/**
 * useBackendData - Hook for fetching real data from backend endpoints
 * Provides auto-refresh and caching capabilities
 */

import { useState, useEffect, useCallback } from 'react';
import { API_URL } from '@/config/api';

export interface BackendDataOptions {
  endpoint: string;
  refreshInterval?: number; // ms, 0 = no auto-refresh
  enabled?: boolean;
}

export interface BackendDataResult<T> {
  data: T | null;
  isLoading: boolean;
  error: Error | null;
  refresh: () => Promise<void>;
  lastUpdated: Date | null;
}

export function useBackendData<T = unknown>(
  options: BackendDataOptions
): BackendDataResult<T> {
  const { endpoint, refreshInterval = 30000, enabled = true } = options;
  const [data, setData] = useState<T | null>(null);
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState<Error | null>(null);
  const [lastUpdated, setLastUpdated] = useState<Date | null>(null);

  const fetchData = useCallback(async () => {
    if (!enabled) return;

    setIsLoading(true);
    setError(null);

    try {
      const response = await fetch(`${API_URL}${endpoint}`);
      if (!response.ok) {
        throw new Error(`HTTP ${response.status}: ${response.statusText}`);
      }
      const result = await response.json();
      setData(result);
      setLastUpdated(new Date());
    } catch (err) {
      setError(err instanceof Error ? err : new Error(String(err)));
    } finally {
      setIsLoading(false);
    }
  }, [endpoint, enabled]);

  useEffect(() => {
    fetchData();

    if (refreshInterval > 0 && enabled) {
      const interval = setInterval(fetchData, refreshInterval);
      return () => clearInterval(interval);
    }
  }, [fetchData, refreshInterval, enabled]);

  return {
    data,
    isLoading,
    error,
    refresh: fetchData,
    lastUpdated
  };
}

// Specific hooks for common data types

export interface HealthData {
  status: string;
  timestamp: string;
  services: Record<string, { healthy: boolean; latency?: number }>;
}

export function useHealthData(refreshInterval = 10000) {
  return useBackendData<HealthData>({
    endpoint: '/health',
    refreshInterval
  });
}

export interface GraphStats {
  nodes: number;
  relationships: number;
  labels: string[];
}

export function useGraphStats(refreshInterval = 30000) {
  return useBackendData<GraphStats>({
    endpoint: '/api/graph/stats',
    refreshInterval
  });
}

export interface MCPTool {
  name: string;
  description: string;
  inputSchema: Record<string, unknown>;
}

export function useMCPTools(refreshInterval = 60000) {
  return useBackendData<{ tools: MCPTool[] }>({
    endpoint: '/api/mcp/tools',
    refreshInterval
  });
}

export interface HyperEvent {
  id: string;
  timestamp: string;
  level: string;
  category: string;
  message: string;
  data?: Record<string, unknown>;
}

export function useHyperEvents(limit = 50, refreshInterval = 5000) {
  return useBackendData<HyperEvent[]>({
    endpoint: `/api/hyper/events?limit=${limit}`,
    refreshInterval
  });
}

export interface HealingStatus {
  healthy: boolean;
  services: Record<string, boolean>;
  lastCheck: string;
}

export function useHealingStatus(refreshInterval = 15000) {
  return useBackendData<HealingStatus>({
    endpoint: '/api/healing/status',
    refreshInterval
  });
}

export interface KnowledgeStats {
  totalPatterns: number;
  categories: Record<string, number>;
  sources: Record<string, number>;
}

export function useKnowledgeStats(refreshInterval = 60000) {
  return useBackendData<KnowledgeStats>({
    endpoint: '/api/healing/knowledge/stats',
    refreshInterval
  });
}

export interface IngestionStatus {
  running: boolean;
  lastRun: string;
  stats: Record<string, number>;
}

export function useIngestionStatus(refreshInterval = 30000) {
  return useBackendData<IngestionStatus>({
    endpoint: '/api/ingestion/status',
    refreshInterval
  });
}

export default useBackendData;