/**
 * Pipeline Health Alerts Component
 * 
 * Displays critical pipeline alerts on the admin error monitoring dashboard.
 * Shows top 10 active alerts with severity-based styling and resolution actions.
 */

import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
import { useSystemAlerts } from '@/hooks/useSystemHealth';
import { Badge } from '@/components/ui/badge';
import { Button } from '@/components/ui/button';
import { AlertTriangle, CheckCircle, XCircle, AlertCircle } from 'lucide-react';
import { format } from 'date-fns';
import { supabase } from '@/lib/supabaseClient';
import { toast } from 'sonner';

const SEVERITY_CONFIG = {
  critical: { color: 'destructive', icon: XCircle },
  high: { color: 'destructive', icon: AlertCircle },
  medium: { color: 'default', icon: AlertTriangle },
  low: { color: 'secondary', icon: CheckCircle },
} as const;

const ALERT_TYPE_LABELS: Record<string, string> = {
  failed_submissions: 'Failed Submissions',
  high_ban_rate: 'High Ban Attempt Rate',
  temp_ref_error: 'Temp Reference Error',
  orphaned_images: 'Orphaned Images',
  slow_approval: 'Slow Approvals',
  submission_queue_backlog: 'Queue Backlog',
  ban_attempt: 'Ban Attempt',
  upload_timeout: 'Upload Timeout',
  high_error_rate: 'High Error Rate',
  validation_error: 'Validation Error',
  stale_submissions: 'Stale Submissions',
  circular_dependency: 'Circular Dependency',
  rate_limit_violation: 'Rate Limit Violation',
};

export function PipelineHealthAlerts() {
  const { data: criticalAlerts } = useSystemAlerts('critical');
  const { data: highAlerts } = useSystemAlerts('high');
  const { data: mediumAlerts } = useSystemAlerts('medium');

  const allAlerts = [
    ...(criticalAlerts || []),
    ...(highAlerts || []),
    ...(mediumAlerts || [])
  ].slice(0, 10);

  const resolveAlert = async (alertId: string) => {
    const { error } = await supabase
      .from('system_alerts')
      .update({ resolved_at: new Date().toISOString() })
      .eq('id', alertId);

    if (error) {
      toast.error('Failed to resolve alert');
    } else {
      toast.success('Alert resolved');
    }
  };

  if (!allAlerts.length) {
    return (
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <CheckCircle className="w-5 h-5 text-green-500" />
            Pipeline Health: All Systems Operational
          </CardTitle>
        </CardHeader>
        <CardContent>
          <p className="text-sm text-muted-foreground">No active alerts. The sacred pipeline is flowing smoothly.</p>
        </CardContent>
      </Card>
    );
  }

  return (
    <Card>
      <CardHeader>
        <CardTitle>🚨 Active Pipeline Alerts</CardTitle>
        <CardDescription>
          Critical issues requiring attention ({allAlerts.length} active)
        </CardDescription>
      </CardHeader>
      <CardContent className="space-y-3">
        {allAlerts.map((alert) => {
          const config = SEVERITY_CONFIG[alert.severity];
          const Icon = config.icon;
          const label = ALERT_TYPE_LABELS[alert.alert_type] || alert.alert_type;

          return (
            <div
              key={alert.id}
              className="flex items-start justify-between p-3 border rounded-lg hover:bg-accent transition-colors"
            >
              <div className="flex items-start gap-3 flex-1">
                <Icon className="w-5 h-5 mt-0.5 flex-shrink-0" />
                <div className="flex-1 min-w-0">
                  <div className="flex items-center gap-2 mb-1">
                    <Badge variant={config.color as any}>{alert.severity.toUpperCase()}</Badge>
                    <span className="text-sm font-medium">{label}</span>
                  </div>
                  <p className="text-sm text-muted-foreground">{alert.message}</p>
                  <p className="text-xs text-muted-foreground mt-1">
                    {format(new Date(alert.created_at), 'PPp')}
                  </p>
                </div>
              </div>
              <Button
                variant="outline"
                size="sm"
                onClick={() => resolveAlert(alert.id)}
              >
                Resolve
              </Button>
            </div>
          );
        })}
      </CardContent>
    </Card>
  );
}