import { useQuery } from '@tanstack/react-query';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Badge } from '@/components/ui/badge';
import { Loader2, Clock } from 'lucide-react';
import { format } from 'date-fns';
import { supabase } from '@/lib/supabaseClient';

interface CorrelatedLogsViewProps {
  requestId: string;
  traceId?: string;
}

interface TimelineEvent {
  timestamp: Date;
  type: 'error' | 'edge' | 'database' | 'approval';
  message: string;
  severity?: string;
  metadata?: Record<string, any>;
}

export function CorrelatedLogsView({ requestId, traceId }: CorrelatedLogsViewProps) {
  const { data: events, isLoading } = useQuery({
    queryKey: ['correlated-logs', requestId, traceId],
    queryFn: async () => {
      const events: TimelineEvent[] = [];

      // Fetch application error
      const { data: error } = await supabase
        .from('request_metadata')
        .select('*')
        .eq('request_id', requestId)
        .single();

      if (error) {
        events.push({
          timestamp: new Date(error.created_at),
          type: 'error',
          message: error.error_message || 'Unknown error',
          severity: error.error_type || undefined,
          metadata: {
            endpoint: error.endpoint,
            method: error.method,
            status_code: error.status_code,
          },
        });
      }

      // Fetch approval metrics
      const { data: approval } = await supabase
        .from('approval_transaction_metrics')
        .select('*')
        .eq('request_id', requestId)
        .maybeSingle();

      if (approval && approval.created_at) {
        events.push({
          timestamp: new Date(approval.created_at),
          type: 'approval',
          message: approval.success ? 'Approval successful' : (approval.error_message || 'Approval failed'),
          severity: approval.success ? 'success' : 'error',
          metadata: {
            items_count: approval.items_count,
            duration_ms: approval.duration_ms || undefined,
          },
        });
      }

      // TODO: Fetch edge function logs (requires Management API access)
      // TODO: Fetch database logs (requires analytics API access)

      // Sort chronologically
      events.sort((a, b) => a.timestamp.getTime() - b.timestamp.getTime());

      return events;
    },
  });

  const getTypeColor = (type: string): "default" | "destructive" | "outline" | "secondary" => {
    switch (type) {
      case 'error': return 'destructive';
      case 'approval': return 'destructive';
      case 'edge': return 'default';
      case 'database': return 'secondary';
      default: return 'outline';
    }
  };

  if (isLoading) {
    return (
      <div className="flex items-center justify-center py-12">
        <Loader2 className="w-6 h-6 animate-spin text-muted-foreground" />
      </div>
    );
  }

  if (!events || events.length === 0) {
    return (
      <Card>
        <CardContent className="pt-6">
          <p className="text-center text-muted-foreground">
            No correlated logs found for this request.
          </p>
        </CardContent>
      </Card>
    );
  }

  return (
    <Card>
      <CardHeader>
        <CardTitle className="text-lg flex items-center gap-2">
          <Clock className="w-5 h-5" />
          Timeline for Request {requestId.slice(0, 8)}
        </CardTitle>
      </CardHeader>
      <CardContent>
        <div className="relative space-y-4">
          {/* Timeline line */}
          <div className="absolute left-6 top-0 bottom-0 w-0.5 bg-border" />

          {events.map((event, index) => (
            <div key={index} className="relative pl-14">
              {/* Timeline dot */}
              <div className="absolute left-[18px] top-2 w-4 h-4 rounded-full bg-background border-2 border-primary" />

              <Card>
                <CardContent className="pt-4">
                  <div className="space-y-2">
                    <div className="flex items-center gap-2">
                      <Badge variant={getTypeColor(event.type)}>
                        {event.type.toUpperCase()}
                      </Badge>
                      {event.severity && (
                        <Badge variant="outline" className="text-xs">
                          {event.severity}
                        </Badge>
                      )}
                      <span className="text-xs text-muted-foreground">
                        {format(event.timestamp, 'HH:mm:ss.SSS')}
                      </span>
                    </div>
                    <p className="text-sm">{event.message}</p>
                    {event.metadata && Object.keys(event.metadata).length > 0 && (
                      <div className="text-xs text-muted-foreground space-y-1">
                        {Object.entries(event.metadata).map(([key, value]) => (
                          <div key={key}>
                            <span className="font-medium">{key}:</span> {String(value)}
                          </div>
                        ))}
                      </div>
                    )}
                  </div>
                </CardContent>
              </Card>
            </div>
          ))}
        </div>
      </CardContent>
    </Card>
  );
}