"use client"
import { useState, useEffect, useCallback, useMemo } from 'react';
import { toast } from 'sonner';

export type LogLevel = "DEBUG" | "INFO" | "WARNING" | "ERROR" | "CRITICAL";
export type LogStatus = "IN_PROGRESS" | "SUCCESS" | "FAILED";

export interface Log {
  id: number;
  level: LogLevel;
  status: LogStatus;
  message: string;
  source?: string;
  log_metadata?: Record<string, any>;
  created_at: string;
  search_space_id: number;
}

export interface LogFilters {
  search_space_id?: number;
  level?: LogLevel;
  status?: LogStatus;
  source?: string;
  start_date?: string;
  end_date?: string;
}

export interface LogSummary {
  total_logs: number;
  time_window_hours: number;
  by_status: Record<string, number>;
  by_level: Record<string, number>;
  by_source: Record<string, number>;
  active_tasks: Array<{
    id: number;
    task_name: string;
    message: string;
    started_at: string;
    source?: string;
  }>;
  recent_failures: Array<{
    id: number;
    task_name: string;
    message: string;
    failed_at: string;
    source?: string;
    error_details?: string;
  }>;
}

export function useLogs(searchSpaceId?: number, filters: LogFilters = {}) {
  const [logs, setLogs] = useState<Log[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  // Memoize filters to prevent infinite re-renders
  const memoizedFilters = useMemo(() => filters, [JSON.stringify(filters)]);

  const buildQueryParams = useCallback((customFilters: LogFilters = {}) => {
    const params = new URLSearchParams();
    
    const allFilters = { ...memoizedFilters, ...customFilters };
    
    if (allFilters.search_space_id) {
      params.append('search_space_id', allFilters.search_space_id.toString());
    }
    if (allFilters.level) {
      params.append('level', allFilters.level);
    }
    if (allFilters.status) {
      params.append('status', allFilters.status);
    }
    if (allFilters.source) {
      params.append('source', allFilters.source);
    }
    if (allFilters.start_date) {
      params.append('start_date', allFilters.start_date);
    }
    if (allFilters.end_date) {
      params.append('end_date', allFilters.end_date);
    }
    
    return params.toString();
  }, [memoizedFilters]);

  const fetchLogs = useCallback(async (customFilters: LogFilters = {}, options: { skip?: number; limit?: number } = {}) => {
    try {
      setLoading(true);
      
      const params = new URLSearchParams(buildQueryParams(customFilters));
      if (options.skip !== undefined) params.append('skip', options.skip.toString());
      if (options.limit !== undefined) params.append('limit', options.limit.toString());
      
      const response = await fetch(
        `${process.env.NEXT_PUBLIC_FASTAPI_BACKEND_URL}/api/v1/logs/?${params}`, 
        {
          headers: {
            Authorization: `Bearer ${localStorage.getItem('surfsense_bearer_token')}`,
          },
          method: "GET",
        }
      );
      
      if (!response.ok) {
        const errorData = await response.json().catch(() => ({}));
        throw new Error(errorData.detail || "Failed to fetch logs");
      }
      
      const data = await response.json();
      setLogs(data);
      setError(null);
      return data;
    } catch (err: any) {
      setError(err.message || 'Failed to fetch logs');
      console.error('Error fetching logs:', err);
      throw err;
    } finally {
      setLoading(false);
    }
  }, [buildQueryParams]);

  // Initial fetch
  useEffect(() => {
    const initialFilters = searchSpaceId ? { ...memoizedFilters, search_space_id: searchSpaceId } : memoizedFilters;
    fetchLogs(initialFilters);
  }, [searchSpaceId, fetchLogs, memoizedFilters]);

  // Function to refresh the logs list
  const refreshLogs = useCallback(async (customFilters: LogFilters = {}) => {
    const finalFilters = searchSpaceId ? { ...customFilters, search_space_id: searchSpaceId } : customFilters;
    return await fetchLogs(finalFilters);
  }, [searchSpaceId, fetchLogs]);

  // Function to create a new log
  const createLog = useCallback(async (logData: Omit<Log, 'id' | 'created_at'>) => {
    try {
      const response = await fetch(
        `${process.env.NEXT_PUBLIC_FASTAPI_BACKEND_URL}/api/v1/logs/`,
        {
          headers: {
            'Content-Type': 'application/json',
            Authorization: `Bearer ${localStorage.getItem('surfsense_bearer_token')}`,
          },
          method: "POST",
          body: JSON.stringify(logData),
        }
      );

      if (!response.ok) {
        const errorData = await response.json().catch(() => ({}));
        throw new Error(errorData.detail || "Failed to create log");
      }

      const newLog = await response.json();
      setLogs(prevLogs => [newLog, ...prevLogs]);
      toast.success("Log created successfully");
      return newLog;
    } catch (err: any) {
      toast.error(err.message || 'Failed to create log');
      console.error('Error creating log:', err);
      throw err;
    }
  }, []);

  // Function to update a log
  const updateLog = useCallback(async (logId: number, updateData: Partial<Omit<Log, 'id' | 'created_at' | 'search_space_id'>>) => {
    try {
      const response = await fetch(
        `${process.env.NEXT_PUBLIC_FASTAPI_BACKEND_URL}/api/v1/logs/${logId}`,
        {
          headers: {
            'Content-Type': 'application/json',
            Authorization: `Bearer ${localStorage.getItem('surfsense_bearer_token')}`,
          },
          method: "PUT",
          body: JSON.stringify(updateData),
        }
      );

      if (!response.ok) {
        const errorData = await response.json().catch(() => ({}));
        throw new Error(errorData.detail || "Failed to update log");
      }

      const updatedLog = await response.json();
      setLogs(prevLogs => 
        prevLogs.map(log => log.id === logId ? updatedLog : log)
      );
      toast.success("Log updated successfully");
      return updatedLog;
    } catch (err: any) {
      toast.error(err.message || 'Failed to update log');
      console.error('Error updating log:', err);
      throw err;
    }
  }, []);

  // Function to delete a log
  const deleteLog = useCallback(async (logId: number) => {
    try {
      const response = await fetch(
        `${process.env.NEXT_PUBLIC_FASTAPI_BACKEND_URL}/api/v1/logs/${logId}`,
        {
          headers: {
            Authorization: `Bearer ${localStorage.getItem('surfsense_bearer_token')}`,
          },
          method: "DELETE",
        }
      );

      if (!response.ok) {
        const errorData = await response.json().catch(() => ({}));
        throw new Error(errorData.detail || "Failed to delete log");
      }

      setLogs(prevLogs => prevLogs.filter(log => log.id !== logId));
      toast.success("Log deleted successfully");
      return true;
    } catch (err: any) {
      toast.error(err.message || 'Failed to delete log');
      console.error('Error deleting log:', err);
      return false;
    }
  }, []);

  // Function to get a single log
  const getLog = useCallback(async (logId: number) => {
    try {
      const response = await fetch(
        `${process.env.NEXT_PUBLIC_FASTAPI_BACKEND_URL}/api/v1/logs/${logId}`,
        {
          headers: {
            Authorization: `Bearer ${localStorage.getItem('surfsense_bearer_token')}`,
          },
          method: "GET",
        }
      );

      if (!response.ok) {
        const errorData = await response.json().catch(() => ({}));
        throw new Error(errorData.detail || "Failed to fetch log");
      }

      return await response.json();
    } catch (err: any) {
      toast.error(err.message || 'Failed to fetch log');
      console.error('Error fetching log:', err);
      throw err;
    }
  }, []);

  return { 
    logs, 
    loading, 
    error, 
    refreshLogs, 
    createLog, 
    updateLog, 
    deleteLog, 
    getLog,
    fetchLogs
  };
}

// Separate hook for log summary
export function useLogsSummary(searchSpaceId: number, hours: number = 24) {
  const [summary, setSummary] = useState<LogSummary | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  const fetchSummary = useCallback(async () => {
    if (!searchSpaceId) return;
    
    try {
      setLoading(true);
      const response = await fetch(
        `${process.env.NEXT_PUBLIC_FASTAPI_BACKEND_URL}/api/v1/logs/search-space/${searchSpaceId}/summary?hours=${hours}`,
        {
          headers: {
            Authorization: `Bearer ${localStorage.getItem('surfsense_bearer_token')}`,
          },
          method: "GET",
        }
      );

      if (!response.ok) {
        const errorData = await response.json().catch(() => ({}));
        throw new Error(errorData.detail || "Failed to fetch logs summary");
      }

      const data = await response.json();
      setSummary(data);
      setError(null);
      return data;
    } catch (err: any) {
      setError(err.message || 'Failed to fetch logs summary');
      console.error('Error fetching logs summary:', err);
      throw err;
    } finally {
      setLoading(false);
    }
  }, [searchSpaceId, hours]);

  useEffect(() => {
    fetchSummary();
  }, [fetchSummary]);

  const refreshSummary = useCallback(() => {
    return fetchSummary();
  }, [fetchSummary]);

  return { summary, loading, error, refreshSummary };
}