000,
  });
}